Huawei R250D-E Users Manual

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R250D-E

Hardware Installation and Maintenance Guide

Issue 01

Date 2016-09-30

HUAWEI TECHNOLOGIES CO., LTD.

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.

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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 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.

. All or part of the products, services and features described in this document may not be within the

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang Shenzhen 518129 People's Republic of China

Website:

Email: support@huawei.com

http://www.huawei.com

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R250D-E Hardware Installation and Maintenance Guide

Intended Audience

This document describes hardware features of the R250D-E and provides basic installation methods.

This document is intended for:

l Network planning engineers

About This Document

l Hardware installation engineers

l Commissioning engineers

l Onsite maintenance engineers

l 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

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NOTE

R250D-E Hardware Installation and Maintenance Guide

Symbol Description

Change History

Changes between document issues are cumulative. The latest document issue contains all changes made in previous issues.

Issue 01 (2016-09-30)

Initial commercial release

About This Document

Calls attention to important information, best practices and tips.

NOTE is used to address information not related to personal injury damage, and environment deterioration.

, equipment

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iii

R250D-E Hardware Installation and Maintenance Guide Contents

About This Document.....................................................................................................................ii

1 Product Overview..........................................................................................................................1

1.1 Device Structure............................................................................................................................................................. 2

1.2 Indicator Description...................................................................................................................................................... 3

1.3 Basic Specifications........................................................................................................................................................5

1.4 Ordering Information......................................................................................................................................................6

2 AP Installation............................................................................................................................... 7

2.1 Preparing for Installation................................................................................................................................................ 8

2.2 Installation Flowchart..................................................................................................................................................... 9

2.3 Unpacking the Equipment............................................................................................................................................ 10

2.4 Determining the Installation Position........................................................................................................................... 10

2.5 Installing the Device..................................................................................................................................................... 11

2.5.1 Installing the Device into an 86-Type Box................................................................................................................ 11

2.5.2 Installing the Device on a Desk.................................................................................................................................13

2.6 Cable Connection......................................................................................................................................................... 13

2.7 Checking the Device After Installation........................................................................................................................ 15

2.8 Powering on the Device................................................................................................................................................15

3 Logging In to the Device............................................................................................................ 16

3.1 Logging In to the Device Using STelnet/Telnet........................................................................................................... 17

4 Hardware Failures....................................................................................................................... 18

4.1 A Device Fails to Be Powered On................................................................................................................................19

5 Appendix.......................................................................................................................................21

5.1 On-site Cable Assembly and Installation..................................................................................................................... 22

5.1.1 Cable Assembly Precautions..................................................................................................................................... 22

5.1.2 Assembling Power Cables......................................................................................................................................... 23

5.1.3 Assembling Ethernet Cables......................................................................................................................................31

5.1.4 Installing Cable Accessories......................................................................................................................................45

5.1.5 Replacing the Mold of the Crimping Tool.................................................................................................................61

5.2 Environmental Requirements for Device Operation.................................................................................................... 64

5.2.1 Environmental Requirements for an Equipment Room............................................................................................ 64

5.2.2 Requirements for Power Supply................................................................................................................................72

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5.3 Equipment Grounding Specifications...........................................................................................................................75

5.3.1 General Grounding Specifications

5.3.2 Grounding Specifications for an Equipment Room.................................................................................................. 75

5.3.3 Grounding Specifications for Devices.......................................................................................................................75

5.3.4 Grounding Specifications for Communications Power Supply.................................................................................76

5.3.5 Grounding Specifications for Signal Cables............................................................................................................. 77

5.3.6 Specifications for Laying Out Grounding Cables..................................................................................................... 77

5.4 Engineering Labels for Cables..................................................................................................................................... 78

5.4.1 Introduction to Labels................................................................................................................................................78

5.4.2 Engineering Labels for Optical Fibers.......................................................................................................................86

5.4.3 Engineering Labels for Network Cables................................................................................................................... 89

5.4.4 Engineering Labels for User Cables..........................................................................................................................90

5.4.5 Engineering Labels for Power Cables....................................................................................................................... 91

5.5 Guide to Using Optical Modules.................................................................................................................................. 94

5.6 Fault Tag....................................................................................................................................................................... 97

5.7 Installation Checklist.................................................................................................................................................... 98

.............................................................................................................................75

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About This Chapter

1 Product Overview

The R250D-E in Huawei Agile Distributed W high-density rooms and complex wall structures, such as schools, hotels, hospitals, and office meeting rooms. Huawei R250D-E uses an 86 mm plate in compliance with international standards and can be easily installed into an 86–type box in a room. It is equipped with a built-in antenna and a hidden indicator; therefore, installation of the R250D-E does not affect indoor decorations or designs. It also has an IEEE 802.11a/b/g/n/ac/ac Wave 2 wireless module and can work on both 5 GHz and 2.4 GHz frequency bands. It supports PoE power supply, and can be directly connected to a central AP and deployed in a room. The central AP and the R250D-E are connected through network cables, which greatly extends the coverage range, enhances flexibility in AP deployment and planning, and reduces the engineering construction costs.

1.1 Device Structure

1.2 Indicator Description

1.3 Basic Specifications

1.4 Ordering Information

i-Fi Solution is applicable to scenarios with

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Pass Through

GE0/PoE_IN

R250D-E Hardware Installation and Maintenance Guide

1.1 Device Structure

Figur

e 1-1 shows the appearance of the R250D-E.

Figure 1-1 Appearance of the R250D-E

1 Product Overview

Table 1-1 describes ports on the R250D-E.

able 1-1 Interface description

No. Name Description

1 DC 48V DC power socket: connects a 48 V power adapter to the

device.

2 USB Connects to a USB flash drive or other storage devices to

extend the storage space of the device. The USB2.0 standard is supported.

3 Default Reset button: restores factory settings and restarts the

device if you hold down the button more than 3 seconds.

4 Pass Through Pass Through port: connects to a network cable or phone

cable for transparent transmission.

5 GE2 to GE4 10/100/1000M port: connects to the wired Ethernet.

6 GE1/

PoE_OUT

10/100/1000M port: connects to the wired Ethernet and supports PoE output.

7 GE0/PoE_IN 10/100/1000M port: connects to the wired Ethernet and

supports PoE input.

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GE1/PoE_OUT GE2 GE3 Pass ThroughGE4

Indicator

R250D-E Hardware Installation and Maintenance Guide

NOTE

l The R250D-E supports the following power supply modes: PoE power supply and DC power

supply

l When the device uses the DC power supply, use a power adapter for power supply; otherwise, the

device may be damaged.

1.2 Indicator Description

LED Indicator

The R250D-E provides only a single indicator, as shown in Figure 1-2.

Figure 1-2 Indicator

1 Product Overview

NOTE

l The indicator is located inside the panel, which turns on after the AP is powered on.

l Indicator colors may vary slightly at dif

ferent temperature.

Table 1-2 Indicator description

Type Color Status Description

Default status after

-on

power

Green Steady on The AP is just

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powered on and the software is not started yet.

R250D-E Hardware Installation and Maintenance Guide

Type Color Status Description

1 Product Overview

Software startup status

Green Steady on after

blinking once

Running status Green Blinking once every

2s (0.5 Hz)

Blinking once every 5s (0.2 Hz)

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.

The system is running properly

, the Ethernet connection is normal, and STAs are associated with the AP.

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.

Alarm Green Blinking once

Alarm Green every

0.25s (4 Hz)

l The software is

being upgraded.

l After the

software is uploaded and started, the AP working in Fit AP mode requests to go online on the AC and maintains this state until it goes online successfully on the AC (before the CAPW

AP link is established).

l The AP

registration fails (the CAPWAP link is disconnected).

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Type Color Status Description

Fault Red Steady on A fault that affects

1.3 Basic Specifications

able 1-3 provides basic specifications of the R250D-E.

1 Product Overview

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

Table 1-3 Basic specifications

Item Description

Physical specifications

Dimensions (H x W x D)

36mm x 86mm x 140mm

Weight 0.26kg

System memory

l 256MB DDR3L

l 32MB FLASH

Power specifications

Power input

l DC:48V±5%

l PoE power supply: in compliance with IEEE

802.3af/at

Environment specifications

Maximum power consumption

Operating temperature

11.5 W (excluding the output power of the USB port and PoE_OUT port)

NOTE

The actual maximum power consumption depends on local laws and regulations.

l -60 m to +1800 m: 0°C to +40°C

l 1800 m to 5000 m: T

every time the altitude increases 300 m.

emperature decreases by 1°C

Storage

-40°C to +70°C

temperature

Operating

5% to 95% (non-condensing)

humidity

IP rating IP20

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Item Description

1 Product Overview

Atmospheric pressure

1.4 Ordering Information

o place an order, contact technical support personnel.

Part Number Description

50082922 R250D-E Mainframe(11ac,2x2 Double

53 kPa to 106 kPa

Frequency

,Built-in Antenna)

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About This Chapter

2 AP Installation

2.1 Preparing for Installation

2.2 Installation Flowchart

2.3 Unpacking the Equipment

2.4 Determining the Installation Position

2.5 Installing the Device

2.6 Cable Connection

2.7 Checking the Device After Installation

2.8 Powering on the Device

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2.1 Preparing for Installation

This section describes safety precautions and tool preparations for AP installation.

Safety Precautions

l T

ake proper measures to prevent injuries and device damage.

l Place the device in a dry and flat position away from any liquid and prevent the device

from slipping.

l Keep the device clean.

l Do 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

o install APs, prepare tools listed in Table 2-1.

Table 2-1 Tools

Phillips screwdriver

Slip-proof glove Marker Hammer drill

Claw hammer Diagonal pliers Wire stripper

Protective gloves ESD gloves

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R250D-E Hardware Installation and Maintenance Guide

RJ45 crimping tool Cable cutter Network cable tester

Multimeter Ladder Safety helmet

Safety belt Anti-skid shoes -

2 AP Installation

2.2 Installation Flowchart

The following figure shows the process for installing an AP

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R250D-E Hardware Installation and Maintenance Guide

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 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.

l Remote Unit

l Screws

l Quick Start Guide

l Warranty card

l MAC address label

l SN label

NOTE

If a PoE adapter or a DC power adapter is required, you need to purchase it separately.

2.4 Determining the Installation Position

. Then, investigate causes and

l Do not deploy the device in places with high temperature, dust, noxious gas, unstable

voltage, much vibrations, or strong noise, or in places near flammable or explosive materials and interference sources such as a large radar station, radio station, and transformer station.

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2 AP Installation

l Install the device in a site that is free from leaking or dripping water

humidity, and take protective measures to prevent water from flowing into the equipment along the cable.

l Place the AP far away from electronic devices that may produce radio interference, such

as microwave ovens, antennas, and other radio communication devices. For details, see

Table 2-2.

l Install the device in hidden places and ensure that the device does not disturb daily work

and life of residents.

l Make the engineering design by fully considering such factors as hydrology, geology,

earthquake, electric power, and traffic. The selected site should comply with the environment design specifications of communications equipment.

Table 2-2 General anti-interference requirements

Scenario Deployment Distance Requirement

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.

, heavy dew, and

NOTE

If antennas are embedded into APs, the deployment distance requirements on the antennas are those on APs.

2.5 Installing the Device

NOTE

Remove the protective film on the surface before installation to prevent electrostatic discharge.

2.5.1 Installing the Device into an 86-Type Box

Installing the device in an 86-type box requires expansion screws delivered with the device. The procedure is as follows:

Use a screwdriver to remove the 86-type panel from the wall (skip this step if no 86-type panel is installed on the wall).

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GE1/PoE_OUTPass Through

1N•m

GE1/PoE_OUT GE2 GE3 Pass ThroughGE4

0.16N•m

ST2.5

GE1/PoE_OUT

GE2

GE3

Pass ThroughGE4

R250D-E Hardware Installation and Maintenance Guide

2. Insert a network cable into the GE0/PoE_IN port and a phone cable into the Pass Through port.

3. Connect the cables. For details, see 2.6 Cable Connection.

Open the front cover of the device, align screws on both sides with the screw holes in the 86-type box, and use the Phillips screwdriver to tighten the two screws.

2 AP Installation

5. Close the cover. If torx security screws are used to prevent theft, use a T9 torx security screwdriver to tighten the torx security screws into the device.

NOTE

You need to separately prepare the T9 torx security screwdriver.

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Pass Through

GE0/PoE_IN

R250D-E Hardware Installation and Maintenance Guide

2.5.2 Installing the Device on a Desk

Installing an AP on a desk requires a desktop stand. The procedures are as follows:

Connect the cables. For details, see 2.6 Cable Connection.

2. Align the top of the desktop stand with the grooves on the bottom cover of the AP. Slide the AP along the rail until the stand reaches the end of the grooves. Place the stand with the AP on the desk steadily.

2 AP Installation

NOTE

You need to separately purchase a desktop stand.

2.6 Cable Connection

able 2-3 describes the cable connections.

Figure 2-2 Appearance of the R250D-E

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Table 2-3 Cable connections

No. Cable or Device Description

1 DC power adapter When the device uses the DC power supply, use a power

2 USB cable Connects to a USB flash drive or other storage devices to

2 AP Installation

adapter for power supply; otherwise, the device may be damaged.

extend the storage space of the device. The USB port supports the USB 2.0 standard and a maximum output power of 2.5 W

3 Phone cable or

Network cable

4 Network cable

5 Network cable

The cable is inserted into a Pass Through port for transparent transmission.

l Connects to ST

As through downlink network ports.

l CAT5e cables or higher must be used.

l The length of a network cable cannot exceed 100 m.

However, when the GE1/PoE_OUT port is used for PoE output, the network cable inserted in this port cannot be longer than 20 m.

l The GE1/PoE_OUT port supports PoE output and

provides a maximum of 10 W power output.

NOTICE

l The GE1/PoE_OUT port complies with the category

detection mechanism of 802.3af.

l Do not insert a PoE input cable into the GE1/PoE_OUT port.

l Connects to the Ethernet port of an upper

-layer PSE

through the uplink network port.

l The GE0/PoE_IN port supports PoE input.

l CAT5e cables or higher must be used.

l The length of a network cable cannot exceed 100 m.

NOTE

l If the R250D-E needs to connect to the Ethernet, ensure that the Ethernet cable is working properly

If the Ethernet cable is not working properly, the R250D-E may fail to be powered on or fail to work. Before connecting an Ethernet cable to the R250D-E, use the cable test tool to check whether the cable is qualified. If the cable is unqualified, replace it.

l The R250D-E is powered by either the DC power supply or PoE power supply.

l When the R250D-E works in 802.3af power supply mode, the USB port and PoE_OUT port have no

power output; when it works in 802.3at or DC power supply mode, the USB port and PoE_OUT port have power output.

Pay attention to the following points when bundling the cables:

l 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.

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2 AP Installation

l Bundled cables are closely arranged, straight, tidy

l 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.

l Labels or nameplates must be attached to the cables after they are installed.

, and undamaged.

2.7 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

1 The device is installed by strictly following the design draft. The

installation position meets space requirements, with maintenance space reserved.

2 The device is securely installed.

3 The power cables are intact and not spliced.

4 Terminals of the power cables are welded or cramped firmly.

5 All power cables are not short-circuited or reversely connected and must

be intact with no damage.

6 The power cables and ground cables are separated from other cables and

bundled separately

7 Connectors of signal cables are complete, intact, and tightly connected.

The signal cables are not damaged or broken.

8 Labels on cables are clear and correct.

2.8 Powering on the Device

After the device is powered on, observe indicator on the device to determine the system running status. For details, see 1.2 Indicator Description.

NOTE

Do not frequently power on and off the device.

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R250D-E Hardware Installation and Maintenance Guide

About This Chapter

3 Logging In to the Device

3.1 Logging In to the Device Using ST

elnet/Telnet

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R250D-E Hardware Installation and Maintenance Guide

3 Logging In to the Device

3.1 Logging In to the Device Using STelnet/Telnet

ou 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:

l Power on the device.

l 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

NOTE

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.

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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4 Hardware Failures

This section describes common methods for troubleshooting typical hardware faults.

4.1 A Device Fails to Be Powered On

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4.1 A Device Fails to Be Powered On

Fault Description

4 Hardware Failures

The SYS indicator of a device is of

Possible Causes

Power Supply Mode Possible Cause

Power supply using a power module

PoE power supply

l The device is powered of

l The power cable is not securely

connected to the device.

l The power supply unit has failed.

– 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.

l The power sourcing equipment does not

support the PoE function or is faulty

l The power sourcing equipment is

incorrectly configured (the PoE function is disabled or the power-off time range is improperly set).

l The line is faulty (the network cable or

distribution frame is damaged).

l The device is faulty.

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R250D-E Hardware Installation and Maintenance Guide

Troubleshooting Procedure

Power Supply Mode Troubleshooting Procedure

Power supply using a power module 1. Check whether the device is powered

4 Hardware Failures

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 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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R250D-E Hardware Installation and Maintenance Guide

About This Chapter

5 Appendix

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 T

5.7 Installation Checklist

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5.1 On-site Cable Assembly and Installation

5.1.1 Cable Assembly Precautions

Checking the Appearance of Cables

5 Appendix

l If the cable jacket or insulation is visibly dirty

l If the jacket or insulation of a cable has visible damage, irreparable scuffing, or other

defects, do not use the cable.

l If the shield layer of a cable is damaged, do not use the cable.

l 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

l Do not use connectors with visible defects, damage, rust or scuffing.

l Do not use connectors if their shells or pins have exposed part or uneven plating, or their

pins are lost, broken, or bent.

l 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.

Precautions for Assembly

l Use dedicated tools or tools delivered by Huawei and follow the methods given here

during assembly.

l Hold terminals of cables instead of pulling the cables themselves when installing or

removing cable components.

, clean it before assembly.

l 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.

l 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.

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– Cut all the exposed copper wires.

– T

ry to avoid a second crimping of sleeves.

– Keep all the conductors clean and aligned.

NOTE

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.

Figure 5-1 Components of an OT terminal and a power cable

5 Appendix

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

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.

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, strip a length of insulation coating C

R250D-E Hardware Installation and Maintenance Guide

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 Figur

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e 5-3.

R250D-E Hardware Installation and Maintenance Guide

Figure 5-3 Putting the heat shrink tubing onto the bare crimping terminal

5 Appendix

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.

NOTICE

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

NOTE

The shapes of crimped parts may vary with the crimping dies.

Figur

e 5-4 Crimping the joint parts of the bare crimping terminal and the conductor (OT

terminal)

, as shown in Figure 5-4.

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 Figur

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e 5-5.

R250D-E Hardware Installation and Maintenance Guide

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

Figur

e 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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D. Conductor of a power cable

R250D-E Hardware Installation and Maintenance Guide

Procedure

Step 1 Strip a part of the insulation to expose the cable conductor with a length of L, as shown in

e 5-7. The recommended values of L are listed in Table 5-2.

Figur

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, you can adjust the value of L as

required.

Figure 5-7 Stripping a power cable (JG terminal)

5 Appendix

able 5-2 Mapping between the cross-sectional area of the conductor and the value of L

Cross-Sectional Area of Conductor (mm2(in.2))

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 Figur

Value of L (mm(in.))

e 5-8.

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Figure 5-8 Putting the heat shrink tubing onto the bare crimping terminal

5 Appendix

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 Figur

e 5-10.

Figure 5-10 Heating the heat shrink tubing (JG terminal)

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----End

Assembling the Cord End Terminal and the Power Cable

Context

Figur

e 5-11 shows the components of a cord end terminal and a power cable.

Figure 5-11 Components of a cord end terminal and a power cable

5 Appendix

Procedure

Step 1 Strip a part of the insulation to expose the cable conductor with a length of L1, as shown in

A. Cord end terminal B. Insulation layer of a power cable C. Conductor of a power cable

Figure 5-12. The recommended values of L1 are listed in Table 5-3.

NOTICE

When you strip a power cable, do not damage the conductor of the cable.

Figure 5-12 Stripping a power cable (cord end terminal)

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able 5-3 Mapping between the cross-sectional area of the conductor and the value of L1

5 Appendix

CrossSectional Area of Conductor

(mm2(in.2))

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

edge of the cord end terminal, as shown in Figure 5-13.

Value of L1 (mm(in.))

NOTICE

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.).

Cross-Sectional Area of Conductor

(mm2(in.2))

, and ensure that the conductor is aligned with the

Value of L1 (mm(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 T

5 Appendix

able 5-4.

Table 5-4 Maximum width of a tubular crimped terminal

Cross-Sectional Area of Tubular Terminal (mm2(in.2))

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)

Maximum Width of Crimped Terminal W1 (mm(in.))

----End

5.1.3 Assembling Ethernet Cables

Assembling the Shielded RJ45 Connector and Ethernet Cable

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Context

e 5-15 shows the components of an RJ45 connector and a shielded Ethernet cable.

Figur

Figure 5-15 Shielded RJ45 connector and cable

5 Appendix

Procedure

Step 1 Fit the jacket of the connector onto the Ethernet cable, as shown in Figur

A. Jacket of connector B. Metal shell of connector C. Wire holder of

connector

E. Jacket of Ethernet cable F. Shield layer of Ethernet

cable

G. Twisted-pair wires -

Figure 5-16 Fitting the jacket of the connector onto the Ethernet cable

D. Plug of connector

e 5-16.

Step 2 Remove a 30 mm (1.18 in.) long section of the jacket, cut of

jacket, and cut a no more than 5 mm (0.20 in.) cleft in the jacket, as shown in Figure 5-17.

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f the nylon twine inside the

R250D-E Hardware Installation and Maintenance Guide

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 Figur

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.

e 5-18.

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White-Green

Green

White-Orange

Orange

Blue

White-Blue

White-Brown

Brown

R250D-E Hardware Installation and Maintenance Guide

Figure 5-19 Removing the shield layer of a twisted-pair cable (unit: mm (in.))

5 Appendix

Step 5 Lead the four pairs of twisted-pair wires through the wire holder

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

e 5-21 Cable locations in a wire holder

Figur

, as shown in Figure 5-20 and

Step 6 Align the four pairs of cables in the holder

between the wires and the pins are shown in Figure 5-23 and listed in Table 5-5.

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, as shown in Figure 5-22. The connections

echnologies Co., Ltd.

Brown

Wh ite-Brown

Green

White-Blue

Blue

White-Green

Orange

White-Orange

Pin 8

Pin 1

R250D-E Hardware Installation and Maintenance Guide

Figure 5-22 Four pairs of cables on a wire holder

Figur

e 5-23 Connections between wires and pins

5 Appendix

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able 5-5 Connections between wires and pins (using a straight-through cable as an example)

Matching Pins of Wires Wire Color

1 White-Orange

2 Orange

3 White-Green

4 Blue

5 White-Blue

6 Green

7 White-Brown

echnologies Co., Ltd.

R250D-E Hardware Installation and Maintenance Guide

Matching Pins of Wires Wire Color

8 Brown

5 Appendix

Step 7 Cut of

f 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

e 5-25.

Figur

NOTE

Ensure that the wire holder is in good contact with the connector body.

e 5-25 Putting the connector body onto the wire holder

Figur

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 Figur

Figure 5-27 Pushing the metal shell

5 Appendix

e 5-27.

Step 11 T

o 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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White-Orange

White-Green

Orange

Blue

White-Blue

Green

White-Brown

Brown

Pin 8

Pin 1

R250D-E Hardware Installation and Maintenance Guide

Figure 5-28 Components of an unshielded RJ45 connector and cable

A. Plug of connector B. Jacket C. Twisted-pair wires

Procedure

5 Appendix

Step 1 Remove a 16-mm (0.63 in.) long section of the jacket, as shown in Figur

NOTICE

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

connections between the wires and the pins are listed in Table 5-6.

Figure 5-30 Connections between wires and pins (unit: mm (in.))

, as shown in Figure 5-30. The

e 5-29.

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able 5-6 Connections between wires and pins (using a straight-through cable as an example)

Matching Pins of Wires Wire Color

1 White-Orange

2 Orange

3 White-Green

4 Blue

5 White-Blue

6 Green

7 White-Brown

8 Brown

5 Appendix

Step 3 Feed the cable into the plug, and crimp the connector

NOTE

When inserting the cable, check from the side or bore of the plug to ensure that the cable is completely seated in the plug.

e 5-31 Crimping the connector

Figur

Step 4 T

o complete the assembly of the other end, repeat Step 1 through Step 3.

----End

Checking the Appearance of Contact Strips

, as shown in Figure 5-31.

Context

l 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.

l 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°.

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o ensure conductivity, the surface of the contact strips must be clean.

l T

l The contact strips must be in good contact with the RJ45 socket. The plastic separators

must remain intact and be aligned.

l 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.

NOTE

All unqualified pieces must be crimped again.

Figur

e 5-32 Contact strips of different heights

5 Appendix

e 5-33 Contact strips of the same height

Figur

Step 2 Hold an RJ45 connector and turn it 45°. Observe the top edges of the metal contact strips.

e 5-34 shows an unqualified piece.

Figur

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5 Appendix

Figure 5-34 Unparallel contact strips of dif

ferent 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.

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

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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 Wires not in good contact with the edge of the RJ45

----End

5 Appendix

. Figure 5-37 shows an unqualified piece.

Testing the Connection of Assembled Cables

Context

Huawei provides two types of Ethernet cables: straight-through cables and crossover cables.

l Straight-through cables are connected in a one-to-one manner

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

2 2 Orange Twisted

1 1 Orange-White

6 6 Green Twisted

3 3 Green-White

4 4 Blue Twisted

. They are used to connect

5 5 Blue-White

8 8 Brown Twisted

7 7 Brown-White

l Crossover cables are connected in a crossover manner

terminals such as two computers or switches. Table 5-8 lists the connections of core wires in a crossover cable.

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. They are used to connect

Pin8

Pin1

R250D-E Hardware Installation and Maintenance Guide

Table 5-8 Connections of core wires in a straight crossover cable

RJ45 Connector 1 RJ45 Connector 2 Core Wire Color Twisted or Not

6 2 Orange Twisted

3 1 Orange-White

2 6 Green Twisted

1 3 Green-White

4 4 Blue Twisted

5 5 Blue-White

8 8 Brown Twisted

7 7 Brown-White

Figur

e 5-38 shows the pins of an RJ45 connector.

5 Appendix

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

Figure 5-38 Pins of an RJ45 connector

on simultaneously, you can infer that the pins work normally and the wires are correctly connected.

NOTE

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.

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5 Appendix

Figure 5-39 T

esting 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 Figur

e 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

5 Appendix

If a tester is not available, you can use a multimeter to perform a simple test, as shown in Figur

Figure 5-41 Testing the connection of an Ethernet cable

e 5-41.

----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 T

able 5-9.

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R250D-E Hardware Installation and Maintenance Guide

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

Fiber R ≥ 40 mm (1.57 in.); Bending angle > 90°

NOTE

The letter d indicates the diameter of a cable or fiber.

Precautions for Installation

l Hold terminals of cables instead of pulling the cables themselves when installing or

removing cable components.

l Do not insert a connector forcibly when the connector is blocked. Use a dedicated tool to

pull out the connector inserted properly.

l 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.

l When removing densely aligned cables or fiber connectors, use dedicated pliers such as

cable-pulling pliers and fiber-pulling pliers.

l Do not twist, bend, stretch, or extrude fibers during installation.

l Cover the idle fiber connectors with dust caps. Remove the dust caps before using the

fiber connectors.

5 Appendix

connected with a connector, R ≥ 5d.

. Install the connector again after you check that the pins are

Requirements for Cable Routing

l To protect cables, remove the burrs in the cable through-holes or install protective rings

in the holes.

l 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.

l Bind or clean cables gently because cable distortion affects signal quality.

l Keep cables away from moveable components such as doors.

l Sharp objects must not touch cable wiring to prevent damage to cables.

l To 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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R250D-E Hardware Installation and Maintenance Guide

Procedure

l Install an OT terminal.

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

5 Appendix

NOTE

When you install an OT terminal, the crimping sleeve is installed as shown in Figur where A is correct and B is incorrect.

Figure 5-43 Installing an OT terminal, showing the orientation of crimping sleeve

Place the spring washer and flat washer in turn, mount a matching screw, and fasten

it clockwise, as shown in Figure 5-44.

e 5-43,

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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 Figur

5-45.

Figure 5-45 Installed OT terminal

l 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 lar 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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ge contact area.

R250D-E Hardware Installation and Maintenance Guide

Figure 5-46 Bending the upper OT terminal at a 45- or 90-degree angle

e 5-47 Crossing two terminals

Figur

5 Appendix

NOTICE

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.

l T

o 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.

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Figure 5-48 Placing a terminal on a terminal jack vertically

5 Appendix

Step 2 Insert the terminal into the jack vertically

as shown in Figure 5-49.

Figure 5-49 Feeding the terminal into the jack

NOTICE

, and turn the screw clockwise to fasten the terminal,

l Ensure that the exposed section of the terminal is less than 2 mm (0.079 in.) in length.

l Do not press the insulation of the terminal.

l 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

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Installing a Shielded Ethernet Connector

Procedure

5 Appendix

Step 1 Hold the male and female connectors, with the male connector facing the female connector

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

Figure 5-51 Feeding the male shielded connector into the female shielded connector

, as shown in Figure 5-51.

, as

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 Figur

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e 5-52.

R250D-E Hardware Installation and Maintenance Guide

Figure 5-52 Installed shielded Ethernet connector

5 Appendix

Step 4 T

o remove an Ethernet connector, press the locking key and pull out the connector, as shown

in Figure 5-53.

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

shown in Figure 5-54.

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, as

R250D-E Hardware Installation and Maintenance Guide

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.

Figure 5-55 Feeding the male connector into the female unshielded connector

5 Appendix

Step 3 A crisp click indicates that the connector is locked by the locking key

slightly and ensure that it is securely connected. Figure 5-56 shows an installed Ethernet connector.

Figure 5-56 Installed unshielded Ethernet connector

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. Pull the connector

R250D-E Hardware Installation and Maintenance Guide

5 Appendix

Step 4 T

o remove an Ethernet connector, press the locking key and pull out the connector, as shown

in Figure 5-57.

Figure 5-57 Removing an unshielded Ethernet connector

----End

Installing Fiber Connectors

Context

NOTICE

l After you remove the dustproof cap, ensure that the fiber pins are clean and install them as

soon as possible.

l 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

Ensure that the pins are free from any fiber or debris.

, clean the pins by using an air gun.

----End

Installing an FC Fiber Connector

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Procedure

Step 1 Remove the dustproof cap of the FC connector and store it for future use.

5 Appendix

Step 2 Align the core pin of the male connector with that of the female connector

, as shown in

Figure 5-58.

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 Figur

e 5-60.

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Figure 5-60 Fastening the locking nut

5 Appendix

Step 5 T

o 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

Figure 5-62.

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, as shown in

R250D-E Hardware Installation and Maintenance Guide

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

Figure 5-63 Feeding the male connector into the female connector

5 Appendix

, as shown in Figure 5-63.

Step 4 A clicking sound indicates that the male connector is locked, as shown in Figur

Figure 5-64 Installed LC connector

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e 5-64.

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5 Appendix

Step 5 T

o 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

----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

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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, with your fingers holding the shell of the

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Figure 5-67 Installed SC fiber connector

5 Appendix

Step 4 T

o 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

Figure 5-69.

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, as shown in

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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

e 5-70.

Figur

5 Appendix

Step 4 T

Figure 5-70 Installed MPO fiber connector

o 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

5 Appendix

Procedure

Step 1 Hold the handles of a pair of COAX crimping tools. Loosen the two fastening screws

Step 2 Hold the handles of the COAX crimping tools to open the self-locking mechanism. The jaw

counterclockwise, as shown in Figur

Figure 5-72 Loosening two fastening screws

of the COAX crimping tools opens automatically

e 5-72.

, as shown in Figure 5-73.

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Figure 5-73 Pliers jaw opening automatically

5 Appendix

Step 3 Remove the mold from the COAX crimping tools, as shown in Figur

e 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 Figur

e 5-75.

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Figure 5-75 Installing a new mold in the COAX crimping tool

5 Appendix

NOTICE

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

Figure 5-76 Aligning the screw holes

. Align the screw holes, as shown in Figure 5-76.

Step 6 Hold the handles of the COAX crimping tools with one hand. T

screws clockwise. Figure 5-77 and Figure 5-78shows the mold installed in the COAX crimping tool.

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ighten the two fastening

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Figure 5-77 Mold installed in the COAX crimping tool

Figur

e 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:

l The room should be located at a distance of at least 5 km (3.1

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.

l 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.

l 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.

l The room should be located far away from industrial and heating boilers.

l 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.

l The doors and windows of the equipment room must be kept closed to maintain an

airtight room.

l Using steel doors to ensure sound insulation is recommended.

l 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, wearresistant, dustproof, flame retardant, sound insulated, heat absorptive, and have electromagnetic shielding.

l 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.

l 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.

l The equipment room should be strong enough to resist winds and downpours.

l 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.

l 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.

l Do not use decorative materials that contain sulfur in the equipment room.

5 Appendix

1 mi.) from heavy pollution

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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Control room Generator room

Transmission

room

Main communication

equipment room

Power distribution

room

Battery room

Substation room

Communication cable and optical cable

Power cable

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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:

l It should meet requirements for laying out and maintaining communication cables and

power cables.

l It should reduce the cabling distance, which facilitates cable maintenance, reduces

potential communication faults, and maximizes ef

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 lar

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

The floor must bear loads larger than 150 kg/m2 (0.21 bf/in.2).

capacity

ficiency.

gest capacity.

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Item Requirements

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

Wall surface

treatment

them tightly

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

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

Figur

e 5-80 Internal partition wall inside the equipment room

Equipment Room Environment

Dust on devices may cause electrostatic dischar

ge 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. T

able 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

Unit Concentration

material

Dust particle

Particle /m

≤ 3x 10

(no visible dust accumulated on a workbench in three days)

Suspending dust

Precipitable dust

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

ake the following measures to meet the requirements:

l Use dustproof materials for ground, wall, and ceiling construction.

l Use screens on the door and windows facing outside. The outer windows should be dust-

proof.

l Clean the equipment room regularly and clean the air filter monthly.

l 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

H2S

ake the following measures to meet the requirements:

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mg/m

≤0.20

≤0.006

≤0.05

≤0.01

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void constructing the room near a place where the corrosive gas concentration is high,

l A

such as a chemical plant.

l Ensure the air intake vent of the room is in the prevailing upwind direction from any

pollution source.

l Place batteries in different rooms.

l A 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:

l Train operators about ESD prevention.

l Keep the correct humidity level in the equipment room to reduce the impact of static

electricity.

l Lay out an ESD floor in equipment rooms.

l Wear ESD shoes and clothing before entering equipment room.

l Use ESD tools, such as wrist straps, tweezers, and pullers.

l Ground all conductive materials in the room, including computer terminals. Use ESD

worktables.

l 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.

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:

l Take effective measures against electrical interference from the power supply system.

l Do not use the working ground of the equipment as the same ground for surge

protection. Separate them as far as possible.

l Keep the equipment far away from high-power radio transmitters, radar units, and high-

frequency and high-current equipment.

l 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

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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Item Requirements

5 Appendix

Power cables

leading in the

equipment room

need to be

equipped with a

ge protector

sur

Grounding for

DC power

distribution

l After the low-voltage power cables are led into the room, install the

sur

ge 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 ef

fective

grounding.

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Item Requirements

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 under

ground.

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 dif

ferent 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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Item Requirements

5 Appendix

Grounding of the cabinet

l All the devices including the sur

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.

ge protection device in the cabinet

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 1

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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10 V/220 V, with a frequency of 50 Hz.

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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.

able 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

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:

l AC neutral should have a conductor with the same cross section as the phase line.

l 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

l 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.

l 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.

l A UPS or inverter power supply system is required to provide uninterrupted AC power

to support the telecommunication load.

l 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.

l 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.

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Requirements for DC Power Supply

5 Appendix

The equipment room should receive stable and reliable DC 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.

l 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.

l A medium-scale enterprise can use a power room and a battery room for centralized

power supply or use distributed power supply systems.

l 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 sur current

Greater than 1.5 times the rated current

. Deploy the power

Regulated voltage precision

Overshoot amplitude of switch on/off

Peak noise voltage

Dynamic response

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

l Use distributed power supply mode. Use multiple DC power supply systems and put

power equipment in multiple locations.

l Adopt a standard DC power supply system, and set the output voltage to the

communications equipment within the required range.

l 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.

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l The total capacity of the high-frequency switching rectifier must satisfy the power of the

communication loading and battery char modules, configure one backup module. If there are more than 10 active modules, configure one backup module for every 10 active modules.

l 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.

ging. If there are 10 or fewer active rectifier

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

5 Appendix

1 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

2 The cable trays, shells, metal ventilation pipes, metal doors and windows in the

equipment room should be grounded for protection.

3 The metal parts of the equipment which are electrically floating in normal

conditions should be grounded for protection.

4 The ground cable must be connected securely to the protective ground bar of the

equipment room.

5 Do not use other equipment as part of the ground cable or electrical connection.

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 of less than five ohms. The grounding resistance in an area where the earth resistance rate is high should be less than 10 ohms.

fice should be

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

1 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 in the room together with the protective ground (PGND) of the device.

2 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.).

3 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.).

4 Ensure 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

, and then to the same protective ground bar

5 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.

6 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

able 5-18 shows the grounding specifications for communication power supplies.

Table 5-18 Grounding specifications for communication power supplies

No. Description

1 The inlet for the AC power cable at the equipment room should be equipped with a

ge protection device (C-level) with a nominal discharge current no less than 20

sur kA.

2 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.

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No. Description

3 Use a surge protection circuit on the AC power interface.

4 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

5 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.

6 Add surge protection on the DC power interface.

5.3.5 Grounding Specifications for Signal Cables

able 5-19 lists the grounding specifications for signal cables.

5 Appendix

Table 5-19 Grounding specifications for signal cables

No. Description

1 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 sur interface to the equipment. The PGND cable for the surge protection devices should be as short as possible.

2 The incoming and outgoing signal cables to and from the office and unused wires

inside the cable should be grounded for protection.

3 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.

4 Do not route signal cables overhead.

ge protection devices at the

5.3.6 Specifications for Laying Out Grounding Cables

able 5-20 shows the specifications for the ground cable.

Table 5-20 Specifications for laying out ground cables

No. Description

1 The grounding wire should not run parallel to or twist around the signal cable.

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No. Description

2 Bury ground underground or arrange them indoors. Do not route ground cables

overhead.

3 Do not connect two cables together to extend the PGND cable, or add any switches

or fuses.

4 The PGND cable should be an alternating yellow and green plastic insulated one

with a copper core.

5 The neutral line of the AC power cable cannot be connected to the protective

ground of transmission and communication equipment in the equipment room.

6 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

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:

l Signal cables include network cables, optical fibers, and user cables.

l Power 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:

l Thickness: 0.09 mm (0.004 in.)

l Color: chalk white

l Material: polyester (PET)

l Ambient temperature: -29°C (-20.2°F) to +149°C (300.2°F)

l Printed by a laser printer and written with a marker

l Pass UL and CSA authentication

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Type and Structure

Label for Signal Cables

5 Appendix

The label for signal cables is L-shaped with fixed dimensions, as shown in Figur

Figure 5-81 Label for signal cables

e 5-81.

o specify more clearly the position of a cable, use the dividing lines on the label. For

T 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

5 Appendix

Label Printing

The contents can be printed or written on the labels. Printing is recommended for the sake of high ef

ficiency 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:

l You can modify the contents of the template. Do not change settings of centered

characters, direction, and fonts.

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l 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

o 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 Figur the printing.

e 5-83 appears before printing, click Ignore to continue

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

5 Appendix

The label paper consists of two layers and has under 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:

l All the printouts must be on the label, and nothing should be printed on the backing layer

of the label page.

l 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.

l 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.

gone multiple processing procedures such

Font

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 (Times New Roman).

Table 5-21 Standard typeface for handwriting

0 1 2 3 4 5 6 7 8

9 A B C D E F G H

I J K L M N O P Q

R S T U V W X Y Z

, use standard block letters and numbers as shown in Table 5-21

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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5 Appendix

Placement of text on a label is shown in Figur

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

l Choose the place to attach labels.

e 5-84.

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 af 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

fecting other cables), other positions are

l Procedure for attaching labels

Figur

e 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 Figur

l The identification card is to the right of the cable in vertical cabling.

l The identification card is on the top of the cable in horizontal cabling. Make sure that the

e 5-87. The details are as follows:

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

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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 af 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.

l Area 1 contains the location information of the local end of the cable.

l Area 2 (with the word "TO:") contains the location information of the opposite end of the

cable.

l Area 3 has been folded up inside the label.

Figure 5-88 Printed parts on the label for signal cables

fixed on only one side of the identification plates. On the labels,

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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 "T

O:" 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:

l When printing, writing, or attaching labels, keep the labels clean.

l Since the label paper is made of moistureproof material, ink-jet printers and ink pens

cannot be used to print and write labels.

5 Appendix

l Labels should be attached neatly

incorrect locations or in the incorrect direction, the appearance of the device is affected.

l Power cable ties should be attached in the same positions on power cables, with

identification plates on the same side.

l The positions of "up", "down", "left" or "right" are all based on the viewpoint of the

engineering person who is working on the label.

. New-type labels are L-shaped. If they are pasted at

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:

l One is for the fiber that connects the optical interfaces on two devices.

l 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-DR/T

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MN: cabinet number

B: chassis number

C: physical slot 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.

Numbered in bottom-up order with two digits, for example, 01.

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.

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A01

TO:

01 05 01

G01

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Content Meaning Example

5 Appendix

Example of the Label

Figur

e 5-89 shows a sample label on an optical fiber.

Figure 5-89 Sample label on an optical fiber between two devices

D: optical interface number

R: Receiving interface

T: optical transmitting interface

Numbered in top-down and left-right order, consistent with the port sequence number on the device.

The meaning of the label is listed in Figur

e 5-89.

l "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.

l "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-DR/T

MN: cabinet number

For example, A01.

B: chassis number

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Numbered in bottom-up order with two digits, for example, 01.

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ODF

TO:

G01 01 01

A01

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Content Meaning Example

5 Appendix

ODF-MN-BC-R/T

C: physical slot number

D: optical interface number

R: Optical receiving interface

T: optical transmitting interface

MN: row number and column number of an ODF

B: row number of the terminal device

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.

Numbered in top-down and left-right order, consistent with the port sequence number on the device.

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.

Range from 01 to 99, for example, 01-01.

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

C: column number of the terminal device

R: Optical receiving interface

T: optical transmitting interface

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Meaning of the label in Figur

l "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.

l "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.

e 5-90

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

B: chassis number

C: physical slot number

D: network port number

MN-Z MN: cabinet

number

Z: Location number

For example, A01 is the first cabinet in row A.

Numbered in bottom-up order with two digits, for example, 01.

Numbered with two digits in top-down and leftright order. For example, 01.

Numbered in top-down and left-right orders. For example, 01.

For example, B02 is the second cabinet in row B.

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.

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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A01

TO:

03 01 01

B02

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l 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.

l 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 T

l 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

5 Appendix

able 5-24.

Meaning of the label in Figur

e 5-91.

l "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.

l "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

For example, A01 is the first cabinet in row A.

number

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A01

TO:

03 01 01

MDF

G01

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Content Meaning Example

B: frame number Numbered in the bottom-up order with two digits,

5 Appendix

for example, 03.

MDF-MN-B-C MN: row number

Example of the Label

Figur

e 5-92 shows a sample label on a user cable.

C: physical slot number

Numbered with two digits in top-down and leftright order

. For example, 01.

D: cable number Numbered with two digits in top-down and left-

right order. For example, 01.

M: The rows of cabinets from front to back are and column number of the MDF

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

Ranges from 01 to 99, for example, 01-01. the terminal device

C: column number of the terminal device

Figure 5-92 Sample label on a user cable

The meaning of the label in Figur

e 5-92 is as follows:

l "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.

l "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

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Engineering Labels for DC Power Cables

5 Appendix

These labels are af

fixed 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 Meaning

MN(BC)B--48Vn

MN(BC)-BBGND

MN(BC): BC is written right under MN.

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 leftto-right orders.

MN(BC)-BPGND

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

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5 Appendix

The meaning of the label in Figur

e 5-93 is as follows:

l 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.

l 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.

NOTE

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.

PGND and BGND are two copper bars, on which the terminal blocks are short-circuited. Therefore, it makes no dif

ference 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

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

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Label on the loaded cabinet side (indicating the position of the cable on the power distribution box)

Label on the distribution box side (indicating the position of the cable on the loaded cabinet side)

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Figure 5-94 Labels for AC power cables

5 Appendix

e 5-94.

Meaning of the label in Figur

e 5-94.

l 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.

l 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

NOTE

The system may fail to obtain information about non-Huawei-certified optical modules or obtain incorrect information. Y 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 selfloop 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.

ou are advised to use Huawei-certified optical modules. Obtain the electronic label of the

Issue 01 (2016-09-30) Huawei Proprietary and Confidential

echnologies Co., Ltd.

Huawei R250D-E Users Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

About This Document

Contents

1 Product Overview

1.1 Device Structure

1.2 Indicator Description

1.3 Basic Specifications

1.4 Ordering Information

2 AP Installation

2.1 Preparing for Installation

2.2 Installation Flowchart

2.3 Unpacking the Equipment

2.4 Determining the Installation Position

2.5 Installing the Device

2.5.1 Installing the Device into an 86-Type Box

2.5.2 Installing the Device on a Desk

2.6 Cable Connection

2.7 Checking the Device After Installation

2.8 Powering on the Device

3 Logging In to the Device

3.1 Logging In to the Device Using STelnet/Telnet

4 Hardware Failures

4.1 A Device Fails to Be Powered On

5 Appendix

5.1 On-site Cable Assembly and Installation

5.1.1 Cable Assembly Precautions

5.1.2 Assembling Power Cables

5.1.3 Assembling Ethernet Cables

5.1.4 Installing Cable Accessories

5.1.5 Replacing the Mold of the Crimping Tool

5.2 Environmental Requirements for Device Operation

5.2.1 Environmental Requirements for an Equipment Room

5.2.2 Requirements for Power Supply

5.3 Equipment Grounding Specifications

5.3.1 General Grounding Specifications

5.3.2 Grounding Specifications for an Equipment Room

5.3.3 Grounding Specifications for Devices

5.3.4 Grounding Specifications for Communications Power Supply

5.3.5 Grounding Specifications for Signal Cables

5.3.6 Specifications for Laying Out Grounding Cables

5.4 Engineering Labels for Cables

5.4.1 Introduction to Labels

5.4.2 Engineering Labels for Optical Fibers

5.4.3 Engineering Labels for Network Cables

5.4.4 Engineering Labels for User Cables

5.4.5 Engineering Labels for Power Cables

5.5 Guide to Using Optical Modules