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and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.
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holders.
Notice
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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
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Website:http://www.huawei.com
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Hardware Installation and Maintenance Guide
Intended Audience
This document describes hardware features of the AP6050DN and AP6150DN and provides
basic installation methods.
This document is intended for:
lNetwork planning engineers
About This Document
About This Document
lHardware installation engineers
lCommissioning engineers
lOnsite maintenance engineers
lSystem 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.
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2 AP Installation............................................................................................................................... 7
2.1 Preparing for Installation................................................................................................................................................ 8
2.3 Unpacking the Equipment............................................................................................................................................ 10
2.4 Determining the Installation Position........................................................................................................................... 11
2.5 Installing the AP........................................................................................................................................................... 12
2.5.1 Installing the Device on a Wall..................................................................................................................................12
2.5.2 Installing the device on a Ceiling.............................................................................................................................. 13
2.5.3 Installing the device on a T-rail................................................................................................................................. 14
2.7 Connecting the Security Lock...................................................................................................................................... 18
2.8 Checking the Device After Installation........................................................................................................................ 18
2.9 Powering on the AP......................................................................................................................................................19
3 Logging In to the Device............................................................................................................ 20
3.1 Logging In to the Device Using STelnet/Telnet........................................................................................................... 21
3.2 Logging In to the Device Through the Web System (Applicable to the Fat AP Only)................................................ 22
3.3 Logging In to the Device Through the Console Port....................................................................................................22
4.1 A Device Fails to Be Powered On................................................................................................................................25
5.1.2 Assembling Power Cables......................................................................................................................................... 29
AP6050DN & AP6150DN
Hardware Installation and Maintenance GuideContents
5.1.5 Replacing the Mold of the Crimping Tool.................................................................................................................67
5.2 Environmental Requirements for Device Operation.................................................................................................... 70
5.2.1 Environmental Requirements for an Equipment Room............................................................................................ 70
5.2.2 Requirements for Power Supply................................................................................................................................78
5.3.1 General Grounding Specifications.............................................................................................................................81
5.3.2 Grounding Specifications for an Equipment Room.................................................................................................. 81
5.3.3 Grounding Specifications for Devices.......................................................................................................................81
5.3.4 Grounding Specifications for Communications Power Supply.................................................................................82
5.3.5 Grounding Specifications for Signal Cables............................................................................................................. 83
5.3.6 Specifications for Laying Out Grounding Cables..................................................................................................... 83
5.4 Engineering Labels for Cables..................................................................................................................................... 84
5.4.1 Introduction to Labels................................................................................................................................................84
5.4.2 Engineering Labels for Optical Fibers.......................................................................................................................92
5.4.3 Engineering Labels for Network Cables................................................................................................................... 95
5.4.4 Engineering Labels for User Cables..........................................................................................................................96
5.4.5 Engineering Labels for Power Cables....................................................................................................................... 97
5.5 Guide to Using Optical Modules................................................................................................................................ 100
AP6050DN & AP6150DN
Hardware Installation and Maintenance Guide
About This Chapter
1 Product Overview
1 Product Overview
The AP6050DN and AP6150DN support MU-MIMO (4SU-3MU), provide comprehensive
service support capabilities, and feature high reliability, high security, simple network
deployment, automatic AC discovery and configuration, as well as real-time management and
maintenance, which meet network deployment requirements. The APs comply with the
802.11ac Wave2 protocol and can provide up to 2.53 Gbit/s theoretical bandwidth for wireless
users, greatly improving user experience.
The AP6050DN and AP6150DN are applicable to mobile office, high-density, elementary
education, and higher education scenarios for providing high-performance wireless services
for users. The APs can be deployed flexibly based on site environments.
1.1 Device Structure
1.2 Indicator Description
1.3 Basic Specifications
1.4 Ordering Information
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Table 1-3 Indicator description
TypeColorStatusDescription
1 Product Overview
Default status after
GreenSteady onThe AP is just
power-on
Software startup
status
GreenSteady on after
blinking once
Running statusGreenBlinking once every
2s (0.5 Hz)
powered on and the
software is not
started yet.
After the system is
reset and starts
loading the software,
the indicator blinks
green once. Until the
software is loaded
and started, the
indicator remains
steady green.
l The system is
running properly,
the Ethernet
connection is
normal, and
STAs are
associated with
the AP.
l The system
enters the Uboot
CLI.
Blinking once every
5s (0.2 Hz)
The system is
running properly, the
Ethernet connection
is normal, and no
STA is associated
with the AP. The
system is in low
power consumption
state.
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TypeColorStatusDescription
1 Product Overview
AlarmGreenBlinking once every
0.25s (4 Hz)
Fault
RedSteady onA fault that affects
l The software is
being upgraded.
l After the
software is
loaded 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).
l The AP fails to
go online on the
AC (the
CAPWAP link
disconnects).
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 1-4 provides basic specifications of the AP6050DN and AP6150DN.
Table 1-4 Basic specifications
Item
Technical
specifications
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2.1 Preparing for Installation
This section describes safety precautions and tool preparations for AP installation.
Safety Precautions
lTake proper measures to prevent injuries and device damage.
lPlace the device in a dry and flat position away from any liquid and prevent the device
from slipping.
lKeep the device clean.
lDo not put the device and tools in the aisles.
CAUTION
Only the qualified personnel are permitted to install and remove the device and its
accessories. Before installation and operation, read the safety precautions carefully.
2 AP Installation
Tool Preparation
To install APs, prepare tools listed in Table 2-1.
Table 2-1 Tools
Phillips screwdriver
Slip-proof gloveMarkerHammer drill
Claw hammerDiagonal pliersWire stripper
Protective glovesESD gloves
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Figure 2-1 Installation flowchart
2 AP Installation
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.
lAP device
lAntennas
lSheet metal mounting bracket
lOT terminal
lAdjustable buckle
lExpansion screws
lQuick start guide
lWarranty card
lMAC address label
lSN label
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NOTE
l If a PoE adapter or a DC power adapter is required, you need to purchase it separately.
l Antennas are provided only in the carton of the AP6150DN.
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
2 AP Installation
When determining the AP installation position, comply with the following rules:
lTry to reduce the number of obstacles, such as walls, between the AP and user terminals.
lPlace 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.
lInstall the AP in a hidden position that does not affect daily lives and work of residents.
lInstall 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.
lDo 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.
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Table 2-2 General anti-interference requirements
ScenarioDeployment Distance Requirement
2 AP Installation
Indoor
installation
l There should be at least a 7 m distance between antennas.
l The antennas should be placed at least 2 m from the 4G antennas of
the carrier.
l The antennas should be placed far away from electronic devices that
may produce interference, such as microwave ovens.
NOTE
If antennas are embedded into APs, the deployment distance requirements on the antennas are those on APs.
2.5 Installing the AP
NOTE
l Remove the protective film on the surface before installation to prevent electrostatic discharge.
l The installation of the AP6150DN is used as an example.
2.5.1 Installing the Device on a Wall
Mounting APs on a wall requires sheet metal mounting brackets and expansion screws. The
procedures are as follows:
1.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.
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.
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3.Fix the mounting bracket to the wall and use the Phillips screwdriver to fasten three
expansion screws into the expansion tubes.
2 AP Installation
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.
2.5.2 Installing the device on a Ceiling
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.
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1. Ceiling tile2. Adjustable buckle3. M4x30 screw
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.
2 AP Installation
NOTE
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.
2.5.3 Installing the device on a T-rail
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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.
2 AP Installation
NOTE
lBefore fixing the adjustable buckle with a screw, you need to adjust the buckle to a proper position
based on the T-rail width.
lEnsure that the AP is correctly installed on the mounting bracket and there must be 200 mm space
above and around the AP for maintenance.
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2.6 Cable Connection
Table 2-3 describes cable connections (the AP6150DN is used as an example).
Figure 2-3 Appearance of the AP6150DN
2 AP Installation
Table 2-3 Cable connections
No.
1USB flash driveConnects to a USB flash drive to extend the storage space
2Ground cableConnects the AP to the ground.
3Network cable
4DC power adapterWhen the AP uses the DC power supply, use a power
Cable or DeviceDescription
of the AP, and provides a maximum of 2.5 W power.
l CAT5e cables or higher must be used.
l The service network cable and PoE input cable cannot
be connected to the console port. Otherwise, the AP
may be damaged when using PoE power supply. The
network cable length cannot exceed 100 m.
l 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.
adapter for power supply; otherwise, the AP may be
damaged.
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No.Cable or DeviceDescription
5AntennaConnects to an external antenna for transmitting and
NOTE
l The AP is powered by either the DC power supply or PoE power supply that backs up each other.
l By default, the USB port is disabled. You can enable it using the web platform or CLI. For details, see the
configuration guide in the AC product documentation.
Pay attention to the following points when bundling the cables:
lDifferent 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.
lBundled cables are closely arranged, straight, tidy, and undamaged.
lCable 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.
lLabels or nameplates must be attached to the cables after they are installed.
2 AP Installation
receiving service signals. Only the AP6150DN provides
antenna ports for connecting external antennas.
Connecting Antennas
Connect the antennas delivered in the installation accessory package of the AP to the RF ports
on the AP, tighten the nuts (with a torque of 0.8 N•m), and adjust antenna angles as required.
Connecting the Ground Cable
Use ground screws and ground cables to ground the AP. The ground cables need to be
prepared on site. The M4 OT terminal is used to connect to the AP and M6 OT terminals to
the ground bar. The type of OT terminals can also be determined according to site surveys.
Cut the cable into the required length according to site conditions.
Tighten the OT terminal for the AP with a torque of 3 N•m. The tightening torque for the
ground bar varies according to the OT terminals used.
lM4: 1.4 N•m
lM6: 4.8 N•m
lM8: 12 N•m
Ground cable deployment requirements are as follows:
lThe ground cables must be connected to a group of ground bars.
lThe bend radius of the ground cables must be larger than or equal to five times the cable
diameter.
lThe ground cables must be buried underground or routed indoors and cannot be led into
the equipment room aerially.
lBoth ends of the external conductor of the coaxial cable and those of the shield layer of
the shielded cable should have good electric contact with the metal shell of the
equipment they connect to.
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3 Logging In to the Device
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.
NOTE
l By default, only the STelnet V2 service is enabled on the device.
l Telnet has security vulnerabilities. You are not advised to enable the Telnet service.
Before logging in to the device, complete the following tasks:
lPower on the device.
lPrepare 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 nameadmin
Passwordadmin@huawei.com
IP address169.254.1.1
Subnet mask255.255.0.0
NOTE
If a Fit AP 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.
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
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3 Logging In to the Device
3.2 Logging In to the Device Through the Web System
(Applicable to the Fat AP Only)
A Fat AP has a built-in web system. You can use a web browser to log in to the device to
configure, manage, and maintain the device on a graphic user interface (GUI).
Before logging in to the device, complete the following tasks:
lPower on the device.
lPrepare 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 3-2 Default configuration of the device
Parameter
User nameadmin
Passwordadmin@huawei.com
IP address169.254.1.1
Subnet mask255.255.0.0
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 Open the browser on the PC, enter http://IP address in the address box, and press Enter to
log in. Select a language for the web system, enter the default user name and password, and
click Login to enter the web system home page.
Default Setting
----End
3.3 Logging In to the Device Through the Console Port
Before logging in to the device, complete the following tasks:
lPower on the device.
lPrepare a console cable.
lPrepare terminal simulation software.
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NOTE
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:
lBits per second: 9600
lData bits: 8
lParity: None
lStop bits: 1
lFlow control (F): None
Step 3 Press Enter and enter the authentication information as prompted to log in to the user view.
(The following information is only for reference.)
For a Fit AP, enter the default user name admin and password admin@huawei.com.
3 Logging In to the Device
You are advised to change the default user name and password on your first login.
Login authentication
Username:
Password:
Info: You are advised to change the password to ensure security.
For a Fat AP, set a passowrd of console, and use the password to log in.
Please configure the login password:
Info: A plain text password is a string of 8 to 16 case-sensitive characters and
must be a combination of at least two of the follow
ing: uppercase letters A to Z, lowercase letters a to z, digits, and special
characters. A cipher text password contains 56 or 68 ch
aracters.
Enter password:
Confirm password:
----End
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Troubleshooting Procedure
Power Supply ModeTroubleshooting Procedure
Power supply using a power module1. Check whether the device is powered
4 Hardware Failures
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 supply1. 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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Figure 5-2 Stripping a power cable (OT terminal)
5 Appendix
NOTICE
l When you strip a power cable, do not damage the conductor of the cable.
l 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
CrossSectional
Area of
Conductor
(mm2(in.2))
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)
Value of L1
(mm(in.))
Cross-Sectional
Area of Conductor
(mm2(in.2))
Value of L1
(mm(in.))
NOTE
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.
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Figure 5-5 Heating the heat shrink tubing (OT terminal)
NOTICE
5 Appendix
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.
----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
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NOTICE
l When you remove a section of the jacket, do not damage the shield layer of the twisted-
pair cable.
l 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.))
5 Appendix
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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lTo ensure conductivity, the surface of the contact strips must be clean.
lThe contact strips must be in good contact with the RJ45 socket. The plastic separators
must remain intact and be aligned.
lThe 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.
NOTE
All unqualified pieces must be crimped again.
Figure 5-32 Contact strips of different heights
5 Appendix
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.
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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
5 Appendix
Testing the Connection of Assembled Cables
Context
Huawei provides two types of Ethernet cables: straight-through cables and crossover cables.
lStraight-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
22OrangeTwisted
11Orange-White
66GreenTwisted
33Green-White
44BlueTwisted
RJ45 Connector 2Core Wire ColorTwisted or Not
55Blue-White
88BrownTwisted
77Brown-White
lCrossover 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.
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Figure 5-39 Testing the conduction and connections of wires
5 Appendix
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.
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.
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NOTE
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
5 Appendix
----End
5.1.4 Installing Cable Accessories
Precautions for Installing Cable Accessories
Tools
NOTE
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.
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Table 5-9 Bending radius of cables or fibers
Cable or FiberBending Radius (R)
Ordinary cableIn normal cases, R ≥ 2d. When the cable is
FiberR ≥ 40 mm (1.57 in.); Bending angle > 90°
NOTE
The letter d indicates the diameter of a cable or fiber.
Precautions for Installation
lHold terminals of cables instead of pulling the cables themselves when installing or
removing cable components.
lDo 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.
lBefore 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.
lWhen removing densely aligned cables or fiber connectors, use dedicated pliers such as
cable-pulling pliers and fiber-pulling pliers.
lDo not twist, bend, stretch, or extrude fibers during installation.
lCover the idle fiber connectors with dust caps. Remove the dust caps before using the
fiber connectors.
5 Appendix
connected with a connector, R ≥ 5d.
Requirements for Cable Routing
lTo protect cables, remove the burrs in the cable through-holes or install protective rings
in the holes.
lTo 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.
lBind or clean cables gently because cable distortion affects signal quality.
lKeep cables away from moveable components such as doors.
lSharp objects must not touch cable wiring to prevent damage to cables.
lTo protect power cables, route power cables of the active and standby power modules
separately.
Installing Power Adapters
Installing the OT Terminal
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Figure 5-44 Installing two terminals back to back
NOTICE
5 Appendix
Ensure that the OT terminal is not in contact with other terminals or metal
components.
c.Move the cable slightly and ensure that it is securely connected, as shown in Figure
5-45.
Figure 5-45 Installed OT terminal
lInstall 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.
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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
5 Appendix
Step 2 Insert the male connector into the female connector, as shown in Figure 5-51.
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.
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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.
Figure 5-65 Disassembling an LC fiber connector
5 Appendix
----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.
5 Appendix
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 5-77 Mold installed in the COAX crimping tool
Figure 5-78 An installed mold
5 Appendix
----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.
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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.
The specific requirements for selecting a site for an equipment room are as follows:
lThe 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.
lThe 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.
lThe 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.
lThe room should be located far away from industrial and heating boilers.
lThe 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.
lThe doors and windows of the equipment room must be kept closed to maintain an
airtight room.
lUsing steel doors to ensure sound insulation is recommended.
lNo 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, wearresistant, dustproof, flame retardant, sound insulated, heat absorptive, and have
electromagnetic shielding.
lThe 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.
lIt 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.
lThe equipment room should be strong enough to resist winds and downpours.
lThe 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.
lDo not place air conditioning vents near the equipment so that they blow directly on the
equipment because condensation may be blown into the equipment.
lDo not use decorative materials that contain sulfur in the equipment room.
5 Appendix
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
5 Appendix
Construction Requirements for the Equipment Room
The general layout principles of the equipment room are as follows:
lIt should meet requirements for laying out and maintaining communication cables and
power cables.
lIt should reduce the cabling distance, which facilitates cable maintenance, reduces
potential communication faults, and maximizes efficiency.
Table 5-10 describes the construction requirements for the equipment room.
Table 5-10 Construction requirements for the equipment room
Item
Requirements
AreaThe smallest area of the equipment room can accommodate the
equipment with the largest capacity.
Net heightThe 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.
FloorThe 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
The floor must bear loads larger than 150 kg/m2 (0.21 bf/in.2).
capacity
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ItemRequirements
5 Appendix
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
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 traysUse 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 pipeDo 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
Installation
position of the
Separate the area where the equipment is installed from the equipment
room door. The partition wall can block some outside dust.
Install air conditioner vents so that the air does not blow directly on
equipment.
air conditioner
Other
Avoid the proliferation of mildew, and keep out rodents (like mice).
requirements
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.
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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.
Table 5-11 Requirements for dust particles in the equipment room
5 Appendix
Mechanical active
UnitConcentration
material
Dust particle
Particle /m
3
≤ 3x 10
4
(no visible dust accumulated
on a workbench in three
days)
Suspending dust
Precipitable dust
3
mg/m
mg/m2·h
≤0.2
≤1.5
Description
l Dust particle diameter ≥ 5 µm
l Suspending dust diameter ≤ 75 µm
l 75 µm ≤ precipitable dust diameter ≤ 150 µm
Take the following measures to meet the requirements:
lUse dustproof materials for ground, wall, and ceiling construction.
lUse screens on the door and windows facing outside. The outer windows should be dust-
proof.
lClean the equipment room regularly and clean the air filter monthly.
lWear 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
SO
2
H2S
NH
3
Cl
2
Take the following measures to meet the requirements:
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lAvoid constructing the room near a place where the corrosive gas concentration is high,
such as a chemical plant.
lEnsure the air intake vent of the room is in the prevailing upwind direction from any
pollution source.
lPlace batteries in different rooms.
lA professional service should monitor the corrosive gas conditions regularly.
Requirements for ESD Prevention
The absolute value of electrostatic voltage must be less than 1000 V.
Take the following measures to meet this requirement:
lTrain operators about ESD prevention.
lKeep the correct humidity level in the equipment room to reduce the impact of static
electricity.
lLay out an ESD floor in equipment rooms.
lWear ESD shoes and clothing before entering equipment room.
lUse ESD tools, such as wrist straps, tweezers, and pullers.
lGround all conductive materials in the room, including computer terminals. Use ESD
worktables.
lKeep non-ESD materials (such as common bags, foam, and rubber) at least 30 cm (11.81
in.) away from boards and ESD-sensitive components.
5 Appendix
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:
lTake effective measures against electrical interference from the power supply system.
lDo not use the working ground of the equipment as the same ground for surge
protection. Separate them as far as possible.
lKeep the equipment far away from high-power radio transmitters, radar units, and high-
frequency and high-current equipment.
lUse 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
Capital
construction
Requirements
l Use reinforced concrete to construct the equipment room.
l Install a lightning proof device like a lightning rod outside the room.
l The lightning proof ground shares the same grounding body with
the protective ground of the room.
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ItemRequirements
5 Appendix
Power cables
leading in the
equipment room
need to be
equipped with a
surge protector
Grounding for
DC power
distribution
l 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.
l For an equipment room in urban area, install a power supply surge
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.
l The ground cable of the surge protector should be no longer than 1
m (3.28 ft).
l 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.
l 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).
Equipotential
connection
General
requirements for
grounding
Grounding
resistance
l 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.
l Apply joint grounding to the working ground and protective ground
of devices, which means the two share one grounding network.
l The cable tray, rack or shell, metal ventilation pipe, metal door or
window of the equipment should be grounded for protection.
l Do not connect the neutral line of the AC power cable with the
protective ground of any telecom equipment in the equipment room.
l Do not install a fuse or switch on the ground cable.
l All ground cables should be as short as possible, and arranged in a
straight line.
l The grounding resistance must be lower than 1 ohm.
l 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.
l Measure the grounding resistance periodically to ensure effective
grounding.
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ItemRequirements
5 Appendix
Routing of
signal cable
l Do not arrange the signal cables overhead in the equipment room.
All signal cables must be led into the site underground.
l Use the cables with a metal jacket or place them into a metal pipe if
they come out/in the equipment room.
l Ground the idle lines inside the cable in the equipment room.
l Signal cables should be deployed on internal walls. Do not deploy
outdoor aerial cables.
l Keep signal cables away from power cables and surge protection
devices.
Collective
ground cable
l Use a ground ring or ground bar for the collective ground cable.
l Do not use aluminum cables as ground cables. Adopt measures to
prevent electrification corrosion when connecting different metal
parts together.
l 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-inThe 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.).
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ItemRequirements
5 Appendix
Grounding of the
cabinet
l 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.
l The resistance between the device ground terminals and ground bar
cannot exceed 0.1 ohm.
l 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.
l 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.
l The yellow-green ground cable contains multiple copper wires. The
cross-sectional area of the ground cable must be no less than 6 mm
(0.0093 in.2) and the length cannot exceed 3 m (9.84 ft.).
l Ground cables cannot be twisted with signal cables.
l Antirust and anticorrosion measures must be taken on the ground
terminals.
l 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.
2
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
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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
ItemRequirements
5 Appendix
AC power capacity to
-10% to +5% of the rated voltage
support the devices
AC power capacity to
-15% to +10% of the rated voltage
support the power modules
and important buildings
Frequency of alternating
-4% to +4% of the rated value
current
Voltage wave shape sine
Within 5% of the rated voltage
distortion
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:
lAC neutral should have a conductor with the same cross section as the phase line.
lAC 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.
lIf 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.
lIf 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.
lA UPS or inverter power supply system is required to provide uninterrupted AC power
to support the telecommunication load.
lIf 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.
lStorage 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.
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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.
lA 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.
lA medium-scale enterprise can use a power room and a battery room for centralized
power supply or use distributed power supply systems.
lA 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
5 Appendix
Item
DC power
capacity to
support the surge
current
Regulated
voltage precision
Overshoot
amplitude of
switch on/off
Peak noise
voltage
Dynamic
response
Requirements
Greater than 1.5 times the rated current
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%.
Integral value of the DC output voltage ±5%
≤200 mV
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.
lUse distributed power supply mode. Use multiple DC power supply systems and put
power equipment in multiple locations.
lAdopt a standard DC power supply system, and set the output voltage to the
communications equipment within the required range.
lImprove 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.
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lThe 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.
lInstall 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
5 Appendix
No.
1The working ground and protective ground, including the shielded ground and the
2The cable trays, shells, metal ventilation pipes, metal doors and windows in the
3The metal parts of the equipment which are electrically floating in normal
4The ground cable must be connected securely to the protective ground bar of the
5Do not use other equipment as part of the ground cable or electrical connection.
Description
lightning-proof ground of the cable distribution frame should share the same
grounding conductor.
equipment room should be grounded for protection.
conditions should be grounded for protection.
equipment room.
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.
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Table 5-17 Equipment Grounding Specifications
No.Description
1All 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.
2The 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.).
3There 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.).
4Ensure that all metal components of the cabinet conduct well. No insulating
coating should be sprayed on the connection part of the metal components.
5 Appendix
5Connect 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.
6When 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.
Table 5-18 Grounding specifications for communication power supplies
No.
1The inlet for the AC power cable at the equipment room should be equipped with a
2The protective ground for the power supply and that for communication equipment
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Description
surge protection device (C-level) with a nominal discharge current no less than 20
kA.
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.
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No.Description
3Use a surge protection circuit on the AC power interface.
4The 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.
5The 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.
6Add 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.
5 Appendix
Table 5-19 Grounding specifications for signal cables
No.
1Equip the cable outdoors with a metal jacket, well grounded at both ends, or
2The incoming and outgoing signal cables to and from the office and unused wires
3The Tone & Data Access (TDA) cable must pass through the Main Distribution
4Do not route signal cables overhead.
Description
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.
inside the cable should be grounded for protection.
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.
5.3.6 Specifications for Laying Out Grounding Cables
Table 5-20 shows the specifications for the ground cable.
Table 5-20 Specifications for laying out ground cables
No.
1The grounding wire should not run parallel to or twist around the signal cable.
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No.Description
2Bury ground underground or arrange them indoors. Do not route ground cables
overhead.
3Do not connect two cables together to extend the PGND cable, or add any switches
or fuses.
4The PGND cable should be an alternating yellow and green plastic insulated one
with a copper core.
5The neutral line of the AC power cable cannot be connected to the protective
ground of transmission and communication equipment in the equipment room.
6A 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
5 Appendix
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:
lSignal cables include network cables, optical fibers, and user cables.
lPower cables include the AC power cables and DC power cables.
NOTE
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:
lThickness: 0.09 mm (0.004 in.)
lColor: chalk white
lMaterial: polyester (PET)
lAmbient temperature: -29°C (-20.2°F) to +149°C (300.2°F)
lPrinted by a laser printer and written with a marker
lPass 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
5 Appendix
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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lIf 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.
5 Appendix
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.
NOTE
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:
lAll the printouts must be on the label, and nothing should be printed on the backing layer
of the label page.
lContents 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.
lWhen 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.
5 Appendix
Writing Labels
Writing Tools
Font
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 ballpoint pen, do not leave the oil on the label, which may contaminate the label and blur the
words.
NOTE
The delivered marker has two nibs. Use the smaller nib to write the labels.
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
0
12345678
9ABCDEFGH
IJKLMNOPQ
RSTUVWXYZ
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.
5 Appendix
Label for Signal Cables
lChoose 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
lProcedure 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
5 Appendix
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:
lThe identification card is to the right of the cable in vertical cabling.
lThe identification card is on the top of the cable in horizontal cabling. Make sure that the
label is facing out.
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The identification card is on the
top of the cable in horizontal
cabling.
The identification card is to
the right of the cable in
vertical cabling.
TO:
B03 -48V2
TO:
B03 -48V2
Cable
Cable
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Figure 5-87 Binding the label for the power cable
5 Appendix
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.
lArea 1 contains the location information of the local end of the cable.
lArea 2 (with the word "TO:") contains the location information of the opposite end of the
cable.
lArea 3 has been folded up inside the label.
Figure 5-88 Printed parts on the label for signal cables
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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:
lWhen printing, writing, or attaching labels, keep the labels clean.
lSince the label paper is made of moistureproof material, ink-jet printers and ink pens
cannot be used to print and write labels.
lLabels 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.
lPower cable ties should be attached in the same positions on power cables, with
identification plates on the same side.
lThe 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
5 Appendix
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:
lOne is for the fiber that connects the optical interfaces on two devices.
lThe 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
MN-B-C-DR/T
MeaningExample
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.
B: chassis
number
C: physical slot
number
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