DBS3900 WiMAX Site Maintenance Guide(V300R003C00_02)

DBS3900 WiMAXV300R003C00

Site Maintenance Guide

Issue 02

Date 2010-10-22

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2010. All rights reserved.No part of this document may be reproduced or transmitted in any form or by any means without prior writtenconsent of Huawei Technologies Co., Ltd. Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.All other trademarks and trade names mentioned in this document are the property of their respective holders. NoticeThe purchased products, services and features are stipulated by the contract made between Huawei and thecustomer. All or part of the products, services and features described in this document may not be within thepurchase 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 representationsof any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in thepreparation of this document to ensure accuracy of the contents, but all statements, information, andrecommendations in this document do not constitute the warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.Address: Huawei Industrial Base

Bantian, LonggangShenzhen 518129People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

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http://www.huawei.com

mailto:[email protected]

About This Document

OverviewAfter the DBS3900 WiMAX site is deployed, approved, and put into use, routine maintenanceis performed to ensure the functionality of the DBS3900 WiMAX.

This document describes the routine hardware maintenance items for the DBS3900 WiMAX,such as maintenance items concerning the equipment room, power supply system, groundingsystem, and DBS3900 equipment. The document also provides guidelines for replacing thecomponents, modules, and cables of the DBS3900.

Product VersionThe following table lists the product version related to this document.

Product Name Product Version

DBS3900 WiMAX V300R003C00

Intended AudienceThis document is intended for:

l System engineersl Site maintenance engineers

Change HistoryVersion Change History

02(2010-10-22) This is a commercial version, which isreleased for the second time.

DBS3900 WiMAXSite Maintenance Guide About This Document


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Version Change History

01(2010-06-07) This is a draft version, which is released forthe first time.Compared with V300R002C03 02(2010-04-26), this release has the followingupdates:l 8 Replacing the Components in the

OMB is added.l 5 Replacing the Components of the

RRU3702/RRU3703 is modified.

Organization1 Site Maintenance Preparations

The preparations for the DBS3900 site maintenance cover the activities of obtaining siteinformation, selecting maintenance items, and arranging for tools and spare parts.

2 DBS3900 Routine Hardware Maintenance Tasks

The tasks of the routine hardware maintenance of the DBS3900 include: the environmentalmaintenance of the equipment room, the maintenance of the power supply system and groundingsystem of the BTS, the maintenance of the BBU, the maintenance of the RRU, the maintenanceof cables, and the maintenance of the antenna system.

3 Powering On and Powering Off the DBS3900

When you power on the DBS3900, you need to check the status of the indicators of all theequipment. When you power off the DBS3900, you can choose the normal power-off oremergency power-off according to the actual situation.

4 Replacing the Components of the BBU3900

The faulty BBU3900 components must be replaced promptly. The components that can bereplaced are the BBU case, boards, modules, and optical module. All boards are hot-swappable.When boards are running, abnormal power-off of boards will not cause damage to the hardwareand software.

5 Replacing the Components of the RRU3702/RRU3703

The faulty RRU3702/RRU3703 components must be replaced promptly. The components thatcan be replaced are the RRU3702/RRU3703 module, and the optical module.

6 Replacing the Components of the Fan-Cooling RRU3701C

Faulty RRU3701C components must be replaced promptly. The components that can be replacedfor the fan-cooling RRU3701C are the RRU3701C module, case, fan subrack, and opticalmodule.

7 Replacing the Components of the Natural-Cooling RRU3701C

Faulty RRU3701C components must be replaced promptly. The components that can be replacedfor the natural-cooling RRU3701C are the RRU3701C module, shell, and optical module.

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8 Replacing the Components in the OMB

This section describes how to replace the HEUA board, AC/DC power cable, DCDU, and theAC surge protection box in the OMB.

9 Replacing the Components of the SLPU

During maintenance of the SLPU, the components to be replaced include the SLPU case andthe UELP board.

10 Replacing the Surge Protector for the Antenna System

When the surge protector for the antenna system at the BBU side is faulty, you need to replaceit.

11 Replacing the Cables of the DBS3900

When the DBS3900 cables are faulty, you need to replace them promptly. The cables can bereplaced are: transmission cables, signal cables, and RF jumpers.

ConventionsSymbol Conventions

The symbols that may be found in this document are defined as follows.

Symbol Description

Indicates a hazard with a high level of risk, which if notavoided,will result in death or serious injury.

Indicates a hazard with a medium or low level of risk, whichif not avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation, which if notavoided,could result in equipment damage, data loss,performance degradation, or unexpected results.

Indicates a tip that may help you solve a problem or savetime.

Provides additional information to emphasize or supplementimportant points of the main text.

General Conventions

The general conventions that may be found in this document are defined as follows.

Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

Boldface Names of files, directories, folders, and users are inboldface. For example, log in as user root.



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Italic Book titles are in italics.

Courier New Examples of information displayed on the screen are inCourier New.

Command Conventions

The command conventions that may be found in this document are defined as follows.


Boldface The keywords of a command line are in boldface.

Italic Command arguments are in italics.

[ ] Items (keywords or arguments) in brackets [ ] are optional.

{ x | y | ... } Optional items are grouped in braces and separated byvertical bars. One item is selected.

[ x | y | ... ] Optional items are grouped in brackets and separated byvertical bars. One item is selected or no item is selected.

{ x | y | ... }* Optional items are grouped in braces and separated byvertical bars. A minimum of one item or a maximum of allitems can be selected.

[ x | y | ... ]* Optional items are grouped in brackets and separated byvertical bars. Several items or no item can be selected.

GUI Conventions

The GUI conventions that may be found in this document are defined as follows.


Boldface Buttons, menus, parameters, tabs, window, and dialog titlesare in boldface. For example, click OK.

> Multi-level menus are in boldface and separated by the ">"signs. For example, choose File > Create > Folder.

Keyboard Operations

The keyboard operations that may be found in this document are defined as follows.

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Format Description

Key Press the key. For example, press Enter and press Tab.

Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt+A means the three keys should be pressed concurrently.

Key 1, Key 2 Press the keys in turn. For example, pressing Alt, A meansthe two keys should be pressed in turn.

Mouse Operations

The mouse operations that may be found in this document are defined as follows.

Action Description

Click Select and release the primary mouse button without movingthe pointer.

Double-click Press the primary mouse button twice continuously andquickly without moving the pointer.

Drag Press and hold the primary mouse button and move thepointer to a certain position.



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Contents

About This Document...................................................................................................................iii

1 Site Maintenance Preparations................................................................................................1-1

2 DBS3900 Routine Hardware Maintenance Tasks................................................................2-12.1 Environmental Maintenance Tasks of the Equipment Room .........................................................................2-22.2 Power Supply System and Grounding System Maintenance Tasks................................................................2-32.3 Maintenance Tasks of the BBU...................................................................................................................... 2-42.4 Maintenance Tasks of the RRU...................................................................................................................... 2-52.5 Maintenance Tasks of the Cables....................................................................................................................2-62.6 Maintenance Tasks of the Antenna System................................................................................................... 2-7

3 Powering On and Powering Off the DBS3900.....................................................................3-13.1 Powering On the BBU.....................................................................................................................................3-23.2 Powering Off the BBU....................................................................................................................................3-43.3 Powering On the RRU.....................................................................................................................................3-43.4 Powering Off the RRU....................................................................................................................................3-8

4 Replacing the Components of the BBU3900.........................................................................4-14.1 Replacing the Case of the BBU3900...............................................................................................................4-34.2 Replacing the BMPT.......................................................................................................................................4-54.3 Replacing the BBBI........................................................................................................................................ 4-74.4 Replacing the UPEU....................................................................................................................................... 4-94.5 Replacing the UEIU......................................................................................................................................4-114.6 Replacing the FAN........................................................................................................................................4-124.7 Replacing the UTRP......................................................................................................................................4-144.8 Replacing the USCU.....................................................................................................................................4-174.9 Replacing the Optical Modules.....................................................................................................................4-18

5 Replacing the Components of the RRU3702/RRU3703.......................................................5-15.1 Replacing the RRU3702/RRU3703................................................................................................................5-25.2 Replacing the Optical Modules.......................................................................................................................5-5

6 Replacing the Components of the Fan-Cooling RRU3701C..............................................6-16.1 Replacing the Fan-Cooling RRU3701C..........................................................................................................6-26.2 Replacing the RRU3701C Case......................................................................................................................6-36.3 Replacing the Fan Subrack of the RRU3701C................................................................................................6-4

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6.4 Replacing the Optical Modules.......................................................................................................................6-5

7 Replacing the Components of the Natural-Cooling RRU3701C.......................................7-17.1 Replacing the Natural-Cooling RRU3701C....................................................................................................7-27.2 Replacing the Shell of the RRU3701C...........................................................................................................7-37.3 Replacing the Optical Modules.......................................................................................................................7-4

8 Replacing the Components in the OMB................................................................................8-18.1 Replacing the HEUA.......................................................................................................................................8-28.2 Replacing the AC/DC Power Equipment........................................................................................................8-48.3 Replacing the DCDU......................................................................................................................................8-98.4 Replacing the AC Surge Protection Box.......................................................................................................8-12

9 Replacing the Components of the SLPU ..............................................................................9-19.1 Replacing the SLPU Case...............................................................................................................................9-29.2 Replacing the UELP........................................................................................................................................9-3

10 Replacing the Surge Protector for the Antenna System.................................................10-1

11 Replacing the Cables of the DBS3900................................................................................11-111.1 Replacing the BBU Power Cables..............................................................................................................11-311.2 Replacing the Dry Contact Alarm Cables...................................................................................................11-411.3 Replacing the GPS Clock Signal Cables.....................................................................................................11-511.4 Replacing the Monitoring Signal Cables....................................................................................................11-6

11.4.1 Replacing the CMUA-BBU Monitoring Signal Cable......................................................................11-611.4.2 Replacing the EMUA Monitoring Signal Cable................................................................................11-7

11.5 Replacing E1/T1 Signal Cables of the BBU3900.......................................................................................11-811.6 Replacing the E1/T1 Surge Protection Transfer Cable...............................................................................11-911.7 Replacing FE/GE Ethernet Cables of the BBU3900.................................................................................11-1011.8 Replacing FE/GE Optical Fibers of the BBU3900...................................................................................11-1011.9 Replacing CPRI Optical Fibers.................................................................................................................11-1111.10 Replacing the RRU Power Cables..........................................................................................................11-1211.11 Replacing the AISG Multicore Cable of the RRU3702/RRU3703.........................................................11-1411.12 Replacing the AISG Extension Cable of the RRU3702/RRU3703........................................................11-1511.13 Replacing the RF Jumpers of the RRU3702/RRU3703..........................................................................11-1611.14 Replacing the RF Jumper of the RRU3701C..........................................................................................11-17

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Figures

Figure 4-1 Removing the BBU case.....................................................................................................................4-4Figure 4-2 Position of the BMPT.........................................................................................................................4-5Figure 4-3 Removing the BMPT..........................................................................................................................4-6Figure 4-4 Position of the BBBI...........................................................................................................................4-7Figure 4-5 Removing the BBBI........................................................................................................................... 4-8Figure 4-6 Position of the UPEU......................................................................................................................... 4-9Figure 4-7 Removing the UPEU........................................................................................................................4-10Figure 4-8 Position of the UEIU........................................................................................................................4-11Figure 4-9 Removing the cables.........................................................................................................................4-11Figure 4-10 Removing the UEIU.......................................................................................................................4-12Figure 4-11 Position of the FAN........................................................................................................................4-13Figure 4-12 Removing the FAN.........................................................................................................................4-13Figure 4-13 Position of the UTRP......................................................................................................................4-14Figure 4-14 Removing the cables.......................................................................................................................4-15Figure 4-15 Removing the UTRP......................................................................................................................4-16Figure 4-16 Position of the USCU.....................................................................................................................4-17Figure 4-17 Removing the cable........................................................................................................................4-17Figure 4-18 Removing the USCU......................................................................................................................4-18Figure 4-19 Position of the optical module........................................................................................................4-19Figure 4-20 Removing the fibers........................................................................................................................4-20Figure 4-21 Removing the optical module.........................................................................................................4-20Figure 5-1 Loosening the screws on the main fixture..........................................................................................5-3Figure 5-2 Tightening the screws on the attachment plate...................................................................................5-3Figure 5-3 Hitting the RRU..................................................................................................................................5-4Figure 5-4 Position of the optical module............................................................................................................5-5Figure 5-5 Removing the fibers............................................................................................................................5-6Figure 5-6 Removing the optical module.............................................................................................................5-7Figure 6-1 Position of the optical module............................................................................................................6-6Figure 6-2 Removing the fibers............................................................................................................................6-7Figure 6-3 Removing the optical module.............................................................................................................6-7Figure 7-1 Position of the optical module............................................................................................................7-5Figure 7-2 Removing the fibers............................................................................................................................7-6Figure 7-3 Removing the optical module.............................................................................................................7-6

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Figure 8-1 Position of HEUA...............................................................................................................................8-2Figure 8-2 Removing the cables...........................................................................................................................8-3Figure 8-3 Removing the HEUA..........................................................................................................................8-3Figure 8-4 Position of the AC/DC power equipment in the cabinet....................................................................8-4Figure 8-5 Positions of the components...............................................................................................................8-5Figure 8-6 Disconnecting cables from the PDU..................................................................................................8-5Figure 8-7 Disconnecting cables from the PMU..................................................................................................8-6Figure 8-8 Disconnecting cables from the equipment subrack............................................................................8-6Figure 8-9 Removing the PDU.............................................................................................................................8-7Figure 8-10 Removing the PSU...........................................................................................................................8-7Figure 8-11 Removing the PMU..........................................................................................................................8-8Figure 8-12 Removing the equipment subrack....................................................................................................8-8Figure 8-13 Position of the DCDU.....................................................................................................................8-10Figure 8-14 Removing the cables.......................................................................................................................8-11Figure 8-15 Removing the DCDU.....................................................................................................................8-11Figure 8-16 Position of the AC surge protection box........................................................................................8-12Figure 8-17 Removing the cables.......................................................................................................................8-13Figure 8-18 Removing the AC surge protection box.........................................................................................8-14Figure 9-1 Removing the SLPU...........................................................................................................................9-2Figure 9-2 Position of the UELP..........................................................................................................................9-3Figure 9-3 Removing the cable............................................................................................................................9-4Figure 9-4 Removing the UELP...........................................................................................................................9-4

FiguresDBS3900 WiMAX


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Tables

Table 2-1 Maintenance tasks for the environment of the equipment room..........................................................2-2Table 2-2 Routine maintenance items for the power supply system and grounding system of the DBS3900...............................................................................................................................................................................2-4Table 2-3 Equipment maintenance tasks..............................................................................................................2-5Table 2-4 Equipment maintenance tasks..............................................................................................................2-5Table 2-5 Maintenance tasks of the cables...........................................................................................................2-6Table 2-6 Maintenance tasks of the antenna system............................................................................................2-7Table 3-1 Indicators on the BBU3900..................................................................................................................3-2Table 3-2 Indicators on the RRU3702..................................................................................................................3-5Table 3-3 Indicators on the RRU3701C...............................................................................................................3-6Table 3-4 Indicators on the RRU3703 .................................................................................................................3-7

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1 Site Maintenance Preparations

The preparations for the DBS3900 site maintenance cover the activities of obtaining siteinformation, selecting maintenance items, and arranging for tools and spare parts.

Obtaining Site InformationBefore setting out for the DBS3900 site, obtain the following site information:l The uncleared faults and alarms of the site (to make the maintenance process focused and

purposeful)l Hardware configuration of the site (to avoid improper operation)l Local conditions (to prevent maintenance from being affected by external factors such as

transportation and weather)l Spare parts (to prepare new boards or modules for replacement if required)

Selecting Maintenance ItemsBased on the specific situations of the DBS3900 site, select maintenance items from thefollowing list:l Maintaining the equipment rooml Maintaining the power system and grounding systeml Maintaining the BBUl Maintaining the RRUl Maintaining the cablesl Maintaining the antenna system

Preparing Tools and Spare Partsl Frequency test devices

The following devices are used for frequency test: the frequency meter, spectrum analyzer,connectors and cables.The oscilloscope is often used.

l Power test devices

The power test devices are used to measure and analyze the output power of the DBS3900,which determines the effect of forward coverage.

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The power meter is often used.l Antenna and feeder test devices

The antenna and feeder test devices are used to locate faults and to measure the standingwave ratio, return loss, and cable insertion loss.The Site Master is often used.

l Other materials– Multimeter, ESD wrist strap or ESD gloves, screwdriver, ESD box or bag, dust free

cloth, and wrench– Ethernet cables for commissioning– Spare parts

NOTE

Arrange for the tools and components according to the actual conditions of specified replacement.

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2 DBS3900 Routine Hardware MaintenanceTasks

About This Chapter

The tasks of the routine hardware maintenance of the DBS3900 include: the environmentalmaintenance of the equipment room, the maintenance of the power supply system and groundingsystem of the BTS, the maintenance of the BBU, the maintenance of the RRU, the maintenanceof cables, and the maintenance of the antenna system.

2.1 Environmental Maintenance Tasks of the Equipment RoomThis task enables you to maintain the environment of the DBS3900 equipment room.

2.2 Power Supply System and Grounding System Maintenance TasksThis describes the maintenance tasks for the power supply system and grounding system of theDBS3900.

2.3 Maintenance Tasks of the BBUThis describes how to check the surface of the equipment, cleanness of the equipment, andindicators.

2.4 Maintenance Tasks of the RRUThis describes how to check the surface of the equipment, cleanness of the equipment, andindicators.

2.5 Maintenance Tasks of the CablesThe maintenance tasks of cables include checking the following items: the cable distributionand routing, signal cables, Ethernet cables, optical cables, connectors, and sockets.

2.6 Maintenance Tasks of the Antenna SystemThe tasks of the maintenance of antenna system include checking towers, poles, antennas(including satellite antennas and RF antennas), and feeders.

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2.1 Environmental Maintenance Tasks of the EquipmentRoom

This task enables you to maintain the environment of the DBS3900 equipment room.

Maintenance Tasks for the Environment of the Equipment RoomTable 2-1 lists the maintenance tasks for the environment of the equipment room.

Table 2-1 Maintenance tasks for the environment of the equipment room

Maintenance Task Period Instruction ReferenceStandard

Check theenvironmentalalarms of theequipment room.

Daily Check whether thepower supply alarm,fire alarm, smokealarm, or securityalarm is generated inthe equipment room.

No power supplyalarm, fire alarm,smoke alarm, andsecurity alarm isgenerated.

Check thetemperature of theequipment room.

Every time youmaintain the site

Record thetemperature of theequipment room.

-5°C to +45°C

Check the humidityof the equipmentroom

Every time youmaintain the site

Record the reading ofthehygrothermograph.

5% RH to 85% RH

Check the lightingequipment of theequipment room

Every two months Check whether thenormal lighting andthe emergencylighting are normal.

-

Check the indoor air-conditioner

Every two months Check whether theair-conditioneroperates properly.

-

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Maintenance Task Period Instruction ReferenceStandard

Check the disasterprevention measures

Every two months Check whether thedisaster preventionmeasures, equipmentprotection, and thefire hydrants arenormal.

l The equipmentroom should beconfigured withthe carbondioxide fireextinguisher orthe dry powderfire extinguisher.Check thepressure and theexpired date ofthe fireextinguisher.

l There should beno mice, ants,flies and otherpotential dangerin the equipmentroom.

Clean the equipmentroom.

Every two months Check whether thecabinet, the shell andinterior of theequipment, the table,the floor, thewindow, and the doorare clean.

All objects in theequipment roomshould be clean andneat, and there is novisible dust on thecabinet.

2.2 Power Supply System and Grounding SystemMaintenance Tasks

This describes the maintenance tasks for the power supply system and grounding system of theDBS3900.

Maintenance Items for the Power Supply System and Grounding SystemTable 2-2 describes the routine maintenance items for the power supply system and groundingsystem of the DBS3900.



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Table 2-2 Routine maintenance items for the power supply system and grounding system of theDBS3900

Item Frequency Operation Standard

Power cable Monthly or quarterly Carefully check theconnections of powercables.

The power cables arenot aging, and thereis no corrosion on thejoints.

Voltage Monthly or quarterly Measure the voltageof the power supplyusing a multimeter.

The external inputvoltage of the BBUranges from -38.4 VDC to -57 V DC.The external inputvoltage of the RRUranges from -36 VDC to -57 V DC.

PGND cable Monthly or quarterly Verify that thePGND cable andground bar areconnected securely.

The joints are secureand corrosion free.

Earth resistance Monthly or quarterly Measure the earthresistance using anelectric earthresistance tester andrecord themeasurement.

The earth resistanceis smaller than 10ohms.

Batteries Annually Check the batteryand rectifier in thepower supply systemof each equipmentroom.

The capacity of allbatteries meets therequirement and theconnections of thebatteries are correct.The specifications ofthe rectifier meet therequirements.

2.3 Maintenance Tasks of the BBUThis describes how to check the surface of the equipment, cleanness of the equipment, andindicators.

Equipment Maintenance TasksTable 2-3 describes the equipment maintenance tasks for the BBU.




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Table 2-3 Equipment maintenance tasks


Equipment surface Monthly or quarterly Check whether thesurface of theequipment isdamaged andwhether the label ofthe equipment islegible.

-

Equipmentcleanliness

Monthly or quarterly Check whether theequipment is clean.

The surface andinside of theequipment case areclean.

indicator check Monthly or quarterly Check whether theindicators on theequipment arefunctional.

For details on themeanings of theindicators, see 3.1Powering On theBBU.

2.4 Maintenance Tasks of the RRUThis describes how to check the surface of the equipment, cleanness of the equipment, andindicators.

Equipment Maintenance TasksTable 2-4 describes the equipment maintenance tasks for the RRU.

Table 2-4 Equipment maintenance tasks


Equipment surface Monthly or quarterly Check whether thesurface of theequipment isdamaged andwhether the label ofthe equipment islegible.

-

Equipmentcleanliness

Monthly or quarterly Check whether theequipment is clean.

The surface andinside of theequipment case areclean.



2-5


Indicator check Monthly or quarterly Check whether theindicators on theequipment arefunctional.

For details on themeanings of theindicators, see 3.3Powering On theRRU.

2.5 Maintenance Tasks of the CablesThe maintenance tasks of cables include checking the following items: the cable distributionand routing, signal cables, Ethernet cables, optical cables, connectors, and sockets.

Table 2-5 lists the maintenance tasks of the cables.

Table 2-5 Maintenance tasks of the cables

Task Period Instruction Reference Standard

Cabledistribution androuting

Weekly Check whether allcable labels are clear. The labels are legible.

Check the signalcables Annually

Check the connectionof the signal cablescarefully.

l The signal cables areconnected securely.

l The signal cables areintact.

l The labels are legible.

Network cable AnnuallyCheck carefully theconnections of thenetwork cables.

l The network cables aresecurely connected.

l The network cables arenot damaged.

l The concentrators areintact.


Optical cable AnnuallyCheck carefully theconnections of theoptical cables.

l The optical cables aresecurely connected.

l The optical cables areintact.


Check theconnectors andsockets

Monthly(quarterly)

Check whether theinsulators of theconnectors and socketsare stained with dustand oil.

The insulators are clear andnot stained.




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2.6 Maintenance Tasks of the Antenna SystemThe tasks of the maintenance of antenna system include checking towers, poles, antennas(including satellite antennas and RF antennas), and feeders.

Table 2-6 lists the maintenance tasks of the antenna system.

Table 2-6 Maintenance tasks of the antenna system

Task Period Instruction Reference Standard

Towers Every half a year

Check the towerstructure, the contact ofconnection bolts, andanticorrosion andantirust status.

The towers are notdistorted, rusted orcorroded. Connection boltsare properly tightened. Thetower bases do not subside.

Poles Every half a year

Check the fasteners,stay wires, groundanchors, andanticorrosion andantirust status of poles.

The fasteners are not loose.The stay wires and groundanchors are evenly forced.The poles are not rusted orcorroded.

Antennas Every twomonths

Check the connectionbetween the antennasupport and the toweror roof, and checkwhether antennas arein the protection scopeof the lightning rod.

The antennas are protectedfrom lightning in the tilt of30° from the top of thelightning rod. The antennasupport is securelyconnected to the tower orroof.

Feeders Every twomonths

Check whether feederclips are loose andwhether feeders aredistorted or folded.

The feeder clips areinstalled securely. Thefeeders are not folded ordistorted. No copper core isexposed.



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3 Powering On and Powering Off the DBS3900

About This Chapter

When you power on the DBS3900, you need to check the status of the indicators of all theequipment. When you power off the DBS3900, you can choose the normal power-off oremergency power-off according to the actual situation.

3.1 Powering On the BBUThe BBU uses -48 V DC power. After the BBU3900 is powered on, you need to check theoperating status of each indicator and ensure that each indicator is in normal state.

3.2 Powering Off the BBUThis describes how to power off the BBU in a normal situation or in an emergency.

3.3 Powering On the RRUPower on the RRU. Determine the working state of the RRU according to the status of theindicators and ensure that the RRU is functional.

3.4 Powering Off the RRUThis section describes how to power off the RRU in a normal situation or in an emergency.

DBS3900 WiMAXSite Maintenance Guide 3 Powering On and Powering Off the DBS3900


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3.1 Powering On the BBUThe BBU uses -48 V DC power. After the BBU3900 is powered on, you need to check theoperating status of each indicator and ensure that each indicator is in normal state.

Prerequisitel The installation of the hardware and cables of the BBU is complete.l The input voltage ranges from -38.4 V DC to -57 V DC.

Procedure

Step 1 Set the circuit breaker on the external power supply equipment that provides power to the BBUto ON.

Step 2 Turn on the power switch of the BBU.

Step 3 Check the status of the indicators on the boards and modules of the BBU. Table 3-1 describesthe meanings of the indicators.

Table 3-1 Indicators on the BBU3900

Board/Module

Indicator Color State Description

UPEU RUN Green On The power board isworking properly.

Off The power board stopsworking.

BMPT,USCU,UTRP

RUN Green On There is power input, butthe board is faulty.

Off There is no power input,or the board is faulty.

Blinking at 0.5 Hz(on for 1s and off for1s)

The board is workingproperly.

Blinking at 4 Hz (onfor 0.125s and off for0.125s)

The board is beingloaded.

ALM Red On An alarm is generated,and the board needs to bereplaced.

Off No alarm is generated.

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Board/Module

Indicator Color State Description


An alarm is generated,but you cannotdetermine that the boardneeds to be replaced.This alarm may begenerated by a faultyboard or port.

ACT Green On Active

Off Standby

BBBI RUN Green On There is power input, butthe board is faulty.

Off There is no power input,or the board is faulty.


The board is working asconfigured.

Blinking at 4 Hz (onfor 0.125s and off for0.125s)

The board is loading ornot started.

ALM Red On An alarm is generated,and the board needs to bereplaced.

Off No alarm is generated.


An alarm is generated,but you cannotdetermine that the boardneeds to be replaced.This alarm may begenerated by a faultyboard or port.

ACT Green On The board is working.

Off The board is notworking.

FAN STATE Green Blinking at 4 Hz (onfor 0.125s and off for0.125s)

The board is notregistered, and no alarmis generated.


The board is workingproperly.

Red On An alarm is generated.



3-3

Step 4 Proceed with the next step according to the status of the indicator.

If... Then...

The boards and modules of the BBU areworking properly,

The power-on procedure is complete.

Faults occur in the BBU, Record the fault status, turn off the powerswitch, rectify the fault, and then go to Step1.

----End

3.2 Powering Off the BBUThis describes how to power off the BBU in a normal situation or in an emergency.

Procedure

Step 1 Determine the method for powering off the BBU according to the actual situation.

If... Then...

The BBU needs to be powered off when youswap the equipment or anticipate a territorialpower outage.

Turn off the power switch of the BBU, andthen turn off the power switch of the externalpower supply to the BBU.

The BBU needs to be powered off in anemergency, such as fire, smoke, or waterimmersion,

Turn off the power switch of the externalpower supply to the BBU, and then turn offthe power switch of the BBU.

----End

3.3 Powering On the RRUPower on the RRU. Determine the working state of the RRU according to the status of theindicators and ensure that the RRU is functional.

Prerequisitel Ensure that the installation of the RRU and the cables is correct and complete.l The input voltage ranges from -36 V DC to -57 V DC.




Issue 02 (2010-10-22)

Context

CAUTIONThe RRU must be powered on within 24 hours after being unpacked or after being powered offfor maintenance.

Procedure

Step 1 Connect the power cable of the RRU to the output end of the external power equipment, andthen turn on the power switch to power on RRU.

DANGERAfter the RRU is powered on, do not look directly at the beam from the optical module withouttaking the necessary eye protection measures.

Step 2 Wait for three to five minutes and then check the status of indicators on the RRU. Table 3-2lists the meanings of the indicators on the RRU3702. Table 3-3 lists the meanings of theindicators on the RRU3701C. Table 3-4 lists the meanings of the indicators on the RRU3703.

Table 3-2 Indicators on the RRU3702

Indicator

Color Status Description

RUN Green On There is power input but the board isfaulty.

Off No power input is available.

Blinks at 0.5 Hz (onfor 1s, off for 1s)

The board is working normally.

Blinks at 4 Hz (on for0.125s, off for 0.125s)

The board is being loaded or not started.

ALM Red On An alarm (except the standing-wavealarm) is generated and the board mustbe replaced.

Off No alarm (except the standing-wavealarm) is generated.


An alarm (except the standing-wavealarm) is generated. Whether the boardneeds to be replaced is uncertain. It maybe caused by a fault on the related boardor port.



3-5

Indicator


TX_ACT Green On The board is working properly (thetransmit channel is active).

Off The software version is being verified orthe version verification fails.


The version verification succeeds but thetransmit channel is inactive.

VSWR Red On A standing wave alarm is generated.

Off No standing wave alarm is generated.

CPRI0 Green On The optical module is in position.

Off The optical module is out of position.

CPRI1 Green On The optical module is in position.

Off The optical module is out of position.

Table 3-3 Indicators on the RRU3701C

Indicator Color Status Meaning

RUN Green On The system ispowered on.

Off The system is notpowered on.

Blinks at 4 Hz (on for0.125s, off for0.125s)

The module is beingloaded or is notstarted.


The module isworking properly.

ALM Red On An alarm isgenerated and thecorrespondingmodule must bereplaced.

Off There is no alarm.




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Indicator Color Status Meaning


An alarm isgenerated. Butwhether the boardneeds to be replacedis uncertain. It maybe caused by a faulton the related boardor port.

ACT Green On The module isworking properly.

Off The module is notconfigured and notconnected to theBBU.


The configuration issuccessful, but thetransmit channel isblocked.

Table 3-4 Indicators on the RRU3703

Indicator


RUN Green On There is power input but the board isfaulty.

Off There is no power input.


The board is working normally.

Blinks at 4 Hz (on for0.125s, off for 0.125s)

The board is being loaded or not started.

ALM Red On An alarm (except the standing-wavealarm) is generated and the board mustbe replaced.

Off No alarm (except the standing-wavealarm) is generated.


An alarm (except the standing-wavealarm) is generated. Whether the boardneeds to be replaced is uncertain. It maybe caused by a fault on the related boardor port.



3-7

Indicator


ACT Green On The board is working normally (thesector is activated and the transmitchannel is active).

Off The software version is being verified orthe version verification fails.


The version verification succeeds but thetransmit channel is inactive (the sector isnot activated).

VSWR Red On A standing wave alarm is generated.

Off No standing wave alarm is generated.

CPRI0/IR0

Red andgreen

On (green) The CPRI link is functional.

On (red) An optical module receiving exceptionalarm is generated.

Off The optical module is not in position.

CPRI1/IR1

Red andgreen

On (green) The CPRI link is functional.

On (red) An optical module receiving exceptionalarm is generated.

Off The optical module is not in position.

Step 3 Proceed with the next step according to the status of the indicator.

If... Then...

The RRU is working properly, The power-on procedure is complete.

The RRU is faulty, Record the faulty status, turn off the power switch, rectifythe fault, and then go to Step 1.

----End

3.4 Powering Off the RRUThis section describes how to power off the RRU in a normal situation or in an emergency.

ContextThe RRU can be powered off in a normal situation or in an emergency. The handling methodsin these two situations are the same.




Issue 02 (2010-10-22)

l In a normal situation: The RRU needs to be powered off when you swap the equipment oranticipate a territorial power outage.

l In an emergency: The RRU needs to be powered off in an emergency, such as fire, smoke,or water immersion.

Procedure

Step 1 Turn off the switch of the external power supply equipment of the RRU.

NOTE

The external power supply equipment of the RRU is the APM or DCDU. Thus, you need to turn off thepower switch of the RRU through the APM or DCDU.

----End



3-9

4 Replacing the Components of the BBU3900

About This Chapter

The faulty BBU3900 components must be replaced promptly. The components that can bereplaced are the BBU case, boards, modules, and optical module. All boards are hot-swappable.When boards are running, abnormal power-off of boards will not cause damage to the hardwareand software.

4.1 Replacing the Case of the BBU3900The case of the BBU3900 consists of the outer case and the Universal BBU Subrack BackplaneType C (2U) (BSBC). The BSBC is the backplane of the BBU3900, which provides powersupply, clock, and the data of the control panel and service panel for each board.

4.2 Replacing the BMPTThe BWA Main Processing&Transmission Unit (BMPT) is the main processing andtransmission board of the BBU3900. The BMPT implements centralized management over theboards of the system.

4.3 Replacing the BBBIThe BWA BaseBand Processing and Radio Interface Unit (BBBI) is the baseband processingand radio interface board of the BBU3900, which processes baseband signals and provides RFinterfaces. There are two types of BBBI board: 8 HP and 4 HP. The procedures for replacingthe two types of BBBIs are the same. The following procedure for replacing the 4 HP BBBI isgiven as an example.

4.4 Replacing the UPEUThe Universal Power and Environment Interface Unit (UPEU) is the power and environmentmonitoring module of the BBU3900. The UPEU supports the -48 V DC power input and providespower to the boards in the BBU.

4.5 Replacing the UEIUThe Universal Environment Interface Unit (UEIU) is the environment interface unit of theBBU3900. The UEIU reports alarms and information of the environment monitoring equipmentto the BMPT.

4.6 Replacing the FANThe FAN module of the BBU is used to cool the BBU3900. The FAN and the air inlet box forman air duct for forcible ventilation and heat dissipation.

DBS3900 WiMAXSite Maintenance Guide 4 Replacing the Components of the BBU3900


4-1

4.7 Replacing the UTRPThe Universal Transmission Processing Unit (UTRP) is the extended transmission board of theBBU3900 and provides eight E1/T1 interfaces.

4.8 Replacing the USCUThe Universal Satellite card and Clock Unit (USCU) is the extended satellite card and clock unitof the BBU. The USCU receives the GPS, RGPS, BITS, and M-1PPS clock signals, and receivesor transmits 1PPS + TOD clock signals.

4.9 Replacing the Optical ModulesThe optical module provides an interface for photoelectric conversion, which enables thetransmission between the BBU and other equipment through the optical fiber. Replacing theoptical modules requires removing the optical fibers. This disrupts the CPRI transmission signal.The procedures of replacing optical modules in different BS equipment are the same. Thefollowing section describes how to replace an optical module in the BBU.

4 Replacing the Components of the BBU3900DBS3900 WiMAX



Issue 02 (2010-10-22)

4.1 Replacing the Case of the BBU3900The case of the BBU3900 consists of the outer case and the Universal BBU Subrack BackplaneType C (2U) (BSBC). The BSBC is the backplane of the BBU3900, which provides powersupply, clock, and the data of the control panel and service panel for each board.

Prerequisitel The required tools and materials are ready. The tools and materials are the ESD wrist strap

or ESD gloves, M6 screwdriver, and ESD box or bag.l The quantity and models of the components to be replaced are confirmed and new cases

are ready.l Keep the keys ready for use after you obtain site admission.

ContextReplacing the BBU case disrupts all the services carried by the BS. Therefore, the BBU casemust be replaced within 20 minutes.

Procedure

Step 1 Inform the administrator of the M2000 that the BBU case needs to be replaced and ask theadministrator to perform the following operations:1. Obtain the BTS data configuration file by referring to Backing Up Configuration Data.2. If necessary, transfer the services carried by the boards in the BBU.3. Change the ESN to that of the new BBU case by referring to DHCP Parameter Preparation.

Step 2 Power off the BBU by referring to 3.2 Powering Off the BBU.

Step 3 Wear the ESD wrist strap or ESD gloves.

CAUTIONWhen performing the replacement, take proper ESD prevention measures, for example, wearESD wrist straps or gloves to prevent boards, modules, and electronic components from beingdestroyed by static discharge from the human body.

Step 4 Record the connection positions of all the cables connected to the boards in the BBU case.

Step 5 Disconnect the cables from the boards in the BBU case.

Step 6 Loosen the four M6 screws on the BBU case and then remove the BBU case, as shown in Figure4-1.



4-3

Figure 4-1 Removing the BBU case

NOTEThe procedure of replacing the BBU case with regularly installed mounting ears and that of replacing theBBU case with reversely installed mounting ears are the same. In the preceding figure, the BBU is in a 19-inch space and the mounting ears are regularly installed.

Step 7 Remove all the boards in the faulty BBU case, install the boards to the new BBU case, and theninstall filler panels to the idle slots.

Step 8 Install the new BBU case, fasten the screws on the case [torque: 2 N.m (17.70 lbf.in.)], and theninstall the cables according to the recorded positions.

NOTEIf the mounting ears of the BBU case to be replaced are reversely installed, you need to install the mountingears to the new BBU case in the same way. See the DBS3900 WiMAX Quick Installation Guide(RRU3702&RRU3703) for the procedure of reversely installing the mounting ears.

Step 9 Power on the BBU by referring to 3.1 Powering On the BBU.

Step 10 Determine whether the new BBU case is functional according to the status of indicators of theboards in the BBU.

NOTE

For description of the indicators, see DBS3900 WiMAX Hardware Description.

Step 11 Inform the administrator of the M2000 that the hardware replacement is complete and ask theadministrator to confirm that the boards and modules in the BBU do not generate any alarms.

Step 12 Remove the ESD wrist strap or gloves and put the tools away.

----End

Postrequisitel Put the replaced components into the ESD bag and then put the bag into the cardboard box

filled with foam.

l Fill the fault card to record the information of the replaced components.

l Contact the local Huawei office to handle the faulty components.




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4.2 Replacing the BMPTThe BWA Main Processing&Transmission Unit (BMPT) is the main processing andtransmission board of the BBU3900. The BMPT implements centralized management over theboards of the system.


or ESD gloves, M3 screwdriver, and ESD box or bag.l The quantity and models of the boards to be replaced are confirmed.l Keep the keys ready for use after you obtain site admission.

Contextl Figure 4-2 shows the position of the BMPT in the BBU.

Figure 4-2 Position of the BMPT

NOTEThis figure is only for your reference. Determine the actual configuration positions according to the onsitecondition.

l The board is hot-swappable.l If no backup BMPT is configured, replacing the BMPT disrupts all the services carried by

the BS. Therefore, the BMPT must be replaced within 20 minutes.

Procedure

Step 1 Inform the administrator of the M2000 that the BMPT needs to be replaced and ask theadministrator to perform the following operations:1. Obtain the BTS data configuration file by referring to Backing Up Configuration Data.2. If necessary, transfer the services carried by the boards in the BBU.





4-5

Step 3 Remove the board.1. Record the connection positions of all the cables connected to the board and then remove

these cables.2. Loosen the two M3 screws on the panel, lift the ejector levers on the faulty board, and

remove the faulty board from the slot, as shown in Figure 4-3.

Figure 4-3 Removing the BMPT

2

1

3. Put the removed board in an ESD bag.

Step 4 Install the new board.1. Insert the new board into the slot of the original faulty board.2. Press the ejector levers on the panel of the new board and fasten the screws on both sides

of the panel of the board [torque: 0.6 N.m (5.31 lbf.in.)].3. Install the cables.

Step 5 Inform the administrator of the M2000 that the hardware replacement is complete and ask theadministrator to perform the following operations:1. Run the DLD CFGFILE command to download the backup configuration data to the new

BMPT.2. Run the ACT CFGFILE command to activate the configuration data.3. Run the DSP BRDVER command to check whether BootROM version and software

version of the new board are correct.

If the software version is incorrect, upgrade the BS software. For details of the procedures,see the DBS3900 WiMAX Upgrade Guide.

Step 6 Determine whether the new BMPT is functional according to the status of the indicators.1. In the normal state, the RUN indicator of the board blinks at 0.5 Hz (on for 1s and off for

1s) and the ALM indicator is off.2. The ACT indicator on the active board is on.

NOTEFor description of the indicators, see DBS3900 WiMAX Hardware Description.


----End


filled with foam.




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4.3 Replacing the BBBIThe BWA BaseBand Processing and Radio Interface Unit (BBBI) is the baseband processingand radio interface board of the BBU3900, which processes baseband signals and provides RFinterfaces. There are two types of BBBI board: 8 HP and 4 HP. The procedures for replacingthe two types of BBBIs are the same. The following procedure for replacing the 4 HP BBBI isgiven as an example.


or ESD gloves, M3 screwdriver, and ESD box or bag.

l The quantity and models of the boards to be replaced are confirmed.

l Admission to the site is obtained and the keys to the site are ready.

Contextl Figure 4-4 shows the position of the BBBI in the BBU.

Figure 4-4 Position of the BBBI

NOTEThis figure is only for your reference. Determine the actual configuration positions according to the onsitecondition.

l The board is hot-swappable.

l Replacing the BBBI disrupts all the services carried by the BS. Therefore, the BBBI mustbe replaced within 20 minutes.

l The procedure described here is applicable to replacing BBBIs of the same type as the 8HP or 4 HP BBBI. See DBS3900 WiMAX Reconfiguration Guide to replace BBBIs of adifferent type from the 8 HP or 4 HP BBBI.

Procedure

Step 1 Inform the administrator of the M2000 that the BBBI needs to be replaced. If necessary, ask theadministrator to transfer the services carried by the board.




4-7


Step 3 Remove the board.

1. Record the connection positions of all the cables connected to the board and then removethese cables.

2. Loosen the two M3 screws on the panel, lift the ejector levers on the faulty board, andremove the faulty board from the slot, as shown in Figure 4-5.

Figure 4-5 Removing the BBBI

2

1

3. Put the removed board in an ESD bag.

Step 4 Install the new board.

1. Insert the new board into the slot of the original faulty board.

2. Press the ejector levers on the panel of the new board and fasten the screws on both sidesof the panel of the board [torque: 0.6 N.m (5.31 lbf.in.)].

3. Install the cables.

Step 5 Inform the administrator of the M2000 that the hardware replacement is complete and ask theadministrator to run the DSP BRDVER command to check whether the BootROM version andsoftware version of the new board are correct.

If the software version is incorrect, upgrade the BS software. For details of the procedures, seethe DBS3900 WiMAX Upgrade Guide.

Step 6 Determine whether the new BBBI is functional according to the status of the indicators. In thenormal state, the RUN indicator of the board blinks at 0.5 Hz (on for 1s and off for 1s).

NOTE


Step 7 Remove the ESD wrist strap or ESD gloves and put the tools away.

----End




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Postrequisitel Put the replaced components into an ESD bag and then put the bag into a cardboard box

filled with foam.l Fill the fault card to record the information of the replaced components.l Contact the local Huawei office to handle the faulty components.

4.4 Replacing the UPEUThe Universal Power and Environment Interface Unit (UPEU) is the power and environmentmonitoring module of the BBU3900. The UPEU supports the -48 V DC power input and providespower to the boards in the BBU.


or ESD gloves, M3 screwdriver, and ESD box or bag.l The quantity and models of the modules to be replaced are confirmed.l Keep the keys ready for use after you obtain site admission.

Contextl Figure 4-6 shows the position of the UPEU in the BBU.

Figure 4-6 Position of the UPEU

UPEU

l If no backup UPEU is configured, replacing the UPEU powers off the BBU and disrupts

services. Therefore, the UPEU must be replaced within 10 minutes.

Procedure

Step 1 Inform the administrator of the M2000 that the UPEU needs to be replaced. If necessary, askthe administrator to back up or transfer the services carried by the module.





4-9

WARNINGWhen performing the replacement, take proper ESD prevention measures, for example, wearESD wrist straps or gloves to prevent boards, modules, and electronic components from beingdestroyed by static discharge from the human body.

Step 4 Remove the module.1. Record the connection positions of all the cables connected to the module and then

disconnect these cables from the module.2. Loosen the two M3 screws on the panel, lift the ejector levers on the faulty module and

remove the faulty module from the slot, as shown in Figure 4-7.

Figure 4-7 Removing the UPEU

12

3. Put the removed module in an ESD bag.

Step 5 Install the new module.1. Insert the new module into the slot of the original faulty module.2. Press the ejector levers on the panel of the new module and fasten the screws on both sides

of the panel of the new module [torque: 0.6 N.m (5.31 lbf.in.)].3. Install the cables according to the recorded installation positions.

Step 6 Power on the BBU by referring to 3.1 Powering On the BBU.

Step 7 Determine whether the new UPEU is functional according to the status of the indicators. In thenormal state, the RUN indicator of the UPEU is on.

NOTE


Step 8 Inform the administrator of the M2000 that the hardware replacement is complete and ask theadministrator to confirm that the boards and the module do not generate any alarms.


----End






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4.5 Replacing the UEIUThe Universal Environment Interface Unit (UEIU) is the environment interface unit of theBBU3900. The UEIU reports alarms and information of the environment monitoring equipmentto the BMPT.



Contextl Figure 4-8 shows the position of the UEIU in the BBU.

Figure 4-8 Position of the UEIU

UEIU

l The board is hot-swappable.l Replacing the UEIU disrupts the monitoring of external equipment. Therefore, the UEIU

must be replaced in five minutes.

ProcedureStep 1 Wear the ESD wrist strap or ESD gloves.


Step 2 Record the connection positions of all the cables connected to the board.

Step 3 Disconnect the monitoring cables and alarm cables from the UEIU, as shown in Figure 4-9.

Figure 4-9 Removing the cables



4-11

Step 4 Loosen the two screws on the panel by using the M3 screwdriver and then remove the UEIU,as shown in Figure 4-10.

Figure 4-10 Removing the UEIU

21

Step 5 Install the new board, fasten the screws on the board [torque: 0.6 N.m (5.31 lbf.in.)], and theninstall the cables.

Step 6 Inform the administrator of the M2000 that the hardware replacement is complete and ask theadministrator to confirm that the board does not generate any alarms.


----End


filled with foam.



4.6 Replacing the FANThe FAN module of the BBU is used to cool the BBU3900. The FAN and the air inlet box forman air duct for forcible ventilation and heat dissipation.



l The quantity and models of the modules to be replaced are confirmed.

l Keep the keys ready for use after you obtain site admission.

Contextl Figure 4-11 shows the position of the FAN in the BBU.




Issue 02 (2010-10-22)

Figure 4-11 Position of the FAN

FAN

l The FAN is hot-swappable.

l Replacing the FAN may affect the ventilation and heat dissipation of the BBU and causean increase in temperature. In this case, an overtemperature alarm may be generated, butservices are not affected. Therefore, the replacement must be implemented in three minutes.

Procedure



Step 2 Loosen the two M3 screws on the panel and then remove the FAN, as shown in Figure 4-12.

Figure 4-12 Removing the FAN

1 2

CAUTIONIf one or more fans in the FAN are running, do not touch the running fans when removing theFAN.

Step 3 Install the new module, fasten the screws on the new module [torque: 0.6 N.m (5.31 lbf.in.)],and then install the cables.



4-13

Step 4 Determine whether the new module is functional according to the status of indicators. In thenormal state, the START indicator of the FAN blinks at 0.5 Hz (on for 1s and off for 1s).

NOTE


Step 5 Inform the administrator of the M2000 that the replacement is complete and ask the administratorto confirm that the module does not generate any alarms.


----End



4.7 Replacing the UTRPThe Universal Transmission Processing Unit (UTRP) is the extended transmission board of theBBU3900 and provides eight E1/T1 interfaces.



Contextl Figure 4-13 shows the position of the UTRP in the BBU.

Figure 4-13 Position of the UTRP

RUNALMACT

E1/T1(0-3)

UTRP

E1/T1(4-7)

UTRP


Procedure

Step 1 Inform the administrator of the M2000 that the UTRP needs to be replaced. If necessary, askthe administrator to back up or transfer the services carried by the board.




Issue 02 (2010-10-22)




Step 4 Disconnect the transmission cable from the UTRP. If the surge protection board is configured,you need to disconnect the surge protection transfer cable, as shown in Figure 4-14.


Step 5 Loosen the two M3 screws on the panel and then remove the UTRP, as shown in Figure 4-15.



4-15

Figure 4-15 Removing the UTRP

1

21

Step 6 Ensure that the settings of the DIP switches on the new board are consistent with the settings ofthe removed board. If necessary, refer to UTRP for the information of the DIP switches.


Step 8 Determine whether the new board is working properly according to the status of indicators. Inthe normal state, the RUN indicator of the board blinks at 0.5 Hz (on for 1s and off for 1s).

NOTE


Step 9 Inform the administrator of the M2000 that the replacement is complete and ask the administratorto confirm that the board does not generate any alarms.


----End


filled with foam.




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l Fill the fault card to record the information of the replaced components.l Contact the local Huawei office to handle the faulty components.

4.8 Replacing the USCUThe Universal Satellite card and Clock Unit (USCU) is the extended satellite card and clock unitof the BBU. The USCU receives the GPS, RGPS, BITS, and M-1PPS clock signals, and receivesor transmits 1PPS + TOD clock signals.


or ESD gloves, screwdriver, and ESD box or bag.l The quantity and models of the boards to be replaced are confirmed.l Keep the keys ready for use after you obtain site admission.

Contextl Figure 4-16 shows the position of the USCU in the BBU.

Figure 4-16 Position of the USCU

USCUUSCUALMALMRUNRUN

ACTACT

TOD1TOD1

GPSRX+ RX- TX+ TX-

BITSGR

EEN IN

YELLO

W O

UT

RGPS

M-1PPS

TOD0

GPSRX+ RX- TX+ TX-

BITSGR

EEN IN

YELLO

W O

UT

RGPS

M-1PPS

TOD0

1S+ 1S- GND PWR1S+ 1S- GND PWR

USCU


ProcedureStep 1 Wear the ESD wrist strap or ESD gloves.



Step 3 Disconnect the GPS clock signal cable from the USCU, as shown in Figure 4-17.

Figure 4-17 Removing the cable



4-17

Step 4 Loosen the two M3 screws on the panel and then remove the USCU, as shown in Figure 4-18.

Figure 4-18 Removing the USCU

2

1


Step 6 Determine whether the new board functions properly according to the status of the indicators.In the normal state, the RUN indicator of the board blinks at 0.5 Hz (on for 1s and off for 1s).

NOTE


Step 7 Inform the administrator of the M2000 that the replacement is complete and ask the administratorto perform the following operations:1. Load and activate the software version of the USCU.2. Confirm that the board does not generate any alarms.


----End





or ESD gloves, and ESD box or bag.




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l The quantity and models of the faulty optical modules are confirmed, and new opticalmodules are ready.

l Keep the keys ready for use after you gain site admission.

Contextl Figure 4-19 shows the position of the optical module on the board.

Figure 4-19 Position of the optical module

1

(1) Optical module

l The optical modules are hot-swappable.l You need to disconnect the optical fibers when replacing the faulty optical module.

Therefore, services carried on the optical fibers are disrupted during the replacement.

CAUTIONThe RRU may restart when you replace the optical module. Do not activate or deactivate theRRU if no antenna or matched load is connected to the RRU.

Procedure



Step 2 Prepare optical modules of the same type as the faulty modules according to the labels on theoptical modules.

Step 3 Record the positions of the optical modules on the boards.

Step 4 Press the latch on the connector of the optical fiber, and then remove the connector from thefaulty optical module, as shown in Figure 4-20.



4-19

Figure 4-20 Removing the fibers

WARNINGAfter removing the optical fibers from the optical modules, do not look directly at the opticalmodules without taking the necessary eye-protection measures.

Step 5 Turn the ring-pull on the faulty optical module outwards. Hold the ring-pull and take the faultyoptical module out of the slot to remove it from the BBU, as shown in Figure 4-21.

Figure 4-21 Removing the optical module

12

Step 6 Install the new optical module to the BBU.

Step 7 Remove the dustproof caps from the optical module and the optical fiber connector, and thenconnect the optical fiber connector to the new optical module.

Step 8 Observe the status of indicators of the boards and determine whether the transmission is normal.

NOTE





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----End





4-21

5 Replacing the Components of the RRU3702/RRU3703

About This Chapter

The faulty RRU3702/RRU3703 components must be replaced promptly. The components thatcan be replaced are the RRU3702/RRU3703 module, and the optical module.

5.1 Replacing the RRU3702/RRU3703As the remote RF unit of the Huawei WiMAX base station, the RRU3702/RRU3703 works withmodules such as the BBU to constitute a distributed base station system. The procedures forreplacing the RRU3702 and the RRU3703 are the same. The following section describes howto replace the RRU3702.


DBS3900 WiMAXSite Maintenance Guide 5 Replacing the Components of the RRU3702/RRU3703


5-1

5.1 Replacing the RRU3702/RRU3703As the remote RF unit of the Huawei WiMAX base station, the RRU3702/RRU3703 works withmodules such as the BBU to constitute a distributed base station system. The procedures forreplacing the RRU3702 and the RRU3703 are the same. The following section describes howto replace the RRU3702.


or ESD gloves, M4 screwdriver, waterproof tape, and insulation tape.l The quantity of RRUs to be replaced is confirmed and new RRUs are ready.

Contextl Replacing the RRU3702/RRU3703 disrupts the services carried by the RRU.l If the new RRU3702/RRU3703 and the replaced RRU3702/RRU3703 have the same

software version, restoring services takes about 30 minutes after the new RRU3702/RRU3703 is powered on.

l If the software of the original RRU3702 is V300R003C00 and it is replaced with anRRU3702 whose software is in an earlier version, the software of the new RRU3702 isautomatically upgraded to V300R003C00. In this case, if the transmission rate over theCPRI port of the new RRU3702 is 3.84 Gbit/s, restoring services takes about 35 minutesafter the new RRU2702 is powered on. The maximum time for restoring services is about55 minutes.

l See DBS3900 WiMAX Reconfiguration Guide to replace RRU3702 with RRU3703.

NOTESee the DBS3900 WiMAX Quick Installation Guide (RRU3702&RRU3703) to install new RRU3702s orRRU3703s.

Procedure

Step 1 Inform the administrator of the M2000 that the RRU needs to be replaced. If necessary, ask theadministrator to transfer the services carried by the RRU.

Step 2 Power off the RRU by referring to 3.4 Powering Off the RRU.



Step 4 Use the M4 screwdriver to loosen the six screws on the cover plate of the cabling cavity andthen open the cabling cavity of the RRU.


5 Replacing the Components of the RRU3702/RRU3703DBS3900 WiMAX



Issue 02 (2010-10-22)

Step 6 Disconnect the cables connected to the bottom of the RRU cabling cavity.

Step 7 Use the M4 screwdriver to loosen the captive screws on the two spring plates on the main fixture,as shown in Figure 5-1.

Figure 5-1 Loosening the screws on the main fixture

Step 8 Use the M4 screwdriver to tighten the two screws on the transfer piece of the RRU [torque: 4.8N.m (42.48 lbf.in.)], as shown in Figure 5-2. Lift up the screws to loosen the connection betweenthe transfer piece and the main fixture. Then, lift up the RRU to remove it.

Figure 5-2 Tightening the screws on the attachment plate

WARNINGDo not lift up the screws by force. You can use a rubber hammer to hit the bottom of the RRUuntil the connection between the transfer piece and the main fixture is loosened, as shown inFigure 5-3.



5-3

Figure 5-3 Hitting the RRU

Step 9 Install the new RRU, tighten the captive screws on the two spring plates on the main fixture[torque: 4.8 N.m (42.48 lbf.in.)], and then take waterproof measures.

Step 10 Connect the cables back to the RRU.

Step 11 Close the cabling cavity of the RRU and tighten the screws on the cover plate of the cablingcavity [torque: 1.4 N.m (12.39 lbf.in.)].

Step 12 Power on the RRU by referring to 3.3 Powering On the RRU.

Step 13 Determine whether the new RRU is functional according to the status of the indicators on theRRU. In the normal state, the RUN indicator of the RRU blinks at 0.5 Hz (on for 1s and off for1s).

NOTE


Step 14 Inform the administrator of the M2000 that the hardware replacement is complete and ask theadministrator to confirm that no alarms are generated.

Step 15 Remove the ESD wrist strap or ESD gloves and put the tools away.

----End

Postrequisitel Put the replaced RRU into an ESD bag and then put the bag into a cardboard box filled

with foam.l Fill the fault card to record the information of the replaced components.l Contact the local Huawei office to handle the faulty components.




Issue 02 (2010-10-22)



or ESD gloves, and ESD box or bag.l The quantity and models of the faulty optical modules are confirmed, and new optical

modules are ready.l Keep the keys ready for use after you gain site admission.



1

(1) Optical module

l The optical modules are hot-swappable.l You need to disconnect the optical fibers when replacing the faulty optical module.

Therefore, services carried on the optical fibers are disrupted during the replacement.


Procedure




5-5











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12




NOTE



----End





5-7

6 Replacing the Components of the Fan-Cooling RRU3701C

About This Chapter

Faulty RRU3701C components must be replaced promptly. The components that can be replacedfor the fan-cooling RRU3701C are the RRU3701C module, case, fan subrack, and opticalmodule.

6.1 Replacing the Fan-Cooling RRU3701CIf the RRU3701C is faulty, replace the RRU3701C.

6.2 Replacing the RRU3701C CaseIf the case of the fan-cooling RRU3701C is faulty, replace the case.

6.3 Replacing the Fan Subrack of the RRU3701CIf the fan subrack of the RRU3701C is faulty, replace the fan subrack.


DBS3900 WiMAXSite Maintenance Guide 6 Replacing the Components of the Fan-Cooling RRU3701C


6-1

6.1 Replacing the Fan-Cooling RRU3701CIf the RRU3701C is faulty, replace the RRU3701C.

Prerequisitel The quantity and model of the faulty RRU3701Cs are confirmed and the new RRU3701Cs

are ready.l The installation position of each RRU3701C is recorded.l The position of each screw on the RRU3701Cs is recorded.l The ports to which all RRU3701C cables are connected are recorded.l The sectors of the RRU3701C are deactivated.l The required tools and materials are ready. The tools and materials are the ESD wrist strap

or ESD gloves, Phillips screwdriver, flat-head screwdriver, ESD box or bag, dust free cloth,and key to the cabinet door.

ContextAs a remote RF unit of the distributed base station, the RRU3701C works with other modulessuch as the BBU to constitute the DBS3900 base station system.

Replacing an RRU3701C disrupts all the services carried by the RRU3701C.

It takes about 30 minutes to replace a fan-cooling RRU3701C. In this time, the cables aredisconnected from the faulty RRU3701C and then connected to the new RRU3701C, and theservices are resumed.

CAUTIONl Take proper ESD prevention measures, for example, wear ESD wrist straps or gloves to

prevent boards, modules, and electronic components from being destroyed by staticdischarge from the human body.

l Use an optical fiber clip to remove the connector of the optical fiber on the RRU3701Cside.

NOTE

See the DBS3900 WiMAX Quick Installation Guide (RRU3701C) to install new RRU3701Cs.

The procedure described here is applicable to replacing RRUs of the same type as theRRU3701C. See DBS3900 WiMAX Reconfiguration Guide to replace RRUs of a different typefrom the RRU3701C.

Procedure

Step 1 Turn off the power switch of the external power supply of the RRU3701C by referring to 3.4Powering Off the RRU.

Step 2 Open the case of the RRU3701C.

6 Replacing the Components of the Fan-Cooling RRU3701CDBS3900 WiMAX



Issue 02 (2010-10-22)

Step 3 Open the cover of the cabling cavity, disconnect all the cables from the faulty RRU3701C, andtake insulation measures for the cables.

Step 4 Loosen the two captive screws at the bottom of the case.

Step 5 Unfasten the tabs on the attachment plates from the anchor slots on the case, and then removethe RRU3701C from the case.

Step 6 Remove the four screws that fasten the upper and lower attachment plates.

Step 7 Get the new RRU3701C.

Step 8 Use the four screws to fasten the attachment plates to the new RRU3701C.

Step 9 Fasten the RRU3701C module onto the case by fitting the tabs on the attachment plate into theanchor slots.

Step 10 Tighten the two captive screws at the bottom of the case.

Step 11 Connect all the cables to the new RRU3701C and fix the cover of the cabling cavity.

Step 12 Turn on the power switch of the external power supply of the RRU3701C. Then, power on theRRU3701C by referring to 3.3 Powering On the RRU.

Step 13 Lock the door of the RRU3701C case.

----End

Postrequisite

Check the following items after replacing the faulty RRU3701C:l All the cables on the new RRU3701C are correctly connected.l Each screw is fastened in the correct position on the new RRU3701C.l The new RRU3701C is functional after being powered on and all the services are normal.l Check the BIOS version and upgrade the version at the BBU3900 side.Contact the local Huawei office to handle the faulty RRU3701C.

6.2 Replacing the RRU3701C CaseIf the case of the fan-cooling RRU3701C is faulty, replace the case.

Prerequisite

l The new RRU3701C case is ready.l The sectors of the RRU3701C are deactivated.l A cross screwdriver and the key to the door of the case are ready.

Context

Replacing the case of an RRU3701C may interrupt all the services carried by the RRU3701C.

It takes about 20 minutes to replace the RRU3701C case.



6-3

Procedure




Step 4 Loosen the two captive screws at the bottom of the case.

Step 5 Unfasten the tabs on the attachment plate from the anchor slots on the case, and then removethe RRU3701C from the case.

Step 6 Remove the four screws used for fixing the faulty case, and then remove the faulty case.

Step 7 Install the new case by referring to the DBS3900 WiMAX Quick Installation Guide.

Step 8 Fasten the RRU3701C module onto the case by fitting the tabs on the attachment plate into theanchor slots.

Step 9 Tighten the two captive screws at the bottom of the case.




----End

PostrequisiteCheck the following items after replacing the faulty RRU3701C case:l The two tabs at the top of the RRU3701C are fitted into the anchor slots on the case.l The four bolts used for fixing the case are tightened.l The door of the case is locked.Contact the local Huawei office to handle the faulty RRU3701C case.

6.3 Replacing the Fan Subrack of the RRU3701CIf the fan subrack of the RRU3701C is faulty, replace the fan subrack.

Prerequisitel The new fan subrack of the RRU3701C rack is ready.l The cross screwdriver, ESD wrist strap or gloves, and key to the door of the case are ready.

ContextReplacing the fan subrack of an RRU3701C may interrupt all the services carried by theRRU3701C.




Issue 02 (2010-10-22)

Procedure



Step 3 Loosen the captive screws on the cover of the cabling cavity containing the CPRI optical cablesand power cables of the fan and remove the cover of the cabling cavity.

Step 4 Disconnect the power cable of the fan subrack in the cabling cavity.

CAUTIONDo not touch the CPRI optical cable when disconnecting the power cable of the fan subrack.

Step 5 Loosen the two captive screws on the panel of the fan subrack.

Step 6 Remove the fan subrack from the anchor slots on the case.

Step 7 Slightly push the new fan subrack into the anchor slots and tighten the two captive screws onthe panel of the fan subrack.

Step 8 Install the power cable of the fan subrack.

Step 9 Fix the cover of the cabling cavity containing the CPRI optical cables and power cables of thefan and tighten the captive screws on the cover of the cabling cavity.



----End

Postrequisite

Check the following items after replacing the faulty fan subrack of the RRU3701C:

l The two bolts of the fan subrack are tightened.

l The fans are working properly.

l The door of the case is locked.

Contact the local Huawei office to handle the faulty fan subrack of the RRU3701C.




6-5

Prerequisite

l The required tools and materials are ready. The tools and materials are the ESD wrist strapor ESD gloves, and ESD box or bag.





1

(1) Optical module

l The optical modules are hot-swappable.

l You need to disconnect the optical fibers when replacing the faulty optical module.Therefore, services carried on the optical fibers are disrupted during the replacement.


Procedure






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12




6-7



NOTE



----End






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7 Replacing the Components of the Natural-Cooling RRU3701C

About This Chapter

Faulty RRU3701C components must be replaced promptly. The components that can be replacedfor the natural-cooling RRU3701C are the RRU3701C module, shell, and optical module.

7.1 Replacing the Natural-Cooling RRU3701CIf the RRU3701C is faulty, replace the RRU3701C.

7.2 Replacing the Shell of the RRU3701CIf the shell of the natural-cooling RRU3701C is faulty, replace the shell.


DBS3900 WiMAXSite Maintenance Guide

7 Replacing the Components of the Natural-CoolingRRU3701C


7-1

7.1 Replacing the Natural-Cooling RRU3701CIf the RRU3701C is faulty, replace the RRU3701C.

Prerequisitel The quantity and model of the faulty RRU3701Cs are confirmed and the new RRU3701Cs

are ready.l The installation position of each RRU3701C is recorded.l The position of each screw on the RRU3701Cs is recorded.l The ports to which all RRU3701C cables are connected are recorded.l The sectors of the RRU3701C are deactivated.l The required tools and materials are ready. The tools and materials are the ESD wrist strap

or ESD gloves, Phillips screwdriver, flat-head screwdriver, ESD box or bag, and dust-freecloth.

ContextAs a remote RF unit of the distributed base station, the RRU3701C works with other modulessuch as the BBU to constitute the DBS3900 base station system.

Replacing an RRU3701C disrupts all the services carried by the RRU3701C.

It takes about 30 minutes to replace a natural-cooling RRU3701C. In this time, the cables aredisconnected from the faulty RRU3701C and then connected to the new RRU3701C, and theservices are resumed.

CAUTIONl Take proper ESD prevention measures, for example, wear ESD wrist straps or gloves to

prevent boards, modules, and electronic components from being destroyed by staticdischarge from the human body.

l Use an optical fiber clip to remove the connector of the optical fiber on the RRU3701Cside.

NOTE

See the DBS3900 WiMAX Quick Installation Guide (RRU3701C) to install new RRU3701Cs.

The procedure described here is applicable to replacing RRUs of the same type as theRRU3701C. See DBS3900 WiMAX Reconfiguration Guide to replace RRUs of a different typefrom the RRU3701C.

Procedure


Step 2 Remove the shell by referring to 7.2 Replacing the Shell of the RRU3701C.




Issue 02 (2010-10-22)


Step 4 Remove the two screws from the installation holes on the lower attachment plate of theRRU3701C.

Step 5 Loosen the screws in the installation holes on the upper attachment plate of the RRU3701C, andremove the RRU3701C.

Step 6 Remove the four screws that fasten the attachment plates.

Step 7 Get the new RRU3701C.

Step 8 Use the four screws to fasten the attachment plates to the new RRU3701C.

Step 9 Align the installation holes of the upper attachment plate to the screws used to fasten theRRU3701C and tighten the screws.

Step 10 Fix the two screws into the installation holes on the lower attachment plate of the RRU3701Cto install the RRU3701C.



Step 13 Align the shell of the RRU3701C to the positioning holes on the attachment plates of theRRU3701C and fit the tabs on the shell into the anchor slots of the attachment plates.

Step 14 Tighten the two captive screws at the bottom of the shell of the RRU3701C to fix the shell.

Step 15 Lift the sliding blades on the right of the RRU3701C shell to secure the RF jumper. Hold thesliding blades and tighten the captive screws of the blades.

----End

Postrequisite

Check the following items after replacing the faulty RRU3701C:l All the cables on the new RRU3701C are correctly connected.l Each screw is fastened in the correct position on the new RRU3701C.l The new RRU3701C is functional after being powered on and all the services are normal.l Check the BIOS version and upgrade the version at the BBU3900 side.Contact the local Huawei office to handle the faulty RRU3701C.

7.2 Replacing the Shell of the RRU3701CIf the shell of the natural-cooling RRU3701C is faulty, replace the shell.

Prerequisite

l The new RRU3701C shell is ready.l A cross screwdriver is ready.




7-3

Context

It takes about 5 minutes to replace the RRU3701C shell. Replacing the RRU3701C shell doesnot affect the ongoing services.

Procedure

Step 1 Loosen the captive screws of the sliding blades on the right of the RRU3701C shell and pressdown the sliding blades.

Step 2 Loosen the two captive screws at the bottom of the RRU3701C shell.

Step 3 Pull the shell outward slightly to take the bottom of the shell away from the installation partsand then lift the shell higher to remove the tabs from the anchor slots on the attachment plate.

Step 4 Remove the faulty shell.

Step 5 Align the new shell of the RRU3701C to the positioning holes on the attachment plates of theRRU3701C and fit the tabs on the shell into the anchor slots of the attachment plates.

Step 6 Tighten the two captive screws at the bottom of the shell of the RRU3701C to fix the shell.

Step 7 Lift up the sliding blades on the right of the RRU3701C shell to secure the RF jumper. Hold thesliding blades and tighten the captive screws of the blades.

----End

Postrequisite

Check the following items after replacing the faulty RRU3701C shell:

l The two tabs at the top of the RRU3701C shell are fitted into the anchor slots on theattachment plate.

l The two captive screws at the bottom of the RRU3701C shell are tightened.

Contact the local Huawei office to handle the faulty RRU3701C shell.


Prerequisite

l The required tools and materials are ready. The tools and materials are the ESD wrist strapor ESD gloves, and ESD box or bag.






Issue 02 (2010-10-22)



1

(1) Optical module

l The optical modules are hot-swappable.

l You need to disconnect the optical fibers when replacing the faulty optical module.Therefore, services carried on the optical fibers are disrupted during the replacement.


Procedure









7-5





12




NOTE





Issue 02 (2010-10-22)


----End






7-7

8 Replacing the Components in the OMB

About This Chapter

This section describes how to replace the HEUA board, AC/DC power cable, DCDU, and theAC surge protection box in the OMB.

8.1 Replacing the HEUAThe Heat Exchange Unit Type A (HEUA) is a fan monitoring board. It distributes power to theFAN, monitors the running status of the FAN, collects the cabinet alarm information, and reportsit to the host.

8.2 Replacing the AC/DC Power EquipmentThe AC/DC power equipment is applicable to the AC cabinet and converts 220 V AC input to-48 V DC output.

8.3 Replacing the DCDUThe DCDU is the DC power distribution unit. Replacing the DCDU cuts off the power supplyto the site and therefore disrupts the services.

8.4 Replacing the AC Surge Protection BoxThe AC surge protection box protects the input power supply from surge.

DBS3900 WiMAXSite Maintenance Guide 8 Replacing the Components in the OMB


8-1

8.1 Replacing the HEUAThe Heat Exchange Unit Type A (HEUA) is a fan monitoring board. It distributes power to theFAN, monitors the running status of the FAN, collects the cabinet alarm information, and reportsit to the host.


or ESD gloves and the M3 screwdriver.l The quantity and models of HEUAs to be replaced are confirmed and new HEUAs are

ready.l Keep the keys ready for use after you gain site admission.

ContextFigure 8-1 shows the position of the HEUA in the OMB.

Figure 8-1 Position of HEUA

HEUA

Procedure


8 Replacing the Components in the OMBDBS3900 WiMAX



Issue 02 (2010-10-22)


Step 2 Record the connection positions of all the cables connected to the HEUA.

Step 3 Remove the power cables and monitoring cables connected to the HEUA, as shown in Figure8-2.


Step 4 Loosen the four M3 screws on the panel and then remove the HEUA, as shown in Figure 8-3.

Figure 8-3 Removing the HEUA



----End


filled with foam.





8-3

8.2 Replacing the AC/DC Power EquipmentThe AC/DC power equipment is applicable to the AC cabinet and converts 220 V AC input to-48 V DC output.


or ESD gloves, M3 screwdriver, and M6 screwdriver.

l The quantity and models of the modules to be replaced are confirmed and new modulesare ready.


Contextl The AC/DC power equipment consists of the PDU, PSU, PMU, and equipment subrack.

When a component of the AC/DC power equipment is confirmed to be faulty, replace thefaulty component. When the entire AC/DC power equipment is confirmed to be faulty,replace the entire AC/DC power equipment.

l Figure 8-4 shows the position of the AC/DC power equipment in the cabinet.

Figure 8-4 Position of the AC/DC power equipment in the cabinet

1

(1) AC/DC power equipment

l Figure 8-5 shows the positions of components of the AC/DC power equipment.




Issue 02 (2010-10-22)

Figure 8-5 Positions of the components

4

3

2

1

(1) PDU (2) PSU (3) PMU (4) Equipment subrack

l Replacing the AC/DC power equipment, PSU, PDU, or the equipment subrack disrupts all

the services carried by the BS. Therefore, the AC/DC power equipment, PSU, PDU, or theequipment subrack must be replaced within 20 minutes.

Procedure

Step 1 Power off the AC/DC power equipment.



Step 3 Record the connection positions of all the cables connected to the components to be replaced.

Step 4 Disconnect the cables.1. Disconnect the DC output cables from the PDU, as shown in Figure 8-6.

Figure 8-6 Disconnecting cables from the PDU



8-5

2. Disconnect the monitoring signal cables from the PMU, as shown in Figure 8-7.

Figure 8-7 Disconnecting cables from the PMU

3. Disconnect the AC input cables and DC output cables from the equipment subrack, as

shown in Figure 8-8.

Figure 8-8 Disconnecting cables from the equipment subrack

Step 5 Remove the components to be replaced.1. Loosen the M3 screw on the panel of the PDU and remove the PDU, as shown in Figure

8-9.




Issue 02 (2010-10-22)

Figure 8-9 Removing the PDU

1

2

2. Loosen the M3 screw on the panel of the PSU and remove the PSU, as shown in Figure

8-10.

Figure 8-10 Removing the PSU

1

2

3. Loosen the M3 screw on the panel of the PMU and remove the PMU, as shown in Figure

8-11.



8-7

Figure 8-11 Removing the PMU

1

2

4. Loosen the four M6 screws on the mounting ears of the equipment subrack and remove theequipment subrack, as shown in Figure 8-12.

Figure 8-12 Removing the equipment subrack

NOTE

l When the equipment subrack is confirmed to be faulty, remove the PDU, PSU, and PMU firstand then remove the equipment subrack from the cabinet.

l When the entire AC/DC power equipment is confirmed to be faulty, remove the entire AC/DCpower equipment from the cabinet for replacement.




Issue 02 (2010-10-22)

Step 6 If the PMU is to be replaced, set the DIP switches of the new PMU according to the positionsof the DIP switches of the faulty PMU.

Step 7 Install the new components.1. Install the AC/DC power equipment or the equipment subrack, fasten the bolts on the

mounting ears, and install the cables.2. Install the PDU, PSU, or PMU, fasten the screws on the panel [torque: 0.55 N.m (4.87

lbf.in.)], and then install the cables.

Step 8 Determine whether the new AC/DC power equipment functions properly according to theindicators on the AC/DC power equipment, BBU, and RRU.

NOTEFor the descriptions of the indicators on the AC/DC power equipment, BBU, and RRU, see relevanthardware descriptions.

Step 9 Power on the AC/DC power equipment.


----End



8.3 Replacing the DCDUThe DCDU is the DC power distribution unit. Replacing the DCDU cuts off the power supplyto the site and therefore disrupts the services.


or ESD gloves and the M6 screwdriver.l The quantity and models of the modules to be replaced are confirmed and new modules

are ready.l Keep the keys ready for use after you gain site admission.

Contextl Figure 8-13 shows the position of the DCDU in the OMB.



8-9

Figure 8-13 Position of the DCDU

DCDU

l Replacing the DCDU disrupts all the services carried by the BS. Therefore, the DCDU

must be replaced within 20 minutes.

Procedure

Step 1 Power off the DCDU.



Step 3 Record the connection positions of all the cables connected to the DCDU.

Step 4 Remove the power cables connected to the DCDU, as shown in Figure 8-14.




Issue 02 (2010-10-22)


Step 5 Loosen the four M6 screws on the panel and then remove the DCDU, as shown in Figure8-15.

Figure 8-15 Removing the DCDU

Step 6 Install the new board, fasten the screws on the board [torque: 2 N.m (17.70 lbf.in.)], and theninstall the cables.



8-11

Step 7 Power on the DCDU.


----End



8.4 Replacing the AC Surge Protection BoxThe AC surge protection box protects the input power supply from surge.


or ESD gloves and the M4 screwdriver.l The quantity and models of the surge protection boxes to be replaced are confirmed and

new surge protection boxes are ready.l Keep the keys ready for use after you gain site admission.

Contextl Figure 8-16 shows the position of the surge protection box in the OMB.

Figure 8-16 Position of the AC surge protection box

1

(1) AC surge protection box




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l Replacing the AC surge protection box disrupts the surge protection function of the BS.

Therefore, the AC surge protection box must be replaced within 10 minutes.

Procedure

Step 1 Power off the BS.



Step 3 Record the connection positions of all the cables connected to the AC surge protection box.

Step 4 Remove the monitoring cables and alarm cables from the AC surge protection box, as shown inFigure 8-17.


Step 5 Loosen the screws on the panel by using the M4 screwdriver and then remove the AC surgeprotection box, as shown in Figure 8-18.



8-13

Figure 8-18 Removing the AC surge protection box

Step 6 Install the new AC surge protection box, fasten the screws on the box [torque: 1.2 N.m (10.62lbf.in.)], and then install the cables.

Step 7 Power on the BS.


----End






Issue 02 (2010-10-22)

9 Replacing the Components of the SLPU

About This Chapter

During maintenance of the SLPU, the components to be replaced include the SLPU case andthe UELP board.

9.1 Replacing the SLPU CaseThe Signal Lightning Protection Unit (SLPU) provides surge protection for a BS.

9.2 Replacing the UELPThe Universal E1/T1 Lightning Protection Unit (UELP) provides lightning protection for fourE1/T1 links.

DBS3900 WiMAXSite Maintenance Guide 9 Replacing the Components of the SLPU


9-1

9.1 Replacing the SLPU CaseThe Signal Lightning Protection Unit (SLPU) provides surge protection for a BS.

Prerequisitel The model of the faulty SLPU case is confirmed and the new SLPU case is ready.l Ensure that the new SLPU case is intact and has the same version as the faulty one.l The required tools and materials are ready. The tools and materials are the ESD wrist strap

or gloves, Phillips screwdriver, ESD box or bag, and key to the cabinet door.

Context

CAUTIONDo not replace and install the SLPU case during a thunderstorm.

ProcedureStep 1 Inform the administrator of the M2000 that the SLPU case needs to be replaced. If necessary,

ask the administrator to back up or transfer the services carried by the boards in the SLPU case.



Step 3 Record the connection positions of all the cables connected to the boards.

Step 4 Remove the transmission cables connected to the boards in the SLPU case.

Step 5 Loosen the four M6 screws on the panel of the SLPU case and then remove the SLPU case, asshown in Figure 9-1.

Figure 9-1 Removing the SLPU

9 Replacing the Components of the SLPUDBS3900 WiMAX



Issue 02 (2010-10-22)

Step 6 Remove all the boards in the faulty SLPU case, install the boards to the new SLPU case, andthen install filler panels to the idle slots.

Step 7 Install the new case, fasten the screws on the case [torque: 2 N.m (5.31 lbf.in.)], and then installthe cables.

Step 8 Inform the administrator of the M2000 that the hardware replacement is complete and ask theadministrator to confirm that no related alarms are generated.


----End

PostrequisiteAfter replacing the SLPU case, perform the following steps:

l Put the replaced components into the ESD bag and then put the bag into the cardboard boxfilled with foam.



9.2 Replacing the UELPThe Universal E1/T1 Lightning Protection Unit (UELP) provides lightning protection for fourE1/T1 links.



l The quantity and models of the boards to be replaced are confirmed.


Contextl Figure 9-2 shows the position of the UELP in the BBU.

Figure 9-2 Position of the UELP




9-3

CAUTIONDo not replace and install the UELP during a thunderstorm.

Procedure




Step 3 Disconnect the transmission cable connected to the UELP, as shown in Figure 9-3.

Figure 9-3 Removing the cable

Step 4 Loosen the two M3 screws on the panel and then remove the UELP, as shown in Figure 9-4.

Figure 9-4 Removing the UELP

1

21

Step 5 Ensure that the settings of the DIP switches on the new board are consistent with the settings ofthe removed board. If necessary, refer to UELP for the information of the DIP switches.


9 Replacing the Components of the SLPUDBS3900 WiMAX



Issue 02 (2010-10-22)

Step 7 Inform the administrator of the M2000 that the replacement is complete and ask the administratorto load and activate the software version of the UELP.


----End





9-5

10 Replacing the Surge Protector for theAntenna System

When the surge protector for the antenna system at the BBU side is faulty, you need to replaceit.

Prerequisite

l A new surge protector is ready.l The required tools are ready. The tools are Phillips screwdriver, ESD wrist strap or gloves,

and ESD box or bag.

Context

Replacing the surge protector takes about five minutes, which does not affect the system.

Procedure

Step 1 Remove the faulty surge protector.1. Remove the GPS clock signal cables and feeders connected to the faulty surge protector.2. Remove the PGND cables connected to the faulty surge protector.3. Put the faulty surge protector into the ESD bag.

Step 2 Install a new surge protector.1. Connect the PGND cables to the surge protector.2. Connect the GPS clock signal cables and feeders to the surge protector.3. Take waterproofing measures if the outdoor surge protector is provided.

CAUTIONDo not replace and install the surge protector in a thunderstorm.

----End

DBS3900 WiMAXSite Maintenance Guide 10 Replacing the Surge Protector for the Antenna System


10-1

Result VerificationAfter replacing the faulty GPS surge protector, check that:l The surge protector is correctly grounded.l The cable connectors on the two ends of the surge protector are tightened.Contact the local Huawei office to handle the faulty surge protector.

10 Replacing the Surge Protector for the Antenna SystemDBS3900 WiMAX



Issue 02 (2010-10-22)

11 Replacing the Cables of the DBS3900

About This Chapter

When the DBS3900 cables are faulty, you need to replace them promptly. The cables can bereplaced are: transmission cables, signal cables, and RF jumpers.

ContextNOTE

Contact Huawei engineers in the following situations:l You decide to arrange for devices, cables, and connectors by yourself.l You need to cut the cable in specified length.

11.1 Replacing the BBU Power CablesThe BBU power cable provides -48 V DC power input to the BBU.

11.2 Replacing the Dry Contact Alarm CablesThe dry contact alarm cable transmits external Boolean value alarm signals to the BBU.

11.3 Replacing the GPS Clock Signal CablesThe GPS clock signal cable is connected to the GPS antenna system to receive GPS signals. Thereceived GPS signals can be used as the clock reference for the BBU.

11.4 Replacing the Monitoring Signal CablesThe monitoring signal cables are used to transmit the alarm signals from external monitoringequipment. The replaceable monitoring signal cables are the CMUA-BBU monitoring signalcable and the EMUA monitoring signal cable.

11.5 Replacing E1/T1 Signal Cables of the BBU3900The E1/T1 signal cables are used to connect the BBU and external transmission equipment andto transmit baseband signals.

11.6 Replacing the E1/T1 Surge Protection Transfer CableThe E1/T1 surge protection transfer cable connects the UTRP and the UELP, and protects theE1/T1 signals from surge.

11.7 Replacing FE/GE Ethernet Cables of the BBU3900The FE/GE Ethernet cables are used to connect the BBU3900 and ASN-GW through the router.

11.8 Replacing FE/GE Optical Fibers of the BBU3900

DBS3900 WiMAXSite Maintenance Guide 11 Replacing the Cables of the DBS3900


11-1

The FE/GE optical fibers are used to transmit the optical signals between the BBU and the ASN-GW.

11.9 Replacing CPRI Optical FibersThe Common Public Radio Interface (CPRI) optical fibers are used to connect the BBU3900and the RRU and to transmit digital signals.

11.10 Replacing the RRU Power CablesThe RRU power cable feeds external -48 V DC power to the RRU.

11.11 Replacing the AISG Multicore Cable of the RRU3702/RRU3703The AISG multicore cable connects the RRU and the remote control unit (RCU) and transmitscontrol signals from the BS to the RET antenna.

11.12 Replacing the AISG Extension Cable of the RRU3702/RRU3703When the distance between the RRU and the RCU is longer than 5 m, you need to connect anAISG extension cable to the AISG multicore cable to extend the length.

11.13 Replacing the RF Jumpers of the RRU3702/RRU3703The RF jumpers of the RRU are used to input and output RF signals. The procedures of replacingthe RF jumpers of the RRU3702 and the RRU3703 are the same.

11.14 Replacing the RF Jumper of the RRU3701CThe RF jumper of the RRU is used to input and output RF signals.

11 Replacing the Cables of the DBS3900DBS3900 WiMAX



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11.1 Replacing the BBU Power CablesThe BBU power cable provides -48 V DC power input to the BBU.

Prerequisite

l The required tools and materials are ready. The tools and materials are the ESD wrist strapor ESD gloves, M3 Phillips screwdriver, cable cutter, and power cable crimping tool.

l The quantity and models of the cables to be replaced are confirmed.


Context

Replacing the BBU power cable disrupts the services provided by the BBU.

Procedure

Step 1 Prepare the new power cable of the same length as the faulty power cable to be replaced.




Step 4 Use a Phillips screwdriver to loosen the screws of the faulty 3V3 connector, and then removethe connector from the BBU panel.

Step 5 Connect the 3V3 connector on one end of the new power cable to the power port on the BBUpanel, and then use a Phillips screwdriver to tighten the screws.

Step 6 Route the new power cable to the external power supply along the path of the faulty cable.

Step 7 Strip the sheath and shielding layer at the ends of the new power cable and make OT terminals.

Step 8 Take away the faulty power cable. Install the power cable.

Step 9 Power on the BBU by referring to Powering On the BBU.

Step 10 Determine whether the boards function properly according to the status of the indicators. Fordescription of the indicators, see DBS3900 WiMAX Hardware Description.


----End



11-3

Postrequisitel Put the replaced cables in an ESD bag.

l Fill the fault card to record the information of the replaced cables.

l Contact the local Huawei office to handle the faulty cables.

11.2 Replacing the Dry Contact Alarm CablesThe dry contact alarm cable transmits external Boolean value alarm signals to the BBU.

Prerequisite

l The required tools and materials are ready. The tools and materials are the ESD wrist strapor ESD gloves, M3 Phillips screwdriver, cable cutter, and crimping tool.



Context

Replacing the dry contact alarm cable disrupts the monitoring of external equipment but doesnot affect services.

Procedure



Step 2 Mark the position of the cable to be replaced. Attach a replacement label close to the installationposition to avoid incorrect operations.

Step 3 Prepare a terminal for one end of the new dry contact alarm cable and connect the terminal tothe external alarm equipment.

Step 4 Disconnect one end of the faulty dry contact alarm cable from the BBU and the other end fromthe external alarm equipment.

Step 5 Route the new dry contact alarm cable along the path of the faulty dry contact alarm cable.

Step 6 Check whether the new dry contact alarm cable functions properly.


----End




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Postrequisitel Put the replaced cables in an ESD bag.l Fill the fault card to record the information of the replaced cables.l Contact the local Huawei office to handle the faulty cables.

11.3 Replacing the GPS Clock Signal CablesThe GPS clock signal cable is connected to the GPS antenna system to receive GPS signals. Thereceived GPS signals can be used as the clock reference for the BBU.


or ESD gloves.l The quantity and models of the cables to be replaced are confirmed.l Keep the keys ready for use after you obtain site admission.

ContextReplacing the GPS clock signal cable disrupts the clock signals.

Procedure



Step 2 Mark the installation position of the cable to be replaced. Attach a replacement label close tothe installation position to avoid incorrect operations.

Step 3 Disconnect the faulty clock signal cable.

Step 4 Route the new clock signal cable along the path of the faulty clock signal cable.

Step 5 Ensure that the new clock signal cable functions properly.


----End




11-5

11.4 Replacing the Monitoring Signal CablesThe monitoring signal cables are used to transmit the alarm signals from external monitoringequipment. The replaceable monitoring signal cables are the CMUA-BBU monitoring signalcable and the EMUA monitoring signal cable.

11.4.1 Replacing the CMUA-BBU Monitoring Signal CableThe CMUA-BBU monitoring signal cable connects the CMUA in the APM cabinet and theBBU, and reports the monitoring signals collected by the CMUA to the BBU.

11.4.2 Replacing the EMUA Monitoring Signal CableThe EMUA monitoring signal cable connects the BBU3900 and the EMUA or the EMU, andreports the alarms from environment monitoring equipment.

11.4.1 Replacing the CMUA-BBU Monitoring Signal CableThe CMUA-BBU monitoring signal cable connects the CMUA in the APM cabinet and theBBU, and reports the monitoring signals collected by the CMUA to the BBU.

Prerequisite

l The required tools and materials are ready. The tools and materials are the ESD wrist strapor ESD gloves.



Procedure




Step 3 Disconnect the faulty CMUA-BBU monitoring signal cable.

Step 4 Route the new CMUA-BBU monitoring signal cable along the path of the faulty CMUA-BBUmonitoring signal cable.

Step 5 Ensure that the new CMUA-BBU monitoring signal cable functions properly.


----End




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11.4.2 Replacing the EMUA Monitoring Signal CableThe EMUA monitoring signal cable connects the BBU3900 and the EMUA or the EMU, andreports the alarms from environment monitoring equipment.

Prerequisite

l The required tools and materials are ready. The tools and materials are the ESD wrist strapor ESD gloves.



Procedure




Step 3 Disconnect the faulty EMUA monitoring signal cable.

Step 4 Route the new EMUA monitoring signal cable along the path of the faulty EMUA monitoringsignal cable.

Step 5 Ensure that the new EMUA monitoring signal cable functions properly.


----End






11-7

11.5 Replacing E1/T1 Signal Cables of the BBU3900The E1/T1 signal cables are used to connect the BBU and external transmission equipment andto transmit baseband signals.

Prerequisite

l The required tools and materials are ready. The tools and materials are the ESD wrist strapor ESD gloves, M3 Phillips screwdriver, cable cutter, crimping pliers, and ESD box or bag.



Context

Replacing the E1/T1 signal cables disrupts the services provided by the BBU.

Procedure



Step 2 Route the new E1/T1 signal cables to the device at the peer end along the path of the faultycables.

Step 3 Remove the DB26 male connectors of the faulty E1/T1 signal cables from E1/T1 ports and theother ends of the E1/T1 signal cables from the peer equipment.

Step 4 Put the faulty E1/T1 signal cables in an ESD bag.

Step 5 Connect the DB26 male connectors of the new E1/T1 signal cables to E1/T1 ports and the otherends of the E1/T1 signal cables to the peer equipment.

Step 6 Arrange and bind the new E1/T1 signal cables.

----End







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11.6 Replacing the E1/T1 Surge Protection Transfer CableThe E1/T1 surge protection transfer cable connects the UTRP and the UELP, and protects theE1/T1 signals from surge.


or ESD gloves.l The quantity and models of the cables to be replaced are confirmed.l Keep the keys ready for use after you obtain site admission.

Context

CAUTIONDo not replace and install the surge protection transfer cable during a thunderstorm.

Procedure




Step 3 Disconnect the E1/T1 surge protection transfer cable.

Step 4 Route the new E1/T1 surge protection transfer cable along the path of the faulty E1/T1 surgeprotection transfer cable.

Step 5 Ensure that the new E1/T1 surge protection transfer cable functions properly.


----End




11-9

11.7 Replacing FE/GE Ethernet Cables of the BBU3900The FE/GE Ethernet cables are used to connect the BBU3900 and ASN-GW through the router.


or ESD gloves, M3 Phillips screwdriver, cable cutter, crimping pliers, and ESD box or bag.l The quantity and models of the cables to be replaced are confirmed.l Keep the keys ready for use after you gain site admission.

ContextReplacing the Ethernet cable disrupts the services provided by the BBU.

Procedure



Step 2 Route the new Ethernet cable to the peer device along the path of the faulty cable.

Step 3 Remove the RJ45 connector of the faulty Ethernet cable from the GE port of the BBU anddisconnect the other end of the Ethernet cable from the peer device or switch.

Step 4 Put the faulty Ethernet cable in an ESD bag.

Step 5 Connect the RJ45 connector of the new Ethernet cable to the GE port of the BBU and connectthe other end of the Ethernet cable to the peer equipment or switch.

Step 6 Arrange and bind the new Ethernet cables.

----End


11.8 Replacing FE/GE Optical Fibers of the BBU3900The FE/GE optical fibers are used to transmit the optical signals between the BBU and the ASN-GW.




Issue 02 (2010-10-22)

Prerequisite


l The quantity and models of the fibers to be replaced are confirmed.l Keep the keys ready for use after you gain site admission.

Context

Replacing the FE/GE optical fiber disrupts the services provided by the BBU.

Procedure



Step 2 Route the new FE/GE optical fiber to the peer device along the path of the faulty fiber.

Step 3 Press the latch on the LC connector of the faulty optical fiber, and then remove the LC connectorfrom the optical module. Remove the other connector from the peer device.

Step 4 Put the faulty FE/GE optical fiber in an ESD box.

Step 5 Plug the LC connector of the new optical fiber into the same optical module according to thelabel on the optical fiber. Install the other connector on the peer device.

Step 6 Arrange and bind the new optical fibers.

----End

Postrequisitel Put the replaced fibers in an ESD bag.l Fill the fault card to record the information of the replaced fibers.l Contact the local Huawei office to handle the faulty fibers.

11.9 Replacing CPRI Optical FibersThe Common Public Radio Interface (CPRI) optical fibers are used to connect the BBU3900and the RRU and to transmit digital signals.

Prerequisite




11-11

l The quantity and models of the fibers to be replaced are confirmed.l Keep the keys ready for use after you gain site admission.

ContextReplacing the CPRI optical fiber disrupts the services carried by the optical fiber.

Procedure



Step 2 Route the new CPRI optical fiber to the peer device along the path of the faulty fiber.

NOTE

When routing the optical fiber, place the end of the fiber with longer exposed part on the BBU side, protectthe exposed part with a winding tube, and place the other end on the RRU side.

Step 3 Press the latches on the connectors of the faulty optical fiber connected to the BBU and RRU,and then pull the connectors out of the optical modules.

Step 4 Put the faulty optical fiber into an ESD box.

Step 5 Insert the connectors of the new optical fiber into the optical modules according to the labels onthe optical fiber.

Step 6 Arrange and bind the new optical fibers.

----End

Postrequisitel Put the replaced fibers in an ESD bag.l Fill the fault card to record the information of the replaced fibers.l Contact the local Huawei office to handle the faulty fibers.

11.10 Replacing the RRU Power CablesThe RRU power cable feeds external -48 V DC power to the RRU.


or ESD gloves, M3 Phillips screwdriver, cable cutter, crimping pliers, and ESD box or bag.l The quantity and models of the cables to be replaced are confirmed.l Keep the keys ready for use after you obtain site admission.




Issue 02 (2010-10-22)

ContextThe wires at the two ends of the RRU3701C/RRU3702 power cable are exposed. Prepare OTterminals on site for one end of the power cable and connect the terminals to the power port inthe RRU cabling cavity. The other end is connected to the power supply system at the installationsite according to the onsite condition. At one end of the RRU3703 power cable are two femaleFA (field assembled) connectors and the other end of the power cable are exposed wires whichare connected to the power supply system at the installation site according to the onsite condition.

NOTEPrepare cable connectors by referring to the Quick Installation Guide

Replacing the RRU power cable disrupts the services provided by the RRU.

Procedure

Step 1 Prepare the new power cable of the same length as the faulty power cable to be replaced, andmake corresponding cable connectors.



Step 3 Power off the RRU by referring to 3.4 Powering Off the RRU.

Step 4 Disconnect the faulty power cable.

If... Then...

RRU3701C/RRU3702 power cable Use the Phillips screwdriver to loosen the screw on theconnector of the faulty power cable and remove thecable from the power port on the RRU panel.Disconnect the other end of the power cable from theonsite power supply system.

RRU3703 power cable Remove the female FA connectors from the power porton the RRU panel and disconnect the other end of thepower cable from the onsite power supply system.

Step 5 Route the new power cable to the external power supply along the path of the faulty cable andthen install the new power cable.



11-13

If... Then...

RRU3701C/RRU3702 power cable Connect the OT terminal to the power port in the RRUcabling cavity, and press the shielding layer of thepower cable under the spring plate at the cable outlet toensure the grounding of the cable. Connect the otherend to the power supply system according to the onsitecondition.

RRU3703 power cable Connect the female FA connector of the blue wire tothe NEG (-) 0 port in the RRU cabling cavity and thefemale FA connector of the black wire to the RTN (+)0 port in the RRU cabling cavity. The other end of thepower cable is connected to power supply system at theinstallation site according to the onsite condition.

Step 6 Power on the RRU by referring to 3.3 Powering On the RRU.

Step 7 Determine whether the equipment functions properly according to the status of the indicators.For description of the indicators, see DBS3900 WiMAX Hardware Description.


----End




11.11 Replacing the AISG Multicore Cable of the RRU3702/RRU3703

The AISG multicore cable connects the RRU and the remote control unit (RCU) and transmitscontrol signals from the BS to the RET antenna.

Prerequisite

l The required tools and materials are ready. The tools and materials are the ESD wrist strapor ESD gloves, M3 Phillips screwdriver, cable cutter, and power cable crimping tool.



Procedure





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Step 2 Disconnect the AISG multicore cable of the RRU3702/RRU3703.

Step 3 Install the new AISG multicore cable of the RRU3702/RRU3703.



----End


11.12 Replacing the AISG Extension Cable of the RRU3702/RRU3703

When the distance between the RRU and the RCU is longer than 5 m, you need to connect anAISG extension cable to the AISG multicore cable to extend the length.


or ESD gloves, M3 Phillips screwdriver, cable cutter, and power cable crimping tool.l The quantity and models of the cables to be replaced are confirmed.l Keep the keys ready for use after you obtain site admission.

Procedure



Step 2 Disconnect the AISG extension cable of the RRU3702/RRU3703.

Step 3 Install the new AISG extension cable of the RRU3702/RRU3703.



11-15



----End


11.13 Replacing the RF Jumpers of the RRU3702/RRU3703The RF jumpers of the RRU are used to input and output RF signals. The procedures of replacingthe RF jumpers of the RRU3702 and the RRU3703 are the same.


or ESD gloves, screwdriver, cable cutter, crimping pliers, waterproof tape, insulation tape,feeder cable cutting tool, and ESD box or bag.

l The quantity and models of the jumpers to be replaced are confirmed.l Keep the keys ready for use after you gain site admission.

ContextPowering off the RRU before replacing the RRU RF jumper disrupts all the services carried bythe sector carriers associated with the RRU.

NOTE

See the DBS3900 WiMAX Quick Installation Guide (RRU3702&RRU3703) to install new RRU RFjumpers.

Procedure



Step 2 Turn off the switch of the external power supply to the RRU.

Step 3 Remove the waterproof insulation tapes on RF ports of the RRU and of the antenna system.

Step 4 Remove the faulty RF jumpers from the RF port of the RRU.




Issue 02 (2010-10-22)

Step 5 Remove the faulty RF jumpers from the RF ports of the antenna system.

Step 6 Connect the connector of the new RF jumper to the RF port on the RRU.

Step 7 Wrap the joints at the RRU RF ports with a layer of insulation tape. Wind the tape around thejoint from top down.

Step 8 Wrap the insulation tape with three layers of waterproof tape.

NOTE

The tape is wrapped in the following sequence: from top down, from bottom up, and then from top down.For every two adjacent tape layers, the tape on the upper layer overlaps about half the width of the tape onthe lower layer.

Step 9 Wrap the waterproof tape with three layers of insulation tape. For details about how to wrap theinsulation tape, see Step 8.

Step 10 Mount the matched load on the idle RF port. Use the waterproof insulation tape and PVC tapeto wrap the joint between the matched load and the RF port in the same way as described in theprevious steps.

Step 11 Connect the RF jumpers to the antenna system.

Step 12 Wrap the joint at the RF ports of the antenna system with the waterproof insulation tape.

Step 13 Stick the color rings. The new color rings should have the same color as the color rings on theold RF jumpers.

Step 14 Turn on the switch of the external power supply to the RRU.

----End

Postrequisitel Put the replaced jumpers in an ESD bag.l Fill the fault card to record the information of the replaced jumpers.l Contact the local Huawei office to handle the faulty jumpers.

11.14 Replacing the RF Jumper of the RRU3701CThe RF jumper of the RRU is used to input and output RF signals.

Prerequisite

l The required tools and materials are ready. The tools and materials are the ESD wrist strapor ESD gloves, screwdriver, cable cutter, crimping pliers, waterproof tape, insulation tape,feeder cable cutting tool, and ESD box or bag.

l The quantity and models of the cables to be replaced are confirmed.l Keep the keys ready for use after you obtain site admission.

Context

Replacing the RF jumper of the RRU3701C disrupts all the services carried by the sectors relatedto the RRU3701C.



11-17

NOTE

See the DBS3900 WiMAX Quick Installation Guide (RRU3701C) to install new RRU3701C RF jumpers.

Procedure



Step 2 Turn off the switch of the external power supply to the RRU3701C.

Step 3 Open the door of the RRU3701C case or dismantle the RRU3701C shell.

Step 4 Remove the waterproof tape at the RF ports of the RRU3701C and the antenna system.

Step 5 Remove the faulty RF jumper from the RF port of the RRU3701C.

Step 6 Remove the faulty RF jumper from the RF port of the antenna system.

Step 7 Connect the connector of the new RF jumper to the RF port of the RRU3701C.

Step 8 Wrap the joint of the RF port of the RRU3701C with the waterproof insulation tape.

NOTE

Wrap the joint spirally upward, downward, and then upward again. That is, the joint is wrapped by threelayers of waterproof insulation tape. For every two adjacent tape layers, the tape on the upper layer overlapsabout half the width of the tape on the lower layer.

Step 9 Wrap up the waterproof insulation tape with the PVC tape in the same way.

Step 10 Mount the 50-ohm matched load on the idle RF port. Use the waterproof insulation tape andPVC tape to wrap the joint between the matched load and the RF port in the same way asdescribed in the previous steps.

Step 11 Connect the RF jumper to the antenna system.

Step 12 Wrap the joint at the RF ports of the antenna system with the waterproof insulation tape.

Step 13 Stick the color rings. The new color rings should have the same color as the color rings on theold RF jumpers.

Step 14 Turn on the switch of the external power supply to the RRU3701C.

Step 15 Lock the door of the RRU3701C case or reinstall the RRU3701C shell after ensuring that theRRU3701C is operational.

----End

Postrequisitel Put the replaced cables in an ESD bag.l Fill the fault card to record the information of the replaced cables.




Issue 02 (2010-10-22)




11-19

Documents

DBS3900 WiMAX Site Maintenance Guide(V300R003C00_02)