Huawei Technologies AP4050DN-HD Wireless LAN Access Point User Manual AP4050DN HD Hardware Installation and Maintenance Guide

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AP4050DN-HD
Hardware Installation and
Maintenance Guide
Issue
01
Date
2016-04-15
HUAWEI TECHNOLOGIES CO., LTD.
Copyright © Huawei Technologies Co., Ltd. 2016. All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior
written consent of Huawei Technologies Co., Ltd.
Trademarks and Permissions
and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
The purchased products, services and features are stipulated by the contract made between Huawei and
the customer. All or part of the products, services and features described in this document may not be
within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements,
information, and recommendations in this document are provided "AS IS" without warranties, guarantees or
representations of any kind, either express or implied.
The information in this document is subject to change without notice. Every effort has been made in the
preparation of this document to ensure accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
Huawei Technologies Co., Ltd.
Address:
Huawei Industrial Base
Bantian, Longgang
Shenzhen 518129
People's Republic of China
Website:
http://www.huawei.com
Email:
support@huawei.com
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AP4050DN-HD
Hardware Installation and Maintenance Guide
About This Document
About This Document
Intended Audience
This document describes hardware features of the 4050DN-HD and provides basic installation
methods.
This document is intended for:

Network planning engineers

Hardware installation engineers

Commissioning engineers

Onsite maintenance engineers

System maintenance engineers
Symbol Conventions
The symbols that may be found in this document are defined as follows.
Symbol
Description
Indicates an imminently hazardous situation
which, if not avoided, will result in death or
serious injury.
Indicates a potentially hazardous situation
which, if not avoided, could result in death
or serious injury.
Indicates a potentially hazardous situation
which, if not avoided, may result in minor
or moderate injury.
Indicates a potentially hazardous situation
which, if not avoided, could result in
equipment damage, data loss, performance
deterioration, or unanticipated results.
NOTICE is used to address practices not
related to personal injury.
Calls attention to important information,
best practices and tips.
NOTE is used to address information not
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AP4050DN-HD
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Symbol
About This Document
Description
related to personal injury, equipment
damage, and environment deterioration.
Change History
Changes between document issues are cumulative. The latest document issue contains all
changes made in previous issues.
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Initial commercial release
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AP4050DN-HD
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Contents
Contents
About This Document .................................................................................................................... ii
1 Product Overview ......................................................................................................................... 1
1.1 Device Structure ........................................................................................................................................................... 1
1.2 Indicator Description .................................................................................................................................................... 2
1.3 Basic Specifications ...................................................................................................................................................... 4
1.4 Ordering Information .................................................................................................................................................... 5
2 AP Installation ............................................................................................................................... 6
2.1 Preparing for Installation .............................................................................................................................................. 6
2.2 Installation Flowchart ................................................................................................................................................... 8
2.3 Unpacking the Equipment ............................................................................................................................................ 8
2.4 Determining the Installation Position ........................................................................................................................... 9
2.5 Installing the AP ......................................................................................................................................................... 10
2.5.1 Installing the Device on a Wall ................................................................................................................................ 10
2.5.2 Installing the Device on a Ceiling ............................................................................................................................ 14
2.5.3 Installing the device on a T-rail................................................................................................................................ 17
2.5.4 Installing the Device on a Pole ................................................................................................................................ 18
2.6 Cable Connection........................................................................................................................................................ 20
2.7 Connecting the Security Lock..................................................................................................................................... 21
2.8 Checking the Device After Installation ....................................................................................................................... 22
2.9 Powering on the AP .................................................................................................................................................... 23
3 Logging In to the Device ........................................................................................................... 24
3.1 Logging In to the Device Using STelnet/Telnet .......................................................................................................... 24
3.2 Logging In to the Device Through the Console Port .................................................................................................. 25
4 Hardware Failures ....................................................................................................................... 26
4.1 A Device Fails to Be Powered On .............................................................................................................................. 26
5 Appendix ...................................................................................................................................... 28
5.1 On-site Cable Assembly and Installation .................................................................................................................... 28
5.1.1 Cable Assembly Precautions .................................................................................................................................... 28
5.1.2 Assembling Power Cables ....................................................................................................................................... 29
5.1.3 Assembling Ethernet Cables .................................................................................................................................... 39
5.1.4 Installing Cable Accessories .................................................................................................................................... 53
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Contents
5.1.5 Replacing the Mold of the Crimping Tool ............................................................................................................... 69
5.2 Environmental Requirements for Device Operation ................................................................................................... 72
5.2.1 Environmental Requirements for an Equipment Room ........................................................................................... 72
5.2.2 Requirements for Power Supply .............................................................................................................................. 80
5.3 Equipment Grounding Specifications ......................................................................................................................... 82
5.3.1 General Grounding Specifications ........................................................................................................................... 82
5.3.2 Grounding Specifications for an Equipment Room ................................................................................................. 83
5.3.3 Grounding Specifications for Devices ..................................................................................................................... 83
5.3.4 Grounding Specifications for Communications Power Supply ............................................................................... 83
5.3.5 Grounding Specifications for Signal Cables ............................................................................................................ 84
5.3.6 Specifications for Laying Out Grounding Cables .................................................................................................... 84
5.4 Engineering Labels for Cables .................................................................................................................................... 85
5.4.1 Introduction to Labels .............................................................................................................................................. 85
5.4.2 Engineering Labels for Optical Fibers ..................................................................................................................... 93
5.4.3 Engineering Labels for Network Cables .................................................................................................................. 96
5.4.4 Engineering Labels for User Cables ........................................................................................................................ 97
5.4.5 Engineering Labels for Power Cables...................................................................................................................... 98
5.5 Guide to Using Optical Modules .............................................................................................................................. 101
5.6 Fault Tag ................................................................................................................................................................... 104
5.7 Installation Checklist ................................................................................................................................................ 105
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1 Product Overview
Product Overview
About This Chapter
The AP4050DN-HD has the following advantages:

2x2 MIMO

Good service support capabilities

High reliability

High security

Simple network deployment

Automatic AC discovery and configuration

Real-time management and maintenance
In compliance with 802.11ac Wave 2, the AP4050DN-HD can provide gigabit access for
wireless users, greatly improving wireless user experience.
The AP4050DN-HD provides basic 802.11n/ac WLANs for high-density scenarios of indoor
stadiums. It provides flexible distribution options in different environments and can work in
hybrid mode (AP+WDS).
1.1
Device Structure
1.2
Indicator Description
1.3 Basic Specifications
1.4
Ordering Information
1.1 Device Structure
Figure 1-1 shows the appearance of the AP4050DN-HD.
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Figure 1-1 Appearance of the AP4050DN-HD
Table 1-1 describes interfaces on the AP4050DN-HD.
Table 1-1 Interface description
No.
Name
Description
Default
Reset button: restores factory settings and restarts the
device if you hold down the button more than 3 seconds.
CONSOLE
Connects to a maintenance terminal for AP configuration
and management.
GE1/PoE_OU
10/100/1000M port: connects to the wired Ethernet and
supports PoE output.
GE0/PoE_IN
10/100/1000M port: connects to the wired Ethernet. The
port can connect to a PoE power supply to provide power
for the AP.
DC 12V
DC power socket: connects a 12 V power adapter to the
AP.
Security slot
Connects to a security lock.

Connects to a power supply. The AP supports the following power supply modes:PoE power supply
and DC power supply.

When the AP uses the DC power supply, use a power adapter for power supply; otherwise, the AP
may be damaged.
1.2 Indicator Description
The AP4050DN-HD provides only a single indicator, as shown in Figure 1-2.
Indicator colors may vary slightly at different temperature.
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Figure 1-2 Indicator
Table 1-2 Indicator description
Type
Color
Status
Description
Default status after
power-on
Green
Steady on
The AP is just
powered on and the
software is not
started yet.
Software startup
status
Green
Steady on after
blinking once
After the system is
reset and starts
uploading the
software, the
indicator blinks
green once. Until the
software is uploaded
and started, the
indicator remains
steady green.
Running status
Green
Blinking once every
2s (0.5 Hz)

The system is
running properly,
the Ethernet
connection is
normal, and
STAs are
associated with
the AP.

The system
enters the Uboot
CLI.
Blinking once every
5s (0.2 Hz)
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The system is
running properly,
the Ethernet
connection is
AP4050DN-HD
Hardware Installation and Maintenance Guide
Type
Color
1 Product Overview
Status
Description
normal, and no STA
is associated with
the AP. The system
is in low power
consumption state.
Alarm
Fault
Green
Red
Blinking once
Alarm Green every
0.25s (4 Hz)
Steady on

The software is
being upgraded.

After the
software is
uploaded and
started, the AP
requests to go
online on the AC
and maintains
this state until it
goes online
successfully on
the AC (before
the CAPWAP
link is
established).

The AP fails to
go online on the
AC (the
CAPWAP link
disconnects).
A fault that affects
services has
occurred, such as a
DRAM detection
failure or system
software loading
failure. The fault
cannot be
automatically
rectified and must be
rectified manually.
1.3 Basic Specifications
Table 1-3 provides basic specifications of the AP4050DN-HD.
Table 1-3 Basic Specifications
Item
Technical
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Description
Dimensions (H x
63mm×334mm×240mm
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Item
Description
specifications
W x D)
Power
specifications
Weight
1.43kg
System memory

256MB DDR3L

64MB NOR FLASH

DC: 12V±10%

PoE power supply: in compliance with IEEE
802.3af/at
Power input
Maximum power
consumption
Environment
specifications
12W
NOTE
The actual maximum power consumption depends on local
laws and regulations.
Operating
temperature

-60 m to +1800 m: -10°C to +50°C

1800 m to 5000 m: Temperature decreases by
1°C every time the altitude increases 300 m.
Storage
temperature
-40°C to +70°C
Operating
humidity
5% to 95% (non-condensing)
IP rating
IP41
Atmospheric
pressure
53kPa to 106kPa
1.4 Ordering Information
To place an order, contact technical support personnel.
Part Number
Description
50082948
Wireless LAN Equipment,AP4050DN-HD-USA,11ac,Double
Frequency,Built-in Antenna
50082947
Wireless LAN Equipment,AP4050DN-HD,11ac,Double
Frequency,Built-in Antenna
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AP Installation
About This Chapter
2.1
Preparing for Installation
2.2
Installation Flowchart
2.3
Unpacking the Equipment
2.4
Determining the Installation Position
2.5
Installing the AP
2.6 Cable Connection
2.7
Connecting the Security Lock
2.8 Checking the Device After Installation
2.9
Powering on the AP
2.1 Preparing for Installation
This section describes safety precautions and tool preparations for AP installation.
Safety Precautions

Take proper measures to prevent injuries and device damage.

Place the device in a dry and flat position away from any liquid and prevent the device
from slipping.

Keep the device clean.

Do not put the device and tools in the aisles.
Only the qualified personnel are permitted to install and remove the device and its accessories.
Before installation and operation, read the safety precautions carefully.
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Tool Preparation
To install APs, prepare tools listed in Table 2-1.
Table 2-1 Tools
Phillips screwdriver
Protective gloves
ESD gloves
Slip-proof glove
Marker
Hammer drill
Claw hammer
Diagonal pliers
Wire stripper
RJ45 crimping tool
Cable cutter
Network cable tester
Multimeter
Ladder
Safety helmet
Safety belt
Anti-skid shoes
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2.2 Installation Flowchart
The following figure shows the process for installing an AP.
Figure 2-1 Installation flowchart
2.3 Unpacking the Equipment
Before unpacking the carton, ensure that the packing carton is intact and not damaged or
soaked. Stop unpacking if the equipment is rusted or soggy. Then, investigate causes and
contact the supplier.
After unpacking, check items in the carton against the packing list. If any item is missing,
contact the supplier or agent.
Usually, the packing list contains the following items.

AP device

Indoor fixed sheet metal mounting bracket

DC power adapter (optional)

Screw

Adjustable buckle

Hose clamp (optional)

Expansion screws
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
Quick start guide

Warranty card

MAC address label

SN label
2 AP Installation
If a PoE adapter is required, you need to purchase it separately.

If a PoE adapter is required, you need to purchase it separately.

The angle-adjustable mounting kits need to be purchased separately.
2.4 Determining the Installation Position
Indoor APs are usually mounted on a wall or ceiling using sheet metal mounting brackets. The
installation position is determined by the site survey. There must be at least 200 mm clearance
between the cabling end of the AP and the wall. Figure 2-2 shows space requirements.
Figure 2-2 Mounting an AP
When determining the AP installation position, comply with the following rules:

Try to reduce the number of obstacles, such as walls, between the AP and user terminals.

Place the AP far away from electronic devices that may produce radio interference, such
as microwave ovens, other APs, antennas, and other radio communication devices. For
details, see Table 2-2.

Install the AP in a hidden position that does not affect daily lives and work of residents.
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
Install the AP in a site that is free from leaking or dripping water, heavy dew, and
humidity, and take protective measures to prevent water from flowing into the equipment
along the cable.

Do not install the AP in an environment with high temperature, dust, poisonous gases,
flammable or explosive objects, electromagnetic interference (from a radar station, radio
station, or substation), unstable voltage, violent shakes, or strong noise.
Table 2-2 General anti-interference requirements
Scenario
Deployment Distance Requirement
Indoor
installation

There should be at least a 7 m distance between antennas.

The antennas should be placed at least 2 m from the 4G antennas of
the carrier.

The antennas should be placed far away from electronic devices that
may produce interference, such as microwave ovens.
If antennas are embedded into APs, the deployment distance requirements on the antennas are those on
APs.
2.5 Installing the AP
Remove the protective film on the surface before installation to prevent electrostatic
discharge.
2.5.1 Installing the Device on a Wall
Mounting kits and expansion bolts are required to install the AP on a wall. The
AP4050DN-HD can be installed on a wall using an indoor fixed or angle-adjustable mounting
bracket.
The indoor fixed mounting bracket is delivered together with the AP, but the angle-adjustable mounting
bracket is optional and needs to be purchased separately.
Indoor Fixed Mounting Bracket
1.
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Fix the mounting bracket to the wall, adjust the installation position, and use the marker
to mark the drilling positions where expansion screws are installed.
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2.
Use a 6 mm drill bit to drill 25 mm to 30 mm deep holes in the drilling positions.
Hammer the expansion tubes into the holes until the expansion tubes are completely
embedded into the wall.
3.
Fix the mounting bracket to the wall and use the Phillips screwdriver to fasten three
expansion screws into the expansion tubes.
4.
Connect the cables. For details, see 2.6 Cable Connection.
5.
Align the mounting screws at the rear of the AP with the mounting holes on the sheet
metal mounting bracket and then press the AP downwards to secure the AP on the
bracket.
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Angle-Adjustable Mounting Bracket
1.
Place a base bracket against the wall and mark the drilling positions through holes of the
bracket, as shown in the following figure.
2.
Use an 8 mm drill bit to drill 35 mm to 40 mm deep holes in the drilling positions.
Hammer the expansion tubes into the holes until the expansion tubes are completely
embedded into the wall.
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3.
Place the base bracket against the wall and use a wrench to fasten two expansion screws
into the expansion tubes.
4.
Remove the topmost screw from the base bracket, hang the AP-side mounting bracket
onto the topmost screw, and tighten the screw until the screw passes through the hole of
the horizontal scale plate.
5.
Connect the cables. For details, see 2.6 Cable Connection.
6.
Align the mounting screws at the rear of the AP with the mounting holes on the bracket
and hang the AP on the bracket. Push the AP downward to secure the AP.
7.
Loosen the two screws at the horizontal direction, adjust the AP's angle at the horizontal
and vertical directions, and tighten the hex socket screws. Use M4x35 cruciform slot
screws to tighten the AP and mounting bracket from the side.
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
2 AP Installation
The angle-adjustable mounting bracket can adjust the AP's angle within ±60° at the vertical and
horizontal directions.
2.5.2 Installing the Device on a Ceiling
The AP4050DN-HD can be installed on a ceiling using an indoor fixed or angle-adjustable
mounting bracket.
Indoor Fixed Mounting Bracket
1.
Remove a ceiling tile, determine locations of mounting holes based on the distance
between two installation holes on the mounting bracket, use a hammer drill to drill holes
on the ceiling tile, and fix the mounting bracket to the ceiling tile.
The screws provided for ceiling-mounting of APs are 30 mm long and can be used to fix
an AP on a ceiling not thicker than 15 mm. To install APs on thicker ceilings, you need to
purchase longer screws.
1. Ceiling tile
2.
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2. Adjustable buckle
3. M4x30 screw
Connect the cables. For details, see 2.6 Cable Connection.
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3.
2 AP Installation
Hang the AP on the mounting holes by aligning the mounting screws at the rear of the
AP with the mounting holes on the bracket and push the AP horizontally to secure the
AP.
Angle-Adjustable Mounting Bracket
1.
Remove a ceiling tile and determine locations of mounting holes based on the distance
between two installation holes on the mounting bracket. Use a hammer drill to drill holes
on the ceiling tile and fasten a base bracket with the ceiling tile (with a tightening torque
of 3 N•m).
The screws provided for ceiling mounting of APs are 30 mm long and can be used to fix
an AP on a ceiling no thicker than 15 mm. To install APs on thicker ceilings, you need to
purchase longer screws.
1. Ceiling tile
2.
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2. U-shaped mounting bar
3. M6x35 screw
Remove the topmost screw from the base bracket, hang the AP-side mounting bracket
onto the topmost screw, and tighten the screw until the screw passes through the hole of
the horizontal scale plate.
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3.
Connect the cables. For details, see 2.6 Cable Connection.
4.
Align the mounting screws at the rear of the AP with the mounting holes on the bracket
and horizontally push the AP to secure it.
5.
Loosen the screws, adjust the AP's position as required, and tighten the hex socket
screws. Use M4x35 cruciform slot screws to tighten the AP and mounting bracket from
the side.
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
Ensure that the AP is securely installed on the mounting bracket and there must be 200 mm space
above and around the AP for maintenance.

The angle-adjustable mounting bracket can adjust the AP's angle within ±60° at the vertical and
horizontal directions.
2.5.3 Installing the device on a T-rail
The AP can be installed on a T-rail indoors using a fixed mounting bracket.
1.
Remove two ceiling tiles around the T-rail, use screws to fix the adjustable buckle to the
mounting bracket, hook the adjustable buckle to the T-rail, and secure the screw on the
adjustable buckle to fasten the mounting bracket and T-rail.
2.
Connect the cables. For details, see 2.6 Cable Connection.
3.
Hang the AP on the mounting holes by aligning the mounting screws at the rear of the
AP with the mounting holes on the bracket and push the AP horizontally to secure the
AP.
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
Before fixing the adjustable buckle with a screw, you need to adjust the buckle to a proper position
based on the T-rail width.

Ensure that the AP is correctly installed on the mounting bracket and there must be 200 mm space
above and around the AP for maintenance.
2.5.4 Installing the Device on a Pole
1.
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
The pole must have a diameter of 48 mm to 114 mm and a thickness of at least 2.5 mm.

The AP can be installed on a pole using an angle-adjustable mounting bracket, with it angle
adjustable within ±60° at the vertical and horizontal directions.
Determine the AP installation position and attach a base bracket on the pole using the
hose clamp.
a.
Use an M6 inner hex torque screwdriver to loosen the screw on the hose clamp to
open it.
b.
Lead the hose clamp through the mounting bracket and secure the mounting bracket
to the pole.
c.
Tighten and close the hose clamp.
d.
Use an M6 inner hex torque screwdriver to tighten the screw.
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2.
Remove the topmost screw from the base bracket, hang the AP-side mounting bracket
onto the topmost screw, and tighten the screw until the screw passes through the hole of
the horizontal scale plate.
3.
Connect the cables. For details, see 2.6 Cable Connection.
4.
Align the mounting screws at the rear of the AP with the mounting holes on the bracket
and hang the AP on the bracket. Push the AP downward to secure the AP.
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5.
2 AP Installation
Loosen the two screws at the horizontal direction, adjust the AP's angle at the horizontal
and vertical directions, and tighten the hex socket screws. Use M4x35 cruciform slot
screws to tighten the AP and mounting bracket from the side.
2.6 Cable Connection
Figure 2-3 describes the cable connections.
Figure 2-3 Appearance of the AP4050DN-HD
Table 2-3 Cable connections
No.
Cable or Device
Description
Network cable

CAT5E cables or higher must be used.

The service network cable cannot be connected to the
console port; otherwise, the AP may be damaged
when using PoE power supply. The network cable
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No.
Cable or Device
2 AP Installation
Description
length cannot exceed 100 m.

If the AP needs to connect to the Ethernet, ensure that
the Ethernet cable is working properly. If the Ethernet
cable is not working properly, for example, RJ45
connectors are short-circuited, the AP may fail to be
powered on or fail to work. Before connecting an
Ethernet cable to the AP, use the cable test tool to
check whether the cable is qualified. If the cable is
unqualified, replace it.
NOTICE
Do not insert a PoE input cable into the GE1/PoE_OUT port.
DC power adapter

When the AP uses the DC power supply, use a power
adapter for power supply; otherwise, the AP may be
damaged.
The AP is powered by either the DC power supply or PoE power supply that backs up each other.
Pay attention to the following points when bundling the cables:

Different types of cables must be separately routed with the minimum spacing of 30 mm
and cannot be entangled or crossed. Cables should be parallel or separated using
dedicated separators.

Bundled cables are closely arranged, straight, tidy, and undamaged.

Cable ties are bound neatly facing the same direction, and those at the same horizontal
line must be in a straight line. Cable tie tails should be cut smoothly and evenly.

Labels or nameplates must be attached to the cables after they are installed.
2.7 Connecting the Security Lock
There is a security slot on the device. You can lock the device to an immovable object to
prevent theft. The detailed procedures are as follows:
1.
Fasten the cable of the security lock to an immovable object around.
2.
Insert the security lock into the security slot and lock it.
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2 AP Installation
You need to purchase the security lock separately.
2.8 Checking the Device After Installation
Table 2-4 shows the items to be checked after installation is complete. For more details, see
Installation Checklist in the appendix.
Table 2-4 Installation checklist
No.
Check Item
The device is installed by strictly following the design draft. The
installation position meets space requirements, with maintenance space
reserved.
The device is securely installed.
The power cables are intact and not spliced.
Terminals of the power cables are welded or cramped firmly.
All power cables are not short-circuited or reversely connected and must
be intact with no damage.
The power cables and ground cables are separated from other cables and
bundled separately.
Connectors of signal cables are complete, intact, and tightly connected.
The signal cables are not damaged or broken.
Labels on cables are clear and correct.
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2 AP Installation
2.9 Powering on the AP
After the AP installation is complete, observe indicator on the AP to determine the system
running status. For details, see 1.2 Indicator Description.
Do not frequently power on and off the device.
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3 Logging In to the Device
Logging In to the Device
About This Chapter
3.1
Logging In to the Device Using STelnet/Telnet
3.2
Logging In to the Device Through the Console Port
3.1 Logging In to the Device Using STelnet/Telnet
You can log in to the device using STelnet V2 or Telnet to configure, manage, and maintain
the device in the CLI.

By default, only the STelnet V2 service is enabled on the device.

Telnet has security vulnerabilities. You are not advised to enable the Telnet service.
Before logging in to the device, complete the following tasks:

Power on the device.

Prepare network cables used to connect device interfaces.
The following table lists the default configuration of the device. You are advised to change the
default user name and password on your first login.
Table 3-1 Default configuration of the device
Parameter
Default Setting
User name
admin
Password
admin@huawei.com
IP address
169.254.1.1
Subnet mask
255.255.0.0
If the device is already online on the AC, you can remotely log in to the AC on a local terminal and run
the display ap all command to check the IP address of the device.
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3 Logging In to the Device
The following example uses the default parameters and is used for reference only.
Step 1 Use network cables and a LAN switch to connect the PC to the network interface of the
device.
Step 2 Assign the PC with an IP address on the same network segment as the default IP address of
the device so that the PC and device are reachable to each other.
If the device uses the default settings, the IP address of the PC must be in the network
segment 169.254.0.0/16 but cannot be 169.254.1.1. 169.254.1.100 is recommended.
Step 3 Start the CLI on the PC and access the IP address 169.254.1.1 of the device using STelnet V2.
Step 4 Enter the user name and password as prompted to log in to the user interface.
----End
3.2 Logging In to the Device Through the Console Port
Before logging in to the device, complete the following tasks:

Power on the device.

Prepare a console cable.

Prepare terminal simulation software.
If your PC's operating system provides terminal simulation software (like HyperTerminal in Windows
2000/XP), you do not need to install additional terminal simulation software. If the PC runs on an
operating system without terminal simulation software (like Windows 7), install third-party terminal
simulation software on the PC by referring to the user manual or online help.
Step 1 Use a console cable to connect the PC to the console port of the device.
Step 2 Start terminal emulation software on the PC, create a connection, and set communication
parameters as follows:

Bits per second: 9600

Data bits: 8

Parity: None

Stop bits: 1

Flow control (F): None
Step 3 Press Enter and enter the default user name admin and password admin@huawei.com as
prompted to log in to the user view. (The following information is only for reference.)
Login authentication
Username:
Password:
Info: You are advised to change the password to ensure security.
You are advised to change the default user name and password on your first login.
----End
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4 Hardware Failures
Hardware Failures
About This Chapter
This section describes common methods for troubleshooting typical hardware faults.
4.1
A Device Fails to Be Powered On
4.1 A Device Fails to Be Powered On
Fault Description
The SYS indicator of a device is off.
Possible Causes
Power Supply Mode
Possible Cause
Power supply using a power module

The device is powered off.

The power cable is not securely
connected to the device.

The power supply unit has failed.
PoE power supply
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−
If the device connects to an external
power source, its power adapter may
fail.
−
If the device has a built-in power
supply, the device itself may be
faulty.

The power sourcing equipment does not
support the PoE function or is faulty.

The power sourcing equipment is
incorrectly configured (the PoE function
is disabled or the power-off time range is
improperly set).

The line is faulty (the network cable or
distribution frame is damaged).
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Power Supply Mode
4 Hardware Failures
Possible Cause

The device is faulty.
Troubleshooting Procedure
Power Supply Mode
Troubleshooting Procedure
Power supply using a power module
1. Check whether the device is powered
off.
2. Check that the power cable is securely
connected to the device.
3. Check whether the power supply is
normal.
Replace the power adapter with a normal
one. If the device is powered on, the
original power adapter is faulty. Contact
technical support personnel or Huawei
agent and ask them to replace the power
adapter.
4. If the device still cannot be powered on,
the device itself is faulty. Contact
technical support personnel or Huawei
agent and ask them to replace the device.
PoE power supply
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1. Check whether the power sourcing
equipment supports PoE or is faulty.
2. Check whether the configuration on the
power sourcing equipment causes PoE
power supply errors, such as the PoE
function is disabled or the power-off
time range is incorrectly set.
3. Check whether the network cable or
distribution frame is faulty.
4. If the device still cannot be powered on,
the device itself is faulty. Contact
technical support personnel or Huawei
agent and ask them to replace the device.
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5 Appendix
Appendix
About This Chapter
5.1
On-site Cable Assembly and Installation
5.2
Environmental Requirements for Device Operation
5.3
Equipment Grounding Specifications
5.4
Engineering Labels for Cables
5.5
Guide to Using Optical Modules
5.6
Fault Tag
5.7
Installation Checklist
5.1 On-site Cable Assembly and Installation
5.1.1 Cable Assembly Precautions
Checking the Appearance of Cables

If the cable jacket or insulation is visibly dirty, clean it before assembly.

If the jacket or insulation of a cable has visible damage, irreparable scuffing, or other
defects, do not use the cable.

If the shield layer of a cable is damaged, do not use the cable.

If the cable jacket or insulation cracks after the cable is bent or twisted, discard this cable
and check whether other cables have the same problem. If other cables have the same
problem, replace these cables.
Checking the Appearance of Connectors

Do not use connectors with visible defects, damage, rust or scuffing.

Do not use connectors if their shells or pins have exposed part or uneven plating, or their
pins are lost, broken, or bent.

Do not use connectors that have dirt on their pins or in their jacks or if there are
conductors between pins or between pins and the shell.
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Precautions for Assembly

Use dedicated tools or tools delivered by Huawei and follow the methods given here
during assembly.

Hold terminals of cables instead of pulling the cables themselves when installing or
removing cable components.

Take the following precautions when cutting or stripping cables:

−
Make cables slightly longer than necessary.
−
Coil cables longer than 2 m (6.56 ft) after cutting. Bind and fasten the coils using
bundling ropes. The inner diameters of the coils should be larger than 20 times the
outer diameters of the cables.
−
When stripping the jackets of cables, avoid damaging the shield layers (braid or
aluminum foil), insulation, core conductors, and other jackets that do not need to be
stripped.
−
After assembling cables, cut all visible cross sections of jackets to ensure that the
cross sections are arranged neatly.
−
Do not touch the core conductors of cables with your hands. Terminate exposed
conductors in a timely way after stripping off insulation so that the surface of the
conductors does not become oxidized.
Take the following precautions when crimping and connecting cables or connectors:
−
The terminals and conductors should be connected tightly after they are crimped.
They should not be moved or turned.
−
Cut all the exposed copper wires.
−
Try to avoid a second crimping of sleeves.
−
Keep all the conductors clean and aligned.
The connectors, cables, and tools provided by different vendors may be different. The figures in this
document are for your reference only.
5.1.2 Assembling Power Cables
Assembling the OT Terminal and Power Cable
Context
Figure 5-1 shows the components of an OT terminal and a power cable.
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Figure 5-1 Components of an OT terminal and a power cable
A. Heat-shrinkable tubing
B. Bare crimping terminal
C. Insulation
D. Conductor
Procedure
Step 1 Based on the cross-sectional area of the cable conductor, strip a length of insulation coating C
to expose the conductor D of length L1, as shown in Figure 5-2. The recommended values of
L1 are listed in Table 5-1.
Figure 5-2 Stripping a power cable (OT terminal)
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
When you strip a power cable, do not damage the conductor of the cable.

If the bare crimping terminal is not provided by Huawei, the value of L1 is 1 mm (0.04 in.)
to 2 mm (0.08 in.) greater than the value of L.
Table 5-1 Mapping between the cross-sectional area of the conductor and the value of L1
Cross-Section
al Area of
Conductor
(mm2(in.2))
Value of L1
(mm(in.))
Cross-Sectional
Area of Conductor
(mm2(in.2))
Value of L1
(mm(in.))
1 (0.002)
7 (0.28)
10 (0.015)
11 (0.43)
1.5 (0.002)
7 (0.28)
16 (0.025)
13 (0.51)
2.5 (0.004)
7 (0.28)
25 (0.039)
14 (0.55)
4 (0.006)
8 (0.31)
35 (0.054)
16 (0.63)
6 (0.009)
9 (0.35)
50 (0.077)
16 (0.63)
If you are proficient in assembling OT terminals and power cables, you can obtain the value of L1 by
comparing the part to be crimped with the power cable.
Step 2 Put the heat-shrinkable (A) tubing onto the bare crimping terminal, as shown in Figure 5-3.
Figure 5-3 Putting the heat shrink tubing onto the bare crimping terminal
Step 3 Put the OT terminal B onto the exposed conductor, and ensure that the OT terminal is in good
contact with the insulation coating C, as shown in Figure 5-3.
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After the conductor is fed into the OT terminal, the protruding part of the conductor, or L2 in
Figure 5-3, must not be longer than 2 mm (0.08 in.).
Step 4 Crimp the joint parts of the bare crimping terminal and the conductor, as shown in Figure 5-4.
The shapes of crimped parts may vary with the crimping dies.
Figure 5-4 Crimping the joint parts of the bare crimping terminal and the conductor (OT terminal)
Step 5 Push the heat shrink tubing (A) toward the connector until the tube covers the crimped part,
and then use a heat gun to heat the tube, as shown in Figure 5-5.
Figure 5-5 Heating the heat shrink tubing (OT terminal)
Stop heating the shrink tubing when the connector is securely locked in the shrink tubing. Do
not heat the shrink tubing too long as this may damage the insulation coating.
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5 Appendix
----End
Assembling the JG Terminal and Power Cable
Context
Figure 5-6 shows the components of a JG terminal and a power cable.
Figure 5-6 Components of a JG terminal and a power cable
A. JG
terminal
B. Heat-shrinkable
tubing
C. Insulation layer of a
power cable
D. Conductor of a
power cable
Procedure
Step 1 Strip a part of the insulation to expose the cable conductor with a length of L, as shown in
Figure 5-7. The recommended values of L are listed in Table 5-2.
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5 Appendix

When you strip a power cable, do not damage the conductor of the cable.

If the bare crimping terminal is not provided by Huawei, you can adjust the value of L as
required.
Figure 5-7 Stripping a power cable (JG terminal)
Table 5-2 Mapping between the cross-sectional area of the conductor and the value of L
Cross-Sectional Area of Conductor
(mm2(in.2))
Value of L (mm(in.))
16 (0.025)
13 (0.51)
25 (0.039)
14 (0.55)
35 (0.054)
16 (0.63)
50 (0.077)
16 (0.63)
Step 2 Put the heat shrink tubing onto the bare crimping terminal, as shown in Figure 5-8.
Figure 5-8 Putting the heat shrink tubing onto the bare crimping terminal
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Step 3 Put the bare crimping terminal onto the exposed conductor, and ensure that the bare crimping
terminal is in good contact with the insulation of the power cable, as shown in Figure 5-8.
Step 4 Crimp the joint parts of the bare crimping terminal and the conductor, as shown in Figure 5-9.
Figure 5-9 Crimping the joint parts of the bare crimping terminal and the conductor (JG terminal)
Step 5 Push the heat shrink tubing toward the connector until the tube covers the crimped part, and
then use a heat gun to heat the tube, as shown in Figure 5-10.
Figure 5-10 Heating the heat shrink tubing (JG terminal)
----End
Assembling the Cord End Terminal and the Power Cable
Context
Figure 5-11 shows the components of a cord end terminal and a power cable.
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5 Appendix
Figure 5-11 Components of a cord end terminal and a power cable
A. Cord end
terminal
B. Insulation layer of a power
cable
C. Conductor of a power
cable
Procedure
Step 1 Strip a part of the insulation to expose the cable conductor with a length of L1, as shown in
Figure 5-12. The recommended values of L1 are listed in Table 5-3.
When you strip a power cable, do not damage the conductor of the cable.
Figure 5-12 Stripping a power cable (cord end terminal)
Table 5-3 Mapping between the cross-sectional area of the conductor and the value of L1
Cross-Section
al Area of
Conductor
(mm2(in.2))
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Value of L1
(mm(in.))
Cross-Sectional
Area of Conductor
(mm2(in.2))
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5 Appendix
Cross-Section
al Area of
Conductor
(mm2(in.2))
Value of L1
(mm(in.))
Cross-Sectional
Area of Conductor
(mm2(in.2))
Value of L1
(mm(in.))
1 (0.002)
8 (0.31)
10 (0.015)
15 (0.59)
1.5 (0.002)
10 (0.39)
16 (0.025)
15 (0.59)
2.5 (0.004)
10 (0.39)
25 (0.039)
18 (0.71)
4 (0.006)
12 (0.47)
35 (0.054)
19 (0.75)
6 (0.009)
14 (0.55)
50 (0.077)
26 (1.02)
Step 2 Put the cord end terminal onto the conductor, and ensure that the conductor is aligned with the
edge of the cord end terminal, as shown in Figure 5-13.
After the conductor is fed into the cord end terminal, the protruding part of the conductor
must not be longer than 1 mm (0.04 in.).
Figure 5-13 Putting the cord end terminal onto the conductor
Step 3 Crimp the joint parts of the cord end terminal and the conductor, as shown in Figure 5-14.
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Figure 5-14 Crimping the cord end terminal and the conductor
Step 4 Check the maximum width of the tubular crimped terminal. The maximum width of a tubular
crimped terminal is listed in Table 5-4.
Table 5-4 Maximum width of a tubular crimped terminal
Cross-Sectional Area of Tubular
Terminal (mm2(in.2))
Maximum Width of Crimped Terminal
W1 (mm(in.))
0.25 (0.0004)
1 (0.04)
0.5 (0.0008)
1 (0.04)
1.0 (0.0015)
1.5 (0.06)
1.5 (0.0023)
1.5 (0.06)
2.5 (0.0039)
2.4 (0.09)
4 (0.006)
3.1 (0.12)
6 (0.009)
4 (0.16)
10 (0.015)
5.3 (0.21)
16 (0.025)
6 (0.24)
25 (0.039)
8.7 (0.34)
35 (0.054)
10 (0.39)
----End
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5 Appendix
5.1.3 Assembling Ethernet Cables
Assembling the Shielded RJ45 Connector and Ethernet Cable
Context
Figure 5-15 shows the components of an RJ45 connector and a shielded Ethernet cable.
Figure 5-15 Shielded RJ45 connector and cable
A. Jacket of
connector
B. Metal shell of
connector
C. Wire holder of
connector
D. Plug of
connector
E. Jacket of
Ethernet cable
F. Shield layer of
Ethernet cable
G. Twisted-pair wires
Procedure
Step 1 Fit the jacket of the connector onto the Ethernet cable, as shown in Figure 5-16.
Figure 5-16 Fitting the jacket of the connector onto the Ethernet cable
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Step 2 Remove a 30 mm (1.18 in.) long section of the jacket, cut off the nylon twine inside the jacket,
and cut a no more than 5 mm (0.20 in.) cleft in the jacket, as shown in Figure 5-17.

When you remove a section of the jacket, do not damage the shield layer of the
twisted-pair cable.

When you remove the shield layer, do not damage the insulation of the twisted-pair cable.
Figure 5-17 Removing the jacket of a twisted-pair cable (unit: mm (in.))
Step 3 Fit the metal shell onto the twisted-pair cable. The shield layer is covered by the metal shell,
as shown in Figure 5-18.
Figure 5-18 Fitting the metal shell onto the twisted-pair cable
Step 4 Fit the metal shell onto the twisted-pair cable until the shield layer is covered completely.
Along the edge of the metal shell, cut off the aluminum foil shield layer and ensure that there
is no surplus copper wire. The exposed twisted-pair cable is about 20 mm (0.79 in.) long, as
shown in Figure 5-19.
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Figure 5-19 Removing the shield layer of a twisted-pair cable (unit: mm (in.))
Step 5 Lead the four pairs of twisted-pair wires through the wire holder, as shown in Figure 5-20 and
Figure 5-21. Ensure that the colored wires are in the correct location in the cable.
Figure 5-20 Leading wires through the wire holder
G C
Figure 5-21 Cable locations in a wire holder
White-Orange
Orange
White-Green
Green
Blue
White-Blue
White-Brown
Brown
Step 6 Align the four pairs of cables in the holder, as shown in Figure 5-22. The connections
between the wires and the pins are shown in Figure 5-23 and listed in Table 5-5.
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Figure 5-22 Four pairs of cables on a wire holder
Figure 5-23 Connections between wires and pins
White-Orange
Orange
White-Green
Blue
White-Blue
Green
White-Brown
Brown
Pin 8
Pin 1
Table 5-5 Connections between wires and pins (using a straight-through cable as an example)
Matching Pins of Wires
Wire Color
White-Orange
Orange
White-Green
Blue
White-Blue
Green
White-Brown
Brown
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Step 7 Cut off the surplus cables along the lower edge of the wire holder, as shown in Figure 5-24.
Figure 5-24 Cutting off surplus cables
Step 8 Put the connector body onto the wire holder and turn the metal shell by 90°, as shown in
Figure 5-25.
Ensure that the wire holder is in good contact with the connector body.
Figure 5-25 Putting the connector body onto the wire holder
Step 9 Push the metal shell toward the connector body until the wire holder and the connector body
are engaged completely. Crimp the connector, as shown in Figure 5-26.
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Figure 5-26 Crimping the connector
Step 10 Push the jacket towards the metal shell until the metal shell is covered. This completes the
assembly of one end of the cable, as shown in Figure 5-27.
Figure 5-27 Pushing the metal shell
Step 11 To complete the assembly of the other end, repeat Step 1 through Step 10.
----End
Assembling an Unshielded RJ45 Connector and Ethernet Cable
Context
Figure 5-28 shows the components of an unshielded RJ45 connector and cable.
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5 Appendix
Figure 5-28 Components of an unshielded RJ45 connector and cable
A. Plug of connector
B. Jacket
C. Twisted-pair wires
Procedure
Step 1 Remove a 16-mm (0.63 in.) long section of the jacket, as shown in Figure 5-29.
When you remove the shield layer, do not damage the insulation of the twisted-pair cable.
Figure 5-29 Removing the jacket of a twisted-pair cable (unit: mm (in.))
Step 2 Align the four pairs of wires and cut the ends neatly, as shown in Figure 5-30. The
connections between the wires and the pins are listed in Table 5-6.
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Figure 5-30 Connections between wires and pins (unit: mm (in.))
White-Orange
Orange
White-Green
Blue
White-Blue
Green
White-Brown
Brown
Pin 8
16
Pin 1
Table 5-6 Connections between wires and pins (using a straight-through cable as an example)
Matching Pins of Wires
Wire Color
White-Orange
Orange
White-Green
Blue
White-Blue
Green
White-Brown
Brown
Step 3 Feed the cable into the plug, and crimp the connector, as shown in Figure 5-31.
When inserting the cable, check from the side or bore of the plug to ensure that the cable is completely
seated in the plug.
Figure 5-31 Crimping the connector
Step 4 To complete the assembly of the other end, repeat Step 1 through Step 3.
----End
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5 Appendix
Checking the Appearance of Contact Strips
Context

To ensure proper contact between the crimped wires and the wire conductors, the heights
and sizes of the contact strips must be standard and the same.

The contact strips must be parallel to each other, with an offset of less than ± 5°. The top
margin of a strip must be parallel to the axis of the connector, with an offset of less than
± 10°.

To ensure conductivity, the surface of the contact strips must be clean.

The contact strips must be in good contact with the RJ45 socket. The plastic separators
must remain intact and be aligned.

The contact strip blade must extend beyond the ends of the wires. The ends of the wires
must be in contact with the edge of the RJ45. The distance between them must be less
than 0.5 mm (0.02 in.).
Procedure
Step 1 Hold the crimped connector, with the front side facing you, and check whether the contact
strips are of the same height. The height should be 6.02 ± 0.13 mm (0.237 ± 0.005). If a
measuring tool is not available, you can compare the connector with a standard connector.
Figure 5-32 shows an unqualified piece, and Figure 5-33 shows a qualified piece.
All unqualified pieces must be crimped again.
Figure 5-32 Contact strips of different heights
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Figure 5-33 Contact strips of the same height
Step 2 Hold an RJ45 connector and turn it 45°. Observe the top edges of the metal contact strips.
Figure 5-34 shows an unqualified piece.
Figure 5-34 Unparallel contact strips of different heights
Step 3 Check whether the contact strips are clean. If they are not clean and the dirt cannot be
removed, replace it with a new RJ45 connector. Figure 5-35 shows an unqualified piece.
Figure 5-35 Dirt on a contract strip
Step 4 Check whether the contact strips and the plastic separators are well aligned and intact. If a
separator is skewed and cannot be fixed, replace it with a new RJ45 connector. Figure 5-36
shows an unqualified piece.
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Figure 5-36 Skewed plastic separators
Step 5 Hold the connector with the side facing towards you, and check whether you can see the
cross-sections of the wires. Ensure that the ends of the wires are in good contact with the edge
of the RJ45, and that the contact strip blade extends beyond the ends of the wires and is
crimped with the wires. If not, replace the connector. Figure 5-37 shows an unqualified piece.
Figure 5-37 Wires not in good contact with the edge of the RJ45
----End
Testing the Connection of Assembled Cables
Context
Huawei provides two types of Ethernet cables: straight-through cables and crossover cables.

Straight-through cables are connected in a one-to-one manner. They are used to connect
terminals such as a computer or switch to network devices. Table 5-7 lists the
connections of core wires in a straight-through cable.
Table 5-7 Connections of core wires in a straight-through cable
RJ45 Connector 1
RJ45 Connector 2
Core Wire Color
Twisted or Not
Orange
Twisted
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RJ45 Connector 1
RJ45 Connector 2
Core Wire Color
Orange-White
Green
Green-White
Blue
Blue-White
Brown
Brown-White

Twisted or Not
Twisted
Twisted
Twisted
Crossover cables are connected in a crossover manner. They are used to connect
terminals such as two computers or switches. Table 5-8 lists the connections of core
wires in a crossover cable.
Table 5-8 Connections of core wires in a straight crossover cable
RJ45 Connector 1
RJ45 Connector 2
Core Wire Color
Twisted or Not
Orange
Twisted
Orange-White
Green
Green-White
Blue
Blue-White
Brown
Brown-White
Twisted
Twisted
Twisted
Figure 5-38 shows the pins of an RJ45 connector.
Figure 5-38 Pins of an RJ45 connector
Pin8
Pin1
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Procedure
Step 1 Feed both connectors of the cable into the ports of the cable tester.
Step 2 After the connectors are properly inserted, turn on the tester. If the indicators from 1 to G turn
on simultaneously, you can infer that the pins work normally and the wires are correctly
connected.
Turn the switch to the S position to slow down lighting of the indicators so that you can see the
indicators more clearly, as shown in Figure 5-39.
Figure 5-39 Testing the conduction and connections of wires
Step 3 Gently shake the connector and repeat Step 2 to check whether the metal contact strips are in
good contact with the core wires and Ethernet ports, as shown in Figure 5-40.
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Figure 5-40 Checking the reliability
The procedure for testing a crossover cable is the same as that for testing a straight-through
cable except for the sequence in which the indicators turn on, which depends on the wire
connections of a crossover cable.
The Ethernet cable is qualified if the indicators turn on in the following sequence:
At the master (left) section of the tester, the indicators turn on in the sequence of 1-8-G. At the
slave (right) section of the tester, the indicators turn on in the sequence of 3-6-1-4-5-2-7-8-G.
If the indicators do not come on in this sequence, the Ethernet cable is unqualified.
If a tester is not available, you can use a multimeter to perform a simple test, as shown in Figure 5-41.
Figure 5-41 Testing the connection of an Ethernet cable
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----End
5.1.4 Installing Cable Accessories
Precautions for Installing Cable Accessories
Tools
The illustrations in this document may differ from actual situations, but the installation methods are the
same. For example, in this document, the adapters of cable connectors have separate interfaces. In the
actual situation, the adapters may have interfaces fixed on equipment.
Use dedicated tools provided or specified by Huawei and follow the installation procedure
described here.
Bending Radius
Unless otherwise specified, bending radius (R) of cables or fibers must meet the requirements
listed in Table 5-9.
Table 5-9 Bending radius of cables or fibers
Cable or Fiber
Bending Radius (R)
Ordinary cable
In normal cases, R ≥ 2d. When the cable is
connected with a connector, R ≥ 5d.
Fiber
R ≥ 40 mm (1.57 in.); Bending angle > 90°
The letter d indicates the diameter of a cable or fiber.
Precautions for Installation

Hold terminals of cables instead of pulling the cables themselves when installing or
removing cable components.

Do not insert a connector forcibly when the connector is blocked. Use a dedicated tool to
pull out the connector. Install the connector again after you check that the pins are
inserted properly.

Before tightening screws on cable connectors, ensure that the connectors are properly
connected to their adapters. Tighten the screw with appropriate force using a flat-head or
Phillips screwdriver instead of bare hands or an electric screwdriver. If the screw cannot
be screwed into the tapped hole, determine the reason and try again. Do not apply too
much force, or the screw or adapter may be damaged.

When removing densely aligned cables or fiber connectors, use dedicated pliers such as
cable-pulling pliers and fiber-pulling pliers.

Do not twist, bend, stretch, or extrude fibers during installation.

Cover the idle fiber connectors with dust caps. Remove the dust caps before using the
fiber connectors.
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Requirements for Cable Routing

To protect cables, remove the burrs in the cable through-holes or install protective rings
in the holes.

To ease the connection and to avoid stress, keep cable joints slack. After connecting
multiple cables to a connector that has multiple interfaces, keep the cables slack to avoid
generating stress.

Bind or clean cables gently because cable distortion affects signal quality.

Keep cables away from moveable components such as doors.

Sharp objects must not touch cable wiring to prevent damage to cables.

To protect power cables, route power cables of the active and standby power modules
separately.
Installing Power Adapters
Installing the OT Terminal
Procedure

Install an OT terminal.
a.
Align the hole of the OT terminal (conductor upward) with a connecting hole, as
shown in Figure 5-42.
Figure 5-42 Aligning the OT terminal with a connecting hole
When you install an OT terminal, the crimping sleeve is installed as shown in Figure 5-43, where A is
correct and B is incorrect.
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Figure 5-43 Installing an OT terminal, showing the orientation of crimping sleeve
b.
Place the spring washer and flat washer in turn, mount a matching screw, and fasten
it clockwise, as shown in Figure 5-44.
Figure 5-44 Installing two terminals back to back
Ensure that the OT terminal is not in contact with other terminals or metal components.
c.
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5-45.
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Figure 5-45 Installed OT terminal

Install two OT terminals on a post.
Before you install two OT terminals on a post, ensure that the two terminals can be
installed on the post and that the electrical connecting pieces have a large contact area.
Two OT terminals can be installed using any of these methods:
−
Bend the upper OT terminal at a 45- or 90-degree angle, as shown in Figure 5-46.
−
Cross the two terminals, as shown in Figure 5-47.
Figure 5-46 Bending the upper OT terminal at a 45- or 90-degree angle
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Figure 5-47 Crossing two terminals
If the two terminals are different sizes, place the smaller one above the bigger one. A
maximum of two terminals can be installed on a post.

To remove an OT terminal, loosen the screw counterclockwise.
----End
Installing the Cord End Terminal
Procedure
Step 1 Hold a cord end terminal upright and place it on a terminal jack, as shown in Figure 5-48. To
ensure bump contact and dense connection, place the plain side of the terminal outwards.
Figure 5-48 Placing a terminal on a terminal jack vertically
Step 2 Insert the terminal into the jack vertically, and turn the screw clockwise to fasten the terminal,
as shown in Figure 5-49.
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Figure 5-49 Feeding the terminal into the jack

Ensure that the exposed section of the terminal is less than 2 mm (0.079 in.) in length.

Do not press the insulation of the terminal.

Insert only one terminal into one jack.
Step 3 Move the cable slightly and ensure that it is securely connected.
Step 4 Before you remove a cord end terminal, loosen the screw counterclockwise.
----End
Installing Ethernet Adapters
Installing a Shielded Ethernet Connector
Procedure
Step 1 Hold the male and female connectors, with the male connector facing the female connector, as
shown in Figure 5-50.
Figure 5-50 Holding the male and female shielded connectors
Step 2 Insert the male connector into the female connector, as shown in Figure 5-51.
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Figure 5-51 Feeding the male shielded connector into the female shielded connector
Step 3 When you hear a click, the cable connector is completely inserted in the port. (The clip on the
cable connector pops up to fix the connector in the port.) Pull the connector slightly and
ensure that it is securely connected, as shown in Figure 5-52.
Figure 5-52 Installed shielded Ethernet connector
Step 4 To remove an Ethernet connector, press the locking key and pull out the connector, as shown
in Figure 5-53.
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Figure 5-53 Removing a shielded Ethernet connector
----End
Installing an Unshielded Ethernet Connector
Procedure
Step 1 Hold the male and female connectors, with the male connector facing the female connector, as
shown in Figure 5-54.
Figure 5-54 Holding the male and female unshielded connectors
Step 2 Feed the male connector into the female connector, as shown in Figure 5-55.
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Figure 5-55 Feeding the male connector into the female unshielded connector
Step 3 A crisp click indicates that the connector is locked by the locking key. Pull the connector
slightly and ensure that it is securely connected. Figure 5-56 shows an installed Ethernet
connector.
Figure 5-56 Installed unshielded Ethernet connector
Step 4 To remove an Ethernet connector, press the locking key and pull out the connector, as shown
in Figure 5-57.
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Figure 5-57 Removing an unshielded Ethernet connector
----End
Installing Fiber Connectors
Context

After you remove the dustproof cap, ensure that the fiber pins are clean and install them as
soon as possible.

When you disassemble fiber connectors, you must use a dedicated tool if the connectors
are densely installed.
Cleaning Fiber Connectors
Procedure
Step 1 Clean the pins of a fiber connector by using lint-free cotton and alcohol.
Step 2 Clean the pins again by using dust-free cotton. If necessary, clean the pins by using an air gun.
Ensure that the pins are free from any fiber or debris.
----End
Installing an FC Fiber Connector
Procedure
Step 1 Remove the dustproof cap of the FC connector and store it for future use.
Step 2 Align the core pin of the male connector with that of the female connector, as shown in Figure
5-58.
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Figure 5-58 Aligning the male connector with the female connector
Step 3 Align the male connector with the female connector and gently push the male connector until
it is completely seated in the female connector, as shown in Figure 5-59.
Figure 5-59 Feeding the male connector into the female connector
Step 4 Fasten the locking nut clockwise and ensure that the connector is securely installed, as shown
in Figure 5-60.
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Figure 5-60 Fastening the locking nut
Step 5 To disassemble an FC fiber connector, loosen the locking nut counterclockwise, and gently
pull the male connector, as shown in Figure 5-61.
Figure 5-61 Disassembling an FC fiber connector
----End
Installing an LC Fiber Connector
Procedure
Step 1 Remove the dustproof cap of the LC fiber connector and store it for future use.
Step 2 Align the core pin of the male connector with that of the female connector, as shown in Figure
5-62.
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Figure 5-62 Aligning the male connector with the female connector
Step 3 Align the male connector with the fiber adapter and gently push the male connector until it is
completely seated in the fiber connector, as shown in Figure 5-63.
Figure 5-63 Feeding the male connector into the female connector
Step 4 A clicking sound indicates that the male connector is locked, as shown in Figure 5-64.
Figure 5-64 Installed LC connector
Step 5 To disassemble an LC fiber connector, press the locking nut to release the locking clips from
the bore, and gently pull the male connector, as shown in Figure 5-65.
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Figure 5-65 Disassembling an LC fiber connector
----End
Installing the SC Fiber Connector
Procedure
Step 1 Remove the dustproof cap of the SC fiber connector and store it for future use.
Step 2 Align the core pin of the male connector with that of the female connector, as shown in Figure
5-66.
Figure 5-66 Aligning the male connector with the female connector
Step 3 Feed the fiber connector into the female connector, with your fingers holding the shell of the
fiber connector (not the pigtail). When you hear a click, the fiber connector is secured by the
clips (internal parts, not illustrated in the figure). Pull the fiber connector gently. If the
connector does not loosen, the installation is complete. See Figure 5-67.
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Figure 5-67 Installed SC fiber connector
Step 4 To disassemble an SC fiber connector, hold the shell of the connector (do not hold the fiber)
and gently pull the connector in the direction vertical to the adapter. Unlock the male
connector, and then separate it from the shell, as shown in Figure 5-68.
Figure 5-68 Disassembling an SC fiber connector
----End
Installing an MPO Connector
Procedure
Step 1 Remove the dustproof cap of the MPO fiber connector and store it for future use.
Step 2 Align the core pin of the male connector with that of the female connector, as shown in Figure
5-69.
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Figure 5-69 Aligning the male connector with the female connector
Step 3 Hold the shell labeled "PUSH" and feed the male connector into the female connector until
you hear a clicking sound. The male and female connectors are securely installed, as shown in
Figure 5-70.
Figure 5-70 Installed MPO fiber connector
Step 4 To disassemble an MPO fiber connector, hold the shell labeled "PULL" and remove the male
connector, as shown in Figure 5-71.
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Figure 5-71 Disassembling an MPO fiber connector
----End
5.1.5 Replacing the Mold of the Crimping Tool
Procedure
Step 1 Hold the handles of a pair of COAX crimping tools. Loosen the two fastening screws
counterclockwise, as shown in Figure 5-72.
Figure 5-72 Loosening two fastening screws
Step 2 Hold the handles of the COAX crimping tools to open the self-locking mechanism. The jaw
of the COAX crimping tools opens automatically, as shown in Figure 5-73.
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Figure 5-73 Pliers jaw opening automatically
Step 3 Remove the mold from the COAX crimping tools, as shown in Figure 5-74.
Figure 5-74 Removing the mold from the COAX crimping tools
Step 4 Place the mold to be installed into the jaw of the COAX crimping tools and align the screw
holes, as shown in Figure 5-75.
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Figure 5-75 Installing a new mold in the COAX crimping tool
Keep the short side of the mold inwards and the long side outwards, with the teeth of the mold
aligning from the larger size to the smaller size.
Step 5 Hold the handles of the COAX crimping tools tightly to match the mold and the jaw
completely. Align the screw holes, as shown in Figure 5-76.
Figure 5-76 Aligning the screw holes
Step 6 Hold the handles of the COAX crimping tools with one hand. Tighten the two fastening
screws clockwise. Figure 5-77 and Figure 5-78shows the mold installed in the COAX
crimping tool.
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Figure 5-77 Mold installed in the COAX crimping tool
Figure 5-78 An installed mold
----End
5.2 Environmental Requirements for Device Operation
5.2.1 Environmental Requirements for an Equipment Room
Requirements for Selecting a Site for an Equipment Room
When designing a project, consider the communication network planning and technical
requirements of the equipment. Also consider hydrographic, geological, seismic, power
supply, and transportation factors.
Construction, structure, heating and ventilation, power supply, lighting and fire-proof
construction of the equipment room should be designed by specialized construction designers
to suit the environmental requirements of devices. The equipment room should also follow
local regulations concerning the industrial construction, environmental protection, fire safety,
and civil air defense. Construction must conform to government standards, regulations, and
other requirements.
The equipment room should be located in a place free from high temperature, dust, toxic
gases, explosive materials, or unstable voltage. Keep the equipment room away from
significant vibrations or loud noises, as well as power transformer stations.
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The specific requirements for selecting a site for an equipment room are as follows:

The room should be located at a distance of at least 5 km (3.11 mi.) from heavy pollution
sources such as smelting and coal mines. It should be located at a distance of at least 3.7
km (2.30 mi.) from moderate pollution sources such as chemical, rubber, and
galvanization factories. It should be located at a distance of at least 2 km (1.24 mi.) from
light pollution sources such as packinghouses and tanyards. If these pollution sources
cannot be avoided, ensure that the equipment room is upwind of the pollution sources. In
addition, use a high-quality equipment room or protection products.

The room should be located away from livestock farms, or be upwind of the livestock
farms. Do not use an old livestock room or fertilizer warehouse as the equipment room.

The equipment room must be far away from residential areas. An equipment room that is
not far away from residential areas must comply with equipment room construction
standards to avoid noise pollution.

The room should be located far away from industrial and heating boilers.

The room should be at least 3.7 km (2.30 mi.) away from the seaside or salt lake.
Otherwise, the equipment room should be airtight with cooling facilities. In addition,
alkalized soil cannot be used as the construction material. Otherwise, equipment suitable
for wet conditions must be used.

The doors and windows of the equipment room must be kept closed to maintain an
airtight room.

Using steel doors to ensure sound insulation is recommended.

No cracks or openings are allowed on the walls or floors. The outlet holes on the walls or
windows must be sealed. Walls must be constructed such that they are smooth,
wear-resistant, dustproof, flame retardant, sound insulated, heat absorptive, and have
electromagnetic shielding.

The air vent of the room should be far from the exhaust of city waste pipes, big cesspools
and sewage treatment tanks. The room should be in the positive pressure state to prevent
corrosive gases from entering the equipment room and corroding components and circuit
boards.

It is recommended that the room be on or above the second floor. If this requirement
cannot be met, the ground for equipment installation in the room should be at least 600
mm (23.62 in,) above the maximum flood level.

The equipment room should be strong enough to resist winds and downpours.

The room should be located away from dusty roads or sand. If this is unavoidable, the
doors and windows of the equipment room must not face pollution sources.

Do not place air conditioning vents near the equipment so that they blow directly on the
equipment because condensation may be blown into the equipment.

Do not use decorative materials that contain sulfur in the equipment room.
Equipment Room Layout
An equipment room usually contains mobile switching equipment, telecommunications
equipment, power supply equipment, and other auxiliary equipment. To ensure easy
maintenance and management, place the equipment in different rooms. Figure 5-79 shows the
layout of the equipment room.
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Figure 5-79 Layout of the equipment room
Transmission
room
Control room
Generator room
Main communication
equipment room
Power distribution
room
Battery room
Substation room
Communication cable and optical cable
Power cable
The general layout principles of the equipment room are as follows:

It should meet requirements for laying out and maintaining communication cables and
power cables.

It should reduce the cabling distance, which facilitates cable maintenance, reduces
potential communication faults, and maximizes efficiency.
Construction Requirements for the Equipment Room
Table 5-10 describes the construction requirements for the equipment room.
Table 5-10 Construction requirements for the equipment room
Item
Requirements
Area
The smallest area of the equipment room can accommodate the
equipment with the largest capacity.
Net height
The minimum height of the equipment room should not be less than 3 m
(9.84 ft). The minimum height of the equipment room is the net height
below overhead beams or ventilation pipes.
Floor
The floor in the equipment room should be semi-conductive and
dustproof. A raised floor with an ESD covering is recommended. Cover
the raised floor tightly and solidly. The horizontal tolerance of each
square meter should be less than 2 mm (0.08 in.). If raised floors are
unavailable, use a static-electricity-conductive floor material, with a
volume resistivity of 1.0 x 107 ohms to 1.0 x 1010 ohms. Ground this
floor material or raised floor. You can connect them to ground using a
one megohm current-limiting resistor and connection line.
Load-bearing
capacity
The floor must bear loads larger than 150 kg/m2 (0.21 bf/in.2).
Door and
windows
The door of the equipment room should be 2 m (6.56 ft) high and 1 m
(3.28 ft) wide. One door is enough. Seal the doors and windows with
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Requirements
dustproof plastic tape. Use double-pane glass in the windows and seal
them tightly.
Wall surface
treatment
Paste wallpaper on the wall or apply flat paint. Do not use pulverized
paint.
Cable trays
Use cable trays to arrange cables. The inner faces of the cable trays must
be smooth. The reserved length and width of the cable trays, and the
number, position and dimensions of the holes must comply with the
requirements of device arrangement.
Water pipe
Do not pass service pipes, drainpipes, and storm sewers through the
equipment room. Do not place a fire hydrant in the equipment room, but
place it in the corridor or near the staircase.
Internal
partition wall
Separate the area where the equipment is installed from the equipment
room door. The partition wall can block some outside dust.
Installation
position of the
air conditioner
Install air conditioner vents so that the air does not blow directly on
equipment.
Other
requirements
Avoid the proliferation of mildew, and keep out rodents (like mice).
Figure 5-80 Internal partition wall inside the equipment room
Equipment Room Environment
Dust on devices may cause electrostatic discharge and result in poor contact for connectors or
metal connection points. This problem can shorten the life span of devices and cause faults.
The equipment room must be free from explosive, conductive, magnetically-permeable, and
corrosive dust. Table 5-11 lists the requirement for dust concentration in the equipment room.
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Table 5-11 Requirements for dust particles in the equipment room
Mechanical active
material
Unit
Concentration
Dust particle
Particle /m3
≤ 3x 104
(no visible dust accumulated
on a workbench in three
days)
Suspending dust
mg/m3
≤0.2
Precipitable dust
mg/m2·h
≤1.5
Description

Dust particle diameter ≥ 5 µm

Suspending dust diameter ≤ 75 µm

75 µm ≤ precipitable dust diameter ≤ 150 µm
Take the following measures to meet the requirements:

Use dustproof materials for ground, wall, and ceiling construction.

Use screens on the door and windows facing outside. The outer windows should be
dust-proof.

Clean the equipment room regularly and clean the air filter monthly.

Wear shoe covers and ESD clothing before entering the equipment room.
Requirements for Corrosive Gases
The room should be free from dusts and corrosive gases, such as SO2, H2S, and NH3. Table
5-12 lists the requirements for the corrosive gas concentration.
Table 5-12 Requirements for corrosive gas concentration
Chemical active
material
Unit
Concentration
SO2
mg/m3
≤0.20
H2S
mg/m3
≤0.006
NH3
mg/m3
≤0.05
Cl2
mg/m3
≤0.01
Take the following measures to meet the requirements:

Avoid constructing the room near a place where the corrosive gas concentration is high,
such as a chemical plant.

Ensure the air intake vent of the room is in the prevailing upwind direction from any
pollution source.
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
Place batteries in different rooms.

A professional service should monitor the corrosive gas conditions regularly.
5 Appendix
Requirements for ESD Prevention
The absolute value of electrostatic voltage must be less than 1000 V.
Take the following measures to meet this requirement:

Train operators about ESD prevention.

Keep the correct humidity level in the equipment room to reduce the impact of static
electricity.

Lay out an ESD floor in equipment rooms.

Wear ESD shoes and clothing before entering equipment room.

Use ESD tools, such as wrist straps, tweezers, and pullers.

Ground all conductive materials in the room, including computer terminals. Use ESD
worktables.

Keep non-ESD materials (such as common bags, foam, and rubber) at least 30 cm (11.81
in.) away from boards and ESD-sensitive components.
Electromagnetism Requirements for the Equipment Room
All interference sources, inside or outside the equipment room, can cause equipment problems
with capacitive coupling, inductive coupling, electromagnetic wave radiation, and common
impedance (including grounding system) coupling. Prevent the interference using these
approaches:

Take effective measures against electrical interference from the power supply system.

Do not use the working ground of the equipment as the same ground for surge protection.
Separate them as far as possible.

Keep the equipment far away from high-power radio transmitters, radar units, and
high-frequency and high-current equipment.

Use electromagnetic shielding if necessary.
Requirements for Lightning Proof Grounding
Table 5-13 lists the requirements for lightning proof grounding.
Table 5-13 Requirements for lightning proof grounding
Item
Requirements
Capital
construction

Use reinforced concrete to construct the equipment room.

Install a lightning proof device like a lightning rod outside the room.

The lightning proof ground shares the same grounding body with
the protective ground of the room.

After the low-voltage power cables are led into the room, install the
surge protector for the power cables in the AC voltage stabilizer and
the AC power distribution panel (box). Correctly ground the surge
protector nearby.

For an equipment room in urban area, install a power supply surge
Power cables
leading in the
equipment room
need to be
equipped with a
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Requirements
surge protector
Grounding for
DC power
distribution
Equipotential
connection
General
requirements for
grounding
Grounding
resistance
Routing of
signal cable
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5 Appendix
protector with the nominal discharge current of no less than 20 kA.
For an equipment room that is built in a suburb and subject to
lightning strikes, install a power supply surge protector with the
nominal discharge current of more than 60 kA. For an equipment
room that is built in a mountain area and subject to frequent
lightning strikes, or in a separate high-rise building in a city, install
a power supply surge protector with the nominal discharge current
of more than 100 kA.

The ground cable of the surge protector should be no longer than 1
m (3.28 ft).

Connect the DC working ground (positive pole of the -48 V DC
power supply or the negative pole of the 24 V DC power supply)
with the indoor collective ground cable nearby. The total ground
cable should meet the maximum load of the equipment.

The power equipment must have a DC working ground cable, which
can connect the power equipment to the collective ground cable of
the telecommunication site (or the protective ground bar of the
equipment room).

Properly ground the devices and auxiliary devices in the room such
as mobile base station, transmission, switching equipment, power
supply equipment, and cable distribution frame. Connect all PGND
cables to the collective protective ground bar. Connect all PGND
cables in one equipment room to one protective ground bar.

Apply joint grounding to the working ground and protective ground
of devices, which means the two share one grounding network.

The cable tray, rack or shell, metal ventilation pipe, metal door or
window of the equipment should be grounded for protection.

Do not connect the neutral line of the AC power cable with the
protective ground of any telecom equipment in the equipment room.

Do not install a fuse or switch on the ground cable.

All ground cables should be as short as possible, and arranged in a
straight line.

The grounding resistance must be lower than 1 ohm.

The upper end of the grounding body should be at least 0.7 m (2.30
ft) over the ground. In cold areas, bury the grounding body below
the frozen ground.

Measure the grounding resistance periodically to ensure effective
grounding.

Do not arrange the signal cables overhead in the equipment room.
All signal cables must be led into the site underground.

Use the cables with a metal jacket or place them into a metal pipe if
they come out/in the equipment room.

Ground the idle lines inside the cable in the equipment room.

Signal cables should be deployed on internal walls. Do not deploy
outdoor aerial cables.

Keep signal cables away from power cables and surge protection
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Requirements
devices.
Collective
ground cable

Use a ground ring or ground bar for the collective ground cable.

Do not use aluminum cables as ground cables. Adopt measures to
prevent electrification corrosion when connecting different metal
parts together.

Use a copper busbar as the collective ground cable with a
cross-sectional area of no less than 120 mm2 (0.19 in.2), or use the
galvanized flat steel of the same resistance. Insulate the collective
ground cable from the reinforcing steel bars of the building.
Grounding
lead-in
The grounding lead-in should be a maximum of 30 m (98.42 ft) long.
Use the galvanized flat steel with cross-sectional area of 40 mm x 4
mm (1.58 in. x 0.158 in.) or 50 mm x 5 mm (1.97 in. x 0.197 in.).
Grounding of the
cabinet

All the devices including the surge protection device in the cabinet
must be connected in an equipotential manner. The ground cables
can be aggregated to the ground bar or surge protector socket first,
and then the ground bar or surge protector socket can be connected
to the ground.

The resistance between the device ground terminals and ground bar
cannot exceed 0.1 ohm.

The cabinet can be grounded using the protecting earthing (PE) wire
of the electrical network in the building, zinc-coated angle steel, or
the main steel bar of the building.

If the cabinet is grounded using the PE wire of the electrical
network, use a multimeter to test the grounding status. If the voltage
between the PE wire and neutral wire is lower than 5 V and the
voltage between the PE wire and live wire is about 220 V, the PE
wire is grounded well. If the tested AC voltages are not within the
ranges, the cabinet must be grounded in other ways.

The yellow-green ground cable contains multiple copper wires. The
cross-sectional area of the ground cable must be no less than 6 mm2
(0.0093 in.2) and the length cannot exceed 3 m (9.84 ft.).

Ground cables cannot be twisted with signal cables.

Antirust and anticorrosion measures must be taken on the ground
terminals.

The fiber reinforcing rib can be directly connected to the ground bar
of the cabinet. Before wrapping the reinforcing rib with insulation
tape, cut a 0.5 m (1.64 ft.) segment from the reinforcing rib. Wrap
the reinforcing rib with at least five layers of insulation tape. Keep
the reinforcing rib at least 5 cm (1.969 in.) from the cabinet surface.
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5.2.2 Requirements for Power Supply
Requirements for AC Power Supply
An AC power supply system consists of power mains, uninterruptible power supplies (UPSs),
and self-supplied electric generators. In addition to meeting the requirements of the server
load, the AC power supply must have a simple connection line, safe operation, flexible
scheduling, and easy maintenance.
The low-voltage power supply should be 3-phase, 5-wire mode or monophase 3-wire mode.
This AC power supply should be 110 V/220 V, with a frequency of 50 Hz.
The UPS should supply the same power and operate at the same phase as the power mains.
The switching time between the UPS and mains should be less than 10 ms; otherwise, the
networking devices will reboot or reset.
For power distribution capacity in the equipment room, both the working current and fault
current of the devices should be considered. Ensure that independent AC power supplies
protect independent devices. Configure the current-carrying capacity of the protection switch
of the equipment room for more than that of the devices.
Table 5-14 lists the voltage range of the AC power supply for the devices.
Table 5-14 Voltage range of AC power supply
Item
Requirements
AC power capacity to
support the devices
-10% to +5% of the rated voltage
AC power capacity to
support the power modules
and important buildings
-15% to +10% of the rated voltage
Frequency of alternating
current
-4% to +4% of the rated value
Voltage wave shape sine
distortion
Within 5% of the rated voltage
The automated electric generator must have a standard interface that supports
telecommunication protocols, remote telecommunication, monitoring, and control.
AC power cables should meet the following specifications:

AC neutral should have a conductor with the same cross section as the phase line.

AC cables should have non-flammable insulation. The layout of AC cables should
comply with local regulations. Low-voltage power distribution rooms should comply
with local regulations.
Recommendations for AC Power Supply
The following are recommendations for the AC power supply.
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
If the voltage of the power mains that supply power directly to devices exceeds the rated
voltage by -10% to 5%, or exceeds the voltage range that devices can support, a voltage
regulating device or voltage stabilizing device is required.

If the mains do not supply power for the device directly, or if the mains voltage exceeds
the rated voltage by -15% to 10% or exceeds the input voltage range of the DC power
supply, a voltage regulating device or voltage stabilizing device is required.

A UPS or inverter power supply system is required to provide uninterrupted AC power to
support the telecommunication load.

If abnormalities occur on the mains, telecommunication servers should be equipped with
a self-supplied electric generator to support the key telecommunication load. The
capacity should be not less than 150% to 200% of the total uninterruptible power supply.

Storage batteries are usually installed in a parallel connection of two groups. UPS
storage batteries are generally installed in one group. The redundancy required for the
UPS can rely on concatenation or parallel connection. When an inverter or a UPS is used,
the active inverter is determined by the maximum power and a backup inverter is
required.
Requirements for DC Power Supply
The equipment room should receive stable and reliable DC power. Deploy the power
equipment near the telecommunications equipment to make the DC feeder as short as possible.
To reduce power consumption and installation cost, the loop voltage drop from the battery
port to the equipment port should be less than 3.2 V.

A large-scale enterprise can deploy an independent power supply system on each floor to
supply power to the telecommunications equipment room on the respective floor.

A medium-scale enterprise can use a power room and a battery room for centralized
power supply or use distributed power supply systems.

A small-scale enterprise can deploy an integrated power supply system in its equipment
room but must take measures to prevent corrosive gases released from batteries from
eroding circuit boards of telecommunications equipment.
Table 5-15 lists the specifications for the DC power supply.
Table 5-15 Specifications for the DC power supply
Item
Requirements
DC power
capacity to
support the surge
current
Greater than 1.5 times the rated current
Regulated
voltage precision
If the AC input voltage is in the range of 85% to 110% of the rated
value, and the load current is in the range of 5% to 100% of the rated
value, the output voltage of the rectifier ranges from -46.0 V to -56.4 V,
with the regulated voltage precision less than or equal to 1%.
Overshoot
amplitude of
switch on/off
Integral value of the DC output voltage ±5%
Peak noise
voltage
≤200 mV
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Item
Requirements
Dynamic
response
The recovery time is less than 200 ms. The overshoot is in the range of
the integral value of the DC output voltage ±5%.
Recommendations for DC Power Supply
The following are recommendations for the DC power supply.

Use distributed power supply mode. Use multiple DC power supply systems and put
power equipment in multiple locations.

Adopt a standard DC power supply system, and set the output voltage to the
communications equipment within the required range.

Improve reliability of the AC power supply system to reduce the necessary capacity of
storage batteries. For small offices, increase the capacity of storage batteries if it is
difficult to enhance reliability of the AC power supply system.

The total capacity of the high-frequency switching rectifier must satisfy the power of the
communication loading and battery charging. If there are 10 or fewer active rectifier
modules, configure one backup module. If there are more than 10 active modules,
configure one backup module for every 10 active modules.

Install storage batteries in two or more groups. The capacity is determined by the
duration for which the storage batteries must supply power. For most offices, the
batteries should be able to supply power for at least one hour.
5.3 Equipment Grounding Specifications
5.3.1 General Grounding Specifications
Table 5-16 shows the general grounding specifications.
Table 5-16 General grounding specifications
No.
Description
The working ground and protective ground, including the shielded ground and the
lightning-proof ground of the cable distribution frame should share the same
grounding conductor.
The cable trays, shells, metal ventilation pipes, metal doors and windows in the
equipment room should be grounded for protection.
The metal parts of the equipment which are electrically floating in normal
conditions should be grounded for protection.
The ground cable must be connected securely to the protective ground bar of the
equipment room.
Do not use other equipment as part of the ground cable or electrical connection.
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5.3.2 Grounding Specifications for an Equipment Room
The grounding resistance of a comprehensive communication building should be less than or
equal to one ohm. The grounding resistance of an ordinary communication office should be
less than five ohms. The grounding resistance in an area where the earth resistance rate is high
should be less than 10 ohms.
5.3.3 Grounding Specifications for Devices
Table 5-17 lists the equipment grounding specifications.
Table 5-17 Equipment Grounding Specifications
No.
Description
All communication devices and auxiliary devices (such as mobile base stations,
transmission and switching devices, power supply devices) in the equipment room
should be grounded for protection. Connect all protective ground for various
devices jointly to a general ground bar, and then to the same protective ground bar
in the room together with the protective ground (PGND) of the device.
The PGND of the equipment is shorted to the copper ground bar provided by the
customer. The short-circuiting cable used should be a yellow-green plastic
insulated cable with a copper core and a cross-sectional area greater than 25 sq.
mm (0.039 sq. in.).
There are grounding terminals and grounding lugs at the lower part of the front
door, rear door and side panel of the cabinet, connected to the grounding terminals
of the cabinet framework through connection cables with cross-sectional area of no
less than 1.6 sq. mm (0.002 sq. in.).
Ensure that all metal components of the cabinet conduct well. No insulating
coating should be sprayed on the connection part of the metal components.
Connect the cabinets in the same row by fastening captive screws and gaskets on
the top of the cabinets. Do not spray any coating into a rectangular area measuring
30 mm x 50 mm (1.18 in. x 1.97 in.) around the connection hole for a captive bolt.
Measures to prevent rust and corrosion must be taken for this area. Zinc
electroplating with iridescent yellow chromate conversion coating should be
applied to the gasket and nut to ensure good electrical contact.
When combining cabinets of the same type, short-circuiting cables are required to
connect the ground busbars (if any) of the cabinets. The cross-sectional area of the
short-circuiting cable is 6 sq. mm (0.009 sq. in.) and is no more than 300 mm (11.8
in.) long. Connect the two ends of the short-circuiting cable to the ground busbar
terminals of neighboring cabinets and fix them firmly.
5.3.4 Grounding Specifications for Communications Power
Supply
Table 5-18 shows the grounding specifications for communication power supplies.
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Table 5-18 Grounding specifications for communication power supplies
No.
Description
The inlet for the AC power cable at the equipment room should be equipped with a
surge protection device (C-level) with a nominal discharge current no less than 20
kA.
The protective ground for the power supply and that for communication equipment
share the same grounding conductor. If the power supply and the equipment are in
the same equipment room, use the same protective ground bar for them if possible.
Use a surge protection circuit on the AC power interface.
The positive of the -48 V DC power supply or negative pole of the 24 V DC power
supply should be grounded at the output of the DC power supply.
The working ground and protective ground of the DC power supply equipment
should use the same grounding conductor with the protective ground of the
switching equipment. If the power supply and equipment are in the same
equipment room, use the same protection ground bar for them if possible.
Add surge protection on the DC power interface.
5.3.5 Grounding Specifications for Signal Cables
Table 5-19 lists the grounding specifications for signal cables.
Table 5-19 Grounding specifications for signal cables
No.
Description
Equip the cable outdoors with a metal jacket, well grounded at both ends, or
connect the ends of the metal jacket to the protective ground bar of the equipment
room. For cables inside the equipment room, install surge protection devices at the
interface to the equipment. The PGND cable for the surge protection devices
should be as short as possible.
The incoming and outgoing signal cables to and from the office and unused wires
inside the cable should be grounded for protection.
The Tone & Data Access (TDA) cable must pass through the Main Distribution
Frame (MDF) with surge protective device (SPD) when going out of the office.
The cable's shield layer should be connected to the protective ground of the MDF.
The MDF should use the same grounding conductor as the cabinet.
Do not route signal cables overhead.
5.3.6 Specifications for Laying Out Grounding Cables
Table 5-20 shows the specifications for the ground cable.
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Table 5-20 Specifications for laying out ground cables
No.
Description
The grounding wire should not run parallel to or twist around the signal cable.
Bury ground underground or arrange them indoors. Do not route ground cables
overhead.
Do not connect two cables together to extend the PGND cable, or add any switches
or fuses.
The PGND cable should be an alternating yellow and green plastic insulated one
with a copper core.
The neutral line of the AC power cable cannot be connected to the protective
ground of transmission and communication equipment in the equipment room.
A PGND cable should be as short as possible, with a length of no more than 45 m
(147.64 ft).
5.4 Engineering Labels for Cables
An engineering label serves as an identifier for on-site installation and maintenance after the
installation. Labels on the cables facilitate correct and orderly connection of cables, and easy
maintenance after installation.
Engineering labels are specialized for power cables and signal cables:

Signal cables include network cables, optical fibers, and user cables.

Power cables include the AC power cables and DC power cables.
Fill in labels according to specified requirements to keep consistency of labels in the equipment room.
Make a relevant statement in the self-check report.
5.4.1 Introduction to Labels
Label Materials
Features:

Thickness: 0.09 mm (0.004 in.)

Color: chalk white

Material: polyester (PET)

Ambient temperature: -29°C (-20.2°F) to +149°C (300.2°F)

Printed by a laser printer and written with a marker

Pass UL and CSA authentication
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Type and Structure
Label for Signal Cables
The label for signal cables is L-shaped with fixed dimensions, as shown in Figure 5-81.
Figure 5-81 Label for signal cables
To specify more clearly the position of a cable, use the dividing lines on the label. For
example, there is a dividing line between the cabinet number and the chassis number, and
another one between the chassis number and the slot number. Each dividing line is light blue
(Pantone 656c) and 1.5 mm x 0.6 mm (0.06 in. x 0.02 in.).
The cut dotted line helps to fold the label when affixed to the cable, and its size is 1 mm x 2
mm (0.04 in. x 0.08 in.).
The word "TO:" (upside down in the figure) at the lower right corner of the label is used to
identify the opposite end of the cable on which the label is affixed.
Power Cable Label
The label for power cables should be attached to the identification plate on the cable ties that
are attached to the cable. The identification plate has an embossed area 0.2 mm x 0.6 mm
(0.008 in. x 0.02 in.) around (symmetric on both sides), and the area in the middle is for
affixing the label, as shown in Figure 5-82.
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Figure 5-82 Power cable label
Label Printing
The contents can be printed or written on the labels. Printing is recommended for the sake of
high efficiency and eye-pleasant layout.
Template for Printing
You can obtain a template from the Huawei local office to print labels.
The template is made in Microsoft Word. Follow these instructions to use the template:
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
You can modify the contents of the template. Do not change settings of centered
characters, direction, and fonts.

If many characters need to be filled in, decrease the font size, but make sure that the
printouts are clear and legible.
Merging Cells in the Template
To merge two or more cells, do as follows:
1.
Select Edit/Select All.
2.
Select Format/Borders and Shading/Borders. Select Box tab and click OK.
3.
Drag the mouse to select cells to be merged and select the Table/Merge Cells.
Requirements on the Printer
To print labels, use a laser jet printer of any model. Before printing labels, set up the page and
try printing.
1.
Try printing on ordinary paper with both sides blank. Place the blank paper over the
whole page of the label paper, and check whether the page setup conforms to the label
layout.
2.
Make sure the printer properties, such as "paper size" and "direction", have been set
correctly.
−
If the printout conforms to the sheet of labels, print the labels on the label paper.
−
If the printout does not conform, adjust the page setup and try printing again until
the correct printout is produced.
The method for adjusting the page setup is as follows.
1.
Select File/Page Setup.
2.
Select Layout and set Header and Footer as 0.
3.
Select the Margins tab page. Select Left for Gutter Position and adjust the values of Top,
Bottom, Left, and Right.
If the warning prompt as shown in Figure 5-83 appears before printing, click Ignore to continue the
printing.
Figure 5-83 Warning prompt before printing
After the page setup has been made correctly, save it for future use. This page setup is only
necessary the first time you use the template to print the labels.
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Requirements for Feeding the Printer
The label paper consists of two layers and has undergone multiple processing procedures such
as printing and cutting. No matter what model of printer you use, feed in the labels one page
at a time. To avoid jamming the labels, never use the auto-feed mode.
Feed in the label paper in the correct direction to ensure that the text is printed in a correct
position.
Requirements for the Printed Label
Make sure that the printed labels satisfy the following requirements:

All the printouts must be on the label, and nothing should be printed on the backing layer
of the label page.

Contents in the cells should be aligned in the center. In a single-line printout, the
dividing lines and the word "TO:" should not be covered by printed characters.

When the cells are merged and the printouts are made in multiple lines, avoid covering
the word "TO:" when printing the text. Use the space bar to move the text to the next
line.
Writing Labels
Writing Tools
To make sure the printouts are clear and legible, use black markers instead of ball-point pens
to write the labels.
If no marker is available, black ball-point pens are allowed, although not recommended.
Compared with ball-point pens, water-proof markers are better. When writing with a
ball-point pen, do not leave the oil on the label, which may contaminate the label and blur the
words.
The delivered marker has two nibs. Use the smaller nib to write the labels.
Font
For the sake of legibility, use standard block letters and numbers as shown in Table 5-21
(Times New Roman).
Table 5-21 Standard typeface for handwriting
Determine the size of characters based on the number of letters or digits and ensure that the
characters are distinct and tidy.
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Placement of text on a label is shown in Figure 5-84.
Figure 5-84 Placement of text on a label
Attaching Labels
After printing or writing the label, remove the label from the page and attach it to the signal
cable, or the identification plate of the power cable. The methods for attaching labels are
described in the following sections.
Label for Signal Cables

Choose the place to attach labels.
The label is attached 2 cm (0.79 in.) from the connector on a signal cable. In special
cases (for example, to avoid cable bending or affecting other cables), other positions are
allowed to attach the labels. The rectangular part with text is attached facing right or
downward, as shown in Figure 5-85. The details are as follows:
−
The identification card is to the right of the cable in vertical cabling.
−
The identification card should be downward when you lay out the cable
horizontally.
Figure 5-85 Text area of the label

Procedure for attaching labels
Figure 5-86 shows the methods and procedures for attaching labels.
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Figure 5-86 Label for signal cables
Power Cable Label
Remove the label from the backing page, and attach it to the identification plate on the cable
tie. The label should be attached to the rectangular flute on the identification plate, and
attached to only one side of the identification plate. The cable ties are bundled at 2 cm (0.79
in.) from the connectors, and other positions are allowed in special circumstances.
Cable ties should be bound on both ends of a cable. After the bundling, the finished
identification plate should be on top of the cable in horizontal cabling, or on the right side of
the cable in vertical cabling, as shown in Figure 5-87. The details are as follows:

The identification card is to the right of the cable in vertical cabling.

The identification card is on the top of the cable in horizontal cabling. Make sure that the
label is facing out.
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Figure 5-87 Binding the label for the power cable
Contents of Engineering Labels
Contents of Labels for Power Cables
Labels for power cables are affixed on only one side of the identification plates. On the labels,
there is information (the part after the word "TO:") about the location of the device on the
other end of the cable, like the location of control cabinet, distribution box or power socket.
Contents of Labels for Signal Cables
The two sides of the label affixed on the signal cable carry information about the location of
the ports connected to both ends of the cable. Figure 5-88 shows the information on both sides
of the labels affixed to the signal cables.

Area 1 contains the location information of the local end of the cable.

Area 2 (with the word "TO:") contains the location information of the opposite end of the
cable.

Area 3 has been folded up inside the label.
Figure 5-88 Printed parts on the label for signal cables
Seen from the cabling end of the equipment, the text part of the label is on the right side of the
cable. The side with "TO:" that is facing outside carries the location information of the
opposite end; and the other side carries the location information of the local end.
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In other words, the information in Area 1 at one end is the same as the information in Area 2
at the other end of the cable.
Precautions for Using Engineering Labels
When using labels, pay attention to the following points:

When printing, writing, or attaching labels, keep the labels clean.

Since the label paper is made of moistureproof material, ink-jet printers and ink pens
cannot be used to print and write labels.

Labels should be attached neatly. New-type labels are L-shaped. If they are pasted at
incorrect locations or in the incorrect direction, the appearance of the device is affected.

Power cable ties should be attached in the same positions on power cables, with
identification plates on the same side.

The positions of "up", "down", "left" or "right" are all based on the viewpoint of the
engineering person who is working on the label.
5.4.2 Engineering Labels for Optical Fibers
These labels are affixed to the optical fibers that connect the optical interfaces on the boards
in a chassis, or on the device boxes. There are two types of labels for optical cables:

One is for the fiber that connects the optical interfaces on two devices.

The other is for the fiber that connects the device and the ODF.
Labels for the Optical Fibers Connecting Devices
Meaning of the Label
Table 5-22 lists information on both sides of the labels affixed to the optical fibers that
connect two devices.
Table 5-22 Information on labels affixed to the fibers between two devices
Content
Meaning
Example
MN-B-C-D-R
/T
MN: cabinet
number
M: The cabinet rows from front to back are numbered
from A to Z.
N: The cabinet columns from left to right are numbered
from 01 to 99.
For example, A01 is the cabinet in row A and column
01.
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B: chassis
number
Numbered in bottom-up order with two digits, for
example, 01.
C: physical slot
number
Numbered in top-down and left-right order starting
from 01. For example, 01 is the first slot at the top left
of the chassis.
D: optical
interface
number.
Numbered in top-down and left-right order, consistent
with the port sequence number on the device.
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Meaning
Example
R: Receiving
interface
T: optical
transmitting
interface
Example of the Label
Figure 5-89 shows a sample label on an optical fiber.
Figure 5-89 Sample label on an optical fiber between two devices
05
01
01
01
TO:
G01
01
01
A01
The meaning of the label is listed in Figure 5-89.

"A01-01-05-01-R" indicates that the local end of the optical fiber is connected to the
optical receiving interface 01 in slot 5, chassis 01 in the cabinet in row A, column 01 in
the machine room.

"G01-01-01-01-T" indicates that the opposite end of the optical fiber is connected with
optical transmitting interface 01 in slot 01, chassis 01 in the cabinet in row G, column 01
in the machine room.
Labels for the Optical Fibers Connecting the Device and an ODF
Meaning of the Labels
Table 5-23 shows information on both sides of labels attached to an optical fiber between a
device and an optical distribution frame (ODF).
Table 5-23 Information on labels affixed to a fiber between a device and an ODF
Content
Meaning
Example
MN-B-C-D-R
/T
MN: cabinet
number
For example, A01.
B: chassis
number
Numbered in bottom-up order with two digits, for
example, 01.
C: physical slot
number
Numbered in top-down and left-right order starting
from 01. For example, 01 is the first slot at the top left
of the chassis.
D: optical
Numbered in top-down and left-right order, consistent
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Meaning
Example
interface
number.
with the port sequence number on the device.
R: Optical
receiving
interface
T: optical
transmitting
interface
ODF-MN-BC-R/T
MN: row
number and
column number
of an ODF
M: The cabinet rows from front to back are numbered
from A to Z.
N: The cabinet columns from left to right are
numbered from 01 to 99.
For example, G01 is the ODF of row G and column
01.
B: row number
of the terminal
device
Range from 01 to 99, for example, 01-01.
C: column
number of the
terminal device
R: Optical
receiving
interface
T: optical
transmitting
interface
Example of the Label
Figure 5-90 shows a sample label on an optical fiber.
Figure 5-90 Sample label on an optical fiber between the device and the ODF
01
01
01
TO:
A01
ODF G01
05
01
Meaning of the label in Figure 5-90

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"ODF-G01-01-01-R" indicates that the local end of the optical fiber is connected to the
optical receiving terminal in row 01, column 01 of the ODF in row G, column 01 in the
machine room.
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
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"A01-01-05-01-R" indicates that the opposite end of the optical fiber is connected to
optical receiving interface 1 in slot 05, chassis 01 in the cabinet in row A, column 01 in
the machine room.
5.4.3 Engineering Labels for Network Cables
Applicable Ranges
The labels can be applied to Ethernet cables.
Label Content
Table 5-24 shows the information on both sides of the labels affixed to Ethernet cables.
You can also decide the label content based on the actual environment. If the device is not
installed in the cabinet, for example, you can remove the cabinet number.
Table 5-24 Information on the Ethernet cables
Content
Meaning
Example
MN-B-C-D
MN: cabinet
number
For example, A01 is the first cabinet in row A.
B: chassis
number
Numbered in bottom-up order with two digits, for
example, 01.
C: physical slot
number
Numbered with two digits in top-down and
left-right order. For example, 01.
D: network port
number
Numbered in top-down and left-right orders. For
example, 01.
MN: cabinet
number
For example, B02 is the second cabinet in row B.
Z: Location
number
Fill in the location number of the terminal device
on site. If the cable is connected to a device in a
cabinet, specify the serial numbers of the cabinet,
the chassis, and the Ethernet interface of the device.
For example, B02-03-12. If the cable is connected
to the Network Management Station (NMS),
specify the specific location of the NMS.
MN-Z
The contents of the labels for network cables connecting hubs and devices or agents and the
network cables for other purposes should be specified according to actual connections. The
details are as follows:

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For a network cable connecting a hub and device, the label on the hub end should
indicate the numbers of the chassis and cabinet where the hub resides, and the serial
number on the hub. The label on the device end should indicate the number of the
chassis and cabinet where the device is located. If the device is a standalone device,
provide the specific position of the device.
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
For a network cable connecting a hub and an agent or terminal, the label on the agent or
terminal end should contain the serial number of the network interface. The definitions
of the cabinet number and chassis number are the same as those described in Table 5-24.

If the hub is a standalone device without a cabinet or chassis, the label should contain
specific location information that identifies the hub.
The serial number on the hub, the network interface number of the agent or terminal, and the
location of the standalone device should be specified according to actual connections.
Label Example
Figure 5-91 shows a sample label on an Ethernet cable.
Figure 5-91 Sample label on an Ethernet cable
01
01
03
03
TO:
B02
A01
01
Meaning of the label in Figure 5-91.

"A01-03-01-01" indicates that one end of the network cable is connected to network
interface 01 in slot 01, chassis 03 of the cabinet in row A, column 01 in the equipment
room.

"B02-03-01" indicates that another end of the network cable is connected to network
interface 01 in chassis 03 of the cabinet on row B, column 02 in the equipment room. No
slot number is given.
5.4.4 Engineering Labels for User Cables
Attach labels to both ends of a user cable to indicate the locations of the cable on the device
and main distribution frame (MDF).
Meaning of the Engineering Labels for User Cables
Table 5-25 shows the contents of the labels.
Table 5-25 Contents of the engineering labels for user cables
Content
Meaning
Example
MN-B-C-D
MN: cabinet
number
For example, A01 is the first cabinet in row A.
B: frame number
Numbered in the bottom-up order with two digits,
for example, 03.
C: physical slot
number
Numbered with two digits in top-down and
left-right order. For example, 01.
D: cable number
Numbered with two digits in top-down and
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Meaning
5 Appendix
Example
left-right order. For example, 01.
MDF-MN-B-C
MN: row number
and column
number of the
MDF
M: The rows of cabinets from front to back are
numbered from A to Z. N: The columns of cabinets
from left to right are numbered from 01 to 99. For
example, G01 is the MDF of Row G and Column
01.
B: row number of
the terminal
device
Ranges from 01 to 99, for example, 01-01.
C: column number
of the terminal
device
Example of the Label
Figure 5-92 shows a sample label on a user cable.
Figure 5-92 Sample label on a user cable
03
01
01
TO:
MDF G01
01
A01
01
The meaning of the label in Figure 5-92 is as follows:

"A01-03-01-01" indicates that the local end of the user cable is connected to port 1 in
slot 1, chassis 03 of the cabinet in row A, column 01 in the equipment room.

"MDF-G01-01-01" indicates that the opposite end of the user cable is connected to the
terminal in row 01, column 01 of the MDF in row G, column 01 in the equipment room.
5.4.5 Engineering Labels for Power Cables
Engineering Labels for DC Power Cables
These labels are affixed to the DC power cables that provide power supply for cabinets,
including the -48 V, PGND, and BGND cables. Here, the DC power cables also include power
cables and PGND cables.
The labels for DC power cables are affixed to one side of the identification plates on cable ties.
For details of the labels, see Table 5-26.
Table 5-26 Contents of the label
Content
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Meaning
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Meaning
MN(BC)-B--48V
MN(BC): BC is written right under MN.
MN(BC)-B-BGN
MN(BC)-B-PGN
5 Appendix
B: chassis number, numbered in bottom-up order with two digits, for
example, 01.
N: power socket number, numbered as 1 to 3 in the bottom-up and
left-to-right orders.
On the loaded cabinet side, only MN is used to identify the cabinet.
On the power cabinet side, MN identifies the row and column number
of the power distribution equipment like a control cabinet and
distribution box, and BC identifies the row and column number of the
-48 V connector. If there is no row number or column number, or the
connector can be identified without them, BC can be omitted. It is
unnecessary to identify the row and column number for BGND and
PGND.
The label only carries location information about the destination direction of the power cable
whereas information about the local end is unnecessary. That is, the label only carries location
information about the opposite equipment, the control cabinet, or the distribution box. Table
5-26 lists the information on two -48 V power supplies on the label. The information on other
DC voltages, such as 24 V and 60 V should be given in similar methods.
Make sure that labels are affixed in the correct direction. That is, after the cable ties are
bundled onto the cable, the identification plates with the labels should face up, and the text on
the labels in the same cabinet should be in the same direction. For details, see Figure 5-93.
Figure 5-93 Example of the labels for DC power cables
The meaning of the label in Figure 5-93 is as follows:

On the loaded cabinet side, the label "A01/B08--48V2" on the cable indicates that the
cable is -48 V DC supply, which is from the eighth connector in row B of -48 V bus bar
in the cabinet in row A, and column 1 in the equipment room.

On the distribution box side, the label "B03--48V2" indicates that the cable is -48 V DC
supply, connected to DC power socket 2 in row B, column 03 in the equipment room.
In the power distribution box or the first power cabinet of a row in a transmission equipment room,
every terminal block on the -48 V connector bar has a numeric identification. For example, in the above
label of "A01/B08--48V2", "08" (or sometimes "8") is the numeric identification of the terminal block.
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PGND and BGND are two copper bars, on which the terminal blocks are short-circuited.
Therefore, it makes no difference which terminal is connected to them. It is only necessary to
give the row and column of the power distribution box, instead of giving the specific serial
number of the terminal block on the copper bar. For example, if the label on the loaded
cabinet side is "A01-BGND", it means that the power cable is a BGND that connects BGND
copper bar in the power distribution box in row A, column 01 in the machine room.
Information on the labels for PGND cables should be given in a similar way.
Engineering Labels for AC Power Cables
These labels are affixed to both ends of an AC power cable that provides AC power supply to
cabinets, including 110/220 V, PGND, and BGND cables. The 110/220 V AC cables and
related PGND and BGND cables are covered with an insulating sheath, so the labels need to
contain only the word "AC" and the cabinet numbers.
The labels for AC power cables are affixed to one side of the identification plates on cable ties.
For details, see Table 5-27.
Table 5-27 Label content
Content
Meaning
MN-(B)-ACn
MN: serial number of the cabinet or the socket where the power is led
in
B: chassis number, numbered in bottom-up order with two digits, for
example, 01.
n: power port number, numbered as 1 to 3 in bottom-up and
left-to-right order.
Serial number of the socket where the power is led in: the location of
the socket is marked according to the actual situation. If the sockets can
be identified by row numbers and column numbers, they can be
numbered following the same rule for the cabinets. If the sockets
cannot be identified by rows and columns, specify the detailed
locations to avoid confusion with other sockets.
The label only carries location information about the opposite equipment and the power
socket; information about the local end is unnecessary.
Make sure that labels are affixed in the correct direction. That is, after the cable ties are
bundled onto the cable, the identification plates with the labels should face up, and the text on
the labels in the same cabinet should be in the same direction, as shown in Figure 5-94.
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Figure 5-94 Labels for AC power cables
Meaning of the label in Figure 5-94.

On the equipment cabinet side, the label marked "A01-AC1" indicates that the power
cable is connected to the first AC power socket of row A and column 01 in the equipment
room.

On the power socket side, the label marked "B01-AC1" indicates that the power cable is
connected to the first AC power socket in the cabinet of row B and column 01 in the
equipment room.
5.5 Guide to Using Optical Modules
Common Faults of an Optical Module
The system may fail to obtain information about non-Huawei-certified optical modules or obtain
incorrect information. You are advised to use Huawei-certified optical modules. Obtain the electronic
label of the optical module and contact technical support personnel to confirm whether it is a
Huawei-certified optical module.
1.
An optical module is not completely installed in position.
If the optical module is not completely installed in position and the latch boss is not
secured, the device cannot identify the optical module. After the optical module works
for a long time, it will be ejected under external stress.
2.
The optical receptacle on an optical module is contaminated.
If an optical module is not cleaned or protected properly, contaminants may accumulate
on the fiber pin in the optical module. As a result, the coupling efficiency is reduced,
optical signals are cut off, or even worse, the surface of the fiber pin is damaged
permanently.
3.
An optical module is burnt.
If high-power optical signals (caused by an optical time domain reflectometer or
self-loop test) are transmitted through an optical module that is used for long-distance
transmission but no optical attenuator is used, the optical power will exceed the overload
power of the avalanche photodiode (APD). Then the optical module is burnt.
The preceding faults lead to temporary or long-term cut-off of optical signals; or even cause
permanent damages to the optical module, affecting communication services.
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Measures to Prevent a Loosened Optical Module
1.
When installing an optical module, insert it in position. If you hear a click or feel a slight
shake, it indicates that the latch boss is secured.
If the latch boss is not secured, the gold finger of the optical module is not in good
contact with the connector on the board. In this case, the link may be connected but
optical signals will be cut off or the optical module will be loosened when the optical
module is shaken or hit.
2.
Figure 5-95 shows the release handle on an optical module when it is open and closed.
When inserting the optical module, make sure that the release handle is closed. At this
time, the latch boss locks the optical module. After the optical module is inserted, try
pulling it out to see if it is installed in position. If the optical module cannot be pulled out,
it is secured.
Figure 5-95 State of the release handle
Close the release handle
Open the release handle
Measures to Prevent Receptacle Contamination
1.
Cleaning tissues must be prepared on site. You need to clean the optical connector before
inserting it in the receptacle. This protects the receptacle against contamination on the
surface of the optical connector.
Figure 5-96 Cleaning optical fibers with special cleaning tissues
Place at least three cleaning tissues on the work bench. As shown in Figure 5-96, wipe the end of an
optical connector from left to right or from right to left on a cleaning tissue, and then move the
connector end to the unused part of the cleaning tissue to continue.
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2.
5 Appendix
Cover an unused optical module with a protective cap to prevent dust, as shown in
Figure 5-97.
Figure 5-97 Installing a protective cap
If no protective cap is available, use fibers to protect the optical module, as shown in
Figure 5-98.
Figure 5-98 Using fibers to protect an optical module
3.
Cover unused optical connectors with protective caps, as shown in Figure 5-99, and then
lay out fibers on the fiber rack or coil them in a fiber management tray to prevent fibers
from being squeezed.
Figure 5-99 Installing a protective cap on a fiber
4.
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If a receptacle or an optical connector has not been used for a long time and is not
covered with a protective cap, you need to clean it before using it. Clean a receptacle
with a cotton swab, as shown in Figure 5-100. Clean an optical connector with cleaning
tissues.
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Figure 5-100 Cleaning a receptacle with a cotton swab
When cleaning a receptacle, insert the cotton swab and turn it slowly in the receptacle. Do not
use too much strength because the receptacle may be damaged.
5.
If optical signals are lost during the operation of a device, use the preceding method to
clean the receptacle or the optical connector. In this manner, the possibility of
contamination can be excluded.
Measures to Prevent an Optical Module from Being Burnt
1.
Before using an optical time-domain reflectometer (OTDR) to test the connectivity or the
attenuation of optical signals, disconnect the optical fibers from the optical module.
Otherwise, the optical module will be burnt.
2.
When performing a self-loop test, use an optical attenuator. Do not loosen the optical
connector instead of the optical attenuator.
1.
The optical connector should be vertically inserted in the receptacle to avoid damages to
the receptacle.
2.
Fibers must be inserted into optical modules of the corresponding type. That is,
multimode fibers must be inserted into multimode optical modules, and single mode
fibers must be inserted into single mode optical modules. If a fiber is inserted into an
optical module of a different mode, faults may occur. For example, optical signals will
be lost.
Precautions
5.6 Fault Tag
*Customer name:
Address:
Contact person:
Tel.:
Category*:
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Fax:
□
RMA □ Return □ Analysis
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BOM
Code
Product
Description
5 Appendix
Bar
Code*
Fault
Occurring
Date*
Description
of the Fault
Phenomena*
Category
No.*
Software
Version*
Reasons for Repairing (Category No.):
Category No. includes the following eight types:
F001 - Wear out damaged (◊ In warranty Period ◊ Out of warranty period)
F002 - Deployment damaged
F003 - Intransit damaged
F004 - Version upgrade
F005 - Batch replace
F007 - Overdue spare parts inspecting
F008 - Others
F011 - Running circumstance change
Note:

For optical interface cards returned, the optical interfaces should be covered with
protection caps.

In general, the analysis card will not be returned to you. If you have any special
requirements, please contact Huawei.

One Fault Tag should be adapted in one return category, such as
RMA/Return/Analysis.

The items marked with "*" are the mandatory fields that you must fill in.
5.7 Installation Checklist
Com
pone
nt
AC
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No.
Applic
able
Scope
Check Item
Indepen
dent AC
The air vent of the device is free from blockage to ensure
normal heat dissipation.
Indepen
The power modules are securely installed with their captive
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Com
pone
nt
PoE
power
supply
Applic
able
Scope
Check Item
dent AC
screws tightly fixed.
Indepen
dent AC
Four rubber pads are attached to specified positions on the
bottom of the AC before it is placed on a desk.
Indepen
dent AC
The AC is secured in the cabinet or rack by rack-mounting
brackets or guide rails (or trays), and floating nuts are
correctly secured.
AC card
The AC card is secured in the cabinet or rack by guide rails
or trays, and the guide rails or trays and floating nuts are
correctly secured.
AC card
The AC card is correctly inserted into the device slot and
secured using the ejector lever.
AC card
No pins on the backplane are bent when the AC card is
installed.
Indepen
dent AC
The AC is grounded using a ground cable, meeting surge
protection requirements.
Indepen
dent AC
When the AC directly connects to APs, location IDs of the
APs are provided at the cable connection points.
General
The proper PoE switch or power adapter is selected, meeting
AP power supply and onsite environment requirements.
General
To ensure that the PoE power meets requirements, the PoE
power supply device and APs must be connected through
CAT5E and CAT6E network cables, and the cable length
cannot exceed 100 m.
General
Labels must be made for the PoE power cable to identify AP
locations.
General
Leave a 20 cm space between PoE power adapters to ensure
normal heat dissipation.
General
The PoE switch is correctly grounded with the ground cable.
General
Reserve a few downlink network interfaces for the PoE
switch (for example, connect at most 20 APs to a 24-port
switch) for future capacity expansion.
General
You are advised to configure dual power modules for a PoE
switch for power redundancy backup and providing power
for more APs.
General
The AP installation positions comply with the network
planning report and APs cannot be installed in environments
with strong electrical or magnetic interference or corrosive
materials. If the onsite environment does not meet
requirements, adjust the AP installation positions properly.
No.
AP
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Com
pone
nt
No.
Applic
able
Scope
Check Item
General
The devices are installed correctly, securely, without
damages or paint peeling. Screws are tightened.
General
Leave at least 20 cm space at the cable outlet and top
(convex) of the AP to facilitate commissioning, maintenance,
and heat dissipation. APs that dissipate heat from the rear
must be fixed using mounting brackets in wall mounting
scenarios. Ensure that there is a certain space between the
APs and wall to facilitate heat dissipation.
General
APs with built-in antennas should be installed in open areas
and there should be no obvious obstruction in the coverage
direction of the main lobe. The main lobe of built-in antennas
faces the top (convex).
General
The APs and antennas are neatly installed, without affecting
the overall layout of the environment.
Indoor
AP
Indoor APs are placed far away from windows and in dry
environments with little dust and good ventilation. There
should be no inflammable materials in rooms. The indoor
temperature and humidity must be within acceptable ranges.
Indoor
AP
When being mounted to a ceiling, the APs must be fixed
using the matching mounting brackets. The APs cannot be
hung in the air or placed directly on the ceiling. When the
APs are mounted to a wall, the bottom of the APs should be
at least 30 mm from the ground. The APs should be installed
in places out of reach of people.
Outdoor
AP
When two or more APs are installed in the same area, they
must be installed in the same vertical or horizontal line with
certain spacing greater than 15 mm.
General
Dustproof, waterproof, and anti-theft measures are taken and
the devices are kept clean. The APs are secured using the
security locks (separately purchased) based on onsite
situations and customer requirements. If APs are placed in a
network box, ensure that the box is well-ventilated, clean,
and dustless, and the ventilation holes are not blocked.
10
Indoor
AP
Indoor APs should be mounted on walls with network ports
downwards to prevent device damages caused by water drops
or other liquid. Install the device in a site that is free from
leaking or dripping water, heavy dew, and humidity, and take
protective measures to prevent water from flowing into the
equipment along the cable.
11
Outdoor
AP
When an outdoor AP is installed against a wall or pole, keep
the indicator downwards for easy observation.
12
General
Use waterproof labels to mark the registration names of APs
on the AC, as well as their channels and IP addresses. The
lables should be attached to the front of the APs for easy
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observation.
Signal
cable
13
General
Record AP installation positions, MAC addresses, interfaces
of uplink PoE switches, and IP addresses (APs use fixed IP
addresses) into a table.
14
Indoor
AP
The devices required during indoor AP installation, such as
the splitter, coupler, and antennas are operated in accordance
with specifications.
15
General
The APs using a metal shell (with a ground point) must be
properly grounded.
16
Outdoor
AP
Unused radio ports should be installed with 50 Ω RF loads.
17
Outdoor
AP
Take lightning protection measures on outdoor APs (the
outdoor APs have built-in 5 kV surge protectors. If
customers require a higher surge protection capability on the
feeder ports, they can purchase additional surge protective
devices, which need to be separately grounded). The APs
should be located in the protection scope (within a 45-degree
angle) of a lightning rod.
18
Outdoor
AP
When an AP is mounted to a pole, the distance between the
AP and the top of pole should be at least 30 cm.
General
Routes of signal cables comply with the engineering design
document. The signal cables are correctly connected to
facilitate maintenance and capacity expansion.
General
Radio ports of an AP are correctly connected to radio ports
A/B/C of antennas.
General
Signal cable connectors are correctly installed and securely
connected to the device. Wires of each signal cable are
securely cramped in the connectors and pass connectivity
tests.
General
Signal cables are orderly routed and not crossed, twisted, or
winded (cables can be crossed at 1 m out of the cabinet). The
bend radius of cables meets requirements, and the cables are
not excessively bent.
General
Signal cables are not damaged or broken and have no splices.
Sufficient cable length is reserved. The reserved cables are
twined and placed properly to facilitate subsequent
maintenance.
Indoor
AP
The optical, power, network, and feeder cables are bundled
using straps (one strap every 0.5 m) and securely fastened.
Outdoor
AP
The signal cables shall be bundled at even intervals (about
1000 mm), not too tight or too loose. The cables shall be
bundled properly with cable ties placed in neat order. Cut off
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redundant cable ties and remove burrs from them to avoid
injuries. The cables shall be fixed using fasteners or
ageing-resistant outdoor metal binding straps.
General
Keep the signal cables away from heat sources and use heat
insulation materials to insulate the cables from the heat
sources. Do not place signal cables on the air vents of the
cabinet to avoid affecting subrack heat dissipation or cable
lifetime.
Pigtail layout should meet the following requirements:
Pigtails are not strained or twisted at the bent parts. They
are bundled by binding tape with appropriate force.

Pigtails can be pulled back and forth easily inside the
cable tie and are not bent at a right angle.

Pigtails are not squeezed by other cables or objects.

The flange must be fixed.

Pigtails are protected with protective tubes or enveloped
in troughs when they are routed outside the cabinet. The
protective tubes are bundled and processed to prevent
cutting.

The optical fiber cannot be folded or twisted, and the
pigtail cannot be squeezed. The binding diameter of an
optical fiber must be larger than 6 cm.

The pigtail connection points must be clean and dustless.
Fiber connectors and optical ports that are not used must
be protected with protective caps or plugs. Cleaning must
be carried out in strict accordance with Huawei tool
specifications.
General
10
General
The feeder cables shall not be bent or twisted, with no copper
wire exposed.
11
General
The feeder cable connectors comply with corresponding
standards and are correctly connected, without looseness.
12
General
The feeder cables, power splitter, coupler, and surge
protective devices are connected correctly and reliably in
accordance with specifications.
General
Strong current and weak current cables are routed separately.
The power cables, ground cables, and signal cables are
bundled and routed separately (with a spacing of more than
30 mm) to prevent electrical or magnetic interference. Use
shielded cables in places with strong interference.
General
When routing cables in walls, place the cables in the cable
troughs or pipes and fix the cables using pipe straps. For
non-metal corrugated pipes, the fixing distance should be
about 1000 mm.
13
14
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Outdoor
AP
All outdoor connectors or feeder cable connectors are
properly sealed to prevent water. Wrap the cable using
one-layer PVC insulation tape, three-layer waterproof tape,
and then three-layer PVC insulation tape. The tape shall be
attached evenly and neatly. The network cables shall be
covered with waterproof PG tubes.
16
Outdoor
AP
Cable connectors are secured on cables and sealed to prevent
water intrusion. The outlets of cable conduits on a wall are
sealed by waterproof and flame-retardant materials. Drip
loops meeting the minimum bending radius requirement are
made on the network cable segment that stretches indoor.
17
Outdoor
AP
Do not deploy cables overhead between two buildings.
18
General
Waterproof labels (providing device names and cable
directions) are filled and attached to signal cables correctly.
Each label is attached 20 mm to 100 mm from the
corresponding cable connector.
19
Outdoor
AP
Surge protection measures are taken in the places where the
outdoor APs are installed. The outdoor APs, antennas, and
signal cables are deployed within 45-degree protection area
of a lightning rod.
20
Outdoor
AP
The bare wires of network and feeder cables should be
covered by the winding pipes, flexible metal conduit, PVC
pipes, or galvanization pipes. The cable outlet and inlet are
sealed to prevent dusts.
General
The installation positions of antennas should comply with the
engineering design and antennas should be securely and
reliably installed.
General
There should be no obstacles in the major coverage direction
of antennas. The direction and downlink tilt of antennas
should be adjusted based on the coverage targets.
General
There should not be metal subjects within 1 m around an
outdoor omnidirectional antenna.
General
The azimuth deviation of a directional antenna should be
within 5 degrees and the tilt deviation within 0.5 degree.
Outdoor
antenna
The antennas are fixed using special support that supports
installation of surge protection devices and shall be located
within a 45 degree protection angle of a lightning rod. When
an antenna is mounted to a pole, the distance between the
antenna and top of the pole should be at least 30 cm.
Outdoor
antenna
Take waterproof measures on connectors of the antennas and
feeder cables and keep the drain holes of antennas
downwards.
No.
15
Anten
na
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The pole used in antenna mounting should meet the
following requirements:
Pole height: ≥ 2000 mm
Outdoor
antenna
Bottom pole diameter: ≥ 220 mm
Top pole diameter: ≥ 120 mm
Pole thickness: ≥ 6 mm
Depth of foundation: ≥ 1500 mm
The pole deployed outdoors must be reinforced with hot-dip
zinc to prevent water corrosion and rust.
It is recommended that at most three APs or antennas be
mounted to the same pole. The APs or antennas mounted to
the same pole should meet the following requirements:
10
Outdoor
antenna
Outdoor
antenna
Outdoor
antenna

The vertical distance should be at least 3.5 m between
adjacent 2.4G antennas and 2 m between adjacent 5G
antennas.

There should be at least 1 m vertical distance between
antennas that work on the same frequency band and
belong to different APs.
When outdoor APs use single-polarized antennas, the
horizontal distance between 2.4G antennas should be at least
1 m and that between 5G antennas should be at least 0.5 m.
If multiple APs are mounted to different poles, the APs
should provide signal coverage in the same direction or in
back-to-back mode to ensure that main lobe of antennas on
different APs do not face each other.
Recommended AP distance:
≥ 44 m (APs provide signal coverage in the same direction)
≥ 6 m (APs provide distance in back-to-back mode)
Power
and
groun
cables
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General
The female connectors of power cables connecting to the
device are fixed using a locking latch.
General
The power cables and ground cables are correctly connected.
General
The power cables and ground cables are complete and not
spliced.
General
The excess of power cables or ground cables are trimmed off
without any coils. The power cables connecting the delivered
surge protection boxes and devices cannot be cut. These
power cables can be coiled.
General
Power cables and ground cable are separated from the signal
cables.
General
Power cables and ground cables are routed straightly and
properly bundled, with sufficient slack at the bend part. If the
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cables are fixed on a sharp mechanical part, take protection
measures.
Optica
modul
General
The equipotential cables between the attaching cabinets shall
be securely connected.
General
The lugs for the power cables and ground cables are soldered
or crimped securely.
General
The lugs and bare wires of power cables and ground cables
are tightly wrapped with tubes or insulation tape without any
exposed copper wire. Flat washers and spring washers are
installed correctly.
10
General
Labels are filled and attached to power cables and ground
cables correctly.
11
General
Power cables deployed outdoors must be covered by PVC
tubes.
General
A single-mode fiber can only be used with a single-mode
optical module while a multimode optical fiber can only be
used with a multimode optical module. On most optical
modules, the fibers of different types cannot be used
together.
General
The labels of pluggable optical modules are smoothly
attached and intact, and cannot be covered by the optical
modules.
General
If a short-distance optical fiber is used for a long-distance
optical module, especially in loopback scenarios, use an
optical attenuator to prevent the optical module from being
burnt.
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