Milan Technology Mil Sm4804G Users Manual Install

MIL-SM4804G to the manual 09b858a5-2db7-47e1-b3c8-fc235c5e2e3f

2015-02-09

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48 10/100 Ports
+ 2 Combo SFP Gigabit Ports
+ 2 10/100/1000 Gigabit Ports
Multi-Layer Stackable Management Switch

MIL-SM4804G
Quick Installation Guide

Quick Installation Guide

48 10/100 Ports + 2Combo SFP + 2 Gigabit Copper
Multi-Layer Stackable Management Switch
Layer 2 Stackable Switch with
50 100BASE-TX (RJ-45) Ports,
and 2 Gigabit Combination Ports (RJ-45/SFP)

MIL-SM4804G
90000444 REV A

Regulatory Approval
•
•
•
•
•
•
•

FCC Class A
UL 60950
CSA C22.2 No. 60950
EN60950
CE
EN55022 Class A
EN55024

Canadian EMI Notice
This Class A digital apparatus meets all the requirements of the Canadian Interference-Causing Equipment Regulations
Cet appareil numerique de la classe A respecte toutes les exigences du Reglement sur le materiel brouilleur du Canada.

European Notice
Products with the CE Marking comply with both the EMC Directive (89/336/EEC)
and the Low Voltage Directive (73/23/EEC) issued by the Commission of the European Community Compliance with these directives imply conformity to the following European Norms:
•
EN55022 (CISPR 22) - Radio Frequency Interference
•
EN61000-X - Electromagnetic Immunity
•
EN60950 (IEC950) - Product Safety
Five-Year Limited Warranty
MiLAN Technology warrants to the original consumer or purchaser that each of
it's products, and all components thereof, will be free from defects in material
and/or workmanship for a period of five years from the original factory shipment
date. Any warranty hereunder is extended to the original consumer or purchaser
and is not assignable.
MiLAN Technology makes no express or implied warranties including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose,
except as expressly set forth in this warranty. In no event shall MiLAN Technology
be liable for incidental or consequential damages, costs, or expenses arising out
of or in connection with the performance of the product delivered hereunder.
MiLAN Technology will in no case cover damages arising out of the product being
used in a negligent fashion or manner.

Trademarks
The MiLAN logo and MiLAN Technology trademarks are registered trademarks of
MiLAN Technology in the
United States and/or other countries.

To Contact MiLAN Technology
For prompt response when calling for service information, have the following information ready:
- Product serial number and revision
- Date of purchase
- Vendor or place of purchase

You can reach MiLAN Technology technical support at:
E-mail: support@milan.com
Telephone: +1.408.744.2751
Fax: +1.408.744.2771
MiLAN Technology
1329 Moffett Park Drive
Sunnyvale, CA 94089
United States of America
Telephone: +1.408.744.2775
Fax: +1.408.744.2793
http://www.milan.com
info@milan.com
© Copyright 2005 MiLAN Technology P/N: 90000433 Rev. A

Compliances and Safety Warnings
CE Mark Declaration of Conformance for EMI and Safety (EEC)
This information technology equipment complies with the requirements of the Council
Directive 89/336/EEC on the Approximation of the laws of the Member States relating to
Electromagnetic Compatibility and 73/23/EEC for electrical equipment used within certain
voltage limits and the Amendment Directive 93/68/EEC. For the evaluation of the
compliance with these Directives, the following standards were applied:
RFI Emission: • Limit class A according to EN 55022:1998
• Limit class A for harmonic current emission according to EN 61000-3-2/1995
• Limitation of voltage fluctuation and flicker in low-voltage supply system
according to EN 61000-3-3/1995
Immunity:

• Product family standard according to EN 55024:1998
• Electrostatic Discharge according to EN 61000-4-2:1995
(Contact Discharge: ±4 kV, Air Discharge: ±8 kV)
• Radio-frequency electromagnetic field according to EN 61000-4-3:1996
(80 - 1000 MHz with 1 kHz AM 80% Modulation: 3 V/m)
• Electrical fast transient/burst according to EN 61000-4-4:1995 (AC/DC power
supply: ±1 kV, Data/Signal lines: ±0.5 kV)
• Surge immunity test according to EN 61000-4-5:1995
(AC/DC Line to Line: ±1 kV, AC/DC Line to Earth: ±2 kV)
• Immunity to conducted disturbances, Induced by radio-frequency fields:
EN 61000-4-6:1996 (0.15 - 80 MHz with 1 kHz AM 80% Modulation: 3 V/m)
• Power frequency magnetic field immunity test according to
EN 61000-4-8:1993
(1 A/m at frequency 50 Hz)
• Voltage dips, short interruptions and voltage variations immunity test
according to EN 61000-4-11:1994 (>95% Reduction @10 ms, 30%
Reduction @500 ms, >95% Reduction @5000 ms)

LVD:

• EN 60950-1:2001

Caution: Do not plug a phone jack connector in the RJ-45 port. This may damage this
device.
Attention: Les raccordeurs ne sont pas utilisés pour le système téléphonique!

iii

Safety Compliance
Warning: Fiber Optic Port Safety
CLASS I
LASER DEVICE

When using a fiber optic port, never look at the transmit laser while it is
powered on. Also, never look directly at the fiber TX port and fiber cable
ends when they are powered on.

Avertissment: Ports pour fibres optiques - sécurité sur le plan optique
DISPOSITIF LASER
DE CLASSE I

Ne regardez jamais le laser tant qu'il est sous tension. Ne regardez
jamais directement le port TX (Transmission) à fibres optiques et les
embouts de câbles à fibres optiques tant qu'ils sont sous tension.

Warnhinweis: Faseroptikanschlüsse - Optische Sicherheit
LASERGERÄT
DER KLASSE I

Niemals ein Übertragungslaser betrachten, während dieses
eingeschaltet ist. Niemals direkt auf den Faser-TX-Anschluß
und auf die Faserkabelenden schauen, während diese
eingeschaltet sind.

Please read the following safety information carefully before
installing the switch:
WARNING: Installation and removal of the unit must be carried out by qualified personnel
only.
• The unit must be connected to an earthed (grounded) outlet to comply with international
safety standards.
• Do not connect the unit to an A.C. outlet (power supply) without an earth (ground)
connection.
• The appliance coupler (the connector to the unit and not the wall plug) must have a
configuration for mating with an EN 60320/IEC 320 appliance inlet.
• The socket outlet must be near to the unit and easily accessible. You can only remove
power from the unit by disconnecting the power cord from the outlet.
• This unit operates under SELV (Safety Extra Low Voltage) conditions according to
IEC 60950. The conditions are only maintained if the equipment to which it is connected
also operates under SELV conditions.
France and Peru only
This unit cannot be powered from IT† supplies. If your supplies are of IT type, this unit
must be powered by 230 V (2P+T) via an isolation transformer ratio 1:1, with the
secondary connection point labelled Neutral, connected directly to earth (ground).
†
•

Impédance à la terre

Power Cord Set
U.S.A. and Canada

The cord set must be UL-approved and CSA certified.
The minimum specifications for the flexible cord are:
- No. 18 AWG - not longer than 2 meters, or 16 AWG.
- Type SV or SJ
- 3-conductor
The cord set must have a rated current capacity of at least 10 A
The attachment plug must be an earth-grounding type with NEMA
5-15P (15 A, 125 V) or NEMA 6-15P (15 A, 250 V) configuration.

Denmark

The supply plug must comply with Section 107-2-D1, Standard
DK2-1a or DK2-5a.

Switzerland

The supply plug must comply with SEV/ASE 1011.

U.K.

The supply plug must comply with BS1363 (3-pin 13 A) and be fitted
with a 5 A fuse which complies with BS1362.
The mains cord must be or marked and be of type
HO3VVF3GO.75 (minimum).

Europe

The supply plug must comply with CEE7/7 (“SCHUKO”).
The mains cord must be or marked and be of type
HO3VVF3GO.75 (minimum).
IEC-320 receptacle.

Veuillez lire à fond l'information de la sécurité suivante avant
d'installer le Switch:
AVERTISSEMENT: L’installation et la dépose de ce groupe doivent être confiés à un
personnel qualifié.
• Ne branchez pas votre appareil sur une prise secteur (alimentation électrique) lorsqu'il
n'y a pas de connexion de mise à la terre (mise à la masse).
• Vous devez raccorder ce groupe à une sortie mise à la terre (mise à la masse) afin de
respecter les normes internationales de sécurité.
• Le coupleur d’appareil (le connecteur du groupe et non pas la prise murale) doit
respecter une configuration qui permet un branchement sur une entrée d’appareil EN
60320/IEC 320.
• La prise secteur doit se trouver à proximité de l’appareil et son accès doit être facile.
Vous ne pouvez mettre l’appareil hors circuit qu’en débranchant son cordon électrique
au niveau de cette prise.
• L’appareil fonctionne à une tension extrêmement basse de sécurité qui est conforme à
la norme IEC 60950. Ces conditions ne sont maintenues que si l’équipement auquel il
est raccordé fonctionne dans les mêmes conditions.

France et Pérou uniquement:
Ce groupe ne peut pas être alimenté par un dispositif à impédance à la terre. Si vos
alimentations sont du type impédance à la terre, ce groupe doit être alimenté par une
tension de 230 V (2 P+T) par le biais d’un transformateur d’isolement à rapport 1:1, avec
un point secondaire de connexion portant l’appellation Neutre et avec raccordement
direct à la terre (masse).
Cordon électrique - Il doit être agréé dans le pays d’utilisation
Etats-Unis et
Canada:

Le cordon doit avoir reçu l’homologation des UL et un certificat de la
CSA.
Les spe'cifications minimales pour un cable flexible sont AWG No.
18, ouAWG No. 16 pour un cable de longueur infe'rieure a` 2 me'tres.
- type SV ou SJ
- 3 conducteurs
Le cordon doit être en mesure d’acheminer un courant nominal d’au
moins 10 A.
La prise femelle de branchement doit être du type à mise à la terre
(mise à la masse) et respecter la configuration NEMA 5-15P (15 A,
125 V) ou NEMA 6-15P (15 A, 250 V).

Danemark:

La prise mâle d’alimentation doit respecter la section 107-2 D1 de la
norme DK2 1a ou DK2 5a.

Suisse:

La prise mâle d’alimentation doit respecter la norme SEV/ASE 1011.

Europe

La prise secteur doit être conforme aux normes CEE 7/7 (“SCHUKO”)
LE cordon secteur doit porter la mention ou et doit
être de type HO3VVF3GO.75 (minimum).

Bitte unbedingt vor dem Einbauen des Switches die folgenden
Sicherheitsanweisungen durchlesen:
WARNUNG: Die Installation und der Ausbau des Geräts darf nur durch Fachpersonal
erfolgen.
• Das Gerät sollte nicht an eine ungeerdete Wechselstromsteckdose angeschlossen
werden.
• Das Gerät muß an eine geerdete Steckdose angeschlossen werden, welche die
internationalen Sicherheitsnormen erfüllt.
• Der Gerätestecker (der Anschluß an das Gerät, nicht der Wandsteckdosenstecker) muß
einen gemäß EN 60320/IEC 320 konfigurierten Geräteeingang haben.
• Die Netzsteckdose muß in der Nähe des Geräts und leicht zugänglich sein. Die
Stromversorgung des Geräts kann nur durch Herausziehen des Gerätenetzkabels aus
der Netzsteckdose unterbrochen werden.
• Der Betrieb dieses Geräts erfolgt unter den SELV-Bedingungen
(Sicherheitskleinstspannung) gemäß IEC 60950. Diese Bedingungen sind nur
gegeben, wenn auch die an das Gerät angeschlossenen Geräte unter
SELV-Bedingungen betrieben werden.

Stromkabel. Dies muss von dem Land, in dem es benutzt wird geprüft werden:
Schweiz

Dieser Stromstecker muß die SEV/ASE 1011Bestimmungen einhalten.

Europe

Das Netzkabel muß vom Typ HO3VVF3GO.75 (Mindestanforderung)
sein und die Aufschrift oder tragen.
Der Netzstecker muß die Norm CEE 7/7 erfüllen (”SCHUKO”).

Warnings and Cautionary Messages
Warning:

This product does not contain any serviceable user parts.

Warning:

Installation and removal of the unit must be carried out by qualified
personnel only.

Warning:

When connecting this device to a power outlet, connect the field ground lead
on the tri-pole power plug to a valid earth ground line to prevent electrical
hazards.

Warning:

This switch uses lasers to transmit signals over fiber optic cable. The lasers
are compliant with the requirements of a Class 1 Laser Product and are
inherently eye safe in normal operation. However, you should never look
directly at a transmit port when it is powered on.

Caution:

Wear an anti-static wrist strap or take other suitable measures to prevent
electrostatic discharge when handling this equipment.

Caution:

Do not plug a phone jack connector in the RJ-45 port. This may damage this
device. Les raccordeurs ne sont pas utilisé pour le système téléphonique!

Caution:

Use only twisted-pair cables with RJ-45 connectors that conform to FCC
standards.

Warnings (in German)
Achtung:

Dieses Produkt enthält keine Teile, die eine Wartung vom Benutzer
benötigen.

Achtung:

Installation und Deinstallation des Gerätes müssen von qualifiziertem
Servicepersonal durchgeführt werden.

Achtung:

Wenn das Gerät an eine Steckdose angeschlossen wird, muß der
Masseanschluß am dreipoligen Netzstecker mit Schutzerde verbunden
werden, um elektrische Gefahren zu vermeiden.

Achtung:

Dieses Gerät nutzt Laser zur Signalübertragung über Glasfasern. Die Laser
entsprechen den Anforderungen an eine Lasereinrichtung der Klasse 1 und
sind durch ihre Bauart im normalen Betrieb sicher für die Augen. Trotzdem
sollte niemals direkt in den einen Übertragungskanal geblickt werden, wenn
er eingeschaltet ist.

vii

Environmental Statement
The manufacturer of this product endeavours to sustain an environmentally-friendly policy
throughout the entire production process. This is achieved though the following means:
• Adherence to national legislation and regulations on environmental production
standards.
• Conservation of operational resources.
• Waste reduction and safe disposal of all harmful un-recyclable by-products.
• Recycling of all reusable waste content.
• Design of products to maximize recyclables at the end of the product’s life span.
• Continual monitoring of safety standards.

End of Product Life Span
This product is manufactured in such a way as to allow for the recovery and disposal of all
included electrical components once the product has reached the end of its life.

Manufacturing Materials
There are no hazardous nor ozone-depleting materials in this product.

Documentation
All printed documentation for this product uses biodegradable paper that originates from
sustained and managed forests. The inks used in the printing process are non-toxic.

Purpose
This guide details the hardware features of the switch, including Its physical and
performance-related characteristics, and how to install the switch.

Audience
This guide is for system administrators with a working knowledge of network
management. You should be familiar with switching and networking concepts.
Zielgruppe Dieser Anleitung ist fuer Systemadministratoren mit Erfahrung im
Netzwerkmangement. Sie sollten mit Switch- und Netzwerkkonzepten vertraut sein.

Related Publications
The following publication gives specific information on how to operate and use the
management functions of the switch:
The Stackable Fast Ethernet Switch Management Guide
Also, as part of the switch’s firmware, there is an online web-based help that describes all
management related features.

viii

Contents
Chapter 1: Introduction
Overview
Switch Architecture
Network Management Options
Description of Hardware
10BASE-T/100BASE-TX Ports
1000BASE-T/SFP Ports
Stacking Ports
Port and System Status LEDs
Power Supply Receptacles
Features and Benefits
Connectivity
Expandability
Performance
Management
Chapter 2: Network Planning
Introduction to Switching
Application Examples
Collapsed Backbone
Network Aggregation Plan
Remote Connections with Fiber Cable
Making VLAN Connections
Application Notes
Chapter 3: Installing the Switch
Selecting a Site
Ethernet Cabling
Equipment Checklist
Package Contents
Optional Rack-Mounting Equipment
Mounting
Rack Mounting
Desktop or Shelf Mounting
Installing an Optional SFP Transceiver
Connecting Switches in a Stack
Connecting to a Power Source
Connecting to the Console Port
Wiring Map for Serial Cable

1-1
1-1
1-2
1-2
1-2
1-2
1-3
1-4
1-5
1-7
1-7
1-7
1-7
1-8
1-8
2-1
2-1
2-2
2-2
2-3
2-4
2-5
2-6
3-1
3-1
3-1
3-2
3-2
3-2
3-3
3-3
3-5
3-6
3-6
3-8
3-9
3-9
ix

Contents

Chapter 4: Making Network Connections
Connecting Network Devices
Twisted-Pair Devices
Cabling Guidelines
Connecting to PCs, Servers, Hubs and Switches
Network Wiring Connections
Fiber Optic SFP Devices
Connectivity Rules
1000BASE-T Cable Requirements
1000 Mbps Gigabit Ethernet Collision Domain
100 Mbps Fast Ethernet Collision Domain
10 Mbps Ethernet Collision Domain
Cable Labeling and Connection Records

4-1
4-1
4-1
4-1
4-2
4-2
4-4
4-5
4-5
4-6
4-6
4-6
4-7

Appendix A: Troubleshooting A-1
Diagnosing Switch Indicators
Diagnosing Power Problems with the LEDs
Power and Cooling Problems
Installation
In-Band Access
Stack Troubleshooting

A-1
A-1
A-2
A-2
A-2
A-2

Appendix B: Cables B-1
Twisted-Pair Cable and Pin Assignments
10BASE-T/100BASE-TX Pin Assignments
Straight-Through Wiring
Crossover Wiring
1000BASE-T Pin Assignments
Fiber Standards

B-1
B-1
B-2
B-2
B-3
B-4

Appendix C: Specifications C-1
Switch Features
Management Features
Standards
Compliances
Glossary
Index

C-2
C-2
C-3
C-3

Tables
Table 1-1
Table 1-2
Table 3-1
Table 4-1
Table 4-2
Table 4-3
Table 4-4
Table 4-5
Table 4-6
Table A-1
Table A-2
Table B-1
Table B-2

Port Status LEDs
System Status LEDs
Serial Cable Wiring
Maximum 1000BASE-T Gigabit Ethernet Cable Length
Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths
Maximum 1000BASE-LX Gigabit Ethernet Cable Length
Maximum 1000BASE-LH Gigabit Ethernet Cable Length
Maximum Fast Ethernet Cable Length
Maximum Ethernet Cable Length
Troubleshooting Chart
Power/RPS LEDs
10/100BASE-TX MDI and MDI-X Port Pinouts
1000BASE-T MDI and MDI-X Port Pinouts

1-5
1-6
3-9
4-6
4-6
4-6
4-6
4-6
4-6
A-1
A-1
B-2
B-3

Figures
Figure 1-1
Figure 1-2
Figure 1-3
Figure 1-4
Figure 1-5
Figure 2-1
Figure 2-2
Figure 2-3
Figure 2-4
Figure 3-1
Figure 3-2
Figure 3-3
Figure 3-4
Figure 3-5
Figure 3-6
Figure 3-7
Figure 3-8
Figure 4-1
Figure 4-2
Figure 4-3
Figure B-1
Figure B-2
Figure B-3

xii

Front and Rear Panels
Stacking Ports
Port LEDs
System LEDs
Power Supply Receptacles
Collapsed Backbone
Network Aggregation Plan
Remote Connections with Fiber Cable
Making VLAN Connections
RJ-45 Connections
Attaching the Brackets
Installing the Switch in a Rack
Attaching the Adhesive Feet
Installing an SFP Transceiver into a slot
Connecting Switches in a Ring-topology Stack
Power Receptacles
Serial Port (DB-9 DTE) Pin-Out
Making Twisted-Pair Connections
Network Wiring Connections
Making Fiber Port Connections
RJ-45 Connector Pin Numbers
Straight-through Wiring
Crossover Wiring

1-1
1-4
1-5
1-6
1-7
2-2
2-3
2-4
2-5
3-2
3-3
3-4
3-5
3-6
3-7
3-8
3-9
4-2
4-3
4-5
B-1
B-2
B-3

Chapter 1: Introduction
Overview
The MIL-SM4804G switch is a stackable Fast Ethernet switch with 48 10BASE-T/
100BASE-TX ports, and two 1000BASE-T ports1 that operate in combination with
two Small Form Factor Pluggable (SFP) transceiver slots. These switches also
provide two 1 Gbps built-in stacking ports for connecting up to four MIL-SM4804G
units in a stack. The stacking ports can also be used as normal Ethernet ports in
standalone mode. The switch also includes an SNMP-based management agent,
which provides both in-band and out-of-band access for managing the switch.
The MIL-SM4804G provides a broad range of powerful features for Layer 2
switching, delivering reliability and consistent performance for your network traffic.
They bring order to poorly performing networks by segregating them into separate
broadcast domains with IEEE 802.3Q compliant VLANs, and empowers multimedia
applications with multicast switching and CoS services.
Port Status Indicators

System Indicators

Stacking Ports

10/100 Mbps RJ-45 Ports

1000BASE-T/SFP Ports

RPS

Console
DC
12V 4.5A

Console Port

Redundant Power Socket

Power Socket

Figure 1-1 Front and Rear Panels

1. If an SFP transceiver is plugged in, the corresponding RJ-45 port (25-26 or 49-50) is disabled.

1-1

Introduction

Switch Architecture
The MIL-SM4804G employs a wire-speed, non-blocking switching fabric2. This
permits simultaneous wire-speed transport of multiple packets at low latency on all
ports. The switches also features full-duplex capability on all ports, which effectively
doubles the bandwidth of each connection.
The switches uses store-and-forward switching to ensure maximum data integrity.
With store-and-forward switching, the entire packet must be received into a buffer
and checked for validity before being forwarded. This prevents errors from being
propagated throughout the network.
The switches include built-in stacking ports that allow multiple units to connected
together through a 4 Gbps stack backplane. The switch stack can be managed from
a master unit using a single IP address.

Network Management Options
With a comprehensive array of LEDs, the MIL-SM4804G switch provides “at a
glance” monitoring of network and port status. The switches can be managed over
the network with a web browser or Telnet application, or via a direct connection to
the console port. The switches includes a built-in network management agent that
allows them to be managed in-band using SNMP or RMON (Groups 1, 2, 3, 9)
protocols. They also have an RS-232 serial port (DB-9 connector) on the front panel
for out-of-band management. A PC may be connected to this port for configuration
and monitoring out-of-band via a null-modem serial cable. (See Appendix B for wiring
options.)
For a detailed description of the advanced features, refer to the Management Guide.

Description of Hardware
10BASE-T/100BASE-TX Ports
The MIL-SM4804G switch contains 48 10BASE-T/100BASE-TX RJ-45 ports. All
ports support automatic MDI/MDI-X operation, so you can use straight-through
cables for all network connections to PCs or servers, or to other switches or hubs.
(See “10BASE-T/100BASE-TX Pin Assignments” on page B-1.)
Each of these ports support auto-negotiation, so the optimum transmission mode
(half or full duplex), and data rate (10 or 100 Mbps) can be selected automatically. If
a device connected to one of these ports does not support auto-negotiation, the
communication mode of that port can be configured manually.
2. Non-blocking switching is used for traffic crossing ports attached to the same switch ASIC;
while blocking is employed for traffic passing between different switch chips. The
MIL-SM4804G has two switch chips – ASIC#1: Ports 1-12, 25-36, 49, 51 and ASIC#2: Ports
13-24, 37-48, 50, 52.

1-2

Description of Hardware

Each port also supports IEEE 802.3x auto-negotiation of flow control3, so the switch
can automatically prevent port buffers from becoming saturated.

1000BASE-T/SFP Ports
These are combination Gigabit RJ-45 ports with shared Small Form Factor
Pluggable (SFP) transceiver slots (See Figure 1-1, Ports 25-26/49-50). If an SFP
transceiver (purchased separately) is installed in a slot and has a valid link on the
port, the associated RJ-45 port is disabled.
The 1000BASE-T RJ-45 ports support automatic MDI/MDI-X operation, so you can
use straight-through cables for all network connections to PCs or servers, or to other
switches or hubs. (See “1000BASE-T Pin Assignments” on page B-3.)

3. Flow control is only supported for ports attached to the same switch ASIC. The MIL-SM4804G
has two switch chips– ASIC#1: Ports 1-12, 25-36, 49, 51 and ASIC#2: Ports 13-24, 37-48, 50,
52.

1-3

Introduction

Stacking Ports
The unit provides two stacking ports that provide a 4 Gbps stack backplane
connection. You can stack up to four MIL-SM4804G units using Category 5 Ethernet
cables (purchased separately). The Master button enables one switch in the stack to
be selected as the master. This is the unit through which you manage the entire
stack.
The stacking ports can also be used as normal Ethernet ports in standalone mode
by pressing the Uplink button.
Master Button

Uplink Button

Stacking Ports
Figure 1-2 Stacking Ports

1-4

Description of Hardware

Port and System Status LEDs
The MIL-SM4804G includes a display panel for key system and port indications that
simplify installation and network troubleshooting. The LEDs, which are located on
the front panel for easy viewing, are shown below and described in the following
tables.
Port Status LEDs
1

Figure 1-3 Port LEDs

Table 1-1 Port Status LEDs
LED

Condition

Status

Fast Ethernet Ports
MIL-SM4804G: Ports 1-48
(Link/Activity)

On/Flashing
Amber

Port has established a valid 10 Mbps network connection.
Flashing indicates activity.

On/Flashing
Green

Port has established a valid 100 Mbps network connection.
Flashing indicates activity.

Off

There is no valid link on the port.

Flashing Green

When the “light unit” command is entered in the Command Line
Interface, the LED corresponding to the switch’s ID will flash for
about 15 seconds.

Gigabit Ethernet Ports
MIL-SM4804G: Ports 49-50, and Ports 51-52 when stacking is not implemented
(Link/Activity)

On/Flashing
Amber

Port has established a valid 10/100 Mbps network connection.
Flashing indicates activity.

On/Flashing
Green

Port has established a valid 1000 Mbps network connection.
Flashing indicates activity.

Off

There is no valid link on the port.

1-5

Introduction

System LEDs

Figure 1-4 System LEDs

Table 1-2 System Status LEDs
LED

Condition

PWR

On Green

The unit’s internal power supply is operating normally.

On Amber

The unit’s internal power supply has failed.

Diag

RPS

Stack Master

1-6

Status

Off

The unit has no power connected.

On Green

The system diagnostic test has completed successfully.

Flashing Green

The system diagnostic test is in progress.

On Amber

The system diagnostic test has detected a fault.

Green

A redundant power supply is attached and is active.

Amber

A redundant power supply is attached but not active.

Off

There is no redundant power supply currently attached.

Flashing Amber

An initial power-on state during which the stack
configuration is detected.

Green

This switch is acting as the Master unit in the stack.

Amber

This switch is acting as a Slave unit in the stack.

Off

Switch is operating in standalone mode.

Features and Benefits

Power Supply Receptacles
There are two power receptacles on the rear panel of the switch. The standard
power receptacle is for the AC power cord. The receptacle labeled “RPS” is for the
optional Redundant Power Supply (RPS).

RPS

DC
12V 4.5A
100-240V~ 50-60Hz 2A

Figure 1-5 Power Supply Receptacles

Features and Benefits
Connectivity
• 48 (MIL-SM4804G) 100BASE-TX ports, 2 1000BASE-T ports, and 2 combination
1000BASE-T/SFP ports for easy integration and for protection of your investment
in legacy LAN equipment.
• Auto-negotiation enables each RJ-45 port to automatically select the optimum
speed (10, 100 or 1000 Mbps), and the communication mode (half or full duplex)
if this feature is supported by the attached device; otherwise the port can be
configured manually.
• 100BASE-TX and 1000BASE-T RJ-45 ports support auto MDI/MDI-X pinout
configuration.
• Unshielded (UTP) cable supported on all RJ-45 ports: Category 3 or better for
10 Mbps connections, Category 5 or better for 100 Mbps connections, and
Category 5, 5e or 6 for 1000 Mbps connections.
• IEEE 802.3-2002 Ethernet, Fast Ethernet, Gigabit Ethernet compliance ensures
compatibility with standards-based hubs, network cards and switches from any
vendor.
• Provides stacking capability via RJ-45 ports with 4 Gbps stacking bandwidth. You
can connect up to four MIL-SM4804G units in a stack.

Expandability
• 2 Small Form Factor Pluggable (SFP) transceiver slots (shared with 1000BASE-T
ports)
• Supports 1000BASE-SX, 1000BASE-LX, and 1000BASE-LH SFP transceivers.

1-7

Introduction

Performance
• Transparent bridging
• Aggregate duplex bandwidth of 17.6 Gbps (MIL-SM4804G)
• Switching table with a total of 8K MAC address entries
• Provides store-and-forward switching
• Wire-speed filtering and forwarding
• Supports flow control, using back pressure for half duplex and IEEE 802.3x for full
duplex
• Broadcast storm control

Management
• “At-a-glance” LEDs for easy troubleshooting
• Network management agent:
- Manages switch in-band or out-of-band
- Supports SSH, Telnet, SNMP, RMON (4 groups) and web-based interface

1-8

Chapter 2: Network Planning
Introduction to Switching
A network switch allows simultaneous transmission of multiple packets via
non-crossbar switching. This means that it can partition a network more efficiently
than bridges or routers. The switch has, therefore, been recognized as one of the
most important building blocks for today’s networking technology.
When performance bottlenecks are caused by congestion at the network access
point (such as the network card for a high-volume file server), the device
experiencing congestion (server, power user, or hub) can be attached directly to a
switched port. And, by using full-duplex mode, the bandwidth of the dedicated
segment can be doubled to maximize throughput.
When networks are based on repeater (hub) technology, the distance between end
stations is limited by a maximum hop count. However, a switch turns the hop count
back to zero. So subdividing the network into smaller and more manageable
segments, and linking them to the larger network by means of a switch, removes this
limitation.
A switch can be easily configured in any Ethernet, Fast Ethernet, or Gigabit Ethernet
network to significantly boost bandwidth while using conventional cabling and
network cards.

2-1

Network Planning

Application Examples
The MIL-SM4804G switch is not only designed to segment your network, but also to
provide a wide range of options in setting up network connections. Some typical
applications are described below.

Collapsed Backbone
The MIL-SM4804G is an excellent choice for mixed Ethernet, Fast Ethernet, and
Gigabit Ethernet installations where significant growth is expected in the near future.
You can easily build on this basic configuration, adding direct full-duplex
connections to workstations or servers. When the time comes for further expansion,
just connect to another hub or switch using one of the Fast Ethernet or Gigabit
Ethernet ports.
In the figure below, the switch is operating as a collapsed backbone for a small LAN.
It is providing dedicated 10 Mbps full-duplex connections to workstations, 100 Mbps
full-duplex connections to power users, and 1 Gbps full-duplex connections to
servers.

...
Servers
1 Gbps
Full Duplex

...
Workstations
100 Mbps
Full Duplex

Figure 2-1 Collapsed Backbone

2-2

...
Workstations
10 Mbps
Full Duplex

Application Examples

Network Aggregation Plan
When used in standalone mode, the MIL-SM4804G provides 52 parallel bridging
ports (i.e., 52 distinct collision domains), which can be used to collapse a complex
network down into a single efficient bridged node, increasing overall bandwidth and
throughput.
You can stack up to four MIL-SM4804G switch units together, forming a single
“virtual” switch containing up to 200 ports. The whole stack can be managed through
the Master unit using a single IP address.
In the figure below, the 10BASE-T/100BASE-TX ports on the MIL-SM4804G switch
are providing 100 Mbps connectivity for up to 24 segments. In addition, the switch is
also connecting several servers at 1000 Mbps.

Stacked Units

1000 Mbps
Segments
10/100 Mbps
Segments

...

...
Server Farm

Figure 2-2 Network Aggregation Plan

2-3

Network Planning

Remote Connections with Fiber Cable
Fiber optic technology allows for longer cabling than any other media type. A
1000BASE-SX (MMF) link can connect to a site up to 550 meters away, a
1000BASE-LX (SMF) link up to 5 km, and a 1000BASE-LH link up to 70 km. This
allows a Gigabit Ethernet Switch to serve as a collapsed backbone, providing direct
connectivity for a widespread LAN.
The figure below illustrates this switch connecting multiple segments with fiber
cable.
Headquarters

1000BASE-LH SMF
(70 kilometers)

Server Farm

1000BASE-LX SMF
(5 kilometers)

Remote Switch

10/100 Mbps Segments

...

...
Figure 2-3 Remote Connections with Fiber Cable

2-4

Application Examples

Making VLAN Connections
This switch supports VLANs which can be used to organize any group of network
nodes into separate broadcast domains. VLANs confine broadcast traffic to the
originating group, and can eliminate broadcast storms in large networks. This
provides a more secure and cleaner network environment.
VLANs can be based on untagged port groups, or traffic can be explicitly tagged to
identify the VLAN group to which it belongs. Untagged VLANs can be used for small
networks attached to a single switch. However, tagged VLANs should be used for
larger networks, and all the VLANs assigned to the inter-switch links.

R&D
Tagged Port

VLAN 1
Untagged Ports

Tagged
Ports
Finance

VLAN
aware
switch

VLAN
unaware
switch

R&D

Marketing

Testing

Finance

VLAN 2
Testing

VLAN 1
VLAN 2

VLAN 3
VLAN 4
VLAN 3

Figure 2-4 Making VLAN Connections
Note: When connecting to a switch that does not support IEEE 802.1Q VLAN tags, use
untagged ports.

2-5

Network Planning

Application Notes
1.

Full-duplex operation only applies to point-to-point access (such as when a
switch is attached to a workstation, server or another switch). When the switch
is connected to a hub, both devices must operate in half-duplex mode.

Avoid using flow control on a port connected to a hub unless it is actually
required to solve a problem. Otherwise back pressure jamming signals may
degrade overall performance for the segment attached to the hub.

As a general rule the length of fiber optic cable for a single switched link should
not exceed:
• 1000BASE-SX: 550 m (1805 ft) for multimode fiber.
• 1000BASE-LX: 5 km (3.1 miles) for singlemode fiber.
• 1000BASE-LH: 70 km (43.5 miles) for singlemode fiber.
However, power budget constraints must also be considered when calculating
the maximum cable length for your specific environment.

The maximum number of units that can be stacked together are:
• 4 MIL-SM4804G units

2-6

Chapter 3: Installing the Switch
Selecting a Site
Switch units can be mounted in a standard 19-inch equipment rack or on a flat
surface. Be sure to follow the guidelines below when choosing a location.
• The site should:
- be at the center of all the devices you want to link and near a power outlet.
- be able to maintain its temperature within
0 to 50 °C (32 to 122 °F) for the MIL-SM4804G, and
its humidity within 5% to 95%, non-condensing
- provide adequate space (approximately two inches) on all sides for proper air
flow
- be accessible for installing, cabling and maintaining the devices
- allow the status LEDs to be clearly visible
• Make sure twisted-pair cable is always routed away from power lines, fluorescent
lighting fixtures and other sources of electrical interference, such as radios and
transmitters.
• Make sure that the unit is connected to a separate grounded power outlet that
provides 100 to 240 VAC, 50 to 60 Hz, is within 2 m (6.6 feet) of each device and
is powered from an independent circuit breaker. As with any equipment, using a
filter or surge suppressor is recommended.

Ethernet Cabling
To ensure proper operation when installing the switch into a network, make sure that
the current cables are suitable for 10BASE-T, 100BASE-TX or 1000BASE-T
operation. Check the following criteria against the current installation of your
network:
• Cable type: Unshielded twisted pair (UTP) or shielded twisted pair (STP) cables
with RJ-45 connectors; Category 3 or better for 10BASE-T, Category 5 or better
for 100BASE-TX, and Category 5, 5e or 6 for 1000BASE-T.
• Protection from radio frequency interference emissions
• Electrical surge suppression
• Separation of electrical wires (switch related or other) and electromagnetic fields
from data based network wiring
• Safe connections with no damaged cables, connectors or shields

3-1

Installing the Switch

RJ-45 Connector

Figure 3-1 RJ-45 Connections

Equipment Checklist
After unpacking this switch, check the contents to be sure you have received all the
components. Then, before beginning the installation, be sure you have all other
necessary installation equipment.

Package Contents
• Stackable Fast Ethernet Switch (MIL-SM4804G)
• Four adhesive foot pads
• Bracket Mounting Kit containing two brackets and eight screws for attaching the
brackets to the switch
• Power Cord—either US, Continental Europe or UK
• RS-232 console cable
• Stacking cable
• This Installation Guide
• Management Guide

Optional Rack-Mounting Equipment
If you plan to rack-mount the switch, be sure to have the following equipment
available:
• Four mounting screws for each device you plan to install in a rack—these are not
included
• A screwdriver (Phillips or flathead, depending on the type of screws used)

3-2

Mounting

Mounting
This switch can be mounted in a standard 19-inch equipment rack or on a desktop or
shelf. Mounting instructions for each type of site follow.

Rack Mounting
Before rack mounting the switch, pay particular attention to the following factors:
• Temperature: Since the temperature within a rack assembly may be higher than
the ambient room temperature, check that the rack-environment temperature is
within the specified operating temperature range. (See page C-1.)
• Mechanical Loading: Do not place any equipment on top of a rack-mounted unit.
• Circuit Overloading: Be sure that the supply circuit to the rack assembly is not
overloaded.
• Grounding: Rack-mounted equipment should be properly grounded. Particular
attention should be given to supply connections other than direct connections to
the mains.
To rack-mount devices:
1.

Attach the brackets to the device using the screws provided in the Bracket
Mounting Kit.

Figure 3-2 Attaching the Brackets

3-3

3
2.

Installing the Switch
Mount the device in the rack, using four rack-mounting screws (not provided).

Figure 3-3 Installing the Switch in a Rack

If installing a single switch only, turn to “Connecting to a Power Source” at the
end of this chapter.

If installing multiple switches, mount them in the rack, one below the other, in
any order.

If also installing an RPS, mount it in the rack below the other devices.

Montage (Rack Mounting Instructions - German)
MIL-SM4804G Switch-Einheiten können an ein standardmäßiges 19-Zoll
Einrichtungsrack, einen Arbeitstisch oder ein Regal montiert werden. Folgend finden
Sie die Montageanweisungen für jeden Positionstyp.

Rack-Montage
Beachten Sie die folgenden Faktoren, bevor Sie die Rack-Montage beginnen:
•

Temperatur: Da die Temperatur innerhalb einer Rackeinheit höher als die
Raumumgebungstemperatur sein kann, stellen Sie bitte sicher, dass die
Rackumgebungstemperatur innerhalb des angegebenen Betriebstemperaturbereichs
liegt. (Siehe "Temperatur" auf Seite C-1.)
• Mechanische Last: Stellen Sie kein Gerät auf eine Rack-Montageeinheit.
• Stromüberlastung: Stellen Sie sicher, dass der Netzkreis der Rackeinheit nicht
überlastet wird.
• Erdung: Die Rack-Montageeinheit muss richtig geerdet werden. Besondere Acht sollten
Sie bei Verbindungen geben, die nicht direkt zum Netz führen.

3-4

Mounting
So montieren Sie Geräte an ein Rack:

1. Befestigen Sie die Metallwinkel mit den im Metallwinkel-Montageset erhältlichen
Schrauben an dem Gerät.
2. Befestigen Sie das Gerät mit vier Rackmontageschrauben (nicht beigelegt) an dem
Rack.
3. Wenn Sie nur einen Switch installieren, dann springen Sie bitte über zu "Verbinden mit
einer Stromquelle" auf Seite 3-8 am Ende dieses Kapitels.
4. Wenn Sie mehrere Switches installieren möchten, dann montieren Sie sie
untereinander in einer beliebigen Reihenfolge.

Desktop or Shelf Mounting
1.

Attach the four adhesive feet to the bottom of the first switch.

Figure 3-4 Attaching the Adhesive Feet

Set the device on a flat surface near an AC power source, making sure there
are at least two inches of space on all sides for proper air flow.

If installing a single switch only, go to “Connecting to a Power Source” at the
end of this chapter.

If installing multiple switches, attach four adhesive feet to each one. Place each
device squarely on top of the one below, in any order.

If also installing an RPS, place it close to the stack.

3-5

Installing the Switch

Installing an Optional SFP Transceiver

Figure 3-5 Installing an SFP Transceiver into a slot

This switch supports 1000BASE-SX, 1000BASE-LX, and 1000BASE-LH SFP
transceivers. To install an SFP transceiver, do the following:
1.

Consider network and cabling requirements to select an appropriate SFP
transceiver type.

Insert the transceiver with the optical connector facing outward and the slot
connector facing down. Note that SFP transceivers are keyed so they can only
be installed in one orientation.

Slide the SFP transceiver into the slot until it clicks into place.

Note: SFP transceivers are hot-swappable. The switch does not need to be powered off
before installing or removing a transceiver. However, always first disconnect the
network cable before removing a transceiver.
Note: SFP transceivers are not provided in the switch package.

Connecting Switches in a Stack
Figure 3-6 shows how the stack cables are connected between switches in a stack.
The connection is based on Gigabit Ethernet, using Category 5 or better cables. The
switch supports a line- and ring-topology stacking configuration, or can be used stand
alone.

In line-topology stacking there is a single stack cable connection between each
switch that carries two-way communications across the stack. In ring-topology
stacking, an extra cable is connected between the top and bottom switches forming
a “ring” or “closed-loop.” The closed-loop cable provides a redundant path for the
stack link, so if one link fails, stack communications can be maintained. Figure 3-6
illustrates a ring-topology stacking configuration.

3-6

Connecting Switches in a Stack

You can form a stack containing up to four MIL-SM4804G units. To connect switches
in a stack, perform the following steps:
1.

Enable the stacking ports on each unit (i.e., the Stack button pushed out)
Note: Pressing the Stack button during normal operation will cause the system to
reboot.

Plug one end of a stack cable (ordered separately) into the Down (left) port of
the top unit.

Plug the other end of the stack cable into the Up (right) port of the next unit.

Repeat steps 1 and 2 for each unit in the stack. Form a simple chain starting at
the Down port on the top unit and ending at the Up port on the bottom unit
(stacking up to 4 units).

(Optional) To form a wrap-around topology, plug one end of a stack cable into
the Down port on the bottom unit and the other end into the Up port on the top
unit.

PWR
Diag
RPS

19/20

21/22

23/24

Stack
Master

PWR
Diag
RPS

19/20

21/22

23/24

Stack
Master

PWR
Diag
RPS

19/20

21/22

23/24

Stack
Master

Figure 3-6 Connecting Switches in a Ring-topology Stack

3-7

3
6.

Installing the Switch
Select the Master unit in the stack by pressing in the Master button on only one
of the switches. Only one switch in the stack can operate as the Master, all
other units operate in slave mode. If more than one switch in the stack is
selected as Master, or if no switches are selected, the stack will not function.

Connecting to a Power Source
To connect a switch to a power source:
1.

Insert the power cable plug directly into the AC receptacle located at the back
of the switch.
MIL-SM4804G

RPS

DC
12V 4.5A
100-240V~ 50-60Hz 2A

Figure 3-7 Power Receptacles

Plug the other end of the cable into a grounded, 3-pin, AC power source.
Note: For International use, you may need to change the AC line cord. You must
use a line cord set that has been approved for the receptacle type in your
country.

Check the front-panel LEDs as the device is powered on to be sure the PWR
LED is lit. If not, check that the power cable is correctly plugged in.

If you have purchased a Redundant Power Unit, connect it to the switch and to
an AC power source now, following the instructions included with the package.

3-8

Connecting to the Console Port

Connecting to the Console Port
The DB-9 serial port on the switch’s back panel is used to connect to the switch for
out-of-band console configuration. The command-line-driven configuration program
can be accessed from a terminal or a PC running a terminal emulation program. The
pin assignments used to connect to the serial port are provided in the following table.

Figure 3-8 Serial Port (DB-9 DTE) Pin-Out

Wiring Map for Serial Cable
Table 3-1 Serial Cable Wiring

Switch’s 9-Pin
Serial Port

Null Modem

PC’s 9-Pin
DTE Port

2 RXD (receive data)

<----------------------------

3 TXD (transmit data)

-----------------------------> 2 RXD (receive data)

5 SGND (signal ground) ------------------------------

3 TXD (transmit data)
5 SGND (signal ground)

No other pins are used.

The serial port’s configuration requirements are as follows:
•
•
•
•
•

Default Baud rate—9,600 bps
Character Size—8 Characters
Parity—None
Stop bit—One
Data bits—8

3-9

Installing the Switch

3-10

Chapter 4: Making Network Connections
Connecting Network Devices
These switches are designed to be connected to 10, 100 or 1000 Mbps network
cards in PCs and servers, as well as to other switches and hubs. They may also be
connected to remote devices using optional 1000BASE-SX, 1000BASE-LX, or
1000BASE-LH SFP transceivers.

Twisted-Pair Devices
Each device requires an unshielded twisted-pair (UTP) cable with RJ-45 connectors
at both ends. Use Category 5, 5e or 6 cable for 1000BASE-T connections, Category
5 or better for 100BASE-TX connections, and Category 3 or better for 10BASE-T
connections.

Cabling Guidelines
The RJ-45 ports on these switches support automatic MDI/MDI-X pinout
configuration, so you can use standard straight-through twisted-pair cables to
connect to any other network device (PCs, servers, switches, routers, or hubs).
See Appendix B for further information on cabling.
Caution: Do not plug a phone jack connector into an RJ-45 port. This will damage the
switch. Use only twisted-pair cables with RJ-45 connectors that conform to
FCC standards.

4-1

Making Network Connections

Connecting to PCs, Servers, Hubs and Switches
1.

Attach one end of a twisted-pair cable segment to the device’s RJ-45
connector.

Figure 4-1 Making Twisted-Pair Connections

If the device is a network card and the switch is in the wiring closet, attach the
other end of the cable segment to a modular wall outlet that is connected to the
wiring closet. (See the section “Network Wiring Connections.”) Otherwise,
attach the other end to an available port on the switch.
Make sure each twisted pair cable does not exceed 100 meters (328 ft) in
length.

Note: Avoid using flow control on a port connected to a hub unless it is actually required
to solve a problem. Otherwise back pressure jamming signals may degrade
overall performance for the segment attached to the hub.

As each connection is made, the Link LED (on the switch) corresponding to
each port will light to indicate that the connection is valid.

Network Wiring Connections
Today, the punch-down block is an integral part of many of the newer equipment
racks. It is actually part of the patch panel. Instructions for making connections in the
wiring closet with this type of equipment follows.
1.

Attach one end of a patch cable to an available port on the switch, and the other
end to the patch panel.

If not already in place, attach one end of a cable segment to the back of the
patch panel where the punch-down block is located, and the other end to a
modular wall outlet.

4-2

Twisted-Pair Devices
3.

Label the cables to simplify future troubleshooting. See “Cable Labeling and
Connection Records” on page 4-7.
Equipment Rack
(side view)

Switch

Punch-Down Block

Patch Panel

Wall

Figure 4-2 Network Wiring Connections

4-3

Making Network Connections

Fiber Optic SFP Devices
An optional Gigabit SFP transceiver (1000BASE-SX, 1000BASE-LX, or
1000BASE-LH) can be used for a backbone connection between switches, or for
connecting to a high-speed server.
Each single-mode fiber port requires 9/125 micron single-mode fiber optic cable with
an LC connector at both ends. Each multimode fiber optic port requires 50/125 or
62.5/125 micron multimode fiber optic cabling with an LC connector at both ends.
Warning: This switch uses lasers to transmit signals over fiber optic cable. The lasers are
compliant with the requirements of a Class 1 Laser Product and are inherently
eye safe in normal operation. However, you should never look directly at a
transmit port when it is powered on.
Note: When selecting a fiber SFP device, considering safety, please make sure that it
can function at a temperature that is not less than the recommended maximum
operational temperature of the product. You must also use an approved Laser
Class 1 SFP transceiver.
Hinweis: Bei der Wahl eines Glasfasertransceivers muß für die Beurteilung der
Gesamtsicherheit beachtet werden, das die maximale Umgebungstemperatur
des Transceivers für den Betrieb nicht niedriger ist als die für dieses Produkts.
Der Glasfasertransceiver muß auch ein überprüftes Gerät der Laser Klasse 1
sein.

Remove and keep the LC port’s rubber plug. When not connected to a fiber
cable, the rubber plug should be replaced to protect the optics.

Check that the fiber terminators are clean. You can clean the cable plugs by
wiping them gently with a clean tissue or cotton ball moistened with a little
ethanol. Dirty fiber terminators on fiber optic cables will impair the quality of the
light transmitted through the cable and lead to degraded performance on the
port.

4-4

Connectivity Rules
3.

Connect one end of the cable to the LC port on the switch and the other end to
the LC port on the other device. Since LC connectors are keyed, the cable can
be attached in only one orientation.

Figure 4-3 Making Fiber Port Connections

As a connection is made, check the Link LED on the switch corresponding to
the port to be sure that the connection is valid.

The 1000BASE-SX, 1000BASE-LX, 1000BASE-LH fiber optic ports operate at
1 Gbps, full duplex, with auto-negotiation of flow control. The maximum length for
fiber optic cable operating at Gigabit speed will depend on the fiber type as listed
under “1000 Mbps Gigabit Ethernet Collision Domain” on page 4-6.

Connectivity Rules
When adding hubs (repeaters) to your network, please follow the connectivity rules
listed in the manuals for these products. However, note that because switches break
up the path for connected devices into separate collision domains, you should not
include the switch or connected cabling in your calculations for cascade length
involving other devices.

1000BASE-T Cable Requirements
All Category 5 UTP cables that are used for 100BASE-TX connections should also
work for 1000BASE-T, providing that all four wire pairs are connected. However, it is
recommended that for all critical connections, or any new cable installations,
Category 5e (enhanced Category 5) or Category 6 cable should be used. The
Category 5e and 6 specifications include test parameters that are only
recommendations for Category 5. Therefore, the first step in preparing existing

4-5

Making Network Connections

Category 5 cabling for running 1000BASE-T is a simple test of the cable installation
to be sure that it complies with the IEEE 802.3-2002 standards.

1000 Mbps Gigabit Ethernet Collision Domain
Table 4-1 Maximum 1000BASE-T Gigabit Ethernet Cable Length
Cable Type

Maximum Cable Length

Category 5, 5e, or 6 100-ohm UTP or STP 100 m (328 ft)

Connector
RJ-45

Table 4-2 Maximum 1000BASE-SX Gigabit Ethernet Cable Lengths
Fiber Size

Fiber Bandwidth

Maximum Cable Length

Connector

62.5/125 micron
multimode fiber

160 MHz/km

2-220 m (7-722 ft)

200 MHz/km

2-275 m (7-902 ft)

50/125 micron multimode
fiber

400 MHz/km

2-500 m (7-1641 ft)

500 MHz/km

2-550 m (7-1805 ft)

Table 4-3 Maximum 1000BASE-LX Gigabit Ethernet Cable Length
Fiber Size

Fiber Bandwidth

Maximum Cable Length

Connector

9/125 micron
single-mode fiber

N/A

2 m - 5 km (7 ft - 3.2 miles)

Table 4-4 Maximum 1000BASE-LH Gigabit Ethernet Cable Length
Fiber Size

Fiber Bandwidth

Maximum Cable Length

9/125 micron
single-mode fiber

N/A

2 m - 70 km (7 ft - 43.5 miles) LC

Connector

100 Mbps Fast Ethernet Collision Domain
Table 4-5 Maximum Fast Ethernet Cable Length
Type

Cable Type

Max. Cable Length

100BASE-TX Category 5 or better 100-ohm UTP or STP 100 m (328 ft)

Connector
RJ-45

10 Mbps Ethernet Collision Domain
Table 4-6 Maximum Ethernet Cable Length

4-6

Type

Cable Type

Max. Cable Length

Connector

10BASE-T

Category 3 or better 100-ohm UTP

100 m (328 ft)

RJ-45

Cable Labeling and Connection Records

Cable Labeling and Connection Records
When planning a network installation, it is essential to label the opposing ends of
cables and to record where each cable is connected. Doing so will enable you to
easily locate inter-connected devices, isolate faults and change your topology
without need for unnecessary time consumption.
To best manage the physical implementations of your network, follow these
guidelines:
• Clearly label the opposing ends of each cable.
• Using your building’s floor plans, draw a map of the location of all
network-connected equipment. For each piece of equipment, identify the devices
to which it is connected.
• Note the length of each cable and the maximum cable length supported by the
switch ports.
• For ease of understanding, use a location-based key when assigning prefixes to
your cable labeling.
• Use sequential numbers for cables that originate from the same equipment.
• Differentiate between racks by naming accordingly.
• Label each separate piece of equipment.
• Display a copy of your equipment map, including keys to all abbreviations at each
equipment rack.

4-7

4-8

Making Network Connections

Appendix A: Troubleshooting
Diagnosing Switch Indicators
Table A-1 Troubleshooting Chart
Symptom

Action

PWR LED is Off

• Check connections between the switch, the power cord and the wall
outlet.
• Contact your dealer for assistance

PWR LED is Amber

• Internal power supply has failed. Contact your local dealer for
assistance.

Diag LED is Amber

• Power cycle the switch to try and clear the condition
• If the condition does not clear, contact your dealer for assistance

Stack Master LED is Flashing
Amber

• The stack has not completed its initial configuration. Wait a few
minutes for the process to complete.
• If flashing continues, check that the Master Select button is pressed in
on only one switch.
• Check that all stacking cables are properly connected.

Link LED is Off

• Verify that the switch and attached device are powered on.
• Be sure the cable is plugged into both the switch and corresponding
device.
• If the switch is installed in a rack, check the connections to the
punch-down block and patch panel.
• Verify that the proper cable type is used and its length does not exceed
specified limits.
• Check the adapter on the attached device and cable connections for
possible defects. Replace the defective adapter or cable if necessary.

Diagnosing Power Problems with the LEDs
The Power and RPS LEDs work in combination to indicate power status as follows.
Table A-2 Power/RPS LEDs
Power LED

RPS LED

Status

Green

Amber

Internal power functioning normally; RPS plugged in.

Green

Off

Internal power functioning normally; RPS not plugged in.

Amber

Green

Internal power faulty; RPS delivering power.

Off

Both internal power and RPS unplugged or not functioning.

A-1

Troubleshooting

Power and Cooling Problems
If the power indicator does not turn on when the power cord is plugged in, you may
have a problem with the power outlet, power cord, or internal power supply.
However, if the unit powers off after running for a while, check for loose power
connections, power losses or surges at the power outlet. If you still cannot isolate
the problem, the internal power supply may be defective.

Installation
Verify that all system components have been properly installed. If one or more
components appear to be malfunctioning (such as the power cord or network
cabling), test them in an alternate environment where you are sure that all the other
components are functioning properly.

In-Band Access
You can access the management agent in the switch from anywhere within the
attached network using Telnet, a web browser, or other network management
software tools. However, you must first configure the switch with a valid IP address,
subnet mask, and default gateway. If you have trouble establishing a link to the
management agent, check to see if you have a valid network connection. Then
verify that you entered the correct IP address. Also, be sure the port through which
you are connecting to the switch has not been disabled. If it has not been disabled,
then check the network cabling that runs between your remote location and the
switch.
Note:

The management agent accepts up to four simultaneous Telnet sessions. If the
maximum number of sessions already exists, an additional Telnet connection
will not be able to log into the system.

Stack Troubleshooting
If a stack fails to initialize or function, first check the following items:
•
•
•
•
•

Check that all stacking cables are properly connected.
Check if any stacking cables appear damaged.
Check that the Master select button is pressed in on only one unit in the stack.
Check that each unit has the stacking ports enabled (the Stack button pushed out).
Check that all switches in the stack are powered on.

After checking all items, reboot all the switches in the stack.

A-2

Appendix B: Cables
Twisted-Pair Cable and Pin Assignments
For 10/100BASE-TX connections, the twisted-pair cable must have two pairs of
wires. For 1000BASE-T connections the twisted-pair cable must have four pairs of
wires. Each wire pair is identified by two different colors. For example, one wire
might be green and the other, green with white stripes. Also, an RJ-45 connector
must be attached to both ends of the cable.
Caution:

DO NOT plug a phone jack connector into any RJ-45 port. Use only
twisted-pair cables with RJ-45 connectors that conform with FCC standards.

Caution:

Each wire pair must be attached to the RJ-45 connectors in a specific
orientation. (See “Straight-Through Wiring” and “Crossover Wiring” on the
next page for an explanation.)

The figure below illustrates how the pins on the RJ-45 connector are numbered. Be
sure to hold the connectors in the same orientation when attaching the wires to the
pins.

8
1

Figure B-1 RJ-45 Connector Pin Numbers

10BASE-T/100BASE-TX Pin Assignments
Use unshielded twisted-pair (UTP) or shielded twisted-pair (STP) cable for RJ-45
connections: 100-ohm Category 3 or better cable for 10 Mbps connections, or
100-ohm Category 5 or better cable for 100 Mbps connections. Also be sure that the
length of any twisted-pair connection does not exceed 100 meters (328 feet).
The RJ-45 ports on the switch base unit support automatic MDI/MDI-X operation, so
you can use straight-through cables for all network connections to PCs or servers, or
to other switches or hubs. In straight-through cable, pins 1, 2, 3, and 6, at one end of
the cable, are connected straight through to pins 1, 2, 3, and 6 at the other end of
the cable. When using any RJ-45 port on this switch, you can use either
straight-through or crossover cable.

B-1

Cables
Table B-1 10/100BASE-TX MDI and MDI-X Port Pinouts
Pin

MDI Signal Name

MDI-X Signal Name

Transmit Data plus (TD+)

Receive Data plus (RD+)

Transmit Data minus (TD-)

Receive Data minus (RD-)

Receive Data plus (RD+)

Transmit Data plus (TD+)

Receive Data minus (RD-)

Transmit Data minus (TD-)

4,5,7,8

Not used

Note: The “+” and “-” signs represent the polarity of the wires that make
up each wire pair.

Straight-Through Wiring
If the twisted-pair cable is to join two ports and only one of the ports has an internal
crossover (MDI-X), the two pairs of wires must be straight-through. (When
auto-negotiation is enabled for any RJ-45 port on this switch, you can use either
straight-through or crossover cable to connect to any device type.)
You must connect all four wire pairs as shown in the following diagram to support
Gigabit Ethernet.
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Straight-through Cable
White/Orange Stripe
Orange
End A

1
2
3
4
5
6
7
8

White/Green Stripe
Blue
White/Blue Stripe
Green
White/Brown Stripe

1
2
3
4
5
6
7
8

End B

Brown

Figure B-2 Straight-through Wiring

Crossover Wiring
If the twisted-pair cable is to join two ports and either both ports are labeled with an
“X” (MDI-X) or neither port is labeled with an “X” (MDI), a crossover must be
implemented in the wiring. (When auto-negotiation is enabled for any RJ-45 port on
this switch, you can use either straight-through or crossover cable to connect to any
device type.)

B-2

Twisted-Pair Cable and Pin Assignments

You must connect all four wire pairs as shown in the following diagram to support
Gigabit Ethernet.
EIA/TIA 568B RJ-45 Wiring Standard
10/100BASE-TX Crossover Cable
White/Orange Stripe
Orange
End A

White/Green Stripe

1
2
3
4
5
6
7
8

Blue
White/Blue Stripe
Green
White/Brown Stripe

1
2
3
4
5
6
7
8

End B

Brown

Figure B-3 Crossover Wiring

1000BASE-T Pin Assignments
All 1000BASE-T ports support automatic MDI/MDI-X operation, so you can use
straight-through cables for all network connections to PCs or servers, or to other
switches or hubs.
The table below shows the 1000BASE-T MDI and MDI-X port pinouts. These ports
require that all four pairs of wires be connected. Note that for 1000BASE-T
operation, all four pairs of wires are used for both transmit and receive.
Use 100-ohm Category 5, 5e or 6 unshielded twisted-pair (UTP) or shielded
twisted-pair (STP) cable for 1000BASE-T connections. Also be sure that the length
of any twisted-pair connection does not exceed 100 meters (328 feet).
Table B-2 1000BASE-T MDI and MDI-X Port Pinouts
Pin

MDI Signal Name

MDI-X Signal Name

Bi-directional Data One Plus (BI_D1+)

Bi-directional Data Two Plus (BI_D2+)

Bi-directional Data One Minus (BI_D1-)

Bi-directional Data Two Minus (BI_D2-)

Bi-directional Data Two Plus (BI_D2+)

Bi-directional Data One Plus (BI_D1+)

Bi-directional Data Three Plus (BI_D3+)

Bi-directional Data Four Plus (BI_D4+)

Bi-directional Data Three Minus (BI_D3-)

Bi-directional Data Four Minus (BI_D4-)

Bi-directional Data Two Minus (BI_D2-)

Bi-directional Data One Minus (BI_D1-)

Bi-directional Data Four Plus (BI_D4+)

Bi-directional Data Three Plus (BI_D3+)

Bi-directional Data Four Minus (BI_D4-)

Bi-directional Data Three Minus (BI_D3-)

B-3

Cables

Cable Testing for Existing Category 5 Cable
Installed Category 5 cabling must pass tests for Attenuation, Near-End Crosstalk
(NEXT), and Far-End Crosstalk (FEXT). This cable testing information is specified in
the ANSI/TIA/EIA-TSB-67 standard. Additionally, cables must also pass test
parameters for Return Loss and Equal-Level Far-End Crosstalk (ELFEXT). These
tests are specified in the ANSI/TIA/EIA-TSB-95 Bulletin, “The Additional
Transmission Performance Guidelines for 100 Ohm 4-Pair Category 5 Cabling.”
Note that when testing your cable installation, be sure to include all patch cables
between switches and end devices.

Adjusting Existing Category 5 Cabling to Run 1000BASE-T
If your existing Category 5 installation does not meet one of the test parameters for
1000BASE-T, there are basically three measures that can be applied to try and
correct the problem:
1. Replace any Category 5 patch cables with high-performance Category 5e or
Category 6 cables.
2. Reduce the number of connectors used in the link.
3. Reconnect some of the connectors in the link.

Fiber Standards
The current TIA (Telecommunications Industry Association) 568-A specification on
optical fiber cabling consists of one recognized cable type for horizontal subsystems
and two cable types for backbone subsystems.
Horizontal 62.5/125 micron multimode (two fibers per outlet).
Backbone 62.5/125 micron multimode or single-mode.
TIA 568-B will allow the use of 50/125 micron multimode optical fiber in both the
horizontal and backbone in addition to the types listed above. All optical fiber
components and installation practices must meet applicable building and safety
codes.

B-4

Appendix C: Specifications
Physical Characteristics
Ports
48 10/100BASE-TX, with auto-negotiation
Two 10/100/1000BASE-T shared with two SFP transceiver slots
Two 10/100/1000BASE-T or Stacking Ports (button selection)
Network Interface
Ports 1-48: RJ-45 connector, auto MDI/X
10BASE-T: RJ-45 (100-ohm, UTP cable; Category 3 or better)
100BASE-TX: RJ-45 (100-ohm, UTP cable; Category 5 or better)
Ports 49-52: RJ-45 connector, auto MDI/X
10BASE-T: RJ-45 (100-ohm, UTP cable; Category 3 or better)
100BASE-TX: RJ-45 (100-ohm, UTP cable; Category 5 or better)
1000BASE-T: RJ-45 (100-ohm, UTP or STP cable; Category 5, 5e or 6)
Buffer Architecture
4 Mbits
Aggregate Bandwidth
17.6 Gbps
Switching Database
8K MAC address entries
LEDs
System: PWR (Power Supply), Diag (Diagnostic),
RPS (Redundant Power Supply), Stack Master
Port: status (link, speed, and activity)
Weight
3.09 kg (6.81 lbs)
Size
44.0 x 23 x 4.4 cm (17.32 x 9.06 x 1.73 in.)
Temperature
Operating: 0°C to 50°C (32°F to 122°F)
Storage: -40°C to 70°C (-40°F to 158°F)

C-1

Specifications
Humidity
Operating: 5% to 95% (non-condensing)
Power Supply
Internal, auto-ranging transformer: 100 to 240 VAC, 50 to 60 Hz, 2A
External, supports a 14-pin connection for a redundant power supply
Power Consumption
54 Watts maximum
Maximum Current
2.0 A @ 100 VAC
1.0 A @ 240 VAC

Switch Features
Forwarding Mode
Store-and-forward
Throughput
Wire speed
Flow Control
Full Duplex: IEEE 802.3x
Half Duplex: Back pressure

Management Features
In-Band Management
SSH, Telnet, SNMP, RMON (4-group), or HTTP
Out-of-Band Management
RS-232 DB-9 console port
Software Loading
TFTP in-band, or XModem out-of-band

C-2

Standards

Standards
IEEE 802.3-2002
Ethernet, Fast Ethernet, Gigabit Ethernet
Full-duplex flow control
Link Aggregation Control Protocol
IEEE 802.1D Spanning Tree Protocol
IEEE 802.1w Rapid Spanning Tree Protocol
IEEE 802.1X Port Access Authentication
IEEE 802.1Q VLANs
ISO/IEC 8802-3

Compliances
Emissions
Industry Canada Class A
EN55022 (CISPR 22) Class A
EN 61000-3-2/3
FCC Class A
VCCI Class A
C-Tick - AS/NZS 3548 (1995) Class A
Immunity
EN 61000-4-2/3/4/5/6/8/11
Safety
CSA/CUS (CSA60950 & UL60950)
TÜV/GS (EN60950-1)
CB (IEC60950)

C-3

C-4

Specifications

Glossary
10BASE-T
IEEE 802.3 specification for 10 Mbps Ethernet over two pairs of Category 3, 4, or 5
UTP cable.

100BASE-FX
IEEE 802.3 specification for 100 Mbps Ethernet over two strands of 50/125, 62.5/
125 micron, or 9/125 micron core fiber cable.

100BASE-TX
IEEE 802.3u specification for 100 Mbps Ethernet over two pairs of Category 5 UTP
cable.

1000BASE-LH
Specification for long-haul Gigabit Ethernet over two strands of 9/125 micron core
fiber cable.

1000BASE-LX
IEEE 802.3z specification for Gigabit Ethernet over two strands of 50/125, 62.5/125
or 9/125 micron core fiber cable.

1000BASE-SX
IEEE 802.3z specification for Gigabit Ethernet over two strands of 50/125 or
62.5/125 micron core fiber cable.

1000BASE-T
IEEE 802.3ab specification for Gigabit Ethernet over 100-ohm Category 5, 5e or 6
twisted-pair cable (using all four wire pairs).

Auto-Negotiation
Signalling method allowing each node to select its optimum operational mode (e.g.,
speed and duplex mode) based on the capabilities of the node to which it is
connected.

Bandwidth
The difference between the highest and lowest frequencies available for network
signals. Also synonymous with wire speed, the actual speed of the data
transmission along the cable.

Glossary-1

Glossary
Collision
A condition in which packets transmitted over the cable interfere with each other.
Their interference makes both signals unintelligible.

Collision Domain
Single CSMA/CD LAN segment.

CSMA/CD
CSMA/CD (Carrier Sense Multiple Access/Collision Detect) is the communication
method employed by Ethernet, Fast Ethernet, and Gigabit Ethernet.

End Station
A workstation, server, or other device that does not forward traffic.

Ethernet
A network communication system developed and standardized by DEC, Intel, and
Xerox, using baseband transmission, CSMA/CD access, logical bus topology, and
coaxial cable. The successor IEEE 802.3 standard provides for integration into the
OSI model and extends the physical layer and media with repeaters and
implementations that operate on fiber, thin coax and twisted-pair cable.

Fast Ethernet
A 100 Mbps network communication system based on Ethernet and the CSMA/CD
access method.

Full Duplex
Transmission method that allows two network devices to transmit and receive
concurrently, effectively doubling the bandwidth of that link.

Gigabit Ethernet
A 1000 Mbps network communication system based on Ethernet and the CSMA/CD
access method.

IEEE
Institute of Electrical and Electronic Engineers.

IEEE 802.3
Defines carrier sense multiple access with collision detection (CSMA/CD) access
method and physical layer specifications.

IEEE 802.3ab
Defines CSMA/CD access method and physical layer specifications for
1000BASE-T Gigabit Ethernet. (Now incorporated in IEEE 802.3-2002.)

Glossary-2

Glossary
IEEE 802.3u
Defines CSMA/CD access method and physical layer specifications for
100BASE-TX Fast Ethernet. (Now incorporated in IEEE 802.3-2002.)

IEEE 802.3x
Defines Ethernet frame start/stop requests and timers used for flow control on
full-duplex links. (Now incorporated in IEEE 802.3-2002.)

IEEE 802.3z
Defines CSMA/CD access method and physical layer specifications for 1000BASE
Gigabit Ethernet. (Now incorporated in IEEE 802.3-2002.)

LAN Segment
Separate LAN or collision domain.

LED
Light emitting diode used for monitoring a device or network condition.

Local Area Network (LAN)
A group of interconnected computer and support devices.

Media Access Control (MAC)
A portion of the networking protocol that governs access to the transmission
medium, facilitating the exchange of data between network nodes.

MIB
An acronym for Management Information Base. It is a set of database objects that
contains information about the device.

Modal Bandwidth
Bandwidth for multimode fiber is referred to as modal bandwidth because it varies
with the modal field (or core diameter) of the fiber. Modal bandwidth is specified in
units of MHz per km, which indicates the amount of bandwidth supported by the fiber
for a one km distance.

Network Diameter
Wire distance between two end stations in the same collision domain.

Redundant Power Supply (RPS)
A backup power supply that automatically takes over in case the primary power
supply should fail.

Glossary-3

Glossary
RJ-45 Connector
A connector for twisted-pair wiring.

Switched Ports
Ports that are on separate collision domains or LAN segments.

TIA
Telecommunications Industry Association

Transmission Control Protocol/Internet Protocol (TCP/IP)
Protocol suite that includes TCP as the primary transport protocol, and IP as the
network layer protocol.

UTP
Unshielded twisted-pair cable.

Virtual LAN (VLAN)
A Virtual LAN is a collection of network nodes that share the same collision domain
regardless of their physical location or connection point in the network. A VLAN
serves as a logical workgroup with no physical barriers, allowing users to share
information and resources as though located on the same LAN.

Glossary-4

Index
Numerics
10 Mbps connectivity rules 4-6
100 Mbps connectivity rules 4-6
1000 Mbps connectivity rules 4-6
1000BASE-LH fiber cable length 4-6
1000BASE-LX fiber cable length 4-6
1000BASE-SX fiber cable length 4-6
1000BASE-T
pin assignments B-3
ports 1-3
100BASE-TX
cable length 4-6
ports 1-2
10BASE-T
cable length 4-6
ports 1-2

A
adhesive feet, attaching 3-5
air flow requirements 3-1
applications
central wiring closet 2-3
collapsed backbone 2-2
remote connections with fiber 2-4
VLAN connections 2-5

B
brackets, attaching 3-3
buffer size C-1
buffers, saturation of 1-3

C
cable
Ethernet cable compatibility 3-1
fiber standards B-4
labeling and connection records 4-7
lengths 4-6
cleaning fiber terminators 4-4
compliances
EMC C-3
safety C-3

connectivity rules
10 Mbps 4-6
100 Mbps 4-6
1000 Mbps 4-6
console port, pin assignments 3-9
contents of package 3-2
cooling problems A-2
cord sets, international 3-8

D
desktop mounting 3-5
device connections 4-1

E
electrical interference, avoiding 3-1
equipment checklist 3-2
Ethernet connectivity rules 4-6

F
Fast Ethernet connectivity rules 4-6
features C-2
management 1-8
switch 1-7
fiber cables 4-4
flow control, IEEE 802.3x 1-3
front panel of switch 1-1
full duplex connectivity 2-1

G
Gigabit Ethernet cable lengths 4-6
grounding for racks 3-3

I
IEEE 802.3x flow control 1-3
indicators, LED 1-5
installation
connecting devices to the switch 4-2
desktop or shelf mounting 3-5
network wiring connections 4-2
port connections 4-1, 4-4
power requirements 3-1
problems A-2

Index-1

Index
rack mounting 3-3
site requirements 3-1

problems, troubleshooting A-1

R
laser safety 4-4
LC port connections 4-4
LED indicators
Diag 1-6
Power 1-6
problems A-1
Stack 1-6
location requirements 3-1

rack mounting 3-3
rear panel of switch 1-1
rear panel receptacles 1-7
RJ-45 port
connections 4-1
pinouts B-3
RMON 1-2
RS-232 port 1-2
rubber foot pads, attaching 3-5

management
agent 1-2
features 1-8, C-2
out-of-band 1-2
SNMP 1-2
web-based 1-2
Maximum Fast Ethernet Cable
Distance 4-6
mounting the switch
in a rack 3-3
on a desktop or shelf 3-5
multimode fiber optic cables 4-4

screws for rack mounting 3-2
serial
cable 1-2
port 1-2
single-mode fiber optic cables 4-4
site selelction 3-1
SNMP agent 1-2
specifications
compliances C-2
environmental C-1
physical C-1
power C-2
standards
compliance C-2
IEEE C-3
status LEDs 1-5
surge suppressor, using 3-1
switch architecture 1-2
switching
introduction to 2-1
method 1-2

N
network
connections 4-1, 4-4
examples 2-2

O
out-of-band management 1-2

P
package contents 3-2
pin assignments B-1
1000BASE-T B-3
10BASE-T/100BASE-TX B-1
console port 3-9
DB-9 3-9
port saturation 1-3
ports, connecting to 4-1, 4-4
power, connecting to 3-8

Index-2

T
Telnet A-2
temperature within a rack 3-3
troubleshooting
in-band access A-2
power and cooling problems A-2
switch indicators A-1
twisted-pair connections 4-1

Index
V
VLANs
tagging 2-5

W
web-based management 1-2

Index-3

Index

Index-4

MIL-SM4804G
90000444 REV A

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