Home › MX204 Universal Routing Platform Hardware Guide

MX204 Universal Routing Platform Hardware Guide

File info: application/pdf · 197 pages · 4.61MB

MX204 Universal Routing Platform Hardware Guide - Juniper ...

Using the Examples in This Manual | x. Merging a Full Example | xi. Merging a Snippet | xii. ation Conventions | xii. ation ...

If you want to use the examples in this manual, you can use the load ... 1. From the HTML or PDF version of the manual, copy a configuration example into a text file, save the file...

Original Document

If the viewer doesn’t load, open the PDF directly.

Extracted Text

MX204 Universal Routing Platform Hardware Guide
Published
2020-11-11

ii
Juniper Networks, Inc. 1133 Innovation Way Sunnyvale, California 94089 USA 408-745-2000 www.juniper.net
Juniper Networks, the Juniper Networks logo, Juniper, and Junos are registered trademarks of Juniper Networks, Inc. in the United States and other countries. All other trademarks, service marks, registered marks, or registered service marks are the property of their respective owners.
Juniper Networks assumes no responsibility for any inaccuracies in this document. Juniper Networks reserves the right to change, modify, transfer, or otherwise revise this publication without notice.
MX204 Universal Routing Platform Hardware Guide Copyright � 2020 Juniper Networks, Inc. All rights reserved.
The information in this document is current as of the date on the title page.
YEAR 2000 NOTICE
Juniper Networks hardware and software products are Year 2000 compliant. Junos OS has no known time-related limitations through the year 2038. However, the NTP application is known to have some difficulty in the year 2036.
END USER LICENSE AGREEMENT
The Juniper Networks product that is the subject of this technical documentation consists of (or is intended for use with) Juniper Networks software. Use of such software is subject to the terms and conditions of the End User License Agreement ("EULA") posted at https://support.juniper.net/support/eula/. By downloading, installing or using such software, you agree to the terms and conditions of that EULA.

iii

Table of Contents

Overview

MX204 Router Overview | 18

Benefits of MX204 Router | 18

System Overview | 19

Site Planning, Preparation, and Specifications

MX204 Site Preparation Checklist | 50

v
Grounding Cable Specifications | 55 MX204 Router Cabinet Requirements and Specifications | 55 MX204 Router Clearance Requirements for Airflow and Hardware Maintenance | 57 MX204 Router Rack Requirements | 58
MX204 Network Cable and Transceiver Planning | 60 Calculating Power Budget and Power Margin for Fiber-Optic Cables | 60 How to Calculate Power Budget for Fiber-Optic Cable | 60 How to Calculate Power Margin for Fiber-Optic Cable | 61 CB-RE and RCB Interface Cable and Wire Specifications for MX Series Routers | 62 Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion | 63 Signal Loss in Multimode and Single-Mode Fiber-Optic Cable | 63 Attenuation and Dispersion in Fiber-Optic Cable | 64
MX204 Management and Console Port Specifications and Pinouts | 65 RJ-45 Connector Pinouts for MX Series CB-RE or RCB Auxillary and Console Ports | 65 RJ-45 Connector Pinouts for an MX Series CB-RE or RCB Management Port | 66
MX204 Power Planning | 67 Power Consumption for an AC-Powered MX204 Router | 67 Power Requirements for MX204 Components | 67 Calculating System Thermal Output | 68 Power Consumption for a DC-Powered MX204 Router | 69 Power Requirements for MX204 Components | 69 Calculating System Thermal Output | 70

Initial Installation and Configuration

MX204 Installation Overview | 72

Unpacking the MX204 | 73 Tools and Parts Required to Unpack the MX204 Router | 73 Unpacking MX204 Router | 74 Verifying the MX204 Router Parts Received | 75

Connecting the MX204 to the Network | 96 Tools and Parts Required to Connect the MX204 Router to External Devices | 96 Connecting the MX204 Router to External Devices and Cables | 96 Connecting the Router to a Network for Out-of-Band Management | 97 Connecting the Router to a Console Device | 98 Connecting the Router to External Clocking and Timing Devices | 100

Performing the Initial Software Configuration for the MX204 Router | 103

vii

Maintaining Components

Maintaining MX204 Components | 109

Routine Maintenance Procedures for MX204 Routers | 109

Maintaining the MX204 Routing Engine | 109

Replace an SFP, SFP+, or QSFP+ Transceiver | 111

Remove a Transceiver | 111

Install a Transceiver | 113

Replace a QSFP28 Transceiver | 115

Remove a QSFP28 Transceiver | 116

Install a QSFP28 Transceiver | 117

Contacting Customer Support and Returning the Chassis or Components

Contacting Customer Support and Returning the Chassis or Components | 134

Contacting Customer Support | 134

Contact Customer Support to Obtain Return Material Authorization | 135

Locating the Serial Number on an MX204 Router or Component | 136

Listing the Chassis and Component Details Using the CLI | 136

Locating the Chassis Serial Number ID Label on an MX204 | 137

Locating the Serial Number ID Labels on MX204 Power Supplies | 137

viii

Locating the Serial Number ID Label on an MX204 Fan Module | 138 Guidelines for Packing Hardware Components for Shipment | 139

Safety and Compliance Information

Definitions of Safety Warning Levels | 142

General Safety Guidelines and Warnings | 145

General Safety Warnings for Juniper Networks Devices | 146 Qualified Personnel Warning | 147 Restricted-Access Area Warning | 148

Fire Safety Requirements | 150 Fire Suppression | 150 Fire Suppression Equipment | 151

Installation Instructions Warning | 152

Chassis and Component Lifting Guidelines | 152

Ramp Warning | 153

Rack-Mounting and Cabinet-Mounting Warnings | 153

Radiation from Open Port Apertures Warning | 163

General Electrical Safety Guidelines and Warnings | 172

x
About the Documentation
IN THIS SECTION Documentation and Release Notes | x Using the Examples in This Manual | x Documentation Conventions | xii Documentation Feedback | xv Requesting Technical Support | xv
Use this guide to install hardware and perform initial software configuration, routine maintenance, and troubleshooting for the MX204 Universal Routing Platform. After completing the installation and basic configuration procedures covered in this guide, refer to the Junos OS documentation for information about further software configuration.
Documentation and Release Notes
To obtain the most current version of all Juniper Networks� technical documentation, see the product documentation page on the Juniper Networks website at https://www.juniper.net/documentation/. If the information in the latest release notes differs from the information in the documentation, follow the product Release Notes. Juniper Networks Books publishes books by Juniper Networks engineers and subject matter experts. These books go beyond the technical documentation to explore the nuances of network architecture, deployment, and administration. The current list can be viewed at https://www.juniper.net/books.
Using the Examples in This Manual
If you want to use the examples in this manual, you can use the load merge or the load merge relative command. These commands cause the software to merge the incoming configuration into the current candidate configuration. The example does not become active until you commit the candidate configuration.

xi
If the example configuration contains the top level of the hierarchy (or multiple hierarchies), the example is a full example. In this case, use the load merge command.
If the example configuration does not start at the top level of the hierarchy, the example is a snippet. In this case, use the load merge relative command. These procedures are described in the following sections.
Merging a Full Example
To merge a full example, follow these steps:
1. From the HTML or PDF version of the manual, copy a configuration example into a text file, save the file with a name, and copy the file to a directory on your routing platform. For example, copy the following configuration to a file and name the file ex-script.conf. Copy the ex-script.conf file to the /var/tmp directory on your routing platform.
system { scripts { commit { file ex-script.xsl; } }
} interfaces {
fxp0 { disable; unit 0 { family inet { address 10.0.0.1/24; } }
} }
2. Merge the contents of the file into your routing platform configuration by issuing the load merge configuration mode command:
[edit] user@host# load merge /var/tmp/ex-script.conf load complete

xii
Merging a Snippet To merge a snippet, follow these steps: 1. From the HTML or PDF version of the manual, copy a configuration snippet into a text file, save the
file with a name, and copy the file to a directory on your routing platform. For example, copy the following snippet to a file and name the file ex-script-snippet.conf. Copy the ex-script-snippet.conf file to the /var/tmp directory on your routing platform.
commit { file ex-script-snippet.xsl; }
2. Move to the hierarchy level that is relevant for this snippet by issuing the following configuration mode command:
[edit] user@host# edit system scripts [edit system scripts]
3. Merge the contents of the file into your routing platform configuration by issuing the load merge relative configuration mode command:
[edit system scripts] user@host# load merge relative /var/tmp/ex-script-snippet.conf load complete
For more information about the load command, see CLI Explorer.
Documentation Conventions
Table 1 on page xiii defines notice icons used in this guide.

Table 1: Notice Icons

Icon

Meaning

Informational note

Caution

Warning

xiii
Description Indicates important features or instructions.
Indicates a situation that might result in loss of data or hardware damage. Alerts you to the risk of personal injury or death.

Laser warning

Alerts you to the risk of personal injury from a laser.

Tip Best practice

Indicates helpful information. Alerts you to a recommended use or implementation.

Table 2 on page xiii defines the text and syntax conventions used in this guide.

Table 2: Text and Syntax Conventions

Convention

Description

Examples

Bold text like this

Represents text that you type.

To enter configuration mode, type the configure command:
user@host> configure

Fixed-width text like this

Represents output that appears on the terminal screen.

user@host> show chassis alarms No alarms currently active

Italic text like this

� Introduces or emphasizes important new terms.
� Identifies guide names. � Identifies RFC and Internet draft
titles.

� A policy term is a named structure that defines match conditions and actions.
� Junos OS CLI User Guide � RFC 1997, BGP Communities
Attribute

xiv

Table 2: Text and Syntax Conventions (continued)

Convention

Description

Examples

Italic text like this Text like this < > (angle brackets)

Represents variables (options for which you substitute a value) in commands or configuration statements.

Configure the machine's domain name:
[edit] root@# set system domain-name
domain-name

Represents names of configuration statements, commands, files, and directories; configuration hierarchy levels; or labels on routing platform components.
Encloses optional keywords or variables.

� To configure a stub area, include the stub statement at the [edit protocols ospf area area-id] hierarchy level.
� The console port is labeled CONSOLE.
stub <default-metric metric>;

| (pipe symbol)

Indicates a choice between the mutually exclusive keywords or variables on either side of the symbol. The set of choices is often enclosed in parentheses for clarity.

broadcast | multicast (string1 | string2 | string3)

# (pound sign)

Indicates a comment specified on the same line as the configuration statement to which it applies.

rsvp { # Required for dynamic MPLS only

[ ] (square brackets)

Encloses a variable for which you can community name members [

substitute one or more values.

community-ids ]

Indention and braces ( { } ) ; (semicolon)
GUI Conventions

Identifies a level in the configuration hierarchy.
Identifies a leaf statement at a configuration hierarchy level.

[edit] routing-options {
static { route default { nexthop address; retain; }
} }

Table 2: Text and Syntax Conventions (continued)

Convention

Description

Examples

Bold text like this > (bold right angle bracket)

Represents graphical user interface (GUI) items you click or select.
Separates levels in a hierarchy of menu selections.

� In the Logical Interfaces box, select All Interfaces.
� To cancel the configuration, click Cancel.
In the configuration editor hierarchy, select Protocols>Ospf.

Documentation Feedback
We encourage you to provide feedback so that we can improve our documentation. You can use either of the following methods: � Online feedback system--Click TechLibrary Feedback, on the lower right of any page on the Juniper
Networks TechLibrary site, and do one of the following:

� Click the thumbs-up icon if the information on the page was helpful to you. � Click the thumbs-down icon if the information on the page was not helpful to you or if you have
suggestions for improvement, and use the pop-up form to provide feedback. � E-mail--Send your comments to techpubs-comments@juniper.net. Include the document or topic name,
URL or page number, and software version (if applicable).
Requesting Technical Support
Technical product support is available through the Juniper Networks Technical Assistance Center (JTAC). If you are a customer with an active Juniper Care or Partner Support Services support contract, or are

xvi
covered under warranty, and need post-sales technical support, you can access our tools and resources online or open a case with JTAC. � JTAC policies--For a complete understanding of our JTAC procedures and policies, review the JTAC User
Guide located at https://www.juniper.net/us/en/local/pdf/resource-guides/7100059-en.pdf. � Product warranties--For product warranty information, visit https://www.juniper.net/support/warranty/. � JTAC hours of operation--The JTAC centers have resources available 24 hours a day, 7 days a week,
365 days a year.
Self-Help Online Tools and Resources
For quick and easy problem resolution, Juniper Networks has designed an online self-service portal called the Customer Support Center (CSC) that provides you with the following features: � Find CSC offerings: https://www.juniper.net/customers/support/ � Search for known bugs: https://prsearch.juniper.net/ � Find product documentation: https://www.juniper.net/documentation/ � Find solutions and answer questions using our Knowledge Base: https://kb.juniper.net/ � Download the latest versions of software and review release notes:
https://www.juniper.net/customers/csc/software/ � Search technical bulletins for relevant hardware and software notifications:
https://kb.juniper.net/InfoCenter/ � Join and participate in the Juniper Networks Community Forum:
https://www.juniper.net/company/communities/ � Create a service request online: https://myjuniper.juniper.net To verify service entitlement by product serial number, use our Serial Number Entitlement (SNE) Tool: https://entitlementsearch.juniper.net/entitlementsearch/
Creating a Service Request with JTAC
You can create a service request with JTAC on the Web or by telephone. � Visit https://myjuniper.juniper.net. � Call 1-888-314-JTAC (1-888-314-5822 toll-free in the USA, Canada, and Mexico). For international or direct-dial options in countries without toll-free numbers, see https://support.juniper.net/support/requesting-support/.

18
MX204 Router Overview
The Juniper Networks MX204 Universal Routing Platform is an Ethernet-optimized edge router with 400-Gbps capacity that provides both switching and carrier-class Ethernet routing. The MX204 router runs Junos operating system (Junos OS), enabling a wide range of business and residential applications and services, including high-speed transport and virtual private network (VPN) services, next-generation broadband multiplay services, and high-volume Internet data center internetworking. Each router provides full duplex, high-density Ethernet interfaces and high-capacity switching throughput and uses the Junos Trio chipset for increased scalability of Layer 2 and Layer 3 packet forwarding, buffering, and queuing.
Benefits of MX204 Router
� System Capacity--MX204 provides 400 Gbps of throughput and supports high-density 100-Gigabit Ethernet interfaces, and also discrete and breakout 10-Gigabit Ethernet and 1-Gigabit Ethernet interfaces--all in a single rack unit while consuming only 0.9 W/Gb.
� The Programmable Chipset--The chipset implemented in the MX Series routers has a programmable forwarding data structure that allows fast microcode changes in the hardware itself, and a programmable lookup engine that allows inline service processing. the chip's programmable QoS engine supports coarse and fine-grained queuing to address the requirements of core, edge, and aggregation use cases.
� Application-Aware Networking--On MX Series routers you can use deep packet inspection to detect applications, and by using the user-defined policies, you can determine traffic treatment for each application. This feature enables highly customized and differentiated services at scale.
� Junos Telemetry Interface--Using the Junos telemetry interface data, you can stream component-level data to monitor, analyze, and enhance the performance of the network. Analytics derived from this streaming telemetry can identify current and trending congestion, resource utilization, traffic volume, and buffer occupancy.
� Integrated Hardware-Based Timing-- You do not need to use external clocks because MX Series routers support highly scalable and reliable hardware-based timing, including Synchronous Ethernet for frequency, and the Precision Time Protocol (PTP) for frequency and phase synchronization. Synchronous Ethernet and PTP can be combined in a hybrid mode to achieve a high level of frequency (10 ppb) and phase (<1.5 uS) accuracy.

19
System Overview
The MX204 router is compact and one rack unit (1 U) tall. Several routers can be stacked in a single floor-to-ceiling rack for increased port density per unit of floor space. The MX204 router is a fixed-configuration router, and supports one built-in Routing Engine. The router runs on AC or DC power, with two dedicated power supply modules on each device. Cooling is handled by three fan modules. The MX204 has four rate-selectable ports that can be configured as 100-Gigabit Ethernet ports or 40-Gigabit Ethernet ports, or each port can be configured as four 10-Gigabit Ethernet ports (by using a breakout cable). The MX204 also has eight 10-Gigabit Ethernet ports. The four rate-selectable ports support QSFP28 and QSFP+ transceivers, whereas the eight 10-Gigabit Ethernet ports support SFP+ transceivers. Figure 1 on page 19 shows the front view of the MX204 router.
Figure 1: Front View of the MX204 Router

g009860

g0 0 9861

The MX204 router is a fixed-configuration router, and supports one built-in Routing Engine. The router runs on AC or DC power, with two dedicated power supply modules on each device. Cooling is handled by three fan modules. Table 3 on page 19 shows the components supported on the router.

Table 3: MX204 Router Components

Component

Description

Power supply module

Fan module

20
MX204 Chassis
IN THIS SECTION MX204 Chassis Description | 20 MX204 Component Redundancy | 22 MX204 Field-Replaceable Units | 23 MX204 Hardware Components and CLI Terminology | 23 MX204 Front and Rear Panel Components | 24 Alarm LEDs on the MX204 Front Panel | 25
MX204 Chassis Description
The router chassis is a rigid sheet metal structure that houses all the other router components. Figure 2 on page 20 shows the front of the fully configured chassis. The chassis measures 1.72 in. (4.37 cm) high, 19 in. (48.26 cm) wide, and 18.5 in. (47.0 cm) deep. You can install the router chassis in standard 760-mm deep (or larger) enclosed cabinets, 19-in. equipment racks, or telco open-frame racks. The total weight of fully loaded router is 22.7 lb (10.3 kg). For more information, see "MX204 Router Physical Specifications" on page 52.
Figure 2: Front View of the MX204 Router
The MX204 has four rate-selectable ports that can be configured as 100-Gigabit Ethernet ports or 40-Gigabit Ethernet ports, or each port can be configured as four 10-Gigabit Ethernet ports (by using a breakout cable). The MX204 also has eight 10-Gigabit Ethernet ports. The four rate-selectable ports support QSFP28 and QSFP+ transceivers, whereas the eight 10-Gigabit Ethernet ports support SFP+ transceivers. For more information on the rate selectability support for the MX204 router, see MX204 Router Port Speed Overview. Starting in Junos OS Release 18.3R1, you can use the Mellanox 10-Gbps pluggable adapter (QSFP+ to SFP+ adapter or QSA; model number: MAM1Q00A-QSA) to convert four lane-based ports to a single lane-based SFP+ port. The QSA adapter has the QSFP+ form factor with a receptacle for the SFP+ module.

g009860

21
Use the QSA adapter to convert a 40-Gbps port to a 10-Gbps (SFP+) or a 1-Gbps (SFP) port. The 1-Gbps SFP port supports auto-negotiation. You can configure auto-negotiation by using the command set interfaces interface-name gigether-options auto-negotiation. For more information, see auto-negotiation.
NOTE: � The interface name prefix must be xe. � Rate selectability at PIC level and port level does not support 1-Gbps speed.
NOTE: For a complete list of supported optics on MX204, see MX204 Transceivers.
The router comes in two variants�AC-powered and DC-powered. Figure 3 on page 21 and Figure 4 on page 21 shows the rear of the fully configured chassis. Figure 3: Rear View of the AC-Powered MX204 Router

g009862

1
1--Fan modules

2
2--Power supply modules (AC)

Figure 4: Rear View of the DC-Powered MX204 Router

g009863

1--Fan modules

2--Power supply modules (DC)

The electrostatic discharge (ESD) points on the router are located both on the front and on the rear of the chassis. Figure 5 on page 22 shows the electrostatic discharge (ESD) point on the router.

CAUTION: Before removing or installing components, attach an ESD strap to an ESD point, and place the other end of the strap around your bare wrist. Failure to use an ESD strap could result in damage to the hardware components.

Figure 5: ESD Points on the MX204 Router

Front panel

Rear panel

g009883

1--ESD points

MX204 Component Redundancy
A fully configured router is designed so that at no single point of failure can cause the entire system to fail. Only a fully configured router provides complete redundancy. All other configurations provide partial redundancy. The following major hardware components are redundant:
� Power supplies--The router supports two power supply modules. The MX204 router provides 1+1 redundancy for the system. Both AC and DC systems can withstand the failure of a single power supply without system interruption in 1+1 redundancy mode. If one power supply fails in a fully redundant system, the other power supply can provide full power to the router indefinitely.
� Cooling system--The cooling system has a total of three fan modules, which are controlled and monitored by the host subsystem. A fully configured router needs all the fan modules to operate normal. The fan modules are at the rear and are used to cool the router. If a fan fails or the temperature of the chassis rises above the temperature threshold, the speed of the remaining fans is automatically adjusted to keep the temperature within the acceptable range.
CAUTION: For a fully configured router, all the three fan modules and the two power supply modules must be operational, and in the event of any module failure the failed module must be replaced immediately.

SEE ALSO
Locating the Serial Number on an MX204 Router or Component | 136 Guidelines for Packing Hardware Components for Shipment | 139 How to Return a Hardware Component to Juniper Networks, Inc.

23
MX204 Field-Replaceable Units
Field-replaceable units (FRUs) are router components that can be replaced at the customer site. Replacing most FRUs requires minimal router downtime. The router uses the following types of FRUs: � Power supply modules (if redundant) � Fan modules (if redundant) � Transceiver modules

SEE ALSO
Replacing an MX204 AC Power Supply | 126 Replacing an MX204 DC Power Supply | 128 Replacing an MX204 Fan Module | 121

MX204 Hardware Components and CLI Terminology

The MX204 router support the components in Table 4 on page 23, listed in alphabetic order.

Table 4: MX204 Router Hardware Components and CLI Terminology

Component

Hardware Model Number

CLI Name

Description

Chassis

MX204

JNP204 [MX204]

"MX204 Chassis Description" on page 20

Cooling system Fan module

JNP-FAN-1RU

Fan Tray, Front to Back Airflow - AFO

"MX204 Cooling System Description" on page 26

Power system components

Power supply module MIC

� JPSU-650W-AC-AO � JPSU-650W-DC-AFO

� AC AFO 650W PSU � DC AFO 650W PSU

N/A (built-in)

PIC

"MX204 Power System Description" on page 30
N/A

MPC

N/A (built-in)

FPC

N/A

Table 4: MX204 Router Hardware Components and CLI Terminology (continued)

Component

Hardware Model Number

CLI Name

Description

Routing Engine

N/A (built-in)

RE-S-1600x8

N/A

Transceiver

See MX Series Interface Module Reference.

Xcvr

Hardware Compatibility Tool

Table 5 on page 24 lists the spare parts and blank panels available for the router.

Table 5: MX204 Spare Parts and Blank Panels

Model Number

Description

JNP204-CHAS

MX204 chassis, spare

JNP-PWR-BLNK-1

MX204 power blank cover panel

MX204 Front and Rear Panel Components
IN THIS SECTION Front Panel Components | 24 Rear Panel Components | 25

Front Panel Components
The front panel on the front of the router enables you to view status and troubleshooting information at a glance. The front panel contains LEDs for the router components, online/offline and reset buttons, auxiliary and console ports, clocking ports, and interface ports. "MX204 Chassis Description" on page 20 shows the front of the fully configured chassis.

Rear Panel Components

The rear panel of the router has slots for the power supply modules and fan modules. The power and fan modules are installed from the rear of the router. "MX204 Chassis Description" on page 20 and "MX204 Chassis Description" on page 20 shows the rear of the fully configured chassis.

Table 6 on page 25 lists the components on the rear panel of the MX204 router.

Table 6: Rear Panel Components in a Fully Configured MX204 Router

Component

Slots

Number of FRUs

Power supply module

0 and 1

Fan module

0 through 2

Alarm LEDs on the MX204 Front Panel

One alarm LED--labeled ALM--is located on the front panel of the router. A red light indicates a critical condition that can result in a system shutdown, and a yellow light indicates a less severe condition that requires monitoring or maintenance.

Table 7 on page 25 describes the alarm LED in more detail.

Table 7: Alarm LED on the MX204 Front Panel

Shape

Color

Description

Red

Critical alarm--Indicates a critical condition that

can cause the router to stop functioning. Possible

causes include component removal, failure, or

overheating.

Yellow

Warning alarm--Indicates a serious but nonfatal error condition, such as a maintenance alert or a significant increase in component temperature.

SEE ALSO Routine Maintenance Procedures for MX204 Routers | 109

26
MX204 Cooling System
IN THIS SECTION MX204 Cooling System Description | 26 MX204 Fan Status LED | 28
MX204 Cooling System Description
IN THIS SECTION Fan Trays | 26 Airflow | 27 Power Supply Cooling System | 28
The cooling system components work together to keep all router components within the acceptable temperature range. The cooling system consists of the following features and components: Fan Trays The chassis monitors the temperature of the router components. When the router is operating normally, the fans function at lower than full speed. If a fan fails or the ambient temperature rises above a threshold, the speed of the remaining fans is automatically adjusted to keep the temperature within the acceptable range. If the ambient maximum temperature specification is exceeded and the system cannot be adequately cooled, the Routing Engine shuts down the system by disabling output power from each power supply. The router has three fan modules (or fan trays) that install in the rear of the router. Each fan modules contain one counter-rotating fan. The fan modules are hot-insertable and hot-removable field-replaceable units (FRUs) (see Figure 6 on page 27).

Figure 6: Fan Module

g009876

1--Captive screw

2--Latch

g009877

Airflow
The router has front-to-back (AIR OUT) cooling system (see Figure 7 on page 28). Air is pulled through the front the chassis toward the fan tray, where it is exhausted out of the system.

Figure 7: Airflow Through the Router

Ports

FRUs

g009880

Power Supply Cooling System The power supply modules are self-cooling and are located in the rear of the router. Each power supply module has it's own built-in fan that cools the power supply module. The exhaust for the power supply modules are also located on the rear of the chassis.
SEE ALSO Maintaining the MX204 Fan Module | 120 Maintaining the MX204 Power Supplies | 124 Maintaining the MX204 Routing Engine | 109 Replacing an MX204 AC Power Supply | 126 Replacing an MX204 DC Power Supply | 128 Replacing an MX204 Fan Module | 121
MX204 Fan Status LED
The MX204 fan module does not have any LED--the fan status LEDs are located on the MX204 chassis. Figure 8 on page 29 shows the fan status LEDs.

29 Figure 8: Fan Status LEDs on the Router

g009498

1
1--Fan status LEDs

The fan status LED is a bicolor LED. Table 8 on page 29 describes the behavior of the fan status LED.

Table 8: Fan Status LED

Color

State

Description

Green

Blinking

Fan module hardware initialization is complete and software initialization is pending.

On steadily

Software initialization is complete and the fan is functioning normally.

Red

Fan module is faulty and not functioning normally.

steadily

�

Off

Fan module not present

SEE ALSO Replacing an MX204 Fan Module | 121 Maintaining the MX204 Fan Module | 120
MX204 AC Power System

IN THIS SECTION
MX204 Power System Description | 30 MX204 Power Supply Module LEDs | 32 MX204 Router AC Power Specifications | 35

30
AC Power Circuit Breaker Requirements for the MX204 Router | 36 AC Power Cord Specifications for MX204 Routers | 37
MX204 Power System Description
IN THIS SECTION AC Power Supply Description | 31 DC Power Supply Description | 31
The MX204 is powered using either AC or DC power. It supports two power supply modules (PSMs) located at the rear of the chassis in slots 0 and 1. Figure 9 on page 31 and Figure 10 on page 32 show the MX204 PSMs. The AC or DC power supply modules directly plug on to main board and are placed on the right side of the rear chassis. Each power supply has a handle, an ejector lever, and status LEDs. The power supply modules connect to the PSM board, which distributes the different output voltages produced by the power supply modules to the router components, depending on their voltage requirements. When both the power supply modules are present, they share power almost equally within a fully populated system. If the first power supply in a redundant configuration fails or is removed, the second power supply assumes the entire electrical load without interruption. A single power supply provides the maximum configuration with full power for as long as the router is operational. A second power supply can be installed for redundancy. The chassis is designed to support 1+1 feed redundancy. Redundant power supply is hot-removable and hot-insertable. If you remove a power supply from a router that uses only one power supply, then the router shuts down.
CAUTION: Do not mix AC and DC power supply modules in the same chassis.
NOTE: Routers configured with only one power supply are shipped with a blank panel installed over the power supply slot that is not populated.

31
The power supply modules are cooled by its own internal cooling system. A fan present in the power supply module monitors and maintains the temperature inside. AC Power Supply Description Each AC power supply weighs approximately 2.2 lb (1 kg) and consists of a handle, an ejector lever, an AC appliance inlet, a fan, and status LEDs to monitor the status of the power supply. Figure 9 on page 31 shows the AC power supply. Each inlet requires a dedicated AC power feed and a dedicated customer-site circuit breaker. We recommend that you use a minimum 20 A (110 VAC) or 16 A (220 VAC) customer-site circuit breaker, or as required by local code.
WARNING: The router is pluggable type A equipment installed in a restricted-access location. It has a separate protective earthing terminal (sized for 10�32 screws) provided on the chassis in addition to the grounding pin of the power supply cord. This separate protective earthing terminal must be permanently connected to earth.
Figure 9: AC Power Supply
DC Power Supply Description Each DC power supply weighs approximately 2.2 lb (1 kg) and consists of a handle, an ejection lever, status LEDs, and a terminal block that provides a single DC input (�48 VDC and return) that requires a dedicated customer site circuit breaker. We recommend that you use a dedicated customer-site circuit breaker rated for 25 A (�48 VDC) minimum, or as required by local code. Figure 10 on page 32 shows the DC power supply.

g009867

g009872

32 Figure 10: DC Power Supply
SEE ALSO Maintaining the MX204 Power Supplies | 124
MX204 Power Supply Module LEDs
IN THIS SECTION AC Power Supply Module LEDs | 32 DC Power Supply Module LEDs | 34
AC Power Supply Module LEDs Figure 11 on page 33 shows the AC power supply module components along with the status LEDs.

33 Figure 11: AC Power Supply Module LEDs and Components

g100048

1--Input status LED 2--Output status LED 3--Fault LED

4--Ejector lever 5--AC power cord retainer port

Figure 12 on page 33 shows the AC power supply module components with the AC power cord retainer along with the status LEDs.

Figure 12: AC Power Supply Module LEDs and Components��with the AC Power Cord Retainer

g009866

1--Input status LED 2--Output status LED 3--Fault LED

4--AC power cord retainer installed 5--Ejector lever

Table 9 on page 33 describes the LEDs on the AC power supply modules.

Table 9: AC Power Supply Module LEDs

Label

Color

State

Description

AC OK

Unlit

Off

The power supply is disconnected from power source, or the power supply is not receiving power.

Green

On steadily

Power supply is receiving power.

Table 9: AC Power Supply Module LEDs (continued)

Label

Color

State

Description

DC OK

Unlit

Off

Power supply output is off.

Green

On steadily

The power supply is sending out power correctly.

! (Fault)

Amber

On steadily

An error has been detected in the power supply. Replace the power supply as soon as possible. To maintain proper airflow through the chassis, leave the power supply installed in the chassis until you are ready to replace it.

NOTE: If the AC OK LED and the DC OK LED are unlit, either the AC power cord is not installed properly or the power supply fuse has failed. If the AC OK LED is lit and the DC OK LED is unlit, the AC power supply is installed properly, but the power supply has an internal failure.

DC Power Supply Module LEDs Figure 13 on page 34 shows the DC power supply modules status LEDs. Figure 13: DC Power Suppy Module LEDs

g009871

1--Input LED 2--Output LED

3--Fault LED

CAUTION: On the DC power supply, the V+ terminals are shunted internally together, as are the V� terminals. The same polarity terminal can be wired together from the same source to provide an additional current path in a higher power chassis. Do not connect the terminals to different sources.

Table 10 on page 35 describes the LEDs on the DC power supply modules.

Table 10: DC Power Supply Module LEDs

Label

Color

State

Description

IN (Input)

Unlit

Off

The power supply is disconnected from power source, or the power supply is not receiving power.

Green

On steadily

Power supply is receiving power.

OUT (Output)

Unlit

Off

Power supply output is off.

Green

On steadily

The power supply is sending out power correctly.

! (Fault)

Amber

On steadily

SEE ALSO Routine Maintenance Procedures for MX204 Routers | 109 Maintaining the MX204 Power Supplies | 124
MX204 Router AC Power Specifications
Table 11 on page 36 lists the AC power system electrical specifications.

Table 11: AC Power System Electrical Specifications

Item

Specification

AC input voltage

Operating range: 100 through 240 VAC

AC input line frequency 50 through 60 Hz (nominal)

AC system current rating 3.2 A @ 100 VAC 1.37 A @ 240 VAC

AC system input power 312 W

Table 12 on page 36 lists the AC power supply electrical specifications.

Table 12: AC Power Supply Electrical Specifications

Item

Specification

Maximum output power 650 W

AC input voltage

Operating range: 100 through 127 VAC 200 through 240 VAC

AC input line frequency 50 to 60 Hz (nominal)

AC input current rating 7.8 A @ 100 VAC 3.8 A @ 240 VAC

SEE ALSO Maintaining the MX204 Power Supplies | 124
AC Power Circuit Breaker Requirements for the MX204 Router
We recommend that you use a dedicated customer-site circuit breaker rated for 20 A (110 VAC) minimum or 16 A (220 VAC) minimum for each AC power feed, or as required by local code. Doing so enables you to operate the router in any configuration without upgrading the power infrastructure.

37
SEE ALSO Replacing an MX204 AC Power Supply | 126 Power Consumption for an AC-Powered MX204 Router | 67 General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173
AC Power Cord Specifications for MX204 Routers
A detachable AC power cord is supplied with the AC power supply modules. The coupler is type C13 as described by International Electrotechnical Commission (IEC) standard 60320. The plug end of the power cord fits into the power source outlet that is standard for your geographical location.
CAUTION: The AC power cord provided with each power supply is intended for use with that power supply only and not for any other use.

NOTE: In North America, AC power cords must not exceed 4.5 meters (approximately 14.75 feet) in length, to comply with National Electrical Code (NEC) Sections 400-8 (NFPA 75, 5-2.2) and 210-52 and Canadian Electrical Code (CEC) Section 4-010(3). The cords supplied with the switch are in compliance.

Table 13 on page 37 gives the AC power cord specifications for the countries and regions listed in the table.

Table 13: AC Power Cord Specifications

Country/Region

Electrical Specifications Plug Standards

Juniper Model Number

Argentina

250 VAC, 10 A, 50 Hz

IRAM 2073 Type RA/3

CBL-EX-PWR-C13-AR

Australia

250 VAC, 10 A, 50 Hz

AS/NZZS 3112 Type SAA/3

CBL-EX-PWR-C13-AU

Brazil

250 VAC, 10 A, 50 Hz

NBR 14136 Type BR/3

CBL-EX-PWR-C13-BR

China

250 VAC, 10 A, 50 Hz

GB 1002-1996 Type PRC/3 CBL-EX-PWR-C13-CH

Table 13: AC Power Cord Specifications (continued)

Country/Region

Electrical Specifications Plug Standards

Juniper Model Number

Europe (except Italy, Switzerland, and United Kingdom)

250 VAC, 10 A, 50 Hz

CEE (7) VII Type VIIG

CBL-EX-PWR-C13-EU

India

250 VAC, 10 A, 50 Hz

IS 1293 Type IND/3

CBL-EX-PWR-C13-IN

Israel

250 VAC, 10 A, 50 Hz

SI 32/1971 Type IL/3G

CBL-EX-PWR-C13-IL

Italy

250 VAC, 10 A, 50 Hz

CEI 23-16 Type I/3G

CBL-EX-PWR-C13-IT

Japan

125 VAC, 12 A, 50 Hz or 60 SS-00259 Type VCTF Hz

CBL-EX-PWR-C13-JP

Korea

250 VAC, 10 A, 50 Hz or 60 CEE (7) VII Type VIIGK Hz

CBL-EX-PWR-C13-KR

North America

125 VAC, 13 A, 60 Hz

NEMA 5-15 Type N5-15 CBL-EX-PWR-C13-US

South Africa

250 VAC, 10 A, 50 Hz

SABS 164/1:1992 Type ZA/13

CBL-EX-PWR-C13-SA

Switzerland

250 VAC, 10 A, 50 Hz

SEV 6534-2 Type 12G

CBL-EX-PWR-C13-SZ

Taiwan

125 VAC, 11 A and 15 A, 50 Hz

NEMA 5-15P Type N5-15P CBL-EX-PWR-C13-TW

United Kingdom

250 VAC, 10 A, 50 Hz

BS 1363/A Type BS89/13 CBL-EX-PWR-C13-UK

Figure 14 on page 38 illustrates the plug on the power cord for some of the countries or regions listed in Table 13 on page 37.

Figure 14: AC Plug Types

SEE ALSO

39
General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173
MX204 DC Power System
IN THIS SECTION MX204 Router DC Power Specifications | 39 DC Power Circuit Breaker Requirements for the MX204 Router | 40 DC Power Source Cabling for MX204 Router | 41 DC Power Cable Specifications for MX204 Router | 42

MX204 Router DC Power Specifications

Table 14 on page 39 lists the DC power system electrical specifications.

Table 14: DC Power System Electrical Specifications

Item

Specification

DC input voltage

Operating range: �40 through �72 VDC

DC system input current 20 A @ �44 VDC (maximum) rating

DC system input power 331 W 7.75 A @ �44 VDC

Table 15 on page 39 lists the DC power supply electrical specifications.

Table 15: DC Power Supply Electrical Specifications

Item

Specification

Maximum output power 650 W

Table 15: DC Power Supply Electrical Specifications (continued)

Item

Specification

DC input voltage

Minimum: �40 VDC Nominal: �48 VDC, �60 VDC Operating range: �40 to �72 VDC

DC input current rating 20 A @ �44 VDC

SEE ALSO Maintaining the MX204 Power Supplies | 124 Replacing an MX204 DC Power Supply | 128
DC Power Circuit Breaker Requirements for the MX204 Router
Each DC power supply has a single DC input (�48 VDC and return) that requires a dedicated circuit breaker. We recommend that you use a dedicated customer-site circuit breaker rated for 25 A (�48 VDC) minimum, or as required by local code. Doing so enables you to operate the router in any configuration without upgrading the power infrastructure. If you plan to operate a DC-powered router at less than the maximum configuration and do not provision a 25 A (�48 VDC) circuit breaker, we recommend that you provision a dedicated customer-site circuit breaker for each DC power supply rated for at least 125 percent of the continuous current that the system draws at �48 VDC.
SEE ALSO Replacing an MX204 DC Power Supply | 128 Power Consumption for a DC-Powered MX204 Router | 69 General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173

41
DC Power Source Cabling for MX204 Router
The DC power supply in PS0 must be powered by a dedicated power feed derived from feed A, and the DC power supply in PS1 must be powered by a dedicated power feed derived from feed B. This configuration provides the commonly deployed A/B feed redundancy for the system.
CAUTION: You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (�) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.
WARNING: For field-wiring connections, use copper conductors only.
CAUTION: Power cords and cables must not block access to device components or drape where people could trip on them.
SEE ALSO Replacing an MX204 DC Power Supply | 128 Power Consumption for a DC-Powered MX204 Router | 69 General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173

42
DC Power Cable Specifications for MX204 Router
IN THIS SECTION DC Power Cable Lug Specifications | 42 DC Power Cable Specifications | 42

DC Power Cable Lug Specifications
The accessory box shipped with the router includes the cable lugs that attach to the terminal of each power supply.

Figure 15: DC Power Cable Lug

.15 dia

.25

.170 max

wire diameter

(insulation)

g009544

.71 .84
All measurements in inches

CAUTION: Before router installation begins, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the router.

DC Power Cable Specifications You must supply four DC power cables that meet the following specifications: 14-16 AWG (2.08 - 1.3 mm2), minimum 60� C wire, or as required by the local code.
SEE ALSO

43
Replacing an MX204 DC Power Supply | 128 Power Consumption for a DC-Powered MX204 Router | 69
MX204 Host Subsystem
IN THIS SECTION MX204 Routing Engine Description | 43 MX204 Routing Engine LEDs | 46
MX204 Routing Engine Description
IN THIS SECTION Routing Engine Functions | 43 Routing Engine Components | 44 Routing Engine Front Panel | 44 Routing Engine Interface Ports | 45
The host subsystem provides routing protocol processes, as well as software processes that control the router's interface, the chassis components, system management, and user access to the router. These routing processes run on top of a kernel that interacts with the Packet Forwarding Engine. The MX204 host subsystem consists of a single built-in Routing Engine. This topic covers: Routing Engine Functions The Routing Engine is built-in on the MX204 baseboard and cannot be replaced. The Routing Engine performs all route-processing functions, and provides performs chassis control and management plane functionality. The Routing Engine also provides control plane functions.

The Routing Engine supports the following functionalities to manage the operation of the router:
� System control functions such as environmental monitoring � Routing Layer 2 and Layer 3 protocols � Communication to components such as line cards, power supply, and cooling system � Transparent clocking � Alarm and logging functions

Routing Engine Components
The Routing Engine consists of the following internal components: � High-performance 1.6-GHz Intel 8 Core X86 CPU � 32-GB DDR4 RAM � 100-GB SATA SSD

Routing Engine Front Panel Figure 16 on page 44 shows the front panel of the MX204 chassis.

Figure 16: MX204 Ports
1

4 5 6 78

g009897

14 13

12 11 10 9

1--Rate-selectable ports 2--Management (MGMT) port 3--BITS port with LEDs 4--USB port 5--1PPS and 10MHz GPS input and output ports
6--ONLINE LED 7--SSD1 LED 8--OFFLINE button

9--RESET button 10--SSD0 LED 11--Alarm (ALM) LED 12--OK/FAIL LED 13--Time of day (ToD) port with LEDs (This port is
reserved for future use) 14--Console (CON) port 15--10-Gigabit Ethernet SFP+ ports 16--PTP grandmaster clock (GM/PTP) port

45
Routing Engine Interface Ports
The ports located on the router connect the Routing Engine to one or more external devices on which system administrators can issue Junos OS CLI commands to manage the router. In addition, ports to connect external clock interfaces for BITS and GPS function are also available on the router. The Routing Engine interface ports with the indicated labels function are as follows (see Figure 16 on page 44): � CON--Connects the Routing Engine to a system console through a serial cable with an RJ-45 connector. � MGMT--Connects the Routing Engine through an Ethernet connection to a management LAN (or any
other device that plugs into an Ethernet connection) for out-of-band management. The port uses an autosensing RJ-45 connector to support 10-Mbps, 100-Mbps, or 1000-Mbps connections. Two small LEDs (an activity LED and a link LED) on the port indicate the connection in use. The link LED is: � lit amber (steady) when the 1000-Mbps link is up. � lit green (steady) when the 100-Mbps link is up. � Off when the 10-Mbps link is up. The activity LED is: � lit green (blinking) when traffic is passing through the port. � lit green (steady) when traffic is not passing through the port. Both activity and link LEDs are off when the link is down. � BITS--Building-integrated timing supply (BITS) external clocking interface for connecting to external clocking devices. � ToD--Time-of-day (TOD) port on the front panel of the router that enables you to connect external timing signal sources.
NOTE: This port is reserved for future use.
� 10MHZ (one input and one output)--The 10-MHz timing connectors on the front panel of the router that connect to external clock signal sources. The clocking ports provide the synchronized output clocks from any one of the reference clock inputs based on the clock's priority.

46
� PPS (one input and one output)--1-pulse-per-second (PPS) connectors on the front panel of the router that connect to external clock signal sources. The clocking ports provide the synchronized output clocks from any one of the reference clock inputs based on the clock's priority.
� USB--Provides a removable media interface through which you can install Junos OS manually. Junos OS supports USB version 1.0 and later.

SEE ALSO
RJ-45 Connector Pinouts for MX Series CB-RE or RCB Auxillary and Console Ports | 65 RJ-45 Connector Pinouts for an MX Series CB-RE or RCB Management Port | 66 MX204 Chassis Description | 20

MX204 Routing Engine LEDs
The Routing Engine is built-in on the MX204 and is attached to the baseboard and cannot be replaced. The status of the Routing Engine is displayed by the ONLINE and OK/FAIL LEDs on the front panel of the MX204 chassis. Table 16 on page 46 describes the functions and LEDs on the MX204 router.
NOTE: The functioning of the MX204 router is controlled by the Routing Engine, and the LEDs present on the front panel of the router displays the status and functioning of the MX204 router.

Table 16: MX204 LEDs

Label

Color

State

Description

ONLINE Green

On steadily

Both Junos OS and Linux are successfully loaded on the router.

Blinking Router is starting Junos OS.

Red

Router has loaded Linux.

steadily

Blinking Router is starting Linux.

�

Off

Router is offline.

Table 16: MX204 LEDs (continued)

Label

Color

State

Description

OK/FAIL Green

On steadily

Router is functioning normally.

Red

Blinking Router has failed.

�

Off

Router is not powered on.

ALM

Red

On steadily

Critical alarm--Indicates a critical condition that can cause the router to stop functioning. Possible causes include component failure, or any major software failure.

Yellow

On steadily

Warning alarm--Indicates a serious but nonfatal error condition, such as a maintenance alert or a significant increase in component temperature.

�

Off

There is no alarm.

SSD0

Green

Blinking SSD0 is being accessed by the router.

�

Off

SSD0 is not active or not being accessed.

SSD1

Green

Blinking SSD1 is being accessed by the router.

�

Off

SSD1 is not active or not being accessed.

Table 16: MX204 LEDs (continued)

Label

Color

State

Description

BITS

Green

On Steadily

When there is no loss (BITS is in locked state).

(Activity LED; left)

�

Off

When there is loss of signal or loss of line.

(Activity LED; left)

Amber

On steadily

When there is loss of signal or loss of line.

(Link LED; right)

�

Off

When there is no loss (BITS is in locked state).

(Link LED; right)

2 CHAPTER
Site Planning, Preparation, and Specifications
MX204 Site Preparation Checklist | 50 MX204 Site Guidelines and Requirements | 51 MX204 Network Cable and Transceiver Planning | 60 MX204 Management and Console Port Specifications and Pinouts | 65 MX204 Power Planning | 67

MX204 Site Preparation Checklist

The checklist in Table 17 on page 50 summarizes the tasks you must perform when preparing a site for router installation.

Table 17: MX204 Site Preparation Checklist

Item or Task

For More Information

Performed by Date

Environment

Verify that environmental factors such as temperature and humidity do not exceed router tolerances.

"MX204 Router Environmental Specifications" on page 52

Power
Locate sites for connection of system grounding.

"MX204 Router Grounding Specifications" on page 54

Measure distance between external power "MX204 Router DC Power

sources and router installation site.

Specifications" on page 39

"MX204 Router AC Power Specifications" on page 35

Calculate the power consumption and requirements.

"Power Consumption for a DC-Powered MX204 Router" on page 69
"Power Consumption for an AC-Powered MX204 Router" on page 67

Rack Select the type of rack or cabinet.

"MX204 Router Rack Requirements" on page 58
"MX204 Router Cabinet Requirements and Specifications" on page 55

Table 17: MX204 Site Preparation Checklist (continued)

Item or Task

For More Information

Performed by Date

Plan rack or cabinet location, including required space clearances.

"MX204 Router Clearance Requirements for Airflow and Hardware Maintenance" on page 57

If a rack is used, secure rack to floor and building structure.

"MX204 Router Rack Requirements" on page 58

Cables

Acquire cables and connectors:
� Determine the number of cables needed based on your planned configuration.

"Calculating Power Budget and Power Margin for Fiber-Optic Cables" on page 60

� Review the maximum distance allowed for each cable. Choose the length of cable based on the distance between the hardware components being connected.

RELATED DOCUMENTATION
MX204 Installation Overview | 72 Tools Required to Install the MX204 Chassis in Rack | 77 Installing the MX204 Chassis in a Rack | 77

MX204 Site Guidelines and Requirements

IN THIS SECTION
MX204 Router Physical Specifications | 52 MX204 Router Environmental Specifications | 52 MX204 Router Grounding Specifications | 54 MX204 Router Cabinet Requirements and Specifications | 55

52
MX204 Router Clearance Requirements for Airflow and Hardware Maintenance | 57 MX204 Router Rack Requirements | 58

MX204 Router Physical Specifications

Table 18 on page 52 summarizes the physical specifications for the router.

Table 18: Router Physical Specifications

Description

Weight

Width

Depth

Height

Chassis fully loaded with all FRUs

AC-powered chassis: 22.7 lb (10.3 kg)

19 in. (48.26 cm)

18.50 in. (47.0 cm)
20.43 in. (51.89 cm) with fan and power handles

1.72 in. (4.37 cm; 1 U)

Fan tray

1.5 lb (0.68 kg)

1.89 in. (4.8 cm)

5.78 in. (14.68 cm) 1.64 in. (4.17 cm)

AC power supply

2.2 lb (1 kg)

2.23 in. (5.66 cm) 14.50 in. (36.83 cm) 1.58 in. (4.01 cm)

DC power supply

2.2 lb (1 kg)

2.23 in. (5.66 cm) 14.53 in. (36.91 cm) 1.67 in. (4.24 cm)

SEE ALSO MX204 Router Overview | 18 MX204 Chassis Description | 20
MX204 Router Environmental Specifications
Table 19 on page 53 specifies the environmental specifications required for normal router operation. In addition, the site should be as dust-free as possible.

Table 19: Router Environmental Specifications

Description

Value

Altitude

No performance degradation up to 10,000 ft (3048 m)

Relative humidity

Normal operation ensured in relative humidity range of 5% through 90%, noncondensing

Temperature Seismic

� Normal operation ensured in temperature range of 32�F (0�C) through 104�F (40�C)
� Short-term operation ensured in temperature range of 23� F (�5� C) through 131� F (55� C).
NOTE: As defined in NEBS GR-63-CORE, Issue 4, short-term events can be up to 96 hours in duration but not more than 15 days per year.
� Nonoperating storage temperature in shipping container: �40�F (�40�C) through 158�F (70�C)
Designed to meet Telcordia Technologies Zone 4 earthquake requirements

Maximum thermal output 1705 BTU/hour (500 W)

NOTE: Install the router only in restricted-access areas, such as dedicated equipment rooms and equipment closets, in accordance with Articles 110-16, 110-17, and 110-18 of the National Electrical Code, ANSI/NFPA 70.

SEE ALSO
Routine Maintenance Procedures for MX204 Routers | 109 General Safety Guidelines for Juniper Networks Devices General Safety Warnings for Juniper Networks Devices | 146

54
MX204 Router Grounding Specifications
Grounding Points Specifications To meet safety and electromagnetic interference (EMI) requirements and to ensure proper operation, the router must be adequately grounded before power is connected. To ground AC-powered and DC-powered routers, you must connect a grounding cable to earth ground and then attach it to the chassis grounding points by using the two screws provided. Figure 17 on page 54 shows the grounding point location on the router. A protective earthing terminal bracket is required for connecting the chassis to earth ground. This two-holed bracket attaches on the side of the chassis through the mounting rail and provides a protective earthing terminal for the router. The grounding points are studs sized for 10�32 screws. The 10�32 screws are provided with the MX204 router. The grounding points are spaced at 0.75-in. (19.1-mm) centers. Two threaded holes are provided on the rear left side of the chassis for connecting the router to earth ground. The grounding points fit 10�32 screws.
NOTE: Additional grounding is provided to an AC-powered router when you plug its power supply modules into grounded AC power receptacles.
Figure 17: Grounding Points on the Router
1
Rear panel
Grounding Cable Lug Specifications You must provide one grounding cable lug that attaches to the grounding cable and 10�32 screws used to secure the grounding cable to the grounding points.
CAUTION: Before router installation begins, a licensed electrician must attach a cable lug to the grounding and power cables that you supply. A cable with an incorrectly attached lug can damage the router.

g009882

55
Grounding Cable Specifications
The grounding lug required is a Panduit LCD10-10A-L or equivalent (not provided). The grounding lug accommodates 12 AWG (2.5 mm�) stranded wire. The grounding cable that you provide for the chassis must be the same size or heavier than the input wire of each power supply module. Minimum recommendations are 12 AWG (2.5 mm�) stranded wire, 60� C wire, or as permitted by local code.

SEE ALSO
Tools and Parts Required for MX204 Router Grounding and Power Connections | 84 Prevention of Electrostatic Discharge Damage | 173 MX204 Router AC Power Specifications | 35 MX204 Router DC Power Specifications | 39

MX204 Router Cabinet Requirements and Specifications

Table 20 on page 55 summarizes cabinet requirements and specifications for the MX204 router.

Table 20: Cabinet Requirements and Specifications for an MX204 Router

Cabinet Requirement

Guidelines for the MX204 Router

Cabinet size and clearance

� The minimum-sized cabinet that can accommodate the router is 19-in. (482-mm) wide, and 23.62-in. (600-mm) deep. A cabinet larger than the minimum requirement provides better airflow and reduces the chance of overheating. If you provide adequate cooling air and airflow clearance, you can stack several routers in a cabinet that has sufficient usable vertical space. Each router requires 1 U.
A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310-D) published by the Electronic Components Industry Association (ECIA) (http://www.ecianow.org).
� With adequate cooling air and airflow clearance, you can stack multiple MX204 routers in a cabinet with a four-post rack. In all cases, the rack must meet the strength requirements to support the weight.
� The minimum total clearance inside the cabinet is 30.7 in. (780 mm) between the inside of the front door and the inside of the rear door.

Table 20: Cabinet Requirements and Specifications for an MX204 Router (continued)

Cabinet Requirement

Guidelines for the MX204 Router

Cabinet airflow requirements

When you install the router in a cabinet, you must ensure that ventilation through the cabinet is sufficient to prevent overheating. Consider the following requirements to when planning for chassis cooling:
� Airflow must always be from front to back with respect to the rack. If the device has side to rear airflow, then provisions must be made to ensure that fresh air from the front of the rack is supplied to the inlets, and exhaust exits from the rear of the rack. The device must not interfere with the cooling of other systems in the rack. Fillers must be used as appropriate in the rack to ensure there is no recirculation of heated exhaust air back to the front of the rack. Care must also be taken around cables to ensure no leakage of air in situations where recirculation might result.
� Ensure that the cabinet allows the chassis hot exhaust air to exit from the cabinet without recirculating into the router. An open cabinet (without a top or doors) that employs hot air exhaust extraction from the top allows the best airflow through the chassis. If the cabinet contains a top or doors, perforations in these elements assist with removing the hot air exhaust. For an illustration of chassis airflow, see Figure 18 on page 57.
� Ensure that the cool air supply you provide through the cabinet can adequately dissipate the thermal output of the router.
� Route and dress all cables to minimize the blockage of airflow to and from the chassis.
� Ensure that the spacing of rails and adjacent racks allows for the proper clearance around the router and rack as specified in "MX204 Router Clearance Requirements for Airflow and Hardware Maintenance" on page 57.
� Install the router as close as possible to the front of the cabinet so that the chassis just clears the inside of the front door. This maximizes the clearance in the rear of the cabinet for critical airflow.

Figure 18: Airflow Through MX204 Chassis

Ports

FRUs

g009880

SEE ALSO MX204 Installation Overview | 72 MX204 Cooling System Description | 26
MX204 Router Clearance Requirements for Airflow and Hardware Maintenance
When planning the installation site, allow sufficient clearance around the rack (see Figure 19 on page 58): � For the cooling system to function properly, the airflow around the chassis must be unrestricted. Allow
at least 6 in. (15.2 cm) of clearance between side-cooled routers. Allow 2.8 in. (7 cm) between the side of the chassis and any non-heat-producing surface such as a wall. � For service personnel to remove and install hardware components, there must be adequate space at the front and back of the router. At least 24 in. (61 cm) are required both in front of and behind the router. NEBS GR-63 recommends that you allow at least 30 in. (76.2 cm) in front of the rack and 24 in. (61 cm) behind the router. � To accommodate power cable bend radius at the rear of the chassis and the interface cable bend radius at the front of the chassis, provide at least 2.75 in. (7 cm) at the rear and 3.5 in. (8.9 cm) at the front.

58 Figure 19: MX204 Chassis Dimensions and Clearance Requirements

MX204 Router Rack Requirements

The MX204 router can be installed in a standard 19-in. rack. Many types of racks are acceptable, including four-post (telco) racks and open-frame racks. Table 21 on page 58 summarizes rack requirements and specifications for the router.

Table 21: Rack Requirements and Specifications for an MX204 Router

Rack Requirement

Guidelines

Rack type and mounting bracket hole spacing

Use a four-post rack. You can mount the router on any four-post rack that provides bracket holes or hole patterns spaced at 1 U (1.75-in./4.44-cm) increments and that meets the size and strength requirements specified in this table.
A U is the standard rack unit defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310�D) published by the Electronics Components Industry Association (http://www.ecianow.org/).

Table 21: Rack Requirements and Specifications for an MX204 Router (continued)

Rack Requirement

Guidelines

Rack size and strength
Rack connection to the building structure

� Ensure that the rack is a 19-in. rack as defined in Cabinets, Racks, Panels, and Associated Equipment (document number EIA-310�D) published by the Electronics Components Industry Association (http://www.ecianow.org/).
� Ensure that the rack is one of the following standard lengths: � 23.6 in. (600 mm) � 30.0 in. (762 mm) � 31.5 in. (800 mm)
� The rack rails must be spaced widely enough to accommodate the router chassis's external dimensions (see "MX204 Router Physical Specifications" on page 52). The outer edges of the mounting brackets extend the width to 19 in. (48.3 cm). The spacing of rails and adjacent racks must also allow for the clearances around the router and rack.
� The router ships with the front-mounting brackets fixed in the front-mount position on the chassis. You can move the rear-mounting brackets based on the depth of the rack.
� The chassis height of 1.72 in. (4.37 cm) is approximately 1 U (rack unit). � The rack must be strong enough to support the weight of the fully configured
router, up to 22.7 lb (10.3 kg).
� Either end of the router must be mounted flush with the rack and still be adjustable for racks with different depths. The front and rear rack rails must be spaced between 23.62 in. (600 mm) and 31.5 in. (800 mm) front to back.
� Ensure that the spacing of rails and adjacent racks allows for the proper clearance around the router and rack.
� Secure the rack to the building structure. � If earthquakes are a possibility in your geographic area, secure the rack to
the floor.
� Secure the rack to the ceiling brackets as well as wall or floor brackets for maximum stability.

SEE ALSO MX204 Installation Overview | 72

60
MX204 Network Cable and Transceiver Planning
IN THIS SECTION Calculating Power Budget and Power Margin for Fiber-Optic Cables | 60 CB-RE and RCB Interface Cable and Wire Specifications for MX Series Routers | 62 Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion | 63

Calculating Power Budget and Power Margin for Fiber-Optic Cables
Use the information in this topic and the specifications for your optical interface to calculate the power budget and power margin for fiber-optic cables.
TIP: You can use the Hardware Compatibility Tool to find information about the pluggable transceivers supported on your Juniper Networks device.

To calculate the power budget and power margin, perform the following tasks: 1. How to Calculate Power Budget for Fiber-Optic Cable | 60 2. How to Calculate Power Margin for Fiber-Optic Cable | 61

How to Calculate Power Budget for Fiber-Optic Cable

To ensure that fiber-optic connections have sufficient power for correct operation, you need to calculate

the link's power budget, which is the maximum amount of power it can transmit. When you calculate the

power budget, you use a worst-case analysis to provide a margin of error, even though all the parts of an

actual system do not operate at the worst-case levels. To calculate the worst-case estimate of power

budget (P ), you assume minimum transmitter power (P ) and minimum receiver sensitivity (P ):

P =P �P
BTR

The following hypothetical power budget equation uses values measured in decibels (dB) and decibels referred to one milliwatt (dBm):

P =P �P
B TR

P = �15 dBm � (�28 dBm)
B
P = 13 dB
B
How to Calculate Power Margin for Fiber-Optic Cable

After calculating a link's power budget, you can calculate the power margin (P ), which represents the
M
amount of power available after subtracting attenuation or link loss (LL) from the power budget (P ). A
B
worst-case estimate of P assumes maximum LL:
M
P = P � LL
MB
P greater than zero indicates that the power budget is sufficient to operate the receiver.
M
Factors that can cause link loss include higher-order mode losses, modal and chromatic dispersion, connectors, splices, and fiber attenuation. Table 22 on page 61 lists an estimated amount of loss for the factors used in the following sample calculations. For information about the actual amount of signal loss caused by equipment and other factors, refer to vendor documentation.

Table 22: Estimated Values for Factors Causing Link Loss

Link-Loss Factor

Estimated Link-Loss Value

Higher-order mode losses

Single mode--None Multimode--0.5 dB

Modal and chromatic dispersion

Single mode--None
Multimode--None, if product of bandwidth and distance is less than 500 MHz-km

Connector

0.5 dB

Splice

0.5 dB

Fiber attenuation

Single mode--0.5 dB/km Multimode--1 dB/km

The following sample calculation for a 2-km-long multimode link with a power budget (P ) of 13 dB uses
B
the estimated values from Table 22 on page 61 to calculate link loss (LL) as the sum of fiber attenuation (2 km @ 1 dB/km, or 2 dB) and loss for five connectors (0.5 dB per connector, or 2.5 dB) and two splices (0.5 dB per splice, or 1 dB) as well as higher-order mode losses (0.5 dB). The power margin (P ) is calculated
M
as follows:
P = P � LL
MB

62
P = 13 dB � 2 km (1 dB/km) � 5 (0.5 dB) � 2 (0.5 dB) � 0.5 dB
M
P = 13 dB � 2 dB � 2.5 dB � 1 dB � 0.5 dB
M
P = 7 dB
M
The following sample calculation for an 8-km-long single-mode link with a power budget (P ) of 13 dB
B
uses the estimated values from Table 22 on page 61 to calculate link loss (LL) as the sum of fiber attenuation (8 km @ 0.5 dB/km, or 4 dB) and loss for seven connectors (0.5 dB per connector, or 3.5 dB). The power margin (P ) is calculated as follows:
M
P = P � LL
MB
P = 13 dB � 8 km (0.5 dB/km) � 7(0.5 dB)
M
P = 13 dB � 4 dB � 3.5 dB
M
P = 5.5 dB
M
In both examples, the calculated power margin is greater than zero, indicating that the link has sufficient power for transmission and does not exceed the maximum receiver input power.

CB-RE and RCB Interface Cable and Wire Specifications for MX Series Routers
Table 23 on page 62 lists the specifications for the cables that connect to management ports and the wires that connect to the alarm relay contacts.
NOTE: In routers where the Routing Engine (RE) and Control Board (CB) are integrated into a single board, a CB-RE is known as Routing and Control Board (RCB). The RCB is a single FRU that provides RE and CB functionality.

Table 23: Cable and Wire Specifications for Routing Engine and RCB Management and Alarm Interfaces

Cable

Cable/Wire Maximum

Router

Port

Specification Supplied

Length

Receptacle

Routing Engine console or auxiliary interface

RS-232 (EIA-232) serial cable

1.83-m length with RJ-45/DB-9 connectors

1.83 m

RJ-45 socket

Table 23: Cable and Wire Specifications for Routing Engine and RCB Management and Alarm Interfaces (continued)

Cable

Cable/Wire Maximum

Router

Port

Specification Supplied

Length

Receptacle

Routing Engine Ethernet interface

Category 5 cable or equivalent suitable for 100Base-T operation

One 4.57-m length with RJ-45/RJ-45 connectors

100 m

RJ-45 autosensing

Alarm relay contacts

Wire with

gauge between

28-AWG and

14-AWG (0.08 and 2.08 mm2)

None

Fiber-Optic Cable Signal Loss, Attenuation, and Dispersion
IN THIS SECTION Signal Loss in Multimode and Single-Mode Fiber-Optic Cable | 63 Attenuation and Dispersion in Fiber-Optic Cable | 64

Signal Loss in Multimode and Single-Mode Fiber-Optic Cable
Multimode fiber is large enough in diameter to allow rays of light to reflect internally (bounce off the walls of the fiber). Interfaces with multimode optics typically use LEDs as light sources. However, LEDs are not coherent sources. They spray varying wavelengths of light into the multimode fiber, which reflects the light at different angles. Light rays travel in jagged lines through a multimode fiber, causing signal dispersion. When light traveling in the fiber core radiates into the fiber cladding, higher-order mode loss results. Together these factors limit the transmission distance of multimode fiber compared with single-mode fiber.
Single-mode fiber is so small in diameter that rays of light can reflect internally through one layer only. Interfaces with single-mode optics use lasers as light sources. Lasers generate a single wavelength of light,

64
which travels in a straight line through the single-mode fiber. Compared with multimode fiber, single-mode fiber has higher bandwidth and can carry signals for longer distances.
Exceeding the maximum transmission distances can result in significant signal loss, which causes unreliable transmission.
Attenuation and Dispersion in Fiber-Optic Cable
Correct functioning of an optical data link depends on modulated light reaching the receiver with enough power to be demodulated correctly. Attenuation is the reduction in power of the light signal as it is transmitted. Attenuation is caused by passive media components, such as cables, cable splices, and connectors. Although attenuation is significantly lower for optical fiber than for other media, it still occurs in both multimode and single-mode transmission. An efficient optical data link must have enough light available to overcome attenuation.
Dispersion is the spreading of the signal over time. The following two types of dispersion can affect an optical data link:
� Chromatic dispersion--Spreading of the signal over time resulting from the different speeds of light rays. � Modal dispersion--Spreading of the signal over time resulting from the different propagation modes in
the fiber.
For multimode transmission, modal dispersion, rather than chromatic dispersion or attenuation, usually limits the maximum bit rate and link length. For single-mode transmission, modal dispersion is not a factor. However, at higher bit rates and over longer distances, chromatic dispersion rather than modal dispersion limits maximum link length.
An efficient optical data link must have enough light to exceed the minimum power that the receiver requires to operate within its specifications. In addition, the total dispersion must be less than the limits specified for the type of link in Telcordia Technologies document GR-253-CORE (Section 4.3) and International Telecommunications Union (ITU) document G.957.
When chromatic dispersion is at the maximum allowed, its effect can be considered as a power penalty in the power budget. The optical power budget must allow for the sum of component attenuation, power penalties (including those from dispersion), and a safety margin for unexpected losses.

65
MX204 Management and Console Port Specifications and Pinouts
IN THIS SECTION RJ-45 Connector Pinouts for MX Series CB-RE or RCB Auxillary and Console Ports | 65 RJ-45 Connector Pinouts for an MX Series CB-RE or RCB Management Port | 66

RJ-45 Connector Pinouts for MX Series CB-RE or RCB Auxillary and Console Ports
The ports�labeled--AUX and CONSOLE--on the Control Board and Routing Engine (CB-RE) or the Routing and Control Board (RCB) are asynchronous serial interfaces that accept an RJ-45 connector. The ports connect the Routing Engine to an auxiliary or console management device. Table 24 on page 65 describes the RJ-45 connector pinout.
NOTE: In routers where the Routing Engine and Control Board (CB) are integrated into a single board, a CB-RE is known as Routing and Control Board (RCB). The RCB is a single FRU that provides Routing Engine and CB functionality.

Table 24: RJ-45 Connector Pinout for the AUX and CONSOLE Ports

Signal

Description

RTS

Request to Send

DTR

Data Terminal Ready

TXD

Transmit Data

Ground

Signal Ground

Ground

Signal Ground

RXD

Receive Data

Table 24: RJ-45 Connector Pinout for the AUX and CONSOLE Ports (continued)

Signal

Description

DSR/DCD

Data Set Ready

CTS

Clear to Send

RJ-45 Connector Pinouts for an MX Series CB-RE or RCB Management Port
The port on the Control Board and Routing Engine (CB-RE; Routing and Control Board (RCB)) labeled MGMT is an autosensing 10/100/1000-Mbps Ethernet RJ-45 receptacle that accepts an Ethernet cable for connecting the Routing Engine to a management LAN (or other device that supports out-of-band management).
NOTE: In routers where the Routing Engine and Control Board (CB) are integrated into a single board, a CB-RE is known as Routing and Control Board (RCB). The RCB is a single FRU that provides Routing Engine and CB functionality.

Table 25 on page 66 describes the RJ-45 connector pinout.

Table 25: RJ-45 Management Port Connector Pinouts for the CB-RE or RCB MGMT Port

Signal

Description

TRP1+

Transmit/receive data pair 1

TRP1�

Transmit/receive data pair 1

TRP2+

Transmit/receive data pair 2

TRP3+

Transmit/receive data pair 3

TRP3�

Transmit/receive data pair 3

TRP2�

Transmit/receive data pair 2

TRP4+

Transmit/receive data pair 4

Table 25: RJ-45 Management Port Connector Pinouts for the CB-RE or RCB MGMT Port (continued)

Signal

Description

TRP4�

Transmit/receive data pair 4

MX204 Power Planning

IN THIS SECTION
Power Consumption for an AC-Powered MX204 Router | 67 Power Consumption for a DC-Powered MX204 Router | 69

Power Consumption for an AC-Powered MX204 Router

Use the information in this topic to determine the power consumption for your router and plan the amount of power you need to provide to the router.
� Power Requirements for MX204 Components on page 67 � Calculating System Thermal Output on page 68

Power Requirements for MX204 Components

Table 26 on page 67 lists the power requirements for various hardware components when the router is operating under typical and maximum voltage conditions.

Table 26: Power Requirements for MX204 Components

Component

Power Requirement at 25� C (Watts; Typical)

Power Requirement at 55� C (Watts; Maximum)

Fully loaded MX204 router

240 W

280 W

Table 27 on page 68 lists the power requirements for the fully configured AC-powered routers operating under typical voltage conditions.

Table 27: MX204 Router AC Router Power Requirements at Typical Temperature (25� C)

Chassis Configuration

Power Requirement at 25� C (Watts)

Power Requirement (Watts) with 90% Efficiency

Fully configured chassis running at high activity 240 W

266 W

Table 28 on page 68 lists the power requirements for the fully configured AC-powered routers operating under maximum voltage conditions.

Table 28: MX204 Router AC Router Power Requirements at Maximum Temperature (55� C)

Chassis Configuration

Power Requirement at 55� C (Watts)

Power Requirement (Watts) with 90% Efficiency

Fully configured chassis running at high activity 280 W

311 W

Calculating System Thermal Output
After you have calculated the power consumption for your configuration, you can use that information to determine the system thermal output (BTUs per hour). To do so, multiply the power consumption in watts by 3.41.
For example, in Table 27 on page 68 we calculated the power consumption for a fully configured chassis running at high activity at 25� C typical temperature to be 240 W. Using that information we can calculate the system thermal output for the configuration:
Power consumption in watts * 3.41 = system thermal output in BTU/hr 240 W * 3.41 = 818.4 BTU/hr

SEE ALSO
MX204 Power System Description | 30 Replacing an MX204 AC Power Supply | 126 AC Power Cord Specifications for MX204 Routers | 37 AC Power Circuit Breaker Requirements for the MX204 Router | 36

69
General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173

Power Consumption for a DC-Powered MX204 Router

Power Requirements for MX204 Components

Table 29 on page 69 lists the power requirements for various hardware components when the router is operating under typical and maximum voltage conditions.

Table 29: Power Requirements for MX204 Components

Component

Power Requirement at 25� C (Watts; Typical)

Power Requirement at 55� C (Watts; Maximum)

Fully loaded MX204 router

240 W

280 W

Table 30 on page 69 lists the power requirements for the fully configured DC-powered routers operating under typical voltage conditions.

Table 30: MX204 Router DC Router Power Requirements at Typical Temperature (25� C)

Chassis Configuration

Power Requirement at 25� C (Watts)

Power Requirement (Watts) with 90% Efficiency

Fully configured chassis running at high activity 240 W

266 W

Table 31 on page 70 lists the power requirements for the fully configured DC-powered routers operating under maximum voltage conditions.

Table 31: MX204 Router DC Router Power Requirements at Maximum Temperature (55� C)

Chassis Configuration

Power Requirement at 55� C (Watts)

Power Requirement (Watts) with 90% Efficiency

Fully configured chassis running at high activity 280 W

311 W

Calculating System Thermal Output
After you have calculated the power consumption for your configuration, you can use that information to determine the system thermal output (BTUs per hour). To do so, multiply the power consumption in watts by 3.41.
For example, in Table 30 on page 69 we calculated the power consumption for a fully configured chassis running at high activity at 25� C typical temperature to be 240 W. Using that information we can calculate the system thermal output for the configuration:
Power consumption in watts * 3.41 = system thermal output in BTU/hr 240 W * 3.41 = 818.4 BTU/hr

SEE ALSO
MX204 Power System Description | 30 Replacing an MX204 DC Power Supply | 128 DC Power Circuit Breaker Requirements for the MX204 Router | 40 DC Power Source Cabling for MX204 Router | 41 DC Power Cable Specifications for MX204 Router | 42 General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173

72
MX204 Installation Overview
To install the router: 1. Prepare your installation site.
See "MX204 Site Preparation Checklist" on page 50.
2. Review the safety guidelines and warnings: � See "General Safety Guidelines and Warnings" on page 145. � See "General Safety Warnings for Juniper Networks Devices" on page 146.
3. Unpack the router and verify the parts: a. See "Unpacking MX204 Router" on page 74.
b. See "Verifying the MX204 Router Parts Received" on page 75.
4. (Optional) Remove components from the MX204 router chassis before Installing It in a rack. See individual topics listed in Removing, Installing, and Upgrading Components for removing components.
5. Install the router in the rack. See "Installing the MX204 Chassis in a Rack" on page 77.
6. (Optional; Required only if you have removed the components from the router in step 4) Reinstall components in the MX204 router after installing the chassis in a rack. See individual topics listed in Removing, Installing, and Upgrading Components for installing components.
7. Connect cables to the network and external devices. See "Connecting the MX204 Router to External Devices and Cables" on page 96.
8. Connect the grounding cable. See "Grounding the MX204 Router" on page 85.
9. Connect the AC power cord or DC power cables: � See "Connecting Power to an AC-Powered MX204 Router" on page 86. � See "Connecting Power to a DC-Powered MX204 Router" on page 90.
10. Power on the router:

73
� See "Powering On an AC-Powered MX204 Router" on page 89. � See "Powering On a DC-Powered MX204 Router" on page 93. 11. Perform the initial system configuration. See "Performing the Initial Software Configuration for the MX204 Router" on page 103.
RELATED DOCUMENTATION MX204 Router Rack Requirements | 58 MX204 Router Clearance Requirements for Airflow and Hardware Maintenance | 57 MX204 Router Cabinet Requirements and Specifications | 55
Unpacking the MX204
IN THIS SECTION Tools and Parts Required to Unpack the MX204 Router | 73 Unpacking MX204 Router | 74 Verifying the MX204 Router Parts Received | 75
Tools and Parts Required to Unpack the MX204 Router
To unpack the router and prepare for installation, you need the following tools: � Phillips (+) screwdriver, number 2 � 1/2-in. or 13-mm open-end or socket wrench to remove bracket bolts from the shipping pallet
SEE ALSO MX204 Chassis Description | 20 MX204 Field-Replaceable Units | 23

74
Unpacking MX204 Router | 74
Unpacking MX204 Router
The router is shipped in a cardboard carton and secured with foam packing material. The carton also contains an accessory box and quick start instructions.
NOTE: The router is maximally protected inside the shipping carton. Do not unpack it until you are ready to begin installation.
To unpack the router: 1. Move the shipping carton to a staging area as close to the installation site as possible, but where you
have enough room to remove the router. 2. Position the carton so that the arrows are pointing up. 3. Open the top flaps on the shipping carton. 4. Remove the accessory box, and verify the contents against the parts inventory on the label attached
to the carton. 5. Pull out the packing material holding the router in place. 6. Verify the contents of the carton against the packing list included with the router. 7. Save the shipping carton and packing materials in case you later need to move or ship the router.
SEE ALSO MX204 Site Preparation Checklist | 50

Verifying the MX204 Router Parts Received

A packing list is included in each shipment. Check the parts in the shipment against the items on the packing list. The packing list specifies the part numbers and descriptions of each part in your order.

If any part is missing, contact a customer service representative.

A fully configured router contains the router chassis with installed components, listed in Table 32 on page 75, and an accessory box, which contains the parts listed in Table 33 on page 75. The parts shipped with your router can vary depending on the configuration you ordered.

Table 32: Parts List for a Fully Configured Router

Component

Quantity

Chassis

AC or DC power supply

Fan module

Documentation Roadmap and Product Warranty

Blank panels for slots without components installed One blank panel for each slot not occupied by a component

Rack mount kit

Philips M4x7mm flat head screws

Table 33: Accessory Box Parts List Part

Quantity

Screws to mount chassis

Screws to secure the ground cable lug

DC power ring terminal lugs, 14 - 16 AWG, sized for 8 #6 screw

Label, "Small Parts Enclosed"

Label, "Accessories Contents"

Table 33: Accessory Box Parts List (continued) Part

Quantity

USB flash drive with Junos OS

Read me first document

Affidavit for T1 connection

Juniper Networks Product Warranty

End User License Agreement

Document sleeve

3 in. x 5 in. pink bag

9 in. x 12 in. pink bag, ESD

Accessory box, 19 in. x 12 in. x 3 in.

Ethernet cable, RJ-45 to DB-9

ESD wrist strap with cable

ETSI brackets

SEE ALSO MX204 Site Preparation Checklist | 50
Installing the MX204

IN THIS SECTION
Tools Required to Install the MX204 Chassis in Rack | 77 Installing the MX204 Chassis in a Rack | 77

77
Tools Required to Install the MX204 Chassis in Rack
To install the router, you need the following tools and parts: � Phillips (+) screwdriver, number 2 � ESD grounding wrist strap � Blank panels to cover any slots not occupied by a component � Mounting brackets, supplied with the router � Sixteen screws for securing the mounting brackets to the chassis, supplied with therouter � Four mounting screws, supplied with the router
SEE ALSO MX204 Site Preparation Checklist | 50
Installing the MX204 Chassis in a Rack
IN THIS SECTION Installing the MX204 Chassis in a 19-in. Rack | 78 Installing the MX204 in a 21-in. ETSI Rack | 80

78
CAUTION: � If you are installing more than one router in a rack, install the lowest one first.
Installing a router in an upper position in a rack or cabinet requires a lift. � Before front-mounting the router in a rack, have a qualified technician verify that
the rack is strong enough to support the router's weight and is adequately supported at the installation site. � Lifting the chassis and mounting it in a rack requires two people (one person to hold the router in place and a second person to install the screws). The fully loaded chassis weighs approximately 22.7 lb (10.3 kg).
The MX204 router is designed for installation in a rack that complies with either of the following standards: � 19-in. rack--A 19-in. (450 mm) rack as defined in Cabinets, Racks, Panels, and Associated Equipment
(document number EIA-310-D) published by the Electronics Industry Association (http://www.ecianow.org/). � ETSI rack--A 21-in. (500 mm) ETSI rack as defined in the European Telecommunications Standards Institute (ETS 300 119) published by the European Telecommunications Standards Institute (ETSI). Based on the rack, follow the steps mentioned on the below topics to install the router:
Installing the MX204 Chassis in a 19-in. Rack
To install the router in a 19-in. rack or cabinet: 1. Position the router in front of the rack or cabinet.
2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and to a site ESD point.
3. Align the holes in the front mounting brackets with the holes on the side of the chassis (see Figure 20 on page 78).
Figure 20: Attaching the Mounting Brackets

g100049

g009889

79 4. Using a Phillips (+) number 2 screwdriver, secure the mounting brackets to the router using the mounting
screws. 5. With one person on each side, hold on to the bottom of the chassis and carefully lift it so that the
mounting brackets contact the rack rails. 6. Carefully slide the router onto the mounting brackets until the front-mounting brackets attached to
the chassis contact the rack rails (see Figure 21 on page 79). Figure 21: Installing the Router in a Four-Post Rack
7. Install mounting screws into each of the open front-mounting holes aligned with the rack, starting from the bottom, and secure them tightly. Figure 22 on page 79 shows the router fully secured to the front rails of the four-post rack.
Figure 22: Router Secured by Front-Mounting Brackets
8. On the rear of the chassis, slide the rear-mounting brackets on either side of the chassis until the rear-mounting brackets contact the rack rails (see Figure 23 on page 80). The rear-mounting brackets on each side of the chassis are movable. You can adjust the brackets according to the depth of the rack.

g009890

g009891

80 Figure 23: Installing the Rear-Mounting Brackets
9. Install mounting screws into each of the open rear-mounting holes aligned with the rack, starting from the bottom, and secure them tightly.
10. Visually inspect the alignment of the chassis. If the chassis is installed properly in the rack, all the mounting screws on one side of the rack are aligned with the mounting screws on the opposite side and the router is level. Figure 24 on page 80 shows the router fully secured and installed in a four-post rack.
Figure 24: Router Installed in the Rack
Installing the MX204 in a 21-in. ETSI Rack The ETSI racks are little wider than the standard 19-in. rack. To install the router in an ETSI rack, you need to install the ETSI brackets on to the router. Figure 25 on page 81 shows the ETSI brackets supported by MX204 router.

g009892

g009499

81 Figure 25: ETSI Brackets
To install the router in a 21-in. ETSI rack or cabinet: 1. Position the router in front of the rack or cabinet. 2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist and to a site ESD point. 3. Align the holes in the front mounting brackets with the holes on the side of the chassis (see
Figure 26 on page 81). Figure 26: Attaching the Mounting Brackets
4. Install the two front ETSI brackets on the front-mounting brackets on each side of the chassis (see Figure 27 on page 81).
Figure 27: Installing the Front ETSI Brackets
5. With one person on each side, hold on to the bottom of the chassis and carefully lift it so that the mounting brackets contact the rack rails.
6. Carefully slide the router onto the mounting brackets until the front-mounting brackets attached to the chassis contact the rack rails (see Figure 28 on page 82).

g100049

g0 0 9886

g009545

82 Figure 28: Installing the Router in a Four-Post Rack
7. Install mounting screws into each of the open front-mounting holes aligned with the rack, starting from the bottom, and secure them tightly. Figure 29 on page 82 shows the router fully secured to the front rails of the four-post rack.
Figure 29: Router Secured by Front-Mounting Brackets with ETSI Brackets
8. Install the two rear ETSI brackets on the rear-mounting brackets (see Figure 30 on page 82). The rear-mounting brackets on each side of the chassis are movable. You can adjust the brackets according to the depth of the rack.
Figure 30: Installing the Rear ETSI Brackets
9. On the rear of the chassis, slide the rear-mounting brackets (with the ETSI brackets installed) on either side of the chassis until the rear-mounting brackets contact the rack rails (see Figure 31 on page 83).

g009546

g009898

g009899

83 Figure 31: Installing the Rear-Mounting Brackets with ETSI Brackets
10. Install mounting screws into each of the open rear-mounting holes aligned with the rack, starting from the bottom, and secure them tightly.
11. Visually inspect the alignment of the chassis. If the chassis is installed properly in the rack, all the mounting screws on one side of the rack are aligned with the mounting screws on the opposite side and the router is level. Figure 32 on page 83 shows the router fully secured and installed in a four-post rack with ETSI brackets.
Figure 32: Router Installed in the Rack with ETSI Brackets
SEE ALSO MX204 Site Preparation Checklist | 50 MX204 Router Grounding Specifications | 54 MX204 Router Clearance Requirements for Airflow and Hardware Maintenance | 57

g009885

84
Connecting the MX204 to Power
IN THIS SECTION Tools and Parts Required for MX204 Router Grounding and Power Connections | 84 Grounding the MX204 Router | 85 Connecting Power to an AC-Powered MX204 Router | 86 Powering On an AC-Powered MX204 Router | 89 Connecting Power to a DC-Powered MX204 Router | 90 Powering On a DC-Powered MX204 Router | 93 Powering Off the MX204 Router | 94
Tools and Parts Required for MX204 Router Grounding and Power Connections
To ground and provide power to the router, you need the following tools and parts: � Phillips (+) screwdrivers, numbers 1 and 2 � Socket nut driver � 2.5-mm flat-blade (�) screwdriver � Torque-controlled driver, with a maximum torque capacity of 6 lb-in. (0.7 Nm), for tightening screws to
terminals on each power supply on a DC-powered router
CAUTION: The maximum torque rating of the terminal screws on the DC power supply is 6 lb-in. (0.7 Nm). The terminal screws might be damaged if excessive torque is applied. Use only a torque-controlled driver to tighten screws on the DC power supply terminals. Use an appropriately sized driver, with a maximum torque capacity of 6 lb-in. or less. Ensure that the driver is undamaged and properly calibrated and that you have been trained in its use. You might want to use a driver that is designed to prevent overtorque when the preset torque level is achieved.
� Wire cutters � Electrostatic discharge (ESD) grounding wrist strap

85
SEE ALSO MX204 Router Grounding Specifications | 54 General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173
Grounding the MX204 Router
You ground the router by connecting a grounding cable to earth ground and then attaching it to the chassis grounding points by using two 10�32 screws. Figure 33 on page 85 shows the grounding point location on the chassis. You must provide the grounding cables (the cable lugs are supplied with the router). For grounding cable specifications, see "MX204 Router Grounding Specifications" on page 54.
Figure 33: Grounding Point on the MX204 Router
1
Rear panel
1--Grounding point To ground the router: 1. Verify that a licensed electrician has attached the cable lug provided with the router to the grounding
cable. 2. Attach an electrostatic discharge (ESD) grounding strap to your bare wrist, and connect the strap to
an approved site ESD grounding point. See the instructions for your site. 3. Ensure that all grounding surfaces are clean and brought to a bright finish before grounding connections
are made. 4. Connect the grounding cable to a proper earth ground. 5. Detach the ESD grounding strap from the site ESD grounding point.

g009882

g009884

86 6. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on
the chassis. 7. Place the grounding cable lug over the grounding point on the chassis. 8. Secure the grounding cable lug with the screws. The holes are sized for 10�32 screws (see
Figure 34 on page 86). 9. Dress the grounding cable, and verify that it does not touch or block access to router components, and
that it does not drape where people could trip on it. Figure 34: Connecting Grounding Lug to the MX204 Router
SEE ALSO General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173
Connecting Power to an AC-Powered MX204 Router
CAUTION: Do not mix AC and DC power supply modules within the same router. Damage to the router might occur.
You connect AC power to the router by attaching power cords from the AC power sources to the AC appliance inlets located on the power supply modules. To connect the AC power cords to the router for each power supply module:

87
1. Locate power cords that have a plug appropriate for your geographic location. For more information, see "AC Power Cord Specifications for MX204 Routers" on page 37.
2. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
3. Power off the AC input appliance inlet on the source power supply.
4. Connect the power cord to the power supply source.
NOTE: Each power supply must be connected to a dedicated AC power feed and a dedicated customer-site circuit breaker. We recommend that you use a dedicated customer-site circuit breaker rated for 20 A (110 VAC) or 16 A (220 VAC) minimum, or as required by local code.
5. Push the end of the AC power cord retainer strip into the hole next to the inlet on the power supply face plate on the router until it snaps into place. Ensure that the loop in the retainer strip faces toward the power cord. Figure 35 on page 87 shows the port on the AC power supply module where the power cord retainer is installed.
Figure 35: Power Cord Retainer Port on the AC Power Supply Module

g100048

1--Input status LED 2--Output status LED 3--Fault LED

4--Ejector lever 5--AC power cord retainer port

Figure 36 on page 88 shows the power cord retainer installed on the AC power supply module.

88 Figure 36: Power Cord Retainer Installed on the AC Power Supply Module

g009866

1--Input status LED 2--Output status LED 3--Fault LED

4--AC power cord retainer installed 5--Ejector lever

6. Press the small tab on the retainer strip to loosen the loop. Slide the loop until you have enough space to insert the power cord coupler into the inlet.
7. Insert the power cord coupler firmly into the inlet. 8. Slide the loop toward the power supply until it is snug against the base of the coupler. 9. Press the tab on the loop and draw out the loop into a tight circle (see Figure 37 on page 88). 10. Route the power cord appropriately. Verify that the power cord does not block the air exhaust and
access to router components, or drape where people could trip on it. 11. Power on the power supply at source. 12. Repeat Step 1 through Step 10 for the installing the remaining power supply.

Figure 37: Connecting AC Power to the Router

g009870

89
SEE ALSO MX204 Router Grounding Specifications | 54 General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173
Powering On an AC-Powered MX204 Router
To power on an AC-powered router: 1. Verify that the power supply modules are fully inserted in the chassis.
2. Verify that each AC power cord is securely inserted into its appliance inlet.
3. Verify that an external management device is connected to the CON port on the chassis.
4. Turn on power to the external management device.
5. Switch on the dedicated customer-site circuit breakers for the power supply modules. Follow the instructions for your site.
6. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on the chassis.
7. Observe the status LED on each power supply faceplate. If an AC power supply is correctly installed and functioning normally, the status LED on the router beside the AC power supply lights steadily green. If the status LED on the power supply is lit red, the power supply is not functioning normally. Repeat the installation and cabling procedures.

90
NOTE: After powering off a power supply, wait at least 60 seconds before turning it back on. After powering on a power supply, wait at least 60 seconds before turning it off. If the system is completely powered off when you power on the power supply, the Routing Engine (or RCB) boots as the power supply completes its startup sequence. If the Routing Engine finishes booting and you need to power off the system again, first issue the CLI request system halt command. After a power supply is powered on, it can take up to 60 seconds for status indicators--such as the status LEDs on the power supply and the show chassis command display--to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.
8. On the external management device connected to the Routing Engine, monitor the startup process to verify that the system has booted properly.
SEE ALSO MX204 Router Grounding Specifications | 54 request system halt show chassis power General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173
Connecting Power to a DC-Powered MX204 Router
CAUTION: Do not mix AC and DC power supply modules within the same router. Damage to the router might occur.

91
WARNING: Before performing DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.
You connect DC power to the router by attaching power cables from the external DC power sources to the terminal on the power supply faceplate. You must provide the power cables (the cable lugs are supplied with the router). For power cable specifications, see "DC Power Cable Specifications for MX204 Router" on page 42. To connect the DC source power cables to the router for each power supply: 1. Switch off the dedicated customer-site circuit breakers. Ensure that the voltage across the DC power
source cable leads is 0 V and that there is no chance that the cable leads might become active during installation.
2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to an ESD point.
3. Verify that the DC power cables are correctly labeled before making connections to the power supply. In a typical power distribution scheme where the return is connected to chassis ground at the battery plant, you can use a multimeter to verify the resistance of the �48V and RTN DC cables to chassis ground: � The cable with very large resistance (indicating an open circuit) to chassis ground is �48V. � The cable with very low resistance (indicating a closed circuit) to chassis ground is RTN.
CAUTION: You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (�) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.
4. Remove the screws from the terminals.
5. Secure each power cable lug to the terminal with the screws (see Figure 38 on page 92). Apply between 5 lb-in. (0.6 Nm) and 6 lb-in. (0.7 Nm) of torque to the screws. Do not overtighten the screws. (Use a socket nut driver.) a. Secure the positive (+) DC source power cable lug to the RTN (return) terminal.

92 b. Secure the negative (�) DC source power cable lug to the �48V (input) terminal.
CAUTION: Ensure that each power cable lug seats flush against the surface of the terminal block as you are tightening the screws. Ensure that each nut is properly threaded into the terminal. Applying installation torque to the screws when improperly threaded can result in damage to the terminal.
CAUTION: You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (�) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.
NOTE: For information about connecting to DC power sources, see "MX204 Router DC Power Specifications" on page 39.
6. Verify that the power cables are connected correctly, that they do not touch or block access to router components, and that they do not drape where people could trip on them.
7. Repeat Step 1 through Step 6 for installing the other power supply modules. Figure 38: Connecting DC Power to the Router
SEE ALSO MX204 Router Grounding Specifications | 54 General Safety Guidelines and Warnings | 145

g009875

93
General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173
Powering On a DC-Powered MX204 Router
To power on a DC-powered router: 1. Verify that an external management device is connected to the CON port on the chassis.
2. Turn on power to the external management device.
3. Verify that the power supply modules are fully inserted in the chassis.
4. Verify that the source power cables are connected to the appropriate terminal: the positive (+) source cable to the return terminal (labeled RTN) and the negative (�) source cable to the input terminal (labeled �48V).
5. Switch on the dedicated customer-site circuit breakers to provide power to the DC power cables.
6. Check that the status LED on the power supply faceplate is lit steadily green to verify that power is present.
7. If power is not present: � Verify that the fuse is installed correctly, and turn on the breaker at the battery distribution fuse board or fuse bay. � Check the voltage with a meter at the terminals of the power supply for correct voltage level and polarity.
8. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to an ESD point.
9. Observe the status LED on each power supply faceplate. If a DC power supply is correctly installed and functioning normally, the status LED lights green steadily. If the status LED on the power supply is unlit, the power supply is not functioning normally. Repeat the installation and cabling procedures.

94
NOTE: After powering off a power supply, wait at least 60 seconds before turning it back on. After powering on a power supply, wait at least 60 seconds before turning it off. If the system is completely powered off when you power on the power supply, the Routing Engine (or RCB) boots as the power supply completes its startup sequence. If the Routing Engine finishes booting and you need to power off the system again, first issue the CLI request system halt command. After a power supply is powered on, it can take up to 60 seconds for status indicators--such as the status LEDs on the power supply and the show chassis command display--to indicate that the power supply is functioning normally. Ignore error indicators that appear during the first 60 seconds.
10. On the external management device connected to the Routing Engine, monitor the startup process to verify that the system has booted properly.
SEE ALSO MX204 Router Grounding Specifications | 54 request system halt show chassis power General Safety Guidelines and Warnings | 145 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173
Powering Off the MX204 Router
Before you power off an MX204: � Ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage.
See "Prevention of Electrostatic Discharge Damage" on page 173. � Ensure that you do not need to route traffic through the MX204. � Ensure that you have the following parts and tools available to power off the MX204:
� An ESD grounding strap � An external management device such as a PC

95
� An RJ-45 to DB-9 rollover cable to connect the external management device to the console port
NOTE: After powering off a power supply, wait at least 60 seconds before turning it back on.
To power off the router: 1. Connect a management device to the console (see "Connecting the MX204 Router to External Devices
and Cables" on page 96).
2. On the external management device connected to the Routing Engine, issue the request system halt command. user@host> request vmhost halt Halt the system ? [yes,no] (no) yes You see the following output (or something similar) after entering the command:
Initiating vmhost halt... ok Initiating Junos shutdown... shutdown: [pid 14318] Shutdown NOW! ok Junos shutdown is in progress... *** FINAL System shutdown message ***
System going down IMMEDIATELY
... ... Operating system halted. Please press any key to reboot.
3. Wait until a message appears on the console confirming that the operating system has halted. For more information about the command, see the CLI Explorer.
4. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to an ESD point.
5. Switch off the power supply source.

96 SEE ALSO
request vmhost halt
Connecting the MX204 to the Network
IN THIS SECTION Tools and Parts Required to Connect the MX204 Router to External Devices | 96 Connecting the MX204 Router to External Devices and Cables | 96
Tools and Parts Required to Connect the MX204 Router to External Devices
To connect the router to external devices, you need the following tools and parts: � 2.5-mm flat-blade (�) screwdriver for the alarm relay contacts � Electrostatic discharge (ESD) grounding wrist strap (provided in the accessory kit)
SEE ALSO Verifying the MX204 Router Parts Received | 75 Prevention of Electrostatic Discharge Damage | 173
Connecting the MX204 Router to External Devices and Cables
IN THIS SECTION Connecting the Router to a Network for Out-of-Band Management | 97 Connecting the Router to a Console Device | 98 Connecting the Router to External Clocking and Timing Devices | 100

Figure 39 on page 97 shows the front panel of the MX204 router. All the connections to the router are made through the front panel.

Figure 39: MX204 Front Panel Ports, LEDs and Buttons

4 5 6 78

g009897

14 13

12 11 10 9

1--Rate-selectable ports 2--Management (MGMT) port 3--BITS port with LEDs 4--USB port 5--1PPS and 10MHz GPS input and output ports 6--ONLINE LED 7--SSD1 LED 8--OFFLINE button

9--RESET button 10--SSD0 LED 11--Alarm (ALM) LED 12--OK/FAIL LED 13--Time of day (ToD) port with LEDs 14--Console (CON) port 15--10-Gigabit Ethernet SFP+ ports 16--PTP grandmaster clock (GM/PTP) port

Connecting the Router to a Network for Out-of-Band Management
To connect the router to a network for out-of-band management, connect an Ethernet cable with RJ-45 connectors to the MGMT port on the router. One Ethernet cable is provided with the router.

NOTE: Use shielded CAT5e cable for the CON and MGMT ports on the chassis.

To connect to the MGMT port on the router faceplate: 1. Turn off power to the management device.
2. Plug one end of the Ethernet cable (Figure 40 on page 98 shows the connector) into the MGMT port on the router.
3. Plug the other end of the cable into the network device.

98 Figure 40: Out-of-Band Management Cable Connector

Table 34: Out-of-Band Management Port on the MX204 Router

Callout

Label

Description

2 (See Figure 39 on page 97)

MGMT

Dedicated management channel for device maintenance. It is also used by system administrators to monitor and manage the router remotely.

Connecting the Router to a Console Device
To use a system console to configure and manage the router, connect it to the appropriate CON port on the router. The console port is used to connect a laptop or console terminal to configure the router (see Figure 42 on page 99 and Figure 43 on page 99). The console port accepts a cable with an RJ-45 connector. One serial cable with an RJ-45 connector and a DB-9 connector is provided with the router.
NOTE: Use shielded CAT5e cable for connecting the CON and MGMT ports on the MX204 router.

To connect a management console: 1. Turn off power to the console device. 2. Plug the RJ-45 end of the serial cable (see Figure 41 on page 99) into the CON port on the router. 3. Plug the socket DB-9 end into the device's serial port.

99
NOTE: For console devices, configure the serial port to the following values: � Baud rate--9600 � Parity--N � Data bits--8 � Stop bits--1 � Flow control--none
Figure 41: Console and Auxiliary Cable Connector

Figure 42: Connecting the MX204 Router to a Management Console Through a Console Server

To Console Port

Console Server

Figure 43: Connecting the MX204 Router Directly to a Management Console

g020570 g020547

To Console port

Table 35: Console Port on the MX204 Router

Callout

Label

14 (See Figure 39 on page 97)

CON

Description
Connect a laptop or console terminal to configure the router.

100
Connecting the Router to External Clocking and Timing Devices
IN THIS SECTION Connecting 1-PPS and 10-MHz Timing Devices to the Router | 100 Connecting a Time-of-Day Device to the Router | 101 Connecting a BITS External Clocking Device to the Router | 102
The router supports external clock synchronization for Synchronous Ethernet, and external inputs. Connecting 1-PPS and 10-MHz Timing Devices to the Router The router has two 2x1 DIN 1.0/2.3 right angle connectors that support 1-PPS-IN, 1-PPS-OUT, 10-MHz-IN, and 10-MHz-OUT timing ports.
NOTE: MX204 can be configured as a timing primary or a client device. If the MX204 is configured as a timing primary device, the router gets 1-PPS-IN and 10-MHz-IN input (connected to the ports marked IN) from the timing source and sends 1-PPS-OUT and 10-MHz-OUT to a client device. If the MX204 is configured as a timing client device, it receives 1-PPS-IN and 10-MHz-IN (connected to ports marked IN) as input from the timing source.
NOTE: Ensure a cable of 3 m or less in length is used for the 10-MHz and 1-PPS connectors.
To connect the DIN cable to the external clocking device: 1. Connect one end of the DIN cable connectors to the 1-PPS-IN and the 10-MHz-IN ports marked IN
on the router. If the MX204 is a timing primary device, use the 1-PPS-OUT and the 10-MHz-OUT ports marked OUT to connect to a client router or device.
2. Connect the other end of the DIN cable connectors to the 1-PPS and 10-MHz of the source network equipment.

101
NOTE: Ensure that the 10-MHz and 1-PPS source network equipment contains a low voltage complementary metal oxide semiconductor (LVCMOS) of 50 ohms or is compatible with low-voltage transistor-transistor logic (LVTTL) (3.3v).
Figure 44: Clocking Ports on the MX204 Router

g100549

Table 36: Clocking Ports on the MX204 Router

Label

Description

10MHz-IN 1PPS-IN

1 PPS input port 10 MHz input port

10MHz-OUT 1PPS-OUT

1 PPS output port 10 MHz output port

Connecting a Time-of-Day Device to the Router A time-of-day port, labeled ToD, on the front panel of the router enables you to connect external timing devices.
To connect the router to a ToD external timing device:
1. Attach an electrostatic discharge (ESD) grounding trap on your bare wrist, and connect the strap to one of the ESD points on the chassis.

2. Plug one end of the RJ-45 cable into the ToD port on the front panel of the router.

3. Plug the other end of the RJ-45 cable into the ToD timing device.

102

4. Verify that the LEDs for the ToD port on the router are lit steadily green.

5. Configure the port. See Configuring Clock Synchronization Interface on MX Series Routers.

Table 37: Time-of-Day Port on the MX204 Router

Callout

Label

Description

ToD

(See Figure 39 on page 97)

ToD RJ-45 port with LED.

Connecting a BITS External Clocking Device to the Router The router has an external building-integrated timing supply (BITS) port, labeled BITS, on the front panel of the router.
To connect the router to a BITS external clocking device:
1. Attach an electrostatic discharge (ESD) grounding trap on your bare wrist, and connect the strap to one of the ESD points on the chassis.

2. Plug one end of the RJ-45 cable into the internal clock port on the craft interface.

3. Plug the other end of the RJ-45 cable into the BITS external clocking device.

4. Verify that the LEDs for the BITS port are lit steadily green.

5. Configure the port. See Configuring Clock Synchronization Interface on MX Series Routers.

Table 38: BITS Port on the MX204 Router

Callout

Label

3 (See Figure 39 on page 97)

BITS

Description
Building-Integrated Timing Supply (BITS) clock interface port with LED.

SEE ALSO
MX204 Routing Engine Description | 43 Prevention of Electrostatic Discharge Damage | 173

103
Performing the Initial Software Configuration for the MX204 Router
The router is shipped with the Junos operating system (OS) preinstalled and ready to be configured when the router is powered on. Two 16-MB internal NAND Flash memory devices are located on the baseboard for BIOS storage. The USB storage device can be inserted into the USB slot on the chassis faceplate. The router also supports two built-in M.2-based solid-state drive (SSD) slots. These two SSD devices act as the primary boot devices (SSD0 and SSD1). When the router boots, it first attempts to start the Junos OS image on the USB flash drive if it detects one. If a USB flash drive is not inserted into the router, or the attempt otherwise fails, the router next tries the primary boot device, and then tries the secondary boot device. You configure the router by issuing Junos OS command-line interface (CLI) commands, either on a console device attached to the CON port on the front panel, or over a Telnet connection to a network connected to the MGMT port on the front panel. Gather the following information before configuring the router: � Name the router will use on the network � Domain name the router will use � IP address and prefix length information for the Ethernet interface � IP address of a default router � IP address of a DNS server � Password for the root user This procedure connects the router to the network but does not enable it to forward traffic. For complete information about enabling the router to forward traffic, including examples, see the Junos OS configuration guides. To configure the software: 1. Verify that the router is powered on.
2. Log in as the "root" user. There is no password.
3. Start the CLI. For more information about CLI commands, see the CLI Explorer.
root# cli root@>

104
4. Enter configuration mode. cli> configure [edit] root@#
5. Configure the name of the router. If the name includes spaces, enclose the name in quotation marks (" "). [edit] root@# set system host-name host-name
6. Create a management console user account. [edit] root@# set system login user user-name authentication plain-text-password New password: password Retype new password: password
7. Set the user account class to super-user. [edit] root@# set system login user user-name class super-user
8. Configure the router's domain name. [edit] root@# set system domain-name domain-name
9. Configure the IP address and prefix length for the router's Ethernet interface. [edit] root@# set interfaces fxp0 unit 0 family inet address address/prefix-length
10. Configure the IP address of a backup router, which is used only while the routing protocol is not running. [edit] root@# set system backup-router address

105
11. Configure the IP address of a DNS server.
[edit] root@# set system name-server address
12. Set the root authentication password by entering either a cleartext password, an encrypted password, or an SSH public key string (DSA or RSA).
[edit] root@# set system root-authentication plain-text-password New password: password Retype new password: password
or
[edit] root@# set system root-authentication encrypted-password encrypted-password
or
[edit] root@# set system root-authentication ssh-dsa public-key
or
[edit] root@# set system root-authentication ssh-rsa public-key
13. (Optional) Configure the static routes to remote subnets with access to the management port. Access to the management port is limited to the local subnet. To access the management port from a remote subnet, you need to add a static route to that subnet within the routing table. For more information about static routes, see the Junos OS Administration Library.
[edit] root@# set routing-options static route remote-subnet next-hop destination-IP retain no-readvertise
14. Configure the Telnet service at the [edit system services] hierarchy level.
[edit] root@# set system services telnet

106
15. (Optional) Display the configuration to verify that it is correct.
[edit] root@# show system {
host-name host-name; domain-name domain-name; backup-router address; root-authentication {
authentication-method (password | public-key); } name-server {
address; } } interfaces { fxp0 {
unit 0 { family inet { address address/prefix-length; }
} } }
16. Commit the configuration to activate it on the router.
[edit] root@# commit
17. (Optional) Configure additional properties by adding the necessary configuration statements. Then commit the changes to activate them on the router.
[edit] root@host# commit
18. When you have finished configuring the router, exit configuration mode.
[edit] root@host# exit root@host>

107
RELATED DOCUMENTATION Prevention of Electrostatic Discharge Damage | 173

4 CHAPTER
Maintaining Components
Maintaining MX204 Components | 109 Maintaining MX204 Cooling System Components | 120 Maintaining MX204 Power System Components | 124

109
Maintaining MX204 Components
IN THIS SECTION Routine Maintenance Procedures for MX204 Routers | 109 Maintaining the MX204 Routing Engine | 109 Replace an SFP, SFP+, or QSFP+ Transceiver | 111 Replace a QSFP28 Transceiver | 115
Routine Maintenance Procedures for MX204 Routers
Purpose For optimum router performance, perform preventive maintenance procedures. Action � Inspect the installation site for moisture, loose wires or cables, and excessive dust. Make sure that airflow
is unobstructed around the router and into the air intake vents. � Check the status-reporting devices on the font panel--system alarms and LEDs.
SEE ALSO Alarm LEDs on the MX204 Front Panel | 25
Maintaining the MX204 Routing Engine
Purpose For optimum router performance, verify the condition of the Routing Engine on a regular basis. Action On a regular basis: � Check the LEDs on the front panel to view information about the status of the Routing Engine. � To check the status of the Routing Engine on the router, issue the show chassis routing-engine command.
The output is similar to the following:

110

user@host> show chassis routing-engine

Routing Engine status: Temperature CPU temperature DRAM Memory utilization 5 sec CPU utilization: User Background Kernel Interrupt Idle 1 min CPU utilization: User Background Kernel Interrupt Idle 5 min CPU utilization: User Background Kernel Interrupt Idle 15 min CPU utilization: User Background Kernel Interrupt Idle Model Start time Uptime Last reboot reason Load averages:

53 degrees C / 127 degrees F 53 degrees C / 127 degrees F 16341 MB (16384 MB installed)
6 percent

0 percent 0 percent 0 percent 0 percent 100 percent

0 percent

100 percent

RE-S-2X00x6

2017-11-29 19:04:56 PST

5 days, 4 hours, 58 minutes, 44 seconds

0x2000:hypervisor reboot

1 minute 5 minute 15 minute

0.10

0.14

0.15

SEE ALSO MX204 Routing Engine Description | 43 MX204 Routing Engine LEDs | 46

111
show chassis routing-engine
Replace an SFP, SFP+, or QSFP+ Transceiver
IN THIS SECTION Remove a Transceiver | 111 Install a Transceiver | 113
The transceivers for Juniper Networks devices are hot-removable and hot-insertable field-replaceable units (FRUs). You can remove and replace them without powering off the device or disrupting the device functions. Remove a Transceiver Before you begin removing a transceiver from a device, ensure that you have taken the necessary precautions for the safe handling of lasers (see "Laser and LED Safety Guidelines and Warnings" on page 158). Ensure that you have the following parts and tools available: � An antistatic bag or an antistatic mat � Rubber safety caps to cover the transceiver and fiber-optic cable connector � A dust cover to cover the port or a replacement transceiver
NOTE: After you remove a transceiver or when you change the media-type configuration, wait for 6 seconds for the interface to display the operational commands.
To remove a transceiver: 1. Place the antistatic bag or antistatic mat on a flat, stable surface. 2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other
end of the strap to an ESD point. 3. Label the cables connected to the transceiver so that you can reconnect them correctly later.

112
4. Remove the cable connected to the transceiver (see Disconnect a Fiber-Optic Cable). Cover the transceiver and the end of each fiber-optic cable connector with a rubber safety cap immediately after disconnecting the fiber-optic cables.
WARNING: Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cables connected to a transceiver emit laser light that can damage your eyes.
WARNING: Do not leave a fiber-optic transceiver uncovered except when inserting or removing a cable. The rubber safety cap keeps the port clean and prevents accidental exposure to laser light.
5. If there is a cable management system, arrange the cable in the cable management system to prevent it from dislodging or developing stress points. Secure the cable so that it does not support its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop in the cable management system. Placing fasteners on the loop helps to maintain its shape.
CAUTION: Do not bend the fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.
6. By using your fingers, pull open the ejector lever on the transceiver to unlock the transceiver.
CAUTION: Ensure that you open the ejector handle completely until you hear it click. Doing this prevents damage to the transceiver.
Figure 45 on page 113 shows how to remove an SFP transceiver. The procedure is the same for SFP+ and QSFP+ transceivers.

g001855

113
Figure 45: Small Form-Factor Pluggable (SFP) Transceiver
Connector
Locking pin
7. Grasp the transceiver ejector handle, and pull the transceiver approximately 0.5 in. (1.3 cm) out of the interface port.
8. Using your fingers, grasp the body of the transceiver, and pull it the rest of the way out of the interface port.
9. Place a rubber safety cap over the transceiver. 10. Place the removed transceiver on an antistatic mat or in an electrostatic bag. 11. Place the dust cover over the empty port or install the replacement transceiver.
CAUTION: After removing a transceiver from the chassis, wait at least 30 seconds before reinserting it or inserting a transceiver into a different slot.
Install a Transceiver Before you begin to install a transceiver in a device, ensure that you have taken the necessary precautions for safe handling of lasers (see "Laser and LED Safety Guidelines and Warnings" on page 158). Ensure that you have a rubber safety cap available to cover the transceiver.
NOTE: After you insert a transceiver or after you change the media-type configuration, wait for 6 seconds for the interface to display operational commands.

114
NOTE: We recommend that you use only optical transceivers and optical connectors purchased from Juniper Networks with your Juniper Networks device.
CAUTION: If you face a problem running a Juniper Networks device that uses a third-party optic or cable, the Juniper Networks Technical Assistance Center (JTAC) can help you diagnose the source of the problem. Your JTAC engineer might recommend that you check the third-party optic or cable and potentially replace it with an equivalent Juniper Networks optic or cable that is qualified for the device.
To install a transceiver: 1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other
end of the strap to an ESD point.
2. Remove the transceiver from its bag.
3. Verify that each transceiver is covered by a rubber safety cap. If it is not, cover the transceiver with a safety cap.
WARNING: Do not leave a fiber-optic transceiver uncovered except when inserting or removing a cable. The rubber safety cap keeps the port clean and prevents accidental exposure to laser light.
4. Using both hands, carefully place the transceiver in the empty port. The connectors must face the chassis.
CAUTION: Before you slide the transceiver into the port, ensure that the transceiver is aligned correctly. Misalignment might cause the pins to bend, making the transceiver unusable.
5. Slide in the transceiver until it is fully seated. If you are unable to fully insert the transceiver, ensure that the connector is facing the right way.

115 Figure 46: Install a Transceiver
1--Ejector lever 6. Close the ejector handle of the transceiver. 7. Remove the rubber safety cap from the transceiver and from the end of the cable. Insert the cable into
the transceiver. WARNING: Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cables connected to a transceiver emit laser light that can damage your eyes.
Replace a QSFP28 Transceiver
IN THIS SECTION Remove a QSFP28 Transceiver | 116 Install a QSFP28 Transceiver | 117
28-Gbps quad small form-factor pluggable (QSFP28) transceivers are hot-insertable and hot-removable. Removing a QSFP28 transceiver does not interrupt router functioning, but the removed QSFP28 transceiver no longer receives or transmits data.

116
Remove a QSFP28 Transceiver
The transceivers for Juniper Networks devices are hot-removable and hot-insertable field-replaceable units (FRUs). You can remove and replace them without powering off the device or disrupting the device functions.
NOTE: After you insert a transceiver or after you change the media-type configuration, wait for 6 seconds for the interface to display operational commands.
NOTE: We recommend that you use only optical transceivers and optical connectors purchased from Juniper Networks with your Juniper Networks device.
Before you begin to remove a transceiver from a device, ensure that you have taken the necessary precautions for safe handling of lasers (see "Laser and LED Safety Guidelines and Warnings" on page 158). Ensure that you have the following parts and tools available: � An antistatic bag or an antistatic mat � Rubber safety caps to cover the transceiver and fiber-optic cable connector � A dust cover to cover the port or a replacement transceiver To remove a QSFP28 transceiver (see Figure 47 on page 117): 1. Place an electrostatic bag or antistatic mat on a flat, stable surface to receive the QSFP28 transceiver.
Have ready a rubber safety cap for the QSFP28 transceiver and the cable.
2. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other end of the strap to an ESD point.
3. Label the cable connected to the QSFP28 transceiver so that you can later reconnect the cable to the correct QSFP28 transceiver.
4. Disconnect the cable from the transceiver. Immediately cover the transceiver and the end of the cable with a rubber safety cap.
WARNING: Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.

117
CAUTION: Do not leave a fiber-optic transceiver uncovered except when inserting or removing a cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.
5. If there is a cable management system, arrange the cable in the cable management system to prevent it from dislodging or developing stress points. Secure the cable so that it does not support its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop in the cable management system. Placing fasteners on the loop helps to maintain its shape. CAUTION: Avoid bending the fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.
6. Pull the transceiver's rubber handle straight back. The locking pins on the transceiver automatically releases the transceiver.
Figure 47: 28-Gbps Quad Small Form-Factor Pluggable (QSFP28) Transceiver
7. Place the transceiver on the antistatic mat or in the electrostatic bag. 8. Place the dust cover over the empty port or install the replacement transceiver. Install a QSFP28 Transceiver The transceivers for Juniper Networks devices are hot-removable and hot-insertable field-replaceable units (FRUs): You can remove and replace them without powering off the device or disrupting the device functions.

118
NOTE: After you insert a transceiver or after you change the media-type configuration, wait for 6 seconds for the interface to display operational commands.
NOTE: We recommend that you use only optical transceivers and optical connectors purchased from Juniper Networks with your Juniper Networks device.
CAUTION: If you face a problem running a Juniper Networks device that uses a third-party optic or cable, the Juniper Networks Technical Assistance Center (JTAC) can help you diagnose the source of the problem. Your JTAC engineer might recommend that you check the third-party optic or cable and potentially replace it with an equivalent Juniper Networks optic or cable that is qualified for the device.
Before you begin to install a transceiver in a device, ensure that you have taken the necessary precautions for safe handling of lasers (see "Laser and LED Safety Guidelines and Warnings" on page 158). Ensure that you have a rubber safety cap available to cover the transceiver. To install a replacement QSFP28 transceiver (see Figure 48 on page 118): 1. Wrap and fasten one end of the ESD grounding strap around your bare wrist, and connect the other
end of the strap to an ESD point. 2. Verify that a rubber safety cap covers the QSFP28 transceiver. If it is not, cover the transceiver with
a safety cap. 3. Orient the transceiver in front of the port so that the QSFP28 connector faces the appropriate direction.
Figure 48: Install a QSFP28 Transceiver

g100161

Ejector tab

Locking pin

119
4. Slide the transceiver into the slot until the locking pins lock in place. If there is resistance, remove the transceiver and flip it so that the connector faces the other direction.
5. Remove the rubber safety cap from the transceiver and from the end of the cable, and insert the cable into the transceiver.
WARNING: Do not look directly into a fiber-optic transceiver or into the ends of fiber-optic cables. Fiber-optic transceivers and fiber-optic cable connected to a transceiver emit laser light that can damage your eyes.
CAUTION: Do not leave a fiber-optic transceiver uncovered except when inserting or removing a cable. The safety cap keeps the port clean and prevents accidental exposure to laser light.
6. If there is a cable management system, arrange the cable in the cable management system to prevent the cable from dislodging or developing stress points. Secure the cable so that it does not support its own weight as it hangs to the floor. Place excess cable out of the way in a neatly coiled loop in the cable management system. Placing fasteners on the loop helps to maintain its shape.
CAUTION: Do not let the fiber-optic cable hang free from the connector. Do not allow fastened loops of the cable to dangle, which stresses the cable at the fastening point.
CAUTION: Avoid bending the fiber-optic cable beyond its minimum bend radius. An arc smaller than a few inches in diameter can damage the cable and cause problems that are difficult to diagnose.
7. Verify that the status LEDs on the router indicate that the QSFP28 transceiver is functioning correctly. You can also verify that the interface port is functioning by running the show chassis fpc pic-status command.

120
Maintaining MX204 Cooling System Components
IN THIS SECTION Maintaining the MX204 Fan Module | 120 Replacing an MX204 Fan Module | 121

Maintaining the MX204 Fan Module

Purpose For optimum cooling, verify the condition of the fans.
Action � Monitor the status of the fans. A fan module contains multiple fans that work in unison to cool the router
components. If one fan fails, the router adjusts the speed of the remaining fans to maintain proper cooling. A red alarm is triggered when a fan fails, and when a fan module is removed.
� To display the status of the cooling system, issue the show chassis environment command. The output is similar to the following:

user@host> show chassis environment

Class Item Temp CB 0 Top Right Inlet Sensor
CB 0 Top Left Inlet Sensor CB 0 Top Right Exhaust Sensor CB 0 Top Left Exhaust Sensor CB 0 CPU Core-0 Temp CB 0 CPU Core-1 Temp CB 0 CPU Core-2 Temp CB 0 CPU Core-3 Temp CB 0 CPU Core-4 Temp CB 0 CPU Core-5 Temp CB 0 CPU Core-6 Temp CB 0 CPU Core-7 Temp FPC 0 EA0_HMC0 Logic die FPC 0 EA0_HMC0 DRAM botm FPC 0 EA0_HMC1 Logic die FPC 0 EA0_HMC1 DRAM botm

Status OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK

Measurement 35 degrees C / 95 degrees F 38 degrees C / 100 degrees F 45 degrees C / 113 degrees F 64 degrees C / 147 degrees F 49 degrees C / 120 degrees F 49 degrees C / 120 degrees F 48 degrees C / 118 degrees F 49 degrees C / 120 degrees F 49 degrees C / 120 degrees F 48 degrees C / 118 degrees F 48 degrees C / 118 degrees F 48 degrees C / 118 degrees F 81 degrees C / 177 degrees F 78 degrees C / 172 degrees F 85 degrees C / 185 degrees F 82 degrees C / 179 degrees F

FPC 0 EA0 Chip FPC 0 EA0-XR0 Chip FPC 0 EA0-XR1 Chip Power PEM 0 PEM 1 Fans Fan Tray 0 Fan 0 Fan Tray 0 Fan 1 Fan Tray 1 Fan 0 Fan Tray 1 Fan 1 Fan Tray 2 Fan 0 Fan Tray 2 Fan 1

121

93 degrees C / 199 degrees F

69 degrees C / 156 degrees F

73 degrees C / 163 degrees F

49 degrees C / 120 degrees F

Spinning at normal speed

SEE ALSO MX204 Cooling System Description | 26 show chassis environment
Replacing an MX204 Fan Module
IN THIS SECTION Removing an MX204 Fan Module | 122 Installing an MX204 Fan Module | 123

122
Removing an MX204 Fan Module
NOTE: To prevent overheating, install the replacement fan module immediately after removing the existing fan module.
To remove the fan module (see Figure 49 on page 122): 1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on
the chassis. 2. Loosen the captive screw on the fan module faceplate (use a number-2 Phillips screwdriver). 3. Hold and press the latch located on the inside of the fan module to release it from the chassis.
WARNING: To avoid injury, keep tools and your fingers away from the fans as you slide the fan module out of the chassis. The fans might still be spinning.
4. Place one hand under the fan module to support it, and pull the fan module completely out of the chassis.
Figure 49: Removing the Fan Module

g009879

123 Installing an MX204 Fan Module To install the fan module (see Figure 50 on page 123): 1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on
the chassis. 2. Grasp the fan module by the handle, and place one hand under the fan module for support. 3. Place the fan module on the respective slot, and carefully push the fan module into the chassis until
the socket lock snaps into place and holds it. 4. Using a number-2 Phillips screwdriver, turn the locking screw on the fan module faceplate until it is
tight and secured. Figure 50: Installing the Fan Module
SEE ALSO MX204 Cooling System Description | 26 Prevention of Electrostatic Discharge Damage | 173

g009878

124
Maintaining MX204 Power System Components
IN THIS SECTION Maintaining the MX204 Power Supplies | 124 Replacing an MX204 AC Power Supply | 126 Replacing an MX204 DC Power Supply | 128

Maintaining the MX204 Power Supplies

Purpose For optimum router performance, verify the condition of the power supply modules.
Action On a regular basis, check the power supply status:
� To check the power supply status, issue the show chassis environment CLI command. The output is similar to the following:

user@host> show chassis environment

Status OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK

Measurement 26 degrees C / 78 degrees F 22 degrees C / 71 degrees F 31 degrees C / 87 degrees F 44 degrees C / 111 degrees F 35 degrees C / 95 degrees F 34 degrees C / 93 degrees F 34 degrees C / 93 degrees F 34 degrees C / 93 degrees F 33 degrees C / 91 degrees F 33 degrees C / 91 degrees F 33 degrees C / 91 degrees F 33 degrees C / 91 degrees F 55 degrees C / 131 degrees F 52 degrees C / 125 degrees F 55 degrees C / 131 degrees F 52 degrees C / 125 degrees F

125

FPC 0 EA0 Chip FPC 0 EA0-XR0 Chip FPC 0 EA0-XR1 Chip Power PEM 0 PEM 1 Fans Fan Tray 0 Fan 0 Fan Tray 0 Fan 1 Fan Tray 1 Fan 0 Fan Tray 1 Fan 1 Fan Tray 2 Fan 0 Fan Tray 2 Fan 1

64 degrees C / 147 degrees F

56 degrees C / 132 degrees F

57 degrees C / 134 degrees F

Spinning at normal speed

� Make sure that the power and grounding cables are arranged so that they do not obstruct access to other router components.
� Routinely check the status LEDs on the power supply faceplates and the craft interface to determine if the power supplies are functioning normally.
� Check the red and yellow alarm LEDs on the craft interface. Power supply failure or removal triggers an alarm that causes one or both of the LEDs to light. You can display the associated error messages by issuing the following command:
user@host> show chassis alarms
� Periodically inspect the site to ensure that the grounding and power cables connected to the router are securely in place and that there is no moisture accumulating near the router.
CAUTION: Do not mix AC and DC power supplies in the same chassis.

SEE ALSO
MX204 Power System Description | 30 MX204 Power Supply Module LEDs | 32

126
Replacing an MX204 AC Power Supply
IN THIS SECTION Removing an MX204 AC Power Supply | 126 Installing an MX204 AC Power Supply | 127
Removing an MX204 AC Power Supply Before you remove a power supply, be aware of the following:
NOTE: The minimum required number of power supply modules must be present in the router at all times.
CAUTION: To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a blank panel shortly after the removal.
NOTE: After powering off a power supply, wait at least 60 seconds before turning it back on.
CAUTION: Do not mix AC and DC power supply modules in the same chassis.
To remove an AC power supply (see Figure 51 on page 127): 1. Switch off the dedicated customer-site circuit breaker for the power supply, and remove the power
cord from the AC power source. Follow the instructions for your site. 2. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on
the chassis.

g009869

127
3. Remove the power cord from the power supply. 4. Press the release latch on the side of the AC power supply to disconnect the power supply from the
chassis (see Figure 51 on page 127). 5. Pull the power supply straight out of the chassis.
Figure 51: Removing an AC Power Supply
Installing an MX204 AC Power Supply To install an AC power supply (see Figure 52 on page 128): 1. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on
the chassis. 2. Using both hands, hold and slide the AC power supply straight into the chassis until the power supply
is fully seated in the chassis slot. The power supply faceplate must alligned with any adjacent power supply faceplate or blank installed in the power supply slot. 3. Press the latch located on the side of the power supply to slide it into the chassis. 4. Attach the power cord to the power supply. 5. Attach the power cord to the AC power source, and switch on the dedicated customer-site circuit breaker. Follow the instructions for your site. 6. Observe the status LED on the power supply faceplate. If the power supply is correctly installed and functioning normally, the status LED lights green steadily.

g009868

128 Figure 52: Installing an AC Power Supply
SEE ALSO MX204 Power System Description | 30 MX204 Router AC Power Specifications | 35 AC Power Circuit Breaker Requirements for the MX204 Router | 36 Prevention of Electrostatic Discharge Damage | 173
Replacing an MX204 DC Power Supply
IN THIS SECTION Removing an MX204 DC Power Supply | 128 Installing an MX204 DC Power Supply | 130
Removing an MX204 DC Power Supply Before you remove a power supply, be aware of the following:
NOTE: The minimum required number of power supply modules must be present in the router at all times.

129
WARNING: Before performing DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.
CAUTION: To maintain proper cooling and prevent thermal shutdown of the operating power supply unit, each power supply slot must contain either a power supply or a blank panel. If you remove a power supply, you must install a replacement power supply or a blank panel shortly after the removal.
NOTE: After powering off a power supply, wait at least 60 seconds before turning it back on.
CAUTION: Do not mix AC and DC power supply modules in the same chassis.
To remove a DC power supply: 1. Switch off the dedicated customer-site circuit breaker for the power supply being removed. Follow
your site's procedures for ESD. 2. Make sure that the voltage across the DC power source cable leads is 0 V and that there is no chance
that the cables might become active during the removal process. 3. Verify that the status LED on the power supply is not lit. 4. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on
the chassis. 5. Remove the clear plastic cover protecting the terminal studs on the faceplate. 6. Using a socket screw driver, remove the screw from each of the DC power terminals (see
Figure 53 on page 130). 7. Remove the cable lugs from the terminals.

g009875

130 8. Carefully move the power cables out of the way. 9. Press the latch located on the DC power supply, to release it from the chassis. 10. Pull the power supply straight out of the chassis (see Figure 54 on page 130). Figure 53: Disconnecting the DC Power Cables
Figure 54: Removing a DC Power Supply
Installing an MX204 DC Power Supply WARNING: Before performing DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the off position, and tape the switch handle of the circuit breaker in the off position.
To install a DC power supply (see Figure 55 on page 132): 1. Ensure that the voltage across the DC power source cable leads is 0 V and that there is no chance that
the cable leads might become active during installation. 2. Attach an ESD grounding strap to your bare wrist and connect the strap to one of the ESD points on
the chassis.

g009874

131
3. Using both hands, slide the DC power supply straight into the chassis until the power supply is fully seated in the chassis slot. The power supply faceplate must alligned with any adjacent power supply faceplate or blank installed in the power supply slot.
4. Remove the clear plastic cover protecting the terminal on the faceplate.
5. Remove the screws from the terminals.
6. Secure each power cable lug to the terminal with the screw (see Figure 56 on page 132). Apply between 5 lb-in. (0.6 Nm) and 6 lb-in. (0.7 Nm) of torque to the screw. Do not overtighten the screw (use a socket nut driver). a. Secure the positive (+) DC source power cable lug to the RTN (return) terminal. b. Secure the negative (�) DC source power cable lug to the �48V (input) terminal.
CAUTION: Ensure that each power cable lug seats flush against the surface of the terminal block as you are tightening the screws. Ensure that each screw is properly threaded into the terminal. Applying installation torque to the screw when improperly threaded can result in damage to the terminal.
CAUTION: You must ensure that power connections maintain the proper polarity. The power source cables might be labeled (+) and (�) to indicate their polarity. There is no standard color coding for DC power cables. The color coding used by the external DC power source at your site determines the color coding for the leads on the power cables that attach to the terminal studs on each power supply.
7. Replace the clear plastic cover over the terminals on the faceplate.
8. Verify that the power cabling is correct, that the cables do not touch or block access to router components, and that they do not drape where people could trip on them.
9. Attach the power cable to the DC power source, and switch on the dedicated customer-site circuit breaker. Follow the instructions for your site.

g009873

132 NOTE: If more than one power supply is being installed, turn on all power supply modules at the same time. 10. Observe the status LED on the power supply faceplate. If the power supply is correctly installed and functioning normally, the status LED lights green steadily. Figure 55: Installing a DC Power Supply
Figure 56: Connecting the DC Power Cables
SEE ALSO MX204 Power System Description | 30 MX204 Router DC Power Specifications | 39 DC Power Circuit Breaker Requirements for the MX204 Router | 40 DC Power Source Cabling for MX204 Router | 41 DC Power Cable Specifications for MX204 Router | 42 Prevention of Electrostatic Discharge Damage | 173

g009875

5 CHAPTER
Contacting Customer Support and Returning the Chassis or Components
Contacting Customer Support and Returning the Chassis or Components | 134

134
Contacting Customer Support and Returning the Chassis or Components
IN THIS SECTION Contacting Customer Support | 134 Contact Customer Support to Obtain Return Material Authorization | 135 Locating the Serial Number on an MX204 Router or Component | 136 Guidelines for Packing Hardware Components for Shipment | 139
Contacting Customer Support
You can contact Juniper Networks Technical Assistance Center (JTAC) 24 hours a day, 7 days a week in one of the following ways: � On the Web, using the Service Request Manager link at:
https://support.juniper.net/support/ � By telephone:
� From the US and Canada: 1-888-314-JTAC � From all other locations: 1-408-745-9500
NOTE: If contacting JTAC by telephone, enter your 12-digit service request number followed by the pound (#) key if this is an existing case, or press the star (*) key to be routed to the next available support engineer.
When requesting support from JTAC by telephone, be prepared to provide the following information: � Your existing service request number, if you have one � Details of the failure or problem � Type of activity being performed on the device when the problem occurred

135
� Configuration data displayed by one or more show commands � Your name, organization name, telephone number, fax number, and shipping address The support representative validates your request and issues an RMA number for return of the component.
Contact Customer Support to Obtain Return Material Authorization
If you are returning a device or hardware component to Juniper Networks for repair or replacement, obtain a Return Material Authorization (RMA) number from Juniper Networks Technical Assistance Center (JTAC). After locating the serial number of the device or hardware component you want to return, open a service request with Juniper Networks Technical Assistance Center (JTAC) on the Web or by telephone. Before you request an RMA number from JTAC, be prepared to provide the following information: � Your existing service request number, if you have one � Serial number of the component � Your name, organization name, telephone number, fax number, and shipping address � Details of the failure or problem � Type of activity being performed on the device when the problem occurred � Configuration data displayed by one or more show commands You can contact JTAC 24 hours a day, seven days a week on the Web or by telephone: � Service Request Manager: https://support.juniper.net/support � Telephone: +1-888-314-JTAC (+1-888-314-5822), toll free in U.S., Canada, and Mexico
NOTE: For international or direct-dial options in countries without toll free numbers, see https://support.juniper.net/support
If you are contacting JTAC by telephone, enter your 12-digit service request number followed by the pound (#) key for an existing case, or press the star (*) key to be routed to the next available support engineer. The support representative validates your request and issues an RMA number for return of the component.

136
Locating the Serial Number on an MX204 Router or Component
IN THIS SECTION Listing the Chassis and Component Details Using the CLI | 136 Locating the Chassis Serial Number ID Label on an MX204 | 137 Locating the Serial Number ID Labels on MX204 Power Supplies | 137 Locating the Serial Number ID Label on an MX204 Fan Module | 138

If you are returning a router or component to Juniper Networks for repair or replacement, you must locate the serial number of the router or component. You must provide the serial number to the Juniper Networks Technical Assistance Center (JTAC) when you contact them to obtain a Return Materials Authorization (RMA). See "Contact Customer Support to Obtain Return Material Authorization" on page 135.
If the router is operational and you can access the command-line interface (CLI), you can list serial numbers for the router and for some components with a CLI command. If you do not have access to the CLI or if the serial number for the component does not appear in the command output, you can locate the serial number ID label on the router or component.
NOTE: If you want to find the serial number ID label on a component, you need to remove the component from the router chassis, for which you must have the required parts and tools available.

Listing the Chassis and Component Details Using the CLI
To list the MX204 chassis and the components and their serial numbers, use the show chassis hardware CLI operational mode command. user@device> show chassis hardware

Hardware inventory:

Item

Version

Chassis

Routing Engine 0

CB 0

REV 11

FPC 0

PIC 0

Part number
BUILTIN 750-069579 BUILTIN BUILTIN

Serial number BB768 BUILTIN CAJD3113 BUILTIN BUILTIN

Description JNP204 [MX204] RE-S-2X00x6 JNP204 [MX204] MPC 4XQSFP28 PIC

137

Xcvr 0 Xcvr 1 Xcvr 2 Xcvr 3 PIC 1 PEM 0 PEM 1 Fan Tray 0 Airflow - AFO Fan Tray 1 Airflow - AFO Fan Tray 2 Airflow - AFO

REV 01 REV 01 REV 01 REV 01
REV 02 REV 04

740-058732 740-054053 740-058732 740-058732 BUILTIN 740-070749 740-043886

F5I2018309 QF027546 1AMQA14203X 1GCQA0370CK BUILTIN 1F186390026 1GA46361256

QSFP-100GBASE-LR4 QSFP+-4X10G-SR QSFP-100GBASE-LR4 QSFP-100GBASE-LR4 8XSFPP PIC AC AFO 650W PSU JPSU-650W-DC-AFO Fan Tray, Front to Back
Fan Tray, Front to Back
Fan Tray, Front to Back

Locating the Chassis Serial Number ID Label on an MX204 The serial number ID label is located on a label on the top of the chassis. See Figure 57 on page 137 for the location on an MX204.
Figure 57: MX204 Chassis Serial Number Label
Serial number ID label

g0 0 9893

Locating the Serial Number ID Labels on MX204 Power Supplies
The power supplies installed in an MX204 are field-replaceable units (FRUs). For each FRU, you must remove the FRU from the router chassis to see the FRU serial number ID label.
� AC power supply--The serial number ID label is on the top of the AC power supply. See Figure 58 on page 138.

g009895

138 Figure 58: MX204 AC Power Supply Serial Number Location
Serial number ID label
� DC power supply--The serial number ID label is on the top of the DC power supply. See Figure 59 on page 138.
Figure 59: MX204 DC Power Supply Serial Number Location
Serial number ID label
Locating the Serial Number ID Label on an MX204 Fan Module The fan modules installed in an MX204 are field-replaceable units (FRUs). For each FRU, you must remove the FRU from the router chassis to see the FRU serial number ID label. Fan module�The serial number ID label is located at the base of the fan module. See Figure 60 on page 139.

g009896

g009894

139 Figure 60: MX204 Fan Module Serial Number Location
Serial number ID label
SEE ALSO MX204 Hardware Components and CLI Terminology | 23
Guidelines for Packing Hardware Components for Shipment
To pack and ship individual components: � When you return components, make sure that they are adequately protected with packing materials
and packed so that the pieces are prevented from moving around inside the carton. � Use the original shipping materials if they are available. � Place individual components in antistatic bags. � Write the RMA number on the exterior of the box to ensure proper tracking.
CAUTION: Do not stack any of the hardware components.

6 CHAPTER
Safety and Compliance Information
Definitions of Safety Warning Levels | 142 General Safety Guidelines and Warnings | 145 General Safety Warnings for Juniper Networks Devices | 146 Fire Safety Requirements | 150 Installation Instructions Warning | 152 Chassis and Component Lifting Guidelines | 152 Ramp Warning | 153 Rack-Mounting and Cabinet-Mounting Warnings | 153 Laser and LED Safety Guidelines and Warnings | 158 Radiation from Open Port Apertures Warning | 163 Maintenance and Operational Safety Guidelines and Warnings | 164 General Electrical Safety Guidelines and Warnings | 172 Prevention of Electrostatic Discharge Damage | 173 Site Electrical Wiring Guidelines | 174 AC Power Electrical Safety Guidelines | 175

142
Definitions of Safety Warning Levels
The documentation uses the following levels of safety warnings (there are two Warning formats): NOTE: You might find this information helpful in a particular situation, or you might overlook this important information if it was not highlighted in a Note.
CAUTION: You need to observe the specified guidelines to prevent minor injury or discomfort to you or severe damage to the device.
WARNING: This symbol alerts you to the risk of personal injury from a laser.

143

144
WARNING: This symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents.
Waarschuwing Dit waarschuwingssymbool betekent gevaar. U verkeert in een situatie die lichamelijk letsel kan veroorzaken. Voordat u aan enige apparatuur gaat werken, dient u zich bewust te zijn van de bij elektrische schakelingen betrokken risico's en dient u op de hoogte te zijn van standaard maatregelen om ongelukken te voorkomen.
Varoitus T�m� varoitusmerkki merkitsee vaaraa. Olet tilanteessa, joka voi johtaa ruumiinvammaan. Ennen kuin ty�skentelet mink��n laitteiston parissa, ota selv�� s�hk�kytkent�ihin liittyvist� vaaroista ja tavanomaisista onnettomuuksien ehk�isykeinoista.
Attention Ce symbole d'avertissement indique un danger. Vous vous trouvez dans une situation pouvant causer des blessures ou des dommages corporels. Avant de travailler sur un �quipement, soyez conscient des dangers pos�s par les circuits �lectriques et familiarisez-vous avec les proc�dures couramment utilis�es pour �viter les accidents.
Warnung Dieses Warnsymbol bedeutet Gefahr. Sie befinden sich in einer Situation, die zu einer K�rperverletzung f�hren k�nnte. Bevor Sie mit der Arbeit an irgendeinem Ger�t beginnen, seien Sie sich der mit elektrischen Stromkreisen verbundenen Gefahren und der Standardpraktiken zur Vermeidung von Unf�llen bewu�t.
Avvertenza Questo simbolo di avvertenza indica un pericolo. La situazione potrebbe causare infortuni alle persone. Prima di lavorare su qualsiasi apparecchiatura, occorre conoscere i pericoli relativi ai circuiti elettrici ed essere al corrente delle pratiche standard per la prevenzione di incidenti.
Advarsel Dette varselsymbolet betyr fare. Du befinner deg i en situasjon som kan f�re til personskade. F�r du utf�rer arbeid p� utstyr, m� du vare oppmerksom p� de faremomentene som elektriske kretser inneb�rer, samt gj�re deg kjent med vanlig praksis n�r det gjelder � unng� ulykker.
Aviso Este s�mbolo de aviso indica perigo. Encontra-se numa situa��o que lhe poder� causar danos f�sicos. Antes de come�ar a trabalhar com qualquer equipamento, familiarize-se com os perigos relacionados com circuitos el�ctricos, e com quaisquer pr�ticas comuns que possam prevenir poss�veis acidentes.
�Atenci�n! Este s�mbolo de aviso significa peligro. Existe riesgo para su integridad f�sica. Antes de manipular cualquier equipo, considerar los riesgos que entra�a la corriente el�ctrica y familiarizarse con los procedimientos est�ndar de prevenci�n de accidentes.

145
Varning! Denna varningssymbol signalerar fara. Du befinner dig i en situation som kan leda till personskada. Innan du utf�r arbete p� n�gon utrustning m�ste du vara medveten om farorna med elkretsar och k�nna till vanligt f�rfarande f�r att f�rebygga skador.
General Safety Guidelines and Warnings
The following guidelines help ensure your safety and protect the device from damage. The list of guidelines might not address all potentially hazardous situations in your working environment, so be alert and exercise good judgment at all times. � Perform only the procedures explicitly described in the hardware documentation for this device. Make
sure that only authorized service personnel perform other system services. � Keep the area around the device clear and free from dust before, during, and after installation. � Keep tools away from areas where people could trip over them while walking. � Do not wear loose clothing or jewelry, such as rings, bracelets, or chains, which could become caught
in the device. � Wear safety glasses if you are working under any conditions that could be hazardous to your eyes. � Do not perform any actions that create a potential hazard to people or make the equipment unsafe. � Never attempt to lift an object that is too heavy for one person to handle. � Never install or manipulate wiring during electrical storms. � Never install electrical jacks in wet locations unless the jacks are specifically designed for wet
environments. � Operate the device only when it is properly grounded. � Follow the instructions in this guide to properly ground the device to earth. � Replace fuses only with fuses of the same type and rating. � Do not open or remove chassis covers or sheet-metal parts unless instructions are provided in the
hardware documentation for this device. Such an action could cause severe electrical shock. � Do not push or force any objects through any opening in the chassis frame. Such an action could result
in electrical shock or fire. � Avoid spilling liquid onto the chassis or onto any device component. Such an action could cause electrical
shock or damage the device. � Avoid touching uninsulated electrical wires or terminals that have not been disconnected from their
power source. Such an action could cause electrical shock.

146 � Some parts of the chassis, including AC and DC power supply surfaces, power supply unit handles, SFB
card handles, and fan tray handles might become hot. The following label provides the warning of the hot surfaces on the chassis:
� Always ensure that all modules, power supplies, and cover panels are fully inserted and that the installation screws are fully tightened.
General Safety Warnings for Juniper Networks Devices
IN THIS SECTION Qualified Personnel Warning | 147 Restricted-Access Area Warning | 148

147
Qualified Personnel Warning
WARNING: Only trained and qualified personnel should install or replace the hardware equipment. Waarschuwing Installatie en reparaties mogen uitsluitend door getraind en bevoegd personeel uitgevoerd worden. Varoitus Ainoastaan koulutettu ja p�tev� henkil�kunta saa asentaa tai vaihtaa t�m�n laitteen. Attention Tout installation ou remplacement de l'appareil doit �tre r�alis� par du personnel qualifi� et comp�tent. Warnung Ger�t nur von geschultem, qualifiziertem Personal installieren oder auswechseln lassen. Avvertenza Solo personale addestrato e qualificato deve essere autorizzato ad installare o sostituire questo apparecchio. Advarsel Kun kvalifisert personell med riktig oppl�ring b�r montere eller bytte ut dette utstyret. Aviso Este equipamento dever� ser instalado ou substitu�do apenas por pessoal devidamente treinado e qualificado. �Atenci�n! Estos equipos deben ser instalados y reemplazados exclusivamente por personal t�cnico adecuadamente preparado y capacitado. Varning! Denna utrustning ska endast installeras och bytas ut av utbildad och kvalificerad personal.

148
Restricted-Access Area Warning

149
WARNING: The hardware equipment is intended for installation in restricted-access areas. A restricted-access area is an area to which access can be gained only by service personnel through the use of a special tool, lock and key, or other means of security, and which is controlled by the authority responsible for the location.
Waarschuwing Dit toestel is bedoeld voor installatie op plaatsen met beperkte toegang. Een plaats met beperkte toegang is een plaats waar toegang slechts door servicepersoneel verkregen kan worden door middel van een speciaal instrument, een slot en sleutel, of een ander veiligheidsmiddel, en welke beheerd wordt door de overheidsinstantie die verantwoordelijk is voor de locatie.
Varoitus T�m� laite on tarkoitettu asennettavaksi paikkaan, johon p��sy on rajoitettua. Paikka, johon p��sy on rajoitettua, tarkoittaa paikkaa, johon vain huoltohenkil�st� p��see jonkin erikoisty�kalun, lukkoon sopivan avaimen tai jonkin muun turvalaitteen avulla ja joka on paikasta vastuussa olevien toimivaltaisten henkil�iden valvoma.
Attention Cet appareil est � installer dans des zones d'acc�s r�serv�. Ces derni�res sont des zones auxquelles seul le personnel de service peut acc�der en utilisant un outil sp�cial, un m�canisme de verrouillage et une cl�, ou tout autre moyen de s�curit�. L'acc�s aux zones de s�curit� est sous le contr�le de l'autorit� responsable de l'emplacement.
Warnung Diese Einheit ist zur Installation in Bereichen mit beschr�nktem Zutritt vorgesehen. Ein Bereich mit beschr�nktem Zutritt ist ein Bereich, zu dem nur Wartungspersonal mit einem Spezialwerkzeugs, Schlo� und Schl�ssel oder anderer Sicherheitsvorkehrungen Zugang hat, und der von dem f�r die Anlage zust�ndigen Gremium kontrolliert wird.
Avvertenza Questa unit� deve essere installata in un'area ad accesso limitato. Un'area ad accesso limitato � un'area accessibile solo a personale di assistenza tramite un'attrezzo speciale, lucchetto, o altri dispositivi di sicurezza, ed � controllata dall'autorit� responsabile della zona.
Advarsel Denne enheten er laget for installasjon i omr�der med begrenset adgang. Et omr�de med begrenset adgang gir kun adgang til servicepersonale som bruker et spesielt verkt�y, l�s og n�kkel, eller en annen sikkerhetsanordning, og det kontrolleres av den autoriteten som er ansvarlig for omr�det.
Aviso Esta unidade foi concebida para instala��o em �reas de acesso restrito. Uma �rea de acesso restrito � uma �rea � qual apenas tem acesso o pessoal de servi�o autorizado, que possua uma ferramenta, chave e fechadura especial, ou qualquer outra forma de seguran�a. Esta �rea � controlada pela autoridade respons�vel pelo local.

150
�Atenci�n! Esta unidad ha sido dise�ada para instalarse en �reas de acceso restringido. �rea de acceso restringido significa un �rea a la que solamente tiene acceso el personal de servicio mediante la utilizaci�n de una herramienta especial, cerradura con llave, o alg�n otro medio de seguridad, y que est� bajo el control de la autoridad responsable del local. Varning! Denna enhet �r avsedd f�r installation i omr�den med begr�nsat tilltr�de. Ett omr�de med begr�nsat tilltr�de f�r endast tilltr�das av servicepersonal med ett speciellt verktyg, l�s och nyckel, eller annan s�kerhetsanordning, och kontrolleras av den auktoritet som ansvarar f�r omr�det.
RELATED DOCUMENTATION Installation Safety Warnings for Juniper Networks Devices Maintenance and Operational Safety Warnings for Juniper Networks Devices General Electrical Safety Warnings for Juniper Networks Devices DC Power Electrical Safety Warnings for Juniper Networks Devices
Fire Safety Requirements
In the event of a fire emergency, the safety of people is the primary concern. You should establish procedures for protecting people in the event of a fire emergency, provide safety training, and properly provision fire-control equipment and fire extinguishers. In addition, you should establish procedures to protect your equipment in the event of a fire emergency. Juniper Networks products should be installed in an environment suitable for electronic equipment. We recommend that fire suppression equipment be available in the event of a fire in the vicinity of the equipment and that all local fire, safety, and electrical codes and ordinances be observed when you install and operate your equipment.
Fire Suppression
In the event of an electrical hazard or an electrical fire, you should first turn power off to the equipment at the source. Then use a Type C fire extinguisher, which uses noncorrosive fire retardants, to extinguish the fire.

151
Fire Suppression Equipment
Type C fire extinguishers, which use noncorrosive fire retardants such as carbon dioxide and HalotronTM, are most effective for suppressing electrical fires. Type C fire extinguishers displace oxygen from the point of combustion to eliminate the fire. For extinguishing fire on or around equipment that draws air from the environment for cooling, you should use this type of inert oxygen displacement extinguisher instead of an extinguisher that leaves residues on equipment. Do not use multipurpose Type ABC chemical fire extinguishers (dry chemical fire extinguishers). The primary ingredient in these fire extinguishers is monoammonium phosphate, which is very sticky and difficult to clean. In addition, in the presence of minute amounts of moisture, monoammonium phosphate can become highly corrosive and corrodes most metals. Any equipment in a room in which a chemical fire extinguisher has been discharged is subject to premature failure and unreliable operation. The equipment is considered to be irreparably damaged.
NOTE: To keep warranties effective, do not use a dry chemical fire extinguisher to control a fire at or near a Juniper Networks device. If a dry chemical fire extinguisher is used, the unit is no longer eligible for coverage under a service agreement.
We recommend that you dispose of any irreparably damaged equipment in an environmentally responsible manner.

152
Installation Instructions Warning
WARNING: Read the installation instructions before you connect the device to a power source. Waarschuwing Raadpleeg de installatie-aanwijzingen voordat u het systeem met de voeding verbindt. Varoitus Lue asennusohjeet ennen j�rjestelm�n yhdist�mist� virtal�hteeseen. Attention Avant de brancher le syst�me sur la source d'alimentation, consulter les directives d'installation. Warnung Lesen Sie die Installationsanweisungen, bevor Sie das System an die Stromquelle anschlie�en. Avvertenza Consultare le istruzioni di installazione prima di collegare il sistema all'alimentatore. Advarsel Les installasjonsinstruksjonene f�r systemet kobles til str�mkilden. Aviso Leia as instru�es de instala��o antes de ligar o sistema � sua fonte de energia. �Atenci�n! Ver las instrucciones de instalaci�n antes de conectar el sistema a la red de alimentaci�n. Varning! L�s installationsanvisningarna innan du kopplar systemet till dess str�mf�rs�rjningsenhet.
Chassis and Component Lifting Guidelines
� Before moving the device to a site, ensure that the site meets the power, environmental, and clearance requirements.
� Before lifting or moving the device, disconnect all external cables and wires. � As when lifting any heavy object, ensure that most of the weight is borne by your legs rather than your
back. Keep your knees bent and your back relatively straight. Do not twist your body as you lift. Balance the load evenly and be sure that your footing is firm. � Use the following lifting guidelines to lift devices and components:

153
� Up to 39.7 lbs (18 kg): One person. � 39.7 lbs (18 kg) to 70.5 lbs (32 kg): Two or more people. � 70.5 lbs (32 kg) to 121.2 lbs (55 kg): Three or more people. � Above 121.2 lbs (55 kg): Material handling systems (such as levers, slings, lifts and so on) must be used.
When this is not practical, specially trained persons or systems must be used (riggers or movers).
Ramp Warning
WARNING: When installing the device, do not use a ramp inclined at more than 10 degrees. Waarschuwing Gebruik een oprijplaat niet onder een hoek van meer dan 10 graden. Varoitus �l� k�yt� sellaista kaltevaa pintaa, jonka kaltevuus ylitt�� 10 astetta. Attention Ne pas utiliser une rampe dont l'inclinaison est sup�rieure � 10 degr�s. Warnung Keine Rampen mit einer Neigung von mehr als 10 Grad verwenden. Avvertenza Non usare una rampa con pendenza superiore a 10 gradi. Advarsel Bruk aldri en rampe som heller mer enn 10 grader. Aviso N�o utilize uma rampa com uma inclina��o superior a 10 graus. �Atenci�n! No usar una rampa inclinada m�s de 10 grados Varning! Anv�nd inte ramp med en lutning p� mer �n 10 grader.
Rack-Mounting and Cabinet-Mounting Warnings
Ensure that the rack or cabinet in which the device is installed is evenly and securely supported. Uneven mechanical loading could lead to a hazardous condition.

154

155
WARNING: To prevent bodily injury when mounting or servicing the device in a rack, take the following precautions to ensure that the system remains stable. The following directives help maintain your safety:
� The device must be installed in a rack that is secured to the building structure. � The device should be mounted at the bottom of the rack if it is the only unit in the
rack.
� When mounting the device on a partially filled rack, load the rack from the bottom to the top with the heaviest component at the bottom of the rack.
� If the rack is provided with stabilizing equipment, install the stabilizers before mounting or servicing the device in the rack.
Waarschuwing Om lichamelijk letsel te voorkomen wanneer u dit toestel in een rek monteert of het daar een servicebeurt geeft, moet u speciale voorzorgsmaatregelen nemen om ervoor te zorgen dat het toestel stabiel blijft. De onderstaande richtlijnen worden verstrekt om uw veiligheid te verzekeren:
� De Juniper Networks switch moet in een stellage worden ge�nstalleerd die aan een bouwsel is verankerd.
� Dit toestel dient onderaan in het rek gemonteerd te worden als het toestel het enige in het rek is.
� Wanneer u dit toestel in een gedeeltelijk gevuld rek monteert, dient u het rek van onderen naar boven te laden met het zwaarste onderdeel onderaan in het rek.
� Als het rek voorzien is van stabiliseringshulpmiddelen, dient u de stabilisatoren te monteren voordat u het toestel in het rek monteert of het daar een servicebeurt geeft.
Varoitus Kun laite asetetaan telineeseen tai huolletaan sen ollessa telineess�, on noudatettava erityisi� varotoimia j�rjestelm�n vakavuuden s�ilytt�miseksi, jotta v�ltyt��n loukkaantumiselta. Noudata seuraavia turvallisuusohjeita:
� Juniper Networks switch on asennettava telineeseen, joka on kiinnitetty rakennukseen.
� Jos telineess� ei ole muita laitteita, aseta laite telineen alaosaan. � Jos laite asetetaan osaksi t�ytettyyn telineeseen, aloita kuormittaminen sen alaosasta
kaikkein raskaimmalla esineell� ja siirry sitten sen yl�osaan.
� Jos telinett� varten on vakaimet, asenna ne ennen laitteen asettamista telineeseen tai sen huoltamista siin�.

156
Attention Pour �viter toute blessure corporelle pendant les op�rations de montage ou de r�paration de cette unit� en casier, il convient de prendre des pr�cautions sp�ciales afin de maintenir la stabilit� du syst�me. Les directives ci-dessous sont destin�es � assurer la protection du personnel:
� Le rack sur lequel est mont� le Juniper Networks switch doit �tre fix� � la structure du b�timent.
� Si cette unit� constitue la seule unit� mont�e en casier, elle doit �tre plac�e dans le bas.
� Si cette unit� est mont�e dans un casier partiellement rempli, charger le casier de bas en haut en pla�ant l'�l�ment le plus lourd dans le bas.
� Si le casier est �quip� de dispositifs stabilisateurs, installer les stabilisateurs avant de monter ou de r�parer l'unit� en casier.
Warnung Zur Vermeidung von K�rperverletzung beim Anbringen oder Warten dieser Einheit in einem Gestell m�ssen Sie besondere Vorkehrungen treffen, um sicherzustellen, da� das System stabil bleibt. Die folgenden Richtlinien sollen zur Gew�hrleistung Ihrer Sicherheit dienen:
� Der Juniper Networks switch mu� in einem Gestell installiert werden, das in der Geb�udestruktur verankert ist.
� Wenn diese Einheit die einzige im Gestell ist, sollte sie unten im Gestell angebracht werden.
� Bei Anbringung dieser Einheit in einem zum Teil gef�llten Gestell ist das Gestell von unten nach oben zu laden, wobei das schwerste Bauteil unten im Gestell anzubringen ist.
� Wird das Gestell mit Stabilisierungszubeh�r geliefert, sind zuerst die Stabilisatoren zu installieren, bevor Sie die Einheit im Gestell anbringen oder sie warten.
Avvertenza Per evitare infortuni fisici durante il montaggio o la manutenzione di questa unit� in un supporto, occorre osservare speciali precauzioni per garantire che il sistema rimanga stabile. Le seguenti direttive vengono fornite per garantire la sicurezza personale:

157
� Il Juniper Networks switch deve essere installato in un telaio, il quale deve essere fissato alla struttura dell'edificio.
� Questa unit� deve venire montata sul fondo del supporto, se si tratta dell'unica unit� da montare nel supporto.
� Quando questa unit� viene montata in un supporto parzialmente pieno, caricare il supporto dal basso all'alto, con il componente pi� pesante sistemato sul fondo del supporto.
� Se il supporto � dotato di dispositivi stabilizzanti, installare tali dispositivi prima di montare o di procedere alla manutenzione dell'unit� nel supporto.
Advarsel Unng� fysiske skader under montering eller reparasjonsarbeid p� denne enheten n�r den befinner seg i et kabinett. V�r n�ye med at systemet er stabilt. F�lgende retningslinjer er gitt for � verne om sikkerheten:
� Juniper Networks switch m� installeres i et stativ som er forankret til bygningsstrukturen.
� Denne enheten b�r monteres nederst i kabinettet hvis dette er den eneste enheten i kabinettet.
� Ved montering av denne enheten i et kabinett som er delvis fylt, skal kabinettet lastes fra bunnen og opp med den tyngste komponenten nederst i kabinettet.
� Hvis kabinettet er utstyrt med stabiliseringsutstyr, skal stabilisatorene installeres f�r montering eller utf�ring av reparasjonsarbeid p� enheten i kabinettet.
Aviso Para se prevenir contra danos corporais ao montar ou reparar esta unidade numa estante, dever� tomar precau�es especiais para se certificar de que o sistema possui um suporte est�vel. As seguintes directrizes ajud�-lo-�o a efectuar o seu trabalho com seguran�a:
� O Juniper Networks switch dever� ser instalado numa prateleira fixa � estrutura do edificio.
� Esta unidade dever� ser montada na parte inferior da estante, caso seja esta a �nica unidade a ser montada.
� Ao montar esta unidade numa estante parcialmente ocupada, coloque os itens mais pesados na parte inferior da estante, arrumando-os de baixo para cima.
� Se a estante possuir um dispositivo de estabiliza��o, instale-o antes de montar ou reparar a unidade.
�Atenci�n! Para evitar lesiones durante el montaje de este equipo sobre un bastidor, oeriormente durante su mantenimiento, se debe poner mucho cuidado en que el sistema quede bien estable. Para garantizar su seguridad, proceda seg�n las siguientes instrucciones:

158
� El Juniper Networks switch debe instalarse en un bastidor fijado a la estructura del edificio.
� Colocar el equipo en la parte inferior del bastidor, cuando sea la �nica unidad en el mismo.
� Cuando este equipo se vaya a instalar en un bastidor parcialmente ocupado, comenzar la instalaci�n desde la parte inferior hacia la superior colocando el equipo m�s pesado en la parte inferior.
� Si el bastidor dispone de dispositivos estabilizadores, instalar �stos antes de montar o proceder al mantenimiento del equipo instalado en el bastidor.
Varning! F�r att undvika kroppsskada n�r du installerar eller utf�r underh�llsarbete p� denna enhet p� en st�llning m�ste du vidta s�rskilda f�rsiktighets�tg�rder f�r att f�rs�kra dig om att systemet st�r stadigt. F�ljande riktlinjer ges f�r att trygga din s�kerhet: � Juniper Networks switch m�ste installeras i en st�llning som �r f�rankrad i byggnadens
struktur. � Om denna enhet �r den enda enheten p� st�llningen skall den installeras l�ngst ned
p� st�llningen. � Om denna enhet installeras p� en delvis fylld st�llning skall st�llningen fyllas nedifr�n
och upp, med de tyngsta enheterna l�ngst ned p� st�llningen. � Om st�llningen �r f�rsedd med stabiliseringsdon skall dessa monteras fast innan
enheten installeras eller underh�lls p� st�llningen.
Laser and LED Safety Guidelines and Warnings
IN THIS SECTION
General Laser Safety Guidelines | 159 Class 1 Laser Product Warning | 160 Class 1 LED Product Warning | 161 Laser Beam Warning | 162

159
Juniper Networks devices are equipped with laser transmitters, which are considered a Class 1 Laser Product by the U.S. Food and Drug Administration and are evaluated as a Class 1 Laser Product per EN 60825-1 requirements. Observe the following guidelines and warnings:
General Laser Safety Guidelines
When working around ports that support optical transceivers, observe the following safety guidelines to prevent eye injury: � Do not look into unterminated ports or at fibers that connect to unknown sources. � Do not examine unterminated optical ports with optical instruments. � Avoid direct exposure to the beam.
WARNING: Unterminated optical connectors can emit invisible laser radiation. The lens in the human eye focuses all the laser power on the retina, so focusing the eye directly on a laser source--even a low-power laser--could permanently damage the eye.

160
Class 1 Laser Product Warning
WARNING: Class 1 laser product. Waarschuwing Klasse-1 laser produkt. Varoitus Luokan 1 lasertuote. Attention Produit laser de classe I. Warnung Laserprodukt der Klasse 1. Avvertenza Prodotto laser di Classe 1. Advarsel Laserprodukt av klasse 1. Aviso Produto laser de classe 1. �Atenci�n! Producto l�ser Clase I. Varning! Laserprodukt av klass 1.

161
Class 1 LED Product Warning
WARNING: Class 1 LED product. Waarschuwing Klasse 1 LED-product. Varoitus Luokan 1 valodiodituote. Attention Alarme de produit LED Class I. Warnung Class 1 LED-Produktwarnung. Avvertenza Avvertenza prodotto LED di Classe 1. Advarsel LED-produkt i klasse 1. Aviso Produto de classe 1 com LED. �Atenci�n! Aviso sobre producto LED de Clase 1. Varning! Lysdiodprodukt av klass 1.

162
Laser Beam Warning
WARNING: Do not stare into the laser beam or view it directly with optical instruments. Waarschuwing Niet in de straal staren of hem rechtstreeks bekijken met optische instrumenten. Varoitus �l� katso s�teeseen �l�k� tarkastele sit� suoraan optisen laitteen avulla. Attention Ne pas fixer le faisceau des yeux, ni l'observer directement � l'aide d'instruments optiques. Warnung Nicht direkt in den Strahl blicken und ihn nicht direkt mit optischen Ger�ten pr�fen. Avvertenza Non fissare il raggio con gli occhi n� usare strumenti ottici per osservarlo direttamente. Advarsel Stirr eller se ikke direkte p strlen med optiske instrumenter. Aviso N�o olhe fixamente para o raio, nem olhe para ele directamente com instrumentos �pticos. �Atenci�n! No mirar fijamente el haz ni observarlo directamente con instrumentos �pticos. Varning! Rikta inte blicken in mot str�len och titta inte direkt p� den genom optiska instrument.

163
Radiation from Open Port Apertures Warning
WARNING: Because invisible radiation might be emitted from the aperture of the port when no fiber cable is connected, avoid exposure to radiation and do not stare into open apertures.
Waarschuwing Aangezien onzichtbare straling vanuit de opening van de poort kan komen als er geen fiberkabel aangesloten is, dient blootstelling aan straling en het kijken in open openingen vermeden te worden.
Varoitus Koska portin aukosta voi emittoitua n�kym�t�nt� s�teily�, kun kuitukaapelia ei ole kytkettyn�, v�lt� s�teilylle altistumista �l�k� katso avoimiin aukkoihin.
Attention Des radiations invisibles � l'il nu pouvant traverser l'ouverture du port lorsqu'aucun c�ble en fibre optique n'y est connect�, il est recommand� de ne pas regarder fixement l'int�rieur de ces ouvertures.
Warnung Aus der Port-�ffnung k�nnen unsichtbare Strahlen emittieren, wenn kein Glasfaserkabel angeschlossen ist. Vermeiden Sie es, sich den Strahlungen auszusetzen, und starren Sie nicht in die �ffnungen!
Avvertenza Quando i cavi in fibra non sono inseriti, radiazioni invisibili possono essere emesse attraverso l'apertura della porta. Evitate di esporvi alle radiazioni e non guardate direttamente nelle aperture.
Advarsel Unng� utsettelse for str�ling, og stirr ikke inn i �pninger som er �pne, fordi usynlig str�ling kan emiteres fra portens �pning n�r det ikke er tilkoblet en fiberkabel.
Aviso Dada a possibilidade de emiss�o de radia��o invis�vel atrav�s do orif�cio da via de acesso, quando esta n�o tiver nenhum cabo de fibra conectado, dever� evitar an EXposi��o � radia��o e n�o dever� olhar fixamente para orif�cios que se encontrarem a descoberto.
�Atenci�n! Debido a que la apertura del puerto puede emitir radiaci�n invisible cuando no existe un cable de fibra conectado, evite mirar directamente a las aperturas para no exponerse a la radiaci�n.
Varning! Osynlig str�lning kan avges fr�n en port�ppning utan ansluten fiberkabel och du b�r d�rf�r undvika att bli utsatt f�r str�lning genom att inte stirra in i oskyddade �ppningar.

164
Maintenance and Operational Safety Guidelines and Warnings
IN THIS SECTION Battery Handling Warning | 165 Jewelry Removal Warning | 166 Lightning Activity Warning | 168 Operating Temperature Warning | 169 Product Disposal Warning | 171
While performing the maintenance activities for devices, observe the following guidelines and warnings:

165
Battery Handling Warning
WARNING: Replacing a battery incorrectly might result in an explosion. Replace a battery only with the same or equivalent type recommended by the manufacturer. Dispose of used batteries according to the manufacturer's instructions.
Waarschuwing Er is ontploffingsgevaar als de batterij verkeerd vervangen wordt. Vervang de batterij slechts met hetzelfde of een equivalent type dat door de fabrikant aanbevolen is. Gebruikte batterijen dienen overeenkomstig fabrieksvoorschriften weggeworpen te worden.
Varoitus R�j�hdyksen vaara, jos akku on vaihdettu v��r��n akkuun. K�yt� vaihtamiseen ainoastaan saman- tai vastaavantyyppist� akkua, joka on valmistajan suosittelema. H�vit� k�ytetyt akut valmistajan ohjeiden mukaan.
Attention Danger d'explosion si la pile n'est pas remplac�e correctement. Ne la remplacer que par une pile de type semblable ou �quivalent, recommand�e par le fabricant. Jeter les piles usag�es conform�ment aux instructions du fabricant.
Warnung Bei Einsetzen einer falschen Batterie besteht Explosionsgefahr. Ersetzen Sie die Batterie nur durch den gleichen oder vom Hersteller empfohlenen Batterietyp. Entsorgen Sie die benutzten Batterien nach den Anweisungen des Herstellers.
Advarsel Det kan v�re fare for eksplosjon hvis batteriet skiftes p� feil m�te. Skift kun med samme eller tilsvarende type som er anbefalt av produsenten. Kasser brukte batterier i henhold til produsentens instruksjoner.
Avvertenza Pericolo di esplosione se la batteria non � installata correttamente. Sostituire solo con una di tipo uguale o equivalente, consigliata dal produttore. Eliminare le batterie usate secondo le istruzioni del produttore.
Aviso Existe perigo de explos�o se a bateria for substitu�da incorrectamente. Substitua a bateria por uma bateria igual ou de um tipo equivalente recomendado pelo fabricante. Destrua as baterias usadas conforme as instru�es do fabricante.
�Atenci�n! Existe peligro de explosi�n si la bater�a se reemplaza de manera incorrecta. Reemplazar la bater�an EXclusivamente con el mismo tipo o el equivalente recomendado por el fabricante. Desechar las bater�as gastadas seg�n las instrucciones del fabricante.
Varning! Explosionsfara vid felaktigt batteribyte. Ers�tt endast batteriet med samma batterityp som rekommenderas av tillverkaren eller motsvarande. F�lj tillverkarens anvisningar vid kassering av anv�nda batterier.

166
Jewelry Removal Warning

167
WARNING: Before working on equipment that is connected to power lines, remove jewelry, including rings, necklaces, and watches. Metal objects heat up when connected to power and ground and can cause serious burns or can be welded to the terminals.
Waarschuwing Alvorens aan apparatuur te werken die met elektrische leidingen is verbonden, sieraden (inclusief ringen, kettingen en horloges) verwijderen. Metalen voorwerpen worden warm wanneer ze met stroom en aarde zijn verbonden, en kunnen ernstige brandwonden veroorzaken of het metalen voorwerp aan de aansluitklemmen lassen.
Varoitus Ennen kuin ty�skentelet voimavirtajohtoihin kytkettyjen laitteiden parissa, ota pois kaikki korut (sormukset, kaulakorut ja kellot mukaan lukien). Metalliesineet kuumenevat, kun ne ovat yhteydess� s�hk�virran ja maan kanssa, ja ne voivat aiheuttaa vakavia palovammoja tai hitsata metalliesineet kiinni liit�nt�napoihin.
Attention Avant d'acc�der � cet �quipement connect� aux lignes �lectriques, �ter tout bijou (anneaux, colliers et montres compris). Lorsqu'ils sont branch�s � l'alimentation et reli�s � la terre, les objets m�talliques chauffent, ce qui peut provoquer des blessures graves ou souder l'objet m�tallique aux bornes.
Warnung Vor der Arbeit an Ger�ten, die an das Netz angeschlossen sind, jeglichen Schmuck (einschlie�lich Ringe, Ketten und Uhren) abnehmen. Metallgegenst�nde erhitzen sich, wenn sie an das Netz und die Erde angeschlossen werden, und k�nnen schwere Verbrennungen verursachen oder an die Anschlu�klemmen angeschwei�t werden.
Avvertenza Prima di intervenire su apparecchiature collegate alle linee di alimentazione, togliersi qualsiasi monile (inclusi anelli, collane, braccialetti ed orologi). Gli oggetti metallici si riscaldano quando sono collegati tra punti di alimentazione e massa: possono causare ustioni gravi oppure il metallo pu� saldarsi ai terminali.
Advarsel Fjern alle smykker (inkludert ringer, halskjeder og klokker) f�r du skal arbeide p� utstyr som er koblet til kraftledninger. Metallgjenstander som er koblet til kraftledninger og jord blir sv�rt varme og kan for�rsake alvorlige brannskader eller smelte fast til polene.
Aviso Antes de trabalhar em equipamento que esteja ligado a linhas de corrente, retire todas as j�ias que estiver a usar (incluindo an�is, fios e rel�gios). Os objectos met�licos aquecer�o em contacto com a corrente e em contacto com a liga��o � terra, podendo causar queimaduras graves ou ficarem soldados aos terminais.
�Atenci�n! Antes de operar sobre equipos conectados a l�neas de alimentaci�n, quitarse las joyas (incluidos anillos, collares y relojes). Los objetos de metal se calientan cuando

168
se conectan a la alimentaci�n y a tierra, lo que puede ocasionar quemaduras graves o que los objetos met�licos queden soldados a los bornes. Varning! Tag av alla smycken (inklusive ringar, halsband och armbandsur) innan du arbetar p� utrustning som �r kopplad till kraftledningar. Metallobjekt hettas upp n�r de kopplas ihop med str�m och jord och kan f�rorsaka allvarliga br�nnskador; metallobjekt kan ocks� sammansvetsas med kontakterna.
Lightning Activity Warning
WARNING: Do not work on the system or connect or disconnect cables during periods of lightning activity. Waarschuwing Tijdens onweer dat gepaard gaat met bliksem, dient u niet aan het systeem te werken of kabels aan te sluiten of te ontkoppelen. Varoitus �l� ty�skentele j�rjestelm�n parissa �l�k� yhdist� tai irrota kaapeleita ukkosilmalla. Attention Ne pas travailler sur le syst�me ni brancher ou d�brancher les c�bles pendant un orage. Warnung Arbeiten Sie nicht am System und schlie�en Sie keine Kabel an bzw. trennen Sie keine ab, wenn es gewittert. Avvertenza Non lavorare sul sistema o collegare oppure scollegare i cavi durante un temporale con fulmini. Advarsel Utf�r aldri arbeid p� systemet, eller koble kabler til eller fra systemet n�r det tordner eller lyner. Aviso N�o trabalhe no sistema ou ligue e desligue cabos durante per�odos de mau tempo (trovoada). �Atenci�n! No operar el sistema ni conectar o desconectar cables durante el transcurso de descargas el�ctricas en la atm�sfera. Varning! Vid �ska skall du aldrig utf�ra arbete p� systemet eller ansluta eller koppla loss kablar.

169
Operating Temperature Warning

170
WARNING: To prevent the device from overheating, do not operate it in an area that exceeds the maximum recommended ambient temperature. To prevent airflow restriction, allow at least 6 in. (15.2 cm) of clearance around the ventilation openings.
Waarschuwing Om te voorkomen dat welke switch van de Juniper Networks router dan ook oververhit raakt, dient u deze niet te bedienen op een plaats waar de maximale aanbevolen omgevingstemperatuur van 40� C wordt overschreden. Om te voorkomen dat de luchtstroom wordt beperkt, dient er minstens 15,2 cm speling rond de ventilatie-openingen te zijn.
Varoitus Ettei Juniper Networks switch-sarjan reititin ylikuumentuisi, sit� ei saa k�ytt�� tilassa, jonka l�mp�tila ylitt�� korkeimman suositellun ymp�rist�l�mp�tilan 40� C. Ettei ilmanvaihto estyisi, tuuletusaukkojen ymp�rille on j�tett�v� ainakin 15,2 cm tilaa.
Attention Pour �viter toute surchauffe des routeurs de la gamme Juniper Networks switch, ne l'utilisez pas dans une zone o� la temp�rature ambiante est sup�rieure � 40� C. Pour permettre un flot d'air constant, d�gagez un espace d'au moins 15,2 cm autour des ouvertures de ventilations.
Warnung Um einen Router der switch vor �berhitzung zu sch�tzen, darf dieser nicht in einer Gegend betrieben werden, in der die Umgebungstemperatur das empfohlene Maximum von 40� C �berschreitet. Um L�ftungsverschlu� zu verhindern, achten Sie darauf, da� mindestens 15,2 cm lichter Raum um die L�ftungs�ffnungen herum frei bleibt.
Avvertenza Per evitare il surriscaldamento dei switch, non adoperateli in un locale che ecceda la temperatura ambientale massima di 40� C. Per evitare che la circolazione dell'aria sia impedita, lasciate uno spazio di almeno 15.2 cm di fronte alle aperture delle ventole.
Advarsel Unng� overoppheting av eventuelle rutere i Juniper Networks switch Disse skal ikke brukes p� steder der den anbefalte maksimale omgivelsestemperaturen overstiger 40� C (104� F). S�rg for at klaringen rundt lufte�pningene er minst 15,2 cm (6 tommer) for � forhindre nedsatt luftsirkulasjon.
Aviso Para evitar o sobreaquecimento do encaminhador Juniper Networks switch, n�o utilize este equipamento numa �rea que exceda a temperatura m�xima recomendada de 40� C. Para evitar a restri��o � circula��o de ar, deixe pelo menos um espa�o de 15,2 cm � volta das aberturas de ventila��o.
�Atenci�n! Para impedir que un encaminador de la serie Juniper Networks switch se recaliente, no lo haga funcionar en un �rea en la que se supere la temperatura ambiente m�xima recomendada de 40� C. Para impedir la restricci�n de la entrada de aire, deje un espacio m�nimo de 15,2 cm alrededor de las aperturas para ventilaci�n.

171
Varning! F�rhindra att en Juniper Networks switch �verhettas genom att inte anv�nda den i ett omr�de d�r den maximalt rekommenderade omgivningstemperaturen p� 40� C �verskrids. F�rhindra att luftcirkulationen inskr�nks genom att se till att det finns fritt utrymme p� minst 15,2 cm omkring ventilations�ppningarna.
Product Disposal Warning
WARNING: Disposal of this device must be handled according to all national laws and regulations. Waarschuwing Dit produkt dient volgens alle landelijke wetten en voorschriften te worden afgedankt. Varoitus T�m�n tuotteen lopullisesta h�vitt�misest� tulee huolehtia kaikkia valtakunnallisia lakeja ja s��nn�ksi� noudattaen. Attention La mise au rebut d�finitive de ce produit doit �tre effectu�e conform�ment � toutes les lois et r�glementations en vigueur. Warnung Dieses Produkt mu� den geltenden Gesetzen und Vorschriften entsprechend entsorgt werden. Avvertenza L'eliminazione finale di questo prodotto deve essere eseguita osservando le normative italiane vigenti in materia Advarsel Endelig disponering av dette produktet m� skje i henhold til nasjonale lover og forskrifter. Aviso A descartagem final deste produto dever� ser efectuada de acordo com os regulamentos e a legisla��o nacional. �Atenci�n! El desecho final de este producto debe realizarse seg�n todas las leyes y regulaciones nacionales Varning! Slutlig kassering av denna produkt b�r sk�tas i enlighet med landets alla lagar och f�reskrifter.

172
General Electrical Safety Guidelines and Warnings
WARNING: Certain ports on the device are designed for use as intrabuilding (within-the-building) interfaces only (Type 2 or Type 4 ports as described in GR-1089-CORE) and require isolation from the exposed outside plant (OSP) cabling. To comply with NEBS requirements and protect against lightning surges and commercial power disturbances, the intrabuilding ports must not be metallically connected to interfaces that connect to the OSP or its wiring. The intrabuilding ports on the device are suitable for connection to intrabuilding or unexposed wiring or cabling only. The addition of primary protectors is not sufficient protection for connecting these interfaces metallically to OSP wiring.
CAUTION: Before removing or installing components of a device, connect an electrostatic discharge (ESD) grounding strap to an ESD point and wrap and fasten the other end of the strap around your bare wrist. Failure to use an ESD grounding strap could result in damage to the device.
� Install the device in compliance with the following local, national, and international electrical codes: � United States--National Fire Protection Association (NFPA 70), United States National Electrical Code. � Other countries--International Electromechanical Commission (IEC) 60364, Part 1 through Part 7. � Evaluated to the TN power system. � Canada--Canadian Electrical Code, Part 1, CSA C22.1. � Suitable for installation in Information Technology Rooms in accordance with Article 645 of the National Electrical Code and NFPA 75. Peut �tre install� dans des salles de mat�riel de traitement de l'information conform�ment � l'article 645 du National Electrical Code et � la NFPA 75.
� Locate the emergency power-off switch for the room in which you are working so that if an electrical accident occurs, you can quickly turn off the power.
� Make sure that grounding surfaces are cleaned and brought to a bright finish before grounding connections are made.
� Do not work alone if potentially hazardous conditions exist anywhere in your workspace. � Never assume that power is disconnected from a circuit. Always check the circuit before starting to
work.

173
� Carefully look for possible hazards in your work area, such as moist floors, ungrounded power extension cords, and missing safety grounds.
� Operate the device within marked electrical ratings and product usage instructions. � To ensure that the device and peripheral equipment function safely and correctly, use the cables and
connectors specified for the attached peripheral equipment, and make certain they are in good condition. You can remove and replace many device components without powering off or disconnecting power to the device, as detailed elsewhere in the hardware documentation for this device. Never install equipment that appears to be damaged.
Prevention of Electrostatic Discharge Damage
Device components that are shipped in antistatic bags are sensitive to damage from static electricity. Some components can be impaired by voltages as low as 30 V. You can easily generate potentially damaging static voltages whenever you handle plastic or foam packing material or if you move components across plastic or carpets. Observe the following guidelines to minimize the potential for electrostatic discharge (ESD) damage, which can cause intermittent or complete component failures: � Always use an ESD wrist strap when you are handling components that are subject to ESD damage, and
make sure that it is in direct contact with your skin. If a grounding strap is not available, hold the component in its antistatic bag (see Figure 61 on page 174) in one hand and touch the exposed, bare metal of the device with the other hand immediately before inserting the component into the device.
WARNING: For safety, periodically check the resistance value of the ESD grounding strap. The measurement must be in the range 1 through 10 Mohms.
� When handling any component that is subject to ESD damage and that is removed from the device, make sure the equipment end of your ESD wrist strap is attached to the ESD point on the chassis. If no grounding strap is available, touch the exposed, bare metal of the device to ground yourself before handling the component.
� Avoid contact between the component that is subject to ESD damage and your clothing. ESD voltages emitted from clothing can damage components.
� When removing or installing a component that is subject to ESD damage, always place it component-side up on an antistatic surface, in an antistatic card rack, or in an antistatic bag (see Figure 61 on page 174). If you are returning a component, place it in an antistatic bag before packing it.

Figure 61: Placing a Component into an Antistatic Bag
CAUTION
ELECTROSTATIC SENSITIVE DEVICES
DO NOT OPEN OR HANDLE EXCEPT AT A
STATIC-FREE WORKSTATION

174

5 4 3

SFP

6xGE

CAUTION: ANSI/TIA/EIA-568 cables such as Category 5e and Category 6 can get electrostatically charged. To dissipate this charge, always ground the cables to a suitable and safe earth ground before connecting them to the system.

Site Electrical Wiring Guidelines
Table 39 on page 175 describes the factors you must consider while planning the electrical wiring at your site.
WARNING: You must provide a properly grounded and shielded environment and use electrical surge-suppression devices.

175

Table 39: Site Electrical Wiring Guidelines

Site Wiring Factor

Guidelines

Signaling limitations

If your site experiences any of the following problems, consult experts in electrical surge suppression and shielding:

� Improperly installed wires cause radio frequency interference (RFI). � Damage from lightning strikes occurs when wires exceed recommended distances or pass between
buildings.
� Electromagnetic pulses (EMPs) caused by lightning damage unshielded conductors and electronic devices.

Radio frequency interference

To reduce or eliminate RFI from your site wiring, do the following:
� Use a twisted-pair cable with a good distribution of grounding conductors. � If you must exceed the recommended distances, use a high-quality twisted-pair cable with one
ground conductor for each data signal when applicable.

Electromagnetic If your site is susceptible to problems with electromagnetic compatibility (EMC), particularly from compatibility lightning or radio transmitters, seek expert advice.

Some of the problems caused by strong sources of electromagnetic interference (EMI) are:

� Destruction of the signal drivers and receivers in the device � Electrical hazards as a result of power surges conducted over the lines into the equipment

AC Power Electrical Safety Guidelines
The following electrical safety guidelines apply to AC-powered devices:
� Note the following warnings printed on the device: "CAUTION: THIS UNIT HAS MORE THAN ONE POWER SUPPLY CORD. DISCONNECT ALL POWER SUPPLY CORDS BEFORE SERVICING TO AVOID ELECTRIC SHOCK." "ATTENTION: CET APPAREIL COMPORTE PLUS D'UN CORDON D'ALIMENTATION. AFIN DE PR�VENIR LES CHOCS �LECTRIQUES, D�BRANCHER TOUT CORDON D'ALIMENTATION AVANT DE FAIRE LE D�PANNAGE."
� AC-powered devices are shipped with a three-wire electrical cord with a grounding-type plug that fits only a grounding-type power outlet. Do not circumvent this safety feature. Equipment grounding must comply with local and national electrical codes.

176
� You must provide an external certified circuit breaker (2-pole circuit breaker or 4-pole circuit breaker based on your device) rated minimum 20 A in the building installation.
� The power cord serves as the main disconnecting device for the AC-powered device. The socket outlet must be near the AC-powered device and be easily accessible.
� For devices that have more than one power supply connection, you must ensure that all power connections are fully disconnected so that power to the device is completely removed to prevent electric shock. To disconnect power, unplug all power cords (one for each power supply).
Power Cable Warning (Japanese)
WARNING: The attached power cable is only for this product. Do not use the cable for another product.

177
AC Power Disconnection Warning
WARNING: Before working on the device or near power supplies, unplug all the power cords from an AC-powered device. Waarschuwing Voordat u aan een frame of in de nabijheid van voedingen werkt, dient u bij wisselstroom toestellen de stekker van het netsnoer uit het stopcontact te halen. Varoitus Kytke irti vaihtovirtalaitteiden virtajohto, ennen kuin teet mit��n asennuspohjalle tai ty�skentelet virtal�hteiden l�heisyydess�. Attention Avant de travailler sur un ch�ssis ou � proximit� d'une alimentation �lectrique, d�brancher le cordon d'alimentation des unit�s en courant alternatif. Warnung Bevor Sie an einem Chassis oder in der N�he von Netzger�ten arbeiten, ziehen Sie bei Wechselstromeinheiten das Netzkabel ab bzw. Avvertenza Prima di lavorare su un telaio o intorno ad alimentatori, scollegare il cavo di alimentazione sulle unit� CA. Advarsel F�r det utf�res arbeid p� kabinettet eller det arbeides i n�rheten av str�mforsyningsenheter, skal str�mledningen trekkes ut p� vekselstr�msenheter. Aviso Antes de trabalhar num chassis, ou antes de trabalhar perto de unidades de fornecimento de energia, desligue o cabo de alimenta��o nas unidades de corrente alternada. �Atenci�n! Antes de manipular el chasis de un equipo o trabajar cerca de una fuente de alimentaci�n, desenchufar el cable de alimentaci�n en los equipos de corriente alterna (CA). Varning! Innan du arbetar med ett chassi eller n�ra str�mf�rs�rjningsenheter skall du f�r v�xelstr�msenheter dra ur n�tsladden.

178
DC Power Disconnection Warning

179
WARNING: Before performing any of the DC power procedures, ensure that power is removed from the DC circuit. To ensure that all power is off, locate the circuit breaker on the panel board that services the DC circuit, switch the circuit breaker to the OFF position, and tape the device handle of the circuit breaker in the OFF position.
Waarschuwing Voordat u een van de onderstaande procedures uitvoert, dient u te controleren of de stroom naar het gelijkstroom circuit uitgeschakeld is. Om u ervan te verzekeren dat alle stroom UIT is geschakeld, kiest u op het schakelbord de stroomverbreker die het gelijkstroom circuit bedient, draait de stroomverbreker naar de UIT positie en plakt de schakelaarhendel van de stroomverbreker met plakband in de UIT positie vast.
Varoitus Varmista, ett� tasavirtapiiriss� ei ole virtaa ennen seuraavien toimenpiteiden suorittamista. Varmistaaksesi, ett� virta on KATKAISTU t�ysin, paikanna tasavirrasta huolehtivassa kojetaulussa sijaitseva suojakytkin, k��nn� suojakytkin KATKAISTU-asentoon ja teippaa suojakytkimen varsi niin, ett� se pysyy KATKAISTU-asennossa.
Attention Avant de pratiquer l'une quelconque des proc�dures ci-dessous, v�rifier que le circuit en courant continu n'est plus sous tension. Pour en �tre s�r, localiser le disjoncteur situ� sur le panneau de service du circuit en courant continu, placer le disjoncteur en position ferm�e (OFF) et, � l'aide d'un ruban adh�sif, bloquer la poign�e du disjoncteur en position OFF.
Warnung Vor Ausf�hrung der folgenden Vorg�nge ist sicherzustellen, da� die Gleichstromschaltung keinen Strom erh�lt. Um sicherzustellen, da� s�mtlicher Strom abgestellt ist, machen Sie auf der Schalttafel den Unterbrecher f�r die Gleichstromschaltung ausfindig, stellen Sie den Unterbrecher auf AUS, und kleben Sie den Schaltergriff des Unterbrechers mit Klebeband in der AUS-Stellung fest.
Avvertenza Prima di svolgere una qualsiasi delle procedure seguenti, verificare che il circuito CC non sia alimentato. Per verificare che tutta l'alimentazione sia scollegata (OFF), individuare l'interruttore automatico sul quadro strumenti che alimenta il circuito CC, mettere l'interruttore in posizione OFF e fissarlo con nastro adesivo in tale posizione.
Advarsel F�r noen av disse prosedyrene utf�res, kontroller at str�mmen er frakoblet likestr�mkretsen. S�rg for at all str�m er sl�tt AV. Dette gj�res ved � lokalisere str�mbryteren p� brytertavlen som betjener likestr�mkretsen, sl� str�mbryteren AV og teipe bryterh�ndtaket p� str�mbryteren i AV-stilling.
Aviso Antes de executar um dos seguintes procedimentos, certifique-se que desligou a fonte de alimenta��o de energia do circuito de corrente cont�nua. Para se assegurar

180
que toda a corrente foi DESLIGADA, localize o disjuntor no painel que serve o circuito de corrente cont�nua e coloque-o na posi��o OFF (Desligado), segurando nessa posi��o a manivela do interruptor do disjuntor com fita isoladora. �Atenci�n! Antes de proceder con los siguientes pasos, comprobar que la alimentaci�n del circuito de corriente continua (CC) est� cortada (OFF). Para asegurarse de que toda la alimentaci�n est� cortada (OFF), localizar el interruptor autom�tico en el panel que alimenta al circuito de corriente continua, cambiar el interruptor autom�tico a la posici�n de Apagado (OFF), y sujetar con cinta la palanca del interruptor autom�tico en posici�n de Apagado (OFF). Varning! Innan du utf�r n�gon av f�ljande procedurer m�ste du kontrollera att str�mf�rs�rjningen till likstr�mskretsen �r bruten. Kontrollera att all str�mf�rs�rjning �r BRUTEN genom att sl� AV det �versp�nningsskydd som skyddar likstr�mskretsen och tejpa fast �versp�nningsskyddets omkopplare i FR�N-l�get.
DC Power Grounding Requirements and Warning
An insulated grounding conductor that is identical in size to the grounded and ungrounded branch circuit supply conductors but is identifiable by green and yellow stripes is installed as part of the branch circuit that supplies the device. The grounding conductor is a separately derived system at the supply transformer or motor generator set.

181
WARNING: When you install the device, the ground connection must always be made first and disconnected last. Waarschuwing Bij de installatie van het toestel moet de aardverbinding altijd het eerste worden gemaakt en het laatste worden losgemaakt. Varoitus Laitetta asennettaessa on maahan yhdist�minen aina teht�v� ensiksi ja maadoituksen irti kytkeminen viimeiseksi. Attention Lors de l'installation de l'appareil, la mise � la terre doit toujours �tre connect�e en premier et d�connect�e en dernier. Warnung Der Erdanschlu� mu� bei der Installation der Einheit immer zuerst hergestellt und zuletzt abgetrennt werden. Avvertenza In fase di installazione dell'unit�, eseguire sempre per primo il collegamento a massa e disconnetterlo per ultimo. Advarsel N�r enheten installeres, m� jordledningen alltid tilkobles f�rst og frakobles sist. Aviso Ao instalar a unidade, a liga��o � terra dever� ser sempre a primeira a ser ligada, e a �ltima a ser desligada. �Atenci�n! Al instalar el equipo, conectar la tierra la primera y desconectarla la �ltima. Varning! Vid installation av enheten m�ste jordledningen alltid anslutas f�rst och kopplas bort sist.

182
DC Power Wiring Sequence Warning

183
WARNING: Wire the DC power supply using the appropriate lugs. When connecting power, the proper wiring sequence is ground to ground, +RTN to +RTN, then �48 V to �48 V. When disconnecting power, the proper wiring sequence is �48 V to �48 V, +RTN to +RTN, then ground to ground. Note that the ground wire must always be connected first and disconnected last.
Waarschuwing De juiste bedradingsvolgorde verbonden is aarde naar aarde, +RTN naar +RTN, en �48 V naar � 48 V. De juiste bedradingsvolgorde losgemaakt is en �48 naar �48 V, +RTN naar +RTN, aarde naar aarde.
Varoitus Oikea yhdistettava kytkentajarjestys on maajohto maajohtoon, +RTN varten +RTN, �48 V varten � 48 V. Oikea irrotettava kytkentajarjestys on �48 V varten � 48 V, +RTN varten +RTN, maajohto maajohtoon.
Attention C�blez l'approvisionnement d'alimentation CC En utilisant les crochets appropri�s � l'extr�mit� de c�blage. En reliant la puissance, l'ordre appropri� de c�blage est rectifi� pour rectifier, +RTN � +RTN, puis �48 V � �48 V. En d�branchant la puissance, l'ordre appropri� de c�blage est �48 V � �48 V, +RTN � +RTN, a alors rectifi� pour rectifier. Notez que le fil de masse devrait toujours �tre reli� d'abord et d�branch� pour la derni�re fois. Notez que le fil de masse devrait toujours �tre reli� d'abord et d�branch� pour la derni�re fois.
Warnung Die Stromzufuhr ist nur mit geeigneten Ring�sen an das DC Netzteil anzuschliessen. Die richtige Anschlusssequenz ist: Erdanschluss zu Erdanschluss, +RTN zu +RTN und dann -48V zu -48V. Die richtige Sequenz zum Abtrennen der Stromversorgung ist -48V zu -48V, +RTN zu +RTN und dann Erdanschluss zu Erdanschluss. Es ist zu beachten dass der Erdanschluss immer zuerst angeschlossen und als letztes abgetrennt wird.
Avvertenza Mostra la morsettiera dell alimentatore CC. Cablare l'alimentatore CC usando i connettori adatti all'estremit� del cablaggio, come illustrato. La corretta sequenza di cablaggio � da massa a massa, da positivo a positivo (da linea ad L) e da negativo a negativo (da neutro a N). Tenere presente che il filo di massa deve sempre venire collegato per primo e scollegato per ultimo.
Advarsel Riktig tilkoples tilkoplingssekvens er jord til jord, +RTN til +RTN, �48 V til � 48 V. Riktig frakoples tilkoplingssekvens er �48 V til � 48 V, +RTN til +RTN, jord til jord.
Aviso Ate con alambre la fuente de potencia cc Usando los terminales apropiados en el extremo del cableado. Al conectar potencia, la secuencia apropiada del cableado se muele para moler, +RTN a +RTN, entonces �48 V a �48 V. Al desconectar potencia, la secuencia apropiada del cableado es �48 V a �48 V, +RTN a +RTN, entonces moli�

184
para moler. Observe que el alambre de tierra se debe conectar siempre primero y desconectar por �ltimo. Observe que el alambre de tierra se debe conectar siempre primero y desconectar por �ltimo.
�Atenci�n! Wire a fonte de alimenta��o de DC Usando os tal�es apropriados nan EXtremidade da fia��o. Ao conectar a pot�ncia, a seq��ncia apropriada da fia��o � mo�da para moer, +RTN a +RTN, ent�o �48 V a �48 V. Ao desconectar a pot�ncia, a seq��ncia apropriada da fia��o � �48 V a �48 V, +RTN a +RTN, moeu ent�o para moer. Anote que o fio � terra deve sempre ser conectado primeiramente e desconectado por �ltimo. Anote que o fio � terra deve sempre ser conectado primeiramente e desconectado por �ltimo.
Varning! Korrekt kopplingssekvens ar jord till jord, +RTN till +RTN, �48 V till �48 V. Korrekt kopplas kopplingssekvens ar �48 V till �48 V, +RTN till +RTN, jord till jord.

185
DC Power Wiring Terminations Warning

186
WARNING: When stranded wiring is required, use approved wiring terminations, such as closed-loop or spade-type with upturned lugs. These terminations must be the appropriate size for the wires and must clamp both the insulation and conductor.
Waarschuwing Wanneer geslagen bedrading vereist is, dient u bedrading te gebruiken die voorzien is van goedgekeurde aansluitingspunten, zoals het gesloten-lus type of het grijperschop type waarbij de aansluitpunten omhoog wijzen. Deze aansluitpunten dienen de juiste maat voor de draden te hebben en dienen zowel de isolatie als de geleider vast te klemmen.
Varoitus Jos s�ikeellinen johdin on tarpeen, k�yt� hyv�ksytty� johdinliit�nt��, esimerkiksi suljettua silmukkaa tai kourumaista liit�nt��, jossa on yl�sp�in k��nnetyt kiinnityskorvat. T�llaisten liit�nt�jen tulee olla kooltaan johtimiin sopivia ja niiden tulee puristaa yhteen sek� eristeen ett� johdinosan.
Attention Quand des fils torsad�s sont n�cessaires, utiliser des douilles terminales homologu�es telles que celles � circuit ferm� ou du type � plage ouverte avec cosses rebrouss�es. Ces douilles terminales doivent �tre de la taille qui convient aux fils et doivent �tre referm�es sur la gaine isolante et sur le conducteur.
Warnung Wenn Litzenverdrahtung erforderlich ist, sind zugelassene Verdrahtungsabschl�sse, z.B. f�r einen geschlossenen Regelkreis oder gabelf�rmig, mit nach oben gerichteten Kabelschuhen zu verwenden. Diese Abschl�sse sollten die angemessene Gr��e f�r die Dr�hte haben und sowohl die Isolierung als auch den Leiter festklemmen.
Avvertenza Quando occorre usare trecce, usare connettori omologati, come quelli a occhiello o a forcella con linguette rivolte verso l'alto. I connettori devono avere la misura adatta per il cablaggio e devono serrare sia l'isolante che il conduttore.
Advarsel Hvis det er n�dvendig med flertr�dede ledninger, brukes godkjente ledningsavslutninger, som for eksempel lukket sl�yfe eller spadetype med oppoverb�yde kabelsko. Disse avslutningene skal ha riktig st�rrelse i forhold til ledningene, og skal klemme sammen b�de isolasjonen og lederen.
Aviso Quando forem requeridas montagens de instala��o el�ctrica de cabo torcido, use termina�es de cabo aprovadas, tais como, termina�es de cabo em circuito fechado e planas com terminais de orelha voltados para cima. Estas termina�es de cabo dever�o ser do tamanho apropriado para os respectivos cabos, e dever�o prender simultaneamente o isolamento e o fio condutor.
�Atenci�n! Cuando se necesite hilo trenzado, utilizar terminales para cables homologados, tales como las de tipo "bucle cerrado" o "espada", con las leng�etas de

187
conexi�n vueltas hacia arriba. Estos terminales deber�n ser del tama�o apropiado para los cables que se utilicen, y tendr�n que sujetar tanto el aislante como el conductor.
Varning! N�r flertr�diga ledningar kr�vs m�ste godk�nda ledningskontakter anv�ndas, t.ex. kabelsko av sluten eller �ppen typ med upp�tv�nd tapp. Storleken p� dessa kontakter m�ste vara avpassad till ledningarna och m�ste kunna h�lla b�de isoleringen och ledaren fastkl�mda.

188
Multiple Power Supplies Disconnection Warning
WARNING: The network device has more than one power supply connection. All connections must be removed completely to remove power from the unit completely.
Waarschuwing Deze eenheid heeft meer dan ��n stroomtoevoerverbinding; alle verbindingen moeten volledig worden verwijderd om de stroom van deze eenheid volledig te verwijderen.
Varoitus T�ss� laitteessa on useampia virtal�hdekytkent�j�. Kaikki kytkenn�t on irrotettava kokonaan, jotta virta poistettaisiin t�ysin laitteesta.
Attention Cette unit� est �quip�e de plusieurs raccordements d'alimentation. Pour supprimer tout courant �lectrique de l'unit�, tous les cordons d'alimentation doivent �tre d�branch�s.
Warnung Diese Einheit verf�gt �ber mehr als einen Stromanschlu�; um Strom g�nzlich von der Einheit fernzuhalten, m�ssen alle Stromzufuhren abgetrennt sein.
Avvertenza Questa unit� ha pi� di una connessione per alimentatore elettrico; tutte le connessioni devono essere completamente rimosse per togliere l'elettricit� dall'unit�.
Advarsel Denne enheten har mer enn �n str�mtilkobling. Alle tilkoblinger m� kobles helt fra for � eliminere str�m fra enheten.
Aviso Este dispositivo possui mais do que uma conex�o de fonte de alimenta��o de energia; para poder remover a fonte de alimenta��o de energia, dever�o ser desconectadas todas as conex�es existentes.
�Atenci�n! Esta unidad tiene m�s de una conexi�n de suministros de alimentaci�n; para eliminar la alimentaci�n por completo, deben desconectarse completamente todas las conexiones.
Varning! Denna enhet har mer �n en str�mf�rs�rjningsanslutning; alla anslutningar m�ste vara helt avl�gsnade innan str�mtillf�rseln till enheten �r fullst�ndigt bruten.

189
TN Power Warning
WARNING: The device is designed to work with a TN power system. Waarschuwing Het apparaat is ontworpen om te functioneren met TN energiesystemen. Varoitus Koje on suunniteltu toimimaan TN-s�hk�voimaj�rjestelmien yhteydess�. Attention Ce dispositif a �t� con�u pour fonctionner avec des syst�mes d'alimentation TN. Warnung Das Ger�t ist f�r die Verwendung mit TN-Stromsystemen ausgelegt. Avvertenza Il dispositivo � stato progettato per l'uso con sistemi di alimentazione TN. Advarsel Utstyret er utfomet til bruk med TN-str�msystemer. Aviso O dispositivo foi criado para operar com sistemas de corrente TN. �Atenci�n! El equipo est� dise�ado para trabajar con sistemas de alimentaci�n tipo TN. Varning! Enheten �r konstruerad f�r anv�ndning tillsammans med elkraftssystem av TN-typ.
Action to Take After an Electrical Accident
If an electrical accident results in an injury, take the following actions in this order: 1. Use caution. Be aware of potentially hazardous conditions that could cause further injury. 2. Disconnect power from the device. 3. If possible, send another person to get medical aid. Otherwise, assess the condition of the victim, then
call for help.

190
Agency Approvals for MX204 Router
The router comply with the following standards:
� Safety � CAN/CSA-C22.2 No. 60950-1, Safety of Information Technology Equipment � UL 60950-1 Information Technology Equipment - Safety - Part 1: General Requirements � EN 60950-1 European Norm, Safety of Information Technology Equipment � IEC 60950-1 Information Technology Equipment - Safety - Part 1: General Requirements (with country deviations) � EN 60825-1 Safety of Laser Products - Part 1: Equipment Classification, Requirements and User's Guide
� EMC � EN 300 386 V1.6.1 Telecom Network Equipment - EMC requirements Class A � EN 300 386 V2.1.1 Telecom Network Equipment - EMC requirements Class A � EN 55032:2012 + EN55032:2012/AC:2013 Electromagnetic compatibility of multimedia equipment - Emission requirements Class A � CISPR 32:2012 Electromagnetic compatibility of multimedia equipment � Emission Requirements Class A � EN 55022:2010/AC:2011 European Radiated Emissions Class A � CISPR 22 edition 6.0 : 2008-09 Class A � FCC 47CFR , Part 15 Class A (2012) USA Radiated Emissions Class A � ICES-003 Issue 6, Jan 2016 Canada Radiated Emissions Class A � VCCI-V-3/2013.04 and V-4/2012.04 Japanese Radiated Emissions Class A � VCCI-CISPR 32:2016 Japanese Radiated and Conducted Emissions Class A � BSMI CNS 13438 and NCC C6357 Taiwan Radiated Emissions Class A � AS/NZS CISPR22:2009/A1:2010 Class A � AS/NZS CISPR 32:2015 Electromagnetic compatibility of multimedia equipment - Emission requirements Class A � KN32 Korea Radiated Emission (at 10 Meter) Class A � TEC/EMI/TEL-001/01/FEB-09,Class A

191
� EN-61000-3-2 Power Line Harmonics � EN-61000-3-3 Voltage Fluctuations and Flicker
NOTE: The device has immunity against the electromagnetic interference of 1V/m in the frequency range of 690 Mhz to 960 Mhz and 1400 Mhz to 2690 Mhz.
� Immunity � EN 55024:2010 Information Technology Equipment Immunity Characteristics � CISPR 24:edition 2b: 2010 COREC 2011 IT Equipment Immunity Characteristics � EN 300 386 V1.6.1 Telecom Network Equipment - EMC requirements � EN 300 386 V2.1.1 Telecom Network Equipment - EMC requirements � KN35 Immunity Characteristics � TEC/EMI/TEL-001/01/FEB-09,Class A � EN-61000-4-2 ESD � EN-61000-4-3 Radiated Immunity � EN-61000-4-4 EFT � EN-61000-4-5 Surge � EN-61000-4-6 Low Frequency Common Immunity � EN-61000-4-11 Voltage Dips and Sags
The router is designed to comply with the following standards: � GR-63-Core: NEBS, Physical Protection � GR-1089-Core: EMC and Electrical Safety for Network Telecommunications Equipment � SR-3580 NEBS Criteria Levels (Level 3 Compliance)
RELATED DOCUMENTATION MX204 Router Overview | 18

192
Compliance Statements for NEBS
� The equipment is suitable for installation as part of the Common Bonding Network (CBN). � The equipment is suitable for installation in locations where the National Electrical Code (NEC) applies. � The battery return connection is to be treated as an isolated DC return (that is, DC-I), as defined in
GR-1089-CORE. � You must provision a readily accessible device outside of the equipment to disconnect power. The device
must also be rated based on local electrical code practice.
Compliance Statements for EMC Requirements
IN THIS SECTION Canada | 192 European Community | 192 Israel | 193 Japan | 193 United States | 193
Canada
CAN ICES-3 (A)/NMB-3(A)
European Community
This is a Class A product. In a domestic environment, this product might cause radio interference in which case the user might be required to take adequate measures.

193
Israel
Translation from Hebrew--Warning: This product is Class A. In residential environments, the product might cause radio interference, and in such a situation, the user might be required to take adequate measures.
Japan
The preceding translates as follows: This is a Class A product based on the standard of the Voluntary Control Council for Interference by Information Technology Equipment (VCCI). If this product is used near a radio or television receiver in a domestic environment, it might cause radio interference. Install and use the equipment according to the instruction manual. VCCI-A.
United States
The hardware equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, might cause harmful interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense.

194
Compliance Statements for Environmental Requirements
Batteries in this product are not based on mercury, lead, or cadmium substances. The batteries used in this product are in compliance with EU Directives 91/157/EEC, 93/86/EEC, and 98/101/EEC. The product documentation includes instructional information about the proper method of reclamation and recycling.
Compliance Statements for Acoustic Noise for MX204 Router
The router complies with NEBS Level 3 requirements: � GR-63-CORE: NEBS, Physical Protection � GR-1089-CORE: EMC and Electrical Safety for Network Telecommunications Equipment
Statements of Volatility for Juniper Network Devices
A statement of volatility (SoV)--sometimes known as letter of volatility (LoV)--identifies the volatile and non-volatile storage components in Juniper Networks devices, and describes how to remove non-volatile storage components from the device.
NOTE: Individual FRUs do not have separate SoV or LoV documents. They are covered in the SoV or LoV of the Juniper Networks device in which they are installed.
NOTE: Statements of volatility are not available for all Juniper Networks devices.
CTP Series: � CTP150 � CTP2000

195
EX Series:
� EX2200 and EX2200-C � EX2300-24P, EX2300-24T, and EX2300-24T-DC � EX2300-48P and EX2300-48T � EX2300-C � EX3300 � EX3400-24P, EX3400-24T, EX3400-24T-DC � EX3400-48P, EX3400-48T, EX3400-48T-AFI � EX4200 � EX4300 � EX4300-48MP � EX4500 � EX4550 � EX4600 � EX8200 � XRE200 External Routing Engine LN Series:
� LN1000�CC MX Series:
� M7i � M7i Compact Forwarding Engine Board (CFEB) � M40e and M10i � M320 � MX5, MX10, MX40, and MX80 � MX104 � MX204 � MX240, MX480, and MX960 � MX10003 � RE-A-2000 Route Engine � RE-S-X6-64G Routing Engine

196
QFX Series:
� QFX3008-I � QFX3100 � QFX3500 � QFX3600 � QFX5100-24Q � QFX5100-48S � QFX5100-48T � QFX5110-32Q � QFX5110-48S � QFX5200 � QFX5200-32C � QFX10008 and QFX10016 SRX Series:
� SRX100 � SRX110 � SRX210B � SRX210H-POE � SRX210H-P-MGW � SRX220 � SRX240H � SRX240H-POE � SRX300 � SRX320 � SRX340 and SRX345 � SRX550 � SRX650 � SRX1400 � SRX1500 � SRX3400 and SRX3600

197
� SRX5400, SRX5600, and SRX5800 � SRX-MP-1SERIAL � SSG-520M T Series: � RE-A-2000 Route Engine