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Copyright Huawei Technologies Co., Ltd. 2011. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written

consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

The purchased products, services and features are stipulated by the contract made between Huawei and the

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

purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees or representations

of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute the warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

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About This Document

Purpose

This document describes how to perform the hardware maintenance tasks after the BSC6900

commissioning, to maintain the hardware operation of the BSC6900. The maintenance tasks

involve powering on/off the BSC6900 cabinet, replacing components, and routine maintenancetasks such as checking LEDs and monitoring the site environment.

Version

The following table lists the product version related to the document.

Product Name Version

BSC6900 V900R012C01

Intended Audience

This document is intended for:

l Network planning engineers

l System engineers

l Field engineers

Organization

1 Changes in the BSC6900 GSM Site Maintenance Guide

This chapter describes the changes in the BSC6900 GSM Site Maintenance Guide.

2 Site Maintenance Preparations

This chapter describes the preparations for the BSC6900 site maintenance, including the tool

and spare part preparations.

3 Routine Hardware Maintenance Items

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This chapter describes the routine hardware maintenance items of the BSC6900. Different items

require different maintenance methods.

4 Powering On/Off the BSC6900

This chapter describes how to power on and power off the BSC6900. The following is described:the distribution of the power switches, powering on the BSC6900 cabinet, powering off the

BSC6900 cabinet in a normal situation, and powering off the BSC6900 cabinet in case of

emergencies.

5 Cleaning the Fan Box

This chapter describes how to clean a fan box. To ensure stability and reliability of the equipment,

the maintenance personnel should clean each fan box (including the fan boxes in the service

subracks and the fan boxes in the independent fan subrack) regularly, preferably once every

year.

6 Cleaning and Replacing the Air Filters

This chapter describes how to clean and replace an air filter. The air filter protects the boards

and the BSC6900 from dust. If an air filter is damaged, you must replace it with a new one in

time.

7 Replacing Boards and Modules

This chapter describes how to replace boards and modules in the BSC6900 cabinet, which

involves replacing the boards and modules, acknowledging a successful replacement, and

handling of the faulty boards. Each section provides an estimated time for the replacement of

the board as a reference.

8 Replacing the Cables

This chapter describes how to replace the Ethernet cable, E1/T1 cable, optical cable, clock signal

cable, cable to the alarm box, and power distribution box monitoring cable. This chapter also

describes how to check that the cables are successfully replaced and how to handle the faulty

cables.

9 LEDs on the Boards

This chapter describes the LEDs on the BSC6900 boards.

10 DIP Switches on Components

This chapter describes the DIP switches on the boards and subracks of the BSC6900.

11 BSC6900 Site Maintenance Record

This chapter describes the BSC6900 site maintenance record.

Conventions

Symbol Conventions

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

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Symbol Description

Indicates a hazard with a high level of risk, which if not

avoided, will result in death or serious injury.

Indicates a hazard with a medium or low level of risk, which

if not avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation, which if not

avoided, could result in equipment damage, data loss,

performance degradation, or unexpected results.

Indicates a tip that may help you solve a problem or save

time.

Provides additional information to emphasize or supplement

important 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.

Italic Book titles are in italics.

Courier New Examples of information displayed on the screen are in

Courier 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 by

vertical bars. One item is selected.

[ x | y | ... ] Optional items are grouped in brackets and separated by

vertical bars. One item is selected or no item is selected.

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{ x | y | ... }* Optional items are grouped in braces and separated by

vertical bars. A minimum of one item or a maximum of all

items can be selected.

[ x | y | ... ]* Optional items are grouped in brackets and separated by

vertical 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 titles

are in boldface. For example, click OK.

> Multi-level menus are in boldfaceand 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.

Format Description

Key Press the key. For example, press Enterand press Tab.

Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt

+Ameans the three keys should be pressed concurrently.

Key 1, Key 2 Press the keys in turn. For example, pressing Alt, Ameans

the 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 moving

the pointer.

Double-click Press the primary mouse button twice continuously and

quickly without moving the pointer.

Drag Press and hold the primary mouse button and move the

pointer to a certain position.

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Contents

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

1 Changes in the BSC6900 GSM Site Maintenance Guide...................................................1-1

2 Site Maintenance Preparations................................................................................................2-1

2.1 Site Maintenance Tool Preparations...............................................................................................................2-2

2.2 Spare PartPreparations...................................................................................................................................2-2

3 Routine Hardware Maintenance Items..................................................................................3-1

3.1 Equipment Room Maintenance Items.............................................................................................................3-2

3.2 Maintaining the Power Supply and Grounding Systems................................................................................3-2

3.3 Cabinet Maintenance Items.............................................................................................................................3-4

3.4 Cable Maintenance Items................................................................................................................................3-5

4 Powering On/Off the BSC6900................................................................................................4-1

4.1 Distribution of Power Switches on the Common Power Distribution Box.....................................................4-24.2 Distribution of Power Switches on the High-Power PDB..............................................................................4-4

4.3 Powering On the Cabinet................................................................................................................................4-5

4.4 Powering Off the Cabinet in a Normal Situation............................................................................................4-8

4.5 Powering Off the Cabinet in Emergency Cases..............................................................................................4-9

5 Cleaning the Fan Box.................................................................................................................5-1

6 Cleaning and Replacing the Air Filters.................................................................................6-1

6.1 Position of the Air Filters................................................................................................................................6-2

6.2 Cleaning the Air Filter at the Bottom of the N68E-22 Cabinet......................................................................6-3

6.3 Cleaning the Air Filter on the Inner Side of the Cabinet Door.......................................................................6-5

6.4 Replacingthe Air Filters.................................................................................................................................6-6

7 Replacing Boards and Modules...............................................................................................7-1

7.1 Strategy on Replacing Legacy Components in an Upgrade Scenario.............................................................7-4

7.2 Procedure for Replacing a Board....................................................................................................................7-4

7.2.1 Removing a Board..................................................................................................................................7-5

7.2.2 Inserting a Board....................................................................................................................................7-8

7.3 Replacing a DPUa/DPUc/DPUd/DPUf Board..............................................................................................7-10

7.4 Replacing an EIUa Board..............................................................................................................................7-13

7.5 Replacing an FG2a Board.............................................................................................................................7-16

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7.6 Replacing an FG2c Board.............................................................................................................................7-19

7.7 Replacing a GCUa/GCGa Board...................................................................................................................7-23

7.8 Replacing a GOUa Board..............................................................................................................................7-25

7.9 Replacing a GOUc Board..............................................................................................................................7-29

7.10 Replacing an MDMC Board.......................................................................................................................7-32

7.11 Replacing an OIUa Board...........................................................................................................................7-34

7.12 Replacing an OMU Board...........................................................................................................................7-37

7.12.1 Checking the OMU Information .......................................................................................................7-40

7.12.2 Backing Up System Files...................................................................................................................7-42

7.12.3 Replacing the OMU Board.................................................................................................................7-43

7.12.4 Installing the Operating System and Loading the OMU Applications..............................................7-47

7.12.5 Verifying OMU Board Replacement ................................................................................................7-49

7.13 Replacing an SCUa Board...........................................................................................................................7-50

7.14 Replacing a TNUa Board............................................................................................................................7-537.15 Replacing an XPUa Board..........................................................................................................................7-56

7.16 Replacing an XPUb Board..........................................................................................................................7-59

7.17 Replacing a WOPB Board...........................................................................................................................7-62

7.18 Replacing a Subrack....................................................................................................................................7-64

7.19 Replacing the Independent Fan Subrack.....................................................................................................7-66

7.20 Replacing the Power Distribution Box........................................................................................................7-67

7.21 Replacing the Fan Box................................................................................................................................7-73

7.22 Replacing the Pluggable Optical Module....................................................................................................7-78

7.23 Replacing an Optical Splitter/Combiner.....................................................................................................7-80

7.24 Replacing the KVM....................................................................................................................................7-82

7.25 Replacing the LAN Switch.........................................................................................................................7-84

7.26 Replacing the GBAM..................................................................................................................................7-85

8 Replacing theCables.................................................................................................................8-1

8.1 Replacinga Power Cable................................................................................................................................8-3

8.2 Replacing an E1/T1 Cable...............................................................................................................................8-5

8.3 Replacing an Optical Cable.............................................................................................................................8-7

8.4 Replacing an Ethernet Cable...........................................................................................................................8-9

8.5 Replacing a Clock Signal Cable....................................................................................................................8-11

8.6 Replacing a Y-Shaped Clock Cable..............................................................................................................8-13

8.7 Replacing an Inter-TNUa Cable....................................................................................................................8-14

8.8 Replacing an EMU RS485 Communication Cable.......................................................................................8-16

8.9 Replacing a Signal Cable to the Alarm Box.................................................................................................8-17

8.10 Replacing the Monitoring Signal Cable for the Power Distribution Box...................................................8-18

8.11 Replacing the Monitoring Signal Cable for the Independent Fan Subrack.................................................8-20

9 LEDs on the Boards....................................................................................................................9-1

9.1 LEDs on the DPUa Board...............................................................................................................................9-3

9.2 LEDs on the DPUc Board...............................................................................................................................9-3

9.3 LEDs on the DPUd Board...............................................................................................................................9-4

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9.4 LEDs on the EIUa Board................................................................................................................................ 9-4

9.5 LEDs on the FG2a Board................................................................................................................................9-5

9.6 LEDs on the FG2c Board................................................................................................................................9-6

9.7 LEDs on the GCUa Board...............................................................................................................................9-7

9.8 LEDs on the GOUa Board.............................................................................................................................. 9-7

9.9 LEDs on the GOUc Board.............................................................................................................................. 9-8

9.10 LEDs on the MDMC Board..........................................................................................................................9-9

9.11 LEDs on the OIUa Board..............................................................................................................................9-9

9.12 LEDs on the OMUa/OMUb Board.............................................................................................................9-10

9.13 LEDs on the PAMU Board.........................................................................................................................9-11

9.14 LEDs on the PEUa Board............................................................................................................................9-11

9.15 LEDs on the POUc Board...........................................................................................................................9-12

9.16 LEDs on the SCUa Board...........................................................................................................................9-13

9.17 LEDs on the TNUa Board...........................................................................................................................9-13

9.18 LEDs on the XPUa Board...........................................................................................................................9-14

9.19 LEDs on the XPUb Board...........................................................................................................................9-15

10 DIP Switches on Components.............................................................................................10-1

10.1 DIP Switch on the Subrack.........................................................................................................................10-2

10.2 DIP Switches on the EIUa Board................................................................................................................10-4

10.3 DIP Switch on the MDMC Board...............................................................................................................10-6

10.4 DIP Switch on the PAMU Board................................................................................................................10-7

10.5 DIP Switches on the PEUa Board...............................................................................................................10-7

10.6 DIP Switch on the PFCU Board................................................................................................................10-10

10.7 Pins on the PFCB Board............................................................................................................................10-12

11 BSC6900 SiteMaintenance Record.....................................................................................11-1

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Figures

Figure 4-1Mapping between the power switches and the components in the MPR (configured with OMU board)/

EPR/TCR...............................................................................................................................................................4-2

Figure 4-2Mapping between the power switches and the components in the MPR (configured with GBAM)

...............................................................................................................................................................................4-3

Figure 4-3Distribution of power switches on the power distribution box of the MPR/EPR/TCR..................... 4-4Figure 6-1Air filters in the single-door N68E-22 cabinet...................................................................................6-2

Figure 6-2Air filters in the double-door N68E-22 cabinet..................................................................................6-3

Figure 6-3Removing the air filter from the bottom of the cabinet......................................................................6-4

Figure 6-4Installing the air filter at the bottom of the cabinet............................................................................ 6-5

Figure 7-1Removing a board(configuring the new ejector levers)..................................................................... 7-6

Figure 7-2Removing a board(configuring the old ejector levers).......................................................................7-7

Figure 7-3Installing a BSC6900 board(configuring the new ejector levers)...................................................... 7-9

Figure 7-4Installing a BSC6900 board(configuring the old ejector levers)......................................................7-10

Figure 7-5Settings of DIP switch S2 on the MDMC board..............................................................................7-33

Figure 7-6Procedure for determining an operation...........................................................................................7-38

Figure 7-7Procedures for replacing an OMU board..........................................................................................7-39

Figure 7-8Removing an OMU board that is configured with new ejector levers.............................................7-44

Figure 7-9Installing an OMU board that is configured with new ejector levers...............................................7-45

Figure 7-10Removing an OMU board that is configured with old ejector levers.............................................7-46

Figure 7-11Installing an OMU board that is configured with old ejector levers..............................................7-47

Figure 7-12Replacing a WOPB board...............................................................................................................7-63

Figure 7-13Rear panel of the common power distribution box........................................................................7-68

Figure 7-14Rear panel of the high-power distribution box...............................................................................7-69

Figure 7-15DIP switch on the PFCU................................................................................................................7-74Figure 7-16DIP switch on the PFCU................................................................................................................7-75

Figure 7-17Jumper pins on the PFCB...............................................................................................................7-75

Figure 7-18Jumper pins on the PFCB...............................................................................................................7-76

Figure 7-19Removing the fan box.....................................................................................................................7-77

Figure 7-20Replacing an optical module..........................................................................................................7-79

Figure 7-21Distribution of the power switches in the MPR.............................................................................7-83

Figure 7-22Front panel of the power distribution box......................................................................................7-87

Figure 10-1Cover plate for the DIP switch on the subrack...............................................................................10-2

Figure 10-2Layout of the DIP switches on the EIUa board..............................................................................10-4

Figure 10-3DIP switch on the MDMC board....................................................................................................10-6

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Figure 10-4Layout of the DIP switch on the PAMU board..............................................................................10-7

Figure 10-5Layout of the DIP switches on the PEUa board.............................................................................10-8

Figure 10-6DIP switch on the PFCU board....................................................................................................10-11

Figure 10-7DIP switch on the PFCU board....................................................................................................10-11

Figure 10-8Pins on the PFCB board................................................................................................................10-12

Figure 10-9Pins on the PFCB board................................................................................................................10-13

Figures

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Tables

Table 2-1Maintenance items and tools for site maintenance...............................................................................2-2

Table 2-2Recommended BSC6900 spare parts...................................................................................................2-3

Table 3-1Maintenance items of the equipment room..........................................................................................3-2

Table 3-2Maintenance items of the power supply and grounding systems.........................................................3-3

Table 3-3BSC6900 cabinet maintenance items...................................................................................................3-4

Table 3-4Cable maintenance items......................................................................................................................3-5

Table 4-1Mapping between the power switches and the components in the MPR (configured with OMU board)/

EPR/TCR...............................................................................................................................................................4-2

Table 4-2Mapping between the power switches and the components in the MPR (configured with GBAM)

...............................................................................................................................................................................4-3

Table 4-3Mapping between the power switches and the components in the MPR/EPR/TCR............................4-4

Table 4-4Checklist for the power supply to the cabinet components..................................................................4-6

Table 4-5Handling power failures in the components in the cabinet..................................................................4-6

Table 7-1Strategy on replacing faulty legacy components of the BSC6900.......................................................7-4

Table 7-2OMU information table .....................................................................................................................7-41

Table 7-3Checklist for the new power distribution box....................................................................................7-70

Table 7-4Checklist for the new power distribution box....................................................................................7-72

Table 7-5Setting of the DIP switch on the PFCU.............................................................................................7-74

Table 7-6Setting of the DIP switch on the PFCU.............................................................................................7-75

Table 7-7Setting of the jumper pins on the PFCB.............................................................................................7-75

Table 7-8Setting of the jumper pins on the PFCB.............................................................................................7-76

Table 7-9Checklist for replacing the fan box....................................................................................................7-77

Table 7-10Parameters of optical modules.........................................................................................................7-79

Table 7-11Checklist for monitoring optical splitter/combiner replacement......................................................7-81Table 7-12Checklist for LAN switch replacement............................................................................................7-85

Table 7-13Checklist for GBAM replacement...................................................................................................7-87

Table 8-1Setting switches SW1 to SW6..............................................................................................................8-4

Table 8-2Checklist for power cable replacement................................................................................................8-5

Table 8-3Checklist for E1/T1 cable replacement................................................................................................8-7

Table 8-4Checklist for optical cable replacement...............................................................................................8-9

Table 8-5Checklist for Ethernet cable replacement...........................................................................................8-11

Table 8-6Checklist for clock signal cable replacement.....................................................................................8-12

Table 8-7Checklist for the new Y-shaped clock cable......................................................................................8-14

Table 8-8Checklist for inter-TNUa cable replacement.....................................................................................8-15

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Table 8-9Checklist for monitoring cable replacement...................................................................................... 8-19

Table 8-10Checklist for monitoring signal cable replacement..........................................................................8-21

Table 9-1LEDs on the DPUa board.....................................................................................................................9-3

Table 9-2LEDs on the DPUc board.....................................................................................................................9-3

Table 9-3LEDs on the DPUd board....................................................................................................................9-4

Table 9-4LEDs on the EIUa board......................................................................................................................9-5

Table 9-5LEDs on the FG2a board......................................................................................................................9-5

Table 9-6LEDs on the FG2c board......................................................................................................................9-6

Table 9-7LEDs on the GCUa board....................................................................................................................9-7

Table 9-8LEDs on the GOUa board....................................................................................................................9-7

Table 9-9LEDs on the GOUc board....................................................................................................................9-8

Table 9-10LEDs on the MDMC board................................................................................................................9-9

Table 9-11LEDs on the OIUa board....................................................................................................................9-9

Table 9-12LEDs on the OMUa/OMUb board...................................................................................................9-10

Table 9-13LEDs on the PAMU board...............................................................................................................9-11

Table 9-14LEDs on the PEUa board.................................................................................................................9-12

Table 9-15LEDs on the POUc board.................................................................................................................9-12

Table 9-16LEDs on the SCUa board.................................................................................................................9-13

Table 9-17LEDs on the TNUa board................................................................................................................ 9-14

Table 9-18LEDs on the XPUa board.................................................................................................................9-14

Table 9-19LEDs on the XPUb board................................................................................................................ 9-15

Table 10-1Description about the bits.................................................................................................................10-3

Table 10-2Setting of the DIP switch................................................................................................................. 10-3Table 10-3Description of the DIP switches on the EIUa board........................................................................10-5

Table 10-4Description of the different DIP switches........................................................................................10-6

Table 10-5DIP switch on the MDMC board.....................................................................................................10-6

Table 10-6DIP switch on the PAMU board...................................................................................................... 10-7

Table 10-7Description about DIP switches on the PEUa board........................................................................10-9

Table 10-8DIP switch on the PFCU board (in a fan box of the service subrack)...........................................10-11

Table 10-9DIP switch on the PFCU board (in the independent fan subrack).................................................10-12

Table 10-10Pins on the PFCB board (in a fan box of the service subrack)....................................................10-12

Table 10-11Pins on the PFCB board (in the independent fan subrack)..........................................................10-13

Table 11-1BSC6900 site maintenance record...................................................................................................11-1

Tables

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1Changes in the BSC6900 GSM SiteMaintenance Guide

This chapter describes the changes in the BSC6900 GSM Site Maintenance Guide.

05 (2011-05-19)

This is the fifth commercial release of V900R012C01.

Compared with issue 04 (2010-11-30), this issue includes the following new topics:

l 7.23 Replacing an Optical Splitter/Combiner

Compared with issue 04 (2010-11-30), this issue incorporates the following changes:

Content Description

8.2 Replacing an E1/T1 Cable The procedure of removing and connecting the fastening

screws on both ends of the cable is optimized.

8.7 Replacing an Inter-TNUa

Cable

The procedure of removing and connecting the fastening

screws on both ends of the cable is optimized.

Compared with issue 04 (2010-11-30), this issue does not exclude any topics.

04 (2010-11-30)

This is the fourth commercial release of V900R012C01.

Compared with issue 03 (2010-09-20), this issue does not include any new topics.


Content Description

7 Replacing Boards and

Modules

The description about the caution is optimized.

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03 (2010-09-20)

This is the third commercial release of V900R012C01.



Content Description

7.12 Replacing an OMU Board The procedure for this task is optimized.

Compared with issue 02 (2010-06-21), this issue doesnot exclude any topics.

02 (2010-06-21)

This is the second commercial release of V900R012C01.



Content Description

4.3 Powering On the Cabinet The description about the caution is optimized.


01 (2010-04-10)

This is the first commercial release of V900R012C01.

Compared with issue 03 (2009-12-05) of V900R011C00, this issue includes the following new

topics:

l 7.1 Strategy on Replacing Legacy Components in an Upgrade Scenario

l 7.10 Replacing an MDMC Board

l 7.17 Replacing a WOPB Board

l 7.24 Replacing the KVM

l 7.25 Replacing the LAN Switch

l 7.26 Replacing the GBAM

Compared with issue 03 (2009-12-05) of V900R011C00, this issue incorporates the following

changes:

1 Changes in the BSC6900 GSM Site Maintenance Guide

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Content Description

7.3 Replacing a DPUa/DPUc/

DPUd/DPUf Board

The procedure for replacing the faulty DPUa/DPUf board

is added.

7.20 Replacing the PowerDistribution Box

The procedure for replacing the faulty the common powerdistribution box is added.

Compared with issue 03 (2009-12-05) of V900R011C00, this issue does not exclude any topics.

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2Site Maintenance PreparationsAbout This Chapter

This chapter describes the preparations for the BSC6900 site maintenance, including the tool

and spare part preparations.

2.1 Site Maintenance Tool Preparations

This section lists the tools required for BSC6900 site maintenance. These tools must be placed

in the equipment room or at nearby places for easy access.

2.2 Spare Part Preparations

This section describes the spare parts required for BSC6900 site maintenance. These spare parts

must be placed in the equipment room or at nearby places for easy access.

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2.1 Site Maintenance Tool Preparations

This section lists the tools required for BSC6900 site maintenance. These tools must be placedin the equipment room or at nearby places for easy access.

Table 2-1lists the maintenance items and tools.

Table 2-1Maintenance items and tools for site maintenance

Item Tools

Cleaning the fan

box

ESD wrist strap, Phillips screwdriver, vacuum cleaner, ESD soft brush,

and clean cotton cloth

Cleaning the air

filters

ESD wrist strap, Phillips screwdriver, and clean cotton cloth

Replacing a board ESD wrist strap, Phillips screwdriver, flat-head screwdriver, ESD box

or bag, clean cotton cloth, and fiber cleaner

Replacing the fan

box, power

distribution box,

or subrack

ESD wrist strap, Phillips screwdriver, flat-head screwdriver, ESD box

or bag, diagonal pliers, dry cotton cloth, and fiber cleaner

Replacing the

cables

ESD wrist strap, Ethernet meter, Ethernet cable pliers, flat-head

screwdriver, clean cotton cloth, fiber cleaner, ESD gloves, and diagonal

pliers

Tools summary for

the BSC6900 site

maintenance

ESD gloves, ESD wrist strap, Phillips screwdriver, flat-head

screwdriver, ESD box or bag, dustfree cotton cloth, fiber cleaner,

Ethernet cable tester, Ethernet cable pliers, vacuum cleaner, ESD soft

brush, and diagonal pliers

2.2 Spare Part Preparations

This section describes the spare parts required for BSC6900 site maintenance. These spare parts

must be placed in the equipment room or at nearby places for easy access.

Spare Parts Selection Criteria

The principles for preparing the BSC6900 spare parts are as follows:

l When a board that works in independent mode is faulty, the board fault disrupts the services

carried on the board. Therefore, the priority to prepare a spare board for a board of this type

is high.

l When a board that works in resource pool mode is faulty, the board fault does not disrupt

the services, but only deteriorates the performance of the system in certain aspects.

Therefore, the priority to prepare a spare board for a board of this type is medium.

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l The filler panel is used for cabinet encapsulation and ventilation. It also ensures the

electromagnetic shielding and neatness of the cabinet. Therefore, the priority to prepare a

spare filler panel is medium.

l When a board that works in active/standby mode is faulty, the board fault does not affect

the services because the system automatically switches over the active and standby boards.Therefore, the priority to prepare a spare board for a board of this type is low.

Recommended Spare Parts List

Table 2-2describes the recommended BSC6900 spare parts.

Table 2-2Recommended BSC6900 spare parts

Spare Part Quantity

Fan box One for each site

Filler panel Two for each site

Power distribution

box

One for each site

Board One spare SCUa, DPUc, XPUa/XPUb, GCUa/GCGa, OMUa/OMUb,

and TNUa board for each site

One spare DPUa, DPUd, EIUa, OIUa, POUc, PEUa, FG2a/FG2c, and

GOUa/GOUc board for each site if these boards are configured

Optical module One spare optical module for each site if the optical module is configured

NOTE

The site operator can also apply for a site-specific quantity of spare parts according to its unique

requirement.

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3Routine Hardware Maintenance ItemsAbout This Chapter

This chapter describes the routine hardware maintenance items of the BSC6900. Different items

require different maintenance methods.

3.1 Equipment Room Maintenance Items

This section describes the maintenance items in the BSC6900 equipment room. The items

include the ambience alarm, anti-theft device, door and window, temperature, humidity, indoor

air conditioner, and dustproof condition.

3.2 Maintaining the Power Supply and Grounding Systems

This section describes the maintenance items of the BSC6900 power supply and the grounding

system. The maintenance items consist of power cables, voltage, PGND cables, components

inside the cabinet, earth resistance, batteries, and rectifier.

3.3 Cabinet Maintenance Items

This section describes the maintenance items of the BSC6900 cabinet. The maintenance items

consist of fans, air filters, cabinet surface, locks and doors of cabinet, cabinet cleanliness, fan

box cleanliness, ESD wrist strap, cabinet components, and idle optical ports on boards.

3.4 Cable Maintenance Items

This section describes the cable maintenance items. The maintenance items consist of cable

labels, connectors and sockets, connection of E1/T1 cables, connection of Ethernet cables, and

connection of optical cables.

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3.1 Equipment Room Maintenance Items

This section describes the maintenance items in the BSC6900 equipment room. The items

include the ambience alarm, anti-theft device, door and window, temperature, humidity, indoor

air conditioner, and dustproof condition.

Table 3-1lists the maintenance items of the equipment room.

Table 3-1Maintenance items of the equipment room

Item Interval Operation Guide ReferenceStandard

Alarms on

equipment room

environment

Daily Check whether power

supply alarms, fire

alarms, or smokealarms are generated.

No power supply

alarms, fire alarms, or

smoke alarms arereported.

Check anti-theft nets,

equipment room

doors, and windows

Weekly Check whether the

anti-theft nets, doors,

and windows are

intact.

The anti-theft device,

door, and window are

in good condition.

Check room

temperature

Daily Check the

temperature indicator

in the equipment

room.

The temperature is

between 15C and 30

C.

Check room

humidity

Daily Check the humidity

indicator in the

equipment room.

The humidity is

between 40% and

65%.

Check indoor air

conditioner

Weekly Check the running

status of the air

conditioner.

The air conditioner

works properly. The

temperature set on the

air conditioner is

consistent with that

on the thermometer.

Check dustproof

condition

Weekly Check the equipment

shell, equipmentinterior, floor, and

desktop.

The cabinet surface is

clean, and the cabinetinterior is dustfree.

3.2 Maintaining the Power Supply and Grounding Systems

This section describes the maintenance items of the BSC6900 power supply and the grounding

system. The maintenance items consist of power cables, voltage, PGND cables, components

inside the cabinet, earth resistance, batteries, and rectifier.

Table 3-2lists the maintenance items of the power supply and grounding systems.


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Table 3-2Maintenance items of the power supply and grounding systems

Item Interval Operation Guide Reference Standard

Power cables Monthly or

quarterly

Check all the power cables

between the power supplysystem and the power

distribution box of the

cabinet.

l The power cables are not

aged.l The PGND cables are

securely connected. The

connection points are not

corroded.

Voltage Monthly or

quarterly

Measure the voltage of the

power supply using a

multimeter.

The voltage of the power

supply is within the standard

voltage range. For details,

refer to Technical

Specifications of the Cabinet.

PGND cables Monthly orquarterly

Check all the PGNDcables and grounding

bars.

lThe PGND cables are notaged.

l The PGND cables are



corroded.

l The grounding bars are

not corroded. Proper anti-

corrosion measures are

taken.

Components

inside the

cabinet

Monthly or

quarterly

Check the connection

terminals and captive

screws of all the PGND

cables.

l The PGND cables are not

aged.

l The PGND cables are



corroded.

l The connection terminals

and captive screws are

securely and correctly

connected, and they are

not corroded.

Earthresistance

Monthly orquarterly

Use an electric earthresistance tester to

measure the earth

resistance and keep a

record.

The grounding resistance isless than 10 ohms.

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Batteries and

rectifier

Yearly Check the batteries and

rectifier of the power

supply system in each

equipment room.

l The batteries are normal.

There is no battery

leakage, swelling, or

corrosion.

l The capacity of all

batteries meets the

standard requirements

and the batteries are

correctly connected.

l The rectifier meets the

required specifications.

3.3 Cabinet Maintenance Items

This section describes the maintenance items of the BSC6900 cabinet. The maintenance items

consist of fans, air filters, cabinet surface, locks and doors of cabinet, cabinet cleanliness, fan

box cleanliness, ESD wrist strap, cabinet components, and idle optical ports on boards.

Table 3-3lists the maintenance items of the BSC6900 cabinet.

Table 3-3BSC6900 cabinet maintenance items


FansWeekly or

monthly

Check the running state of

the fans.

The fan works properly

without making abnormal

sounds.

Air filters QuarterlyCheck the air filters of

each cabinet.

The air filters are dust-free

and damage-free. Clean the

dirty air filter according to

6 Cleaning and Replacing

the Air Filters. Replace

the damaged air filter

according to 6.4 Replacing

the Air Filters.

Cabinet surfaceMonthly or

quarterly

Check the cabinet surface

and the cabinet labels.


intact. The labels are

legible.

Locks and

doors

Monthly or

quarterly

Check whether the lock is

normal and the door can be

opened and closed easily.

The locks and the doors of

the cabinet work properly.

Cleanness of

the cabinets

Monthly or

quarterly

Check whether the cabinet

is clean.


clean. The interior of the

cabinet is dust-free.


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Cleanness of

the fan boxYearly

Clean the fan box

according to 5 Cleaning

the Fan Box.

The surface of the fan box

is clean. The interior of the

fan box is dust-free.

Inside of the

cabinet

Monthly or

quarterly

Check the LEDs of every

component inside the

cabinet.

The LEDs work properly.

For details on the LEDs,

refer to the following part:

Front Panel of the High-

Power Power Distribution

Box, Fan Box (Configured

with the PFCU Board), Fan

Box (Configured with the

PFCB Board), 9 LEDs on

the Boards.

ESD wrist strap Quarterly

Measure the grounding

resistance of the ESD wrist

strap as follows:

l Use an ESD wrist strap

tester to test the ESD

wrist strap.

l Use a multimeter.

l When you use an ESDwrist strap tester, the

GOOD LED on it is

ON.

l When you use a

multimeter, the

grounding resistance of

the ESD wrist strap

ranges from 0.8

megohm to 1.2

megohms.

Protection of

the idle optical

ports on boards

Monthly or

quarterly

Check the dustproof caps

on the idle optical ports.

The dustproof caps are on

the idle optical ports.

3.4 Cable Maintenance Items

This section describes the cable maintenance items. The maintenance items consist of cable

labels, connectors and sockets, connection of E1/T1 cables, connection of Ethernet cables, and

connection of optical cables.

Table 3-4describes the cable maintenance items.

Table 3-4Cable maintenance items


Check

connectors and

sockets

Monthly or

quarterly

Check the insulators of

the connectors or the

sockets.

The insulators of the

connectors or the sockets

are clean.

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E1/T1 cableconnections

Yearly Check the connectionsof the E1/T1 cables.

l The E1/T1 cables are

properly connected.

l The E1/T1 cables areintact.

l The labels on the cables

are legible.

Ethernet cable

connectionsYearly

Check the connections

of the Ethernet cables.

l The Ethernet cables are

properly connected.

l The Ethernet cables are

intact.


are legible.

Optical cable

connectionsYearly

Check the connections

of the optical cables.

l The optical cables are

properly connected.

l The optical cables are

intact.


are legible.


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4Powering On/Off the BSC6900About This Chapter

This chapter describes how to power on and power off the BSC6900. The following is described:

the distribution of the power switches, powering on the BSC6900 cabinet, powering off the

BSC6900 cabinet in a normal situation, and powering off the BSC6900 cabinet in case of

emergencies.

4.1 Distribution of Power Switches on the Common Power Distribution Box

This section describes the mapping between the six routes of power outputs from the power

distribution box of the BSC6900 cabinet and the components in the BSC6900 cabinet.

4.2 Distribution of Power Switches on the High-Power PDB

The power distribution box of the MPR/EPR/TCR provides 20 (10 x 2) routes of power outputs.

This section describes the mapping between the eight routes of power outputs from the power

distribution box of the MPR/EPR/TCR and the components in the cabinet.

4.3 PoweringOn the Cabinet

This section describes how to power on the BSC6900 cabinet and how to handle common power

failures in the components of the cabinet.

4.4 Powering Off the Cabinet in a Normal Situation

This section describes how to power off the BSC6900 cabinet in a normal situation. You must

power off the BSC6900 cabinet before relocating the equipment or before a forecasted territorial

power blackout. Powering off the BSC6900 cabinet disrupts all the ongoing services. Therefore,power off the BSC6900 cabinet only when required.

4.5 Powering Off the Cabinet in Emergency Cases

This section describes how to power off the BSC6900 cabinet in emergency cases. To ensure

the security of the BSC6900 cabinet, the BSC6900 cabinet must be powered off in emergency

cases, such as fire, smoke, or water immersion.

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4.1 Distribution of Power Switches on the Common PowerDistribution Box

This section describes the mapping between the six routes of power outputs from the power

distribution box of the BSC6900 cabinet and the components in the BSC6900 cabinet.

Distribution of Power Switches on the Power Distribution Box of the MPR(Configured with OMU Board)/EPR/TCR

When the MPR is configured with the OMU board, the distribution of power switches on the

power distribution box of the MPR is the same as the distribution of power switches on the power

distribution box of the EPR/TCR. Figure 4-1shows the mapping between the six power switches

on the power distribution box and the components in the MPR (configured with OMU board)/

EPR/TCR. Table 4-1presents the mapping between the six power switches and the componentsin the MPR (configured with OMU board)/EPR/TCR.

Figure 4-1Mapping between the power switches and the components in the MPR (configured

with OMU board)/EPR/TCR

Table 4-1Mapping between the power switches and the components in the MPR (configured

with OMU board)/EPR/TCR

Component Power Switch on the Power Distribution Box

Subrack 2 SW1, SW4

Subrack 1 SW2, SW5


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Subrack 0 SW3, SW6

Distribution of Power Switches on the Power Distribution Box of the MPR(Configured with GBAM)

Figure 4-2shows the mapping between the six power switches on the power distribution box

and the components in the MPR that is configured with GBAM. Table 4-2presents the mapping

between the six power switches on the power distribution box and the components in the MPR

that is configured with GBAM.

Figure 4-2Mapping between the power switches and the components in the MPR (configured

with GBAM)

Table 4-2Mapping between the power switches and the components in the MPR (configured

with GBAM)


Subrack 1 SW1, SW4

Subrack 0 SW2, SW5

KVM SW3

LAN switch SW3

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GBAM SW3, SW6

4.2 Distribution of Power Switches on the High-Power PDB

The power distribution box of the MPR/EPR/TCR provides 20 (10 x 2) routes of power outputs.

This section describes the mapping between the eight routes of power outputs from the power

distribution box of the MPR/EPR/TCR and the components in the cabinet.

The power distribution box of the MPR/EPR/TCR provides eight routes of power outputs in two

groups (group A and group B), which are controlled by switches A7 to A10 and B7 to B10

respectively. Figure 4-3shows the mapping between the power switches on the power

distribution box and the components in the MPR/EPR/TCR. Table 4-3lists the mapping between

the power switches and the components.

Figure 4-3Distribution of power switches on the power distribution box of the MPR/EPR/TCR

Table 4-3Mapping between the power switches and the components in the MPR/EPR/TCR


Subrack 2 A8, B8

Subrack 1 A9, B9

Subrack 0 A10, B10


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Independent fan subrack A7, B7

4.3 Powering On the Cabinet

This section describes how to power on the BSC6900 cabinet and how to handle common power

failures in the components of the cabinet.

Prerequisite

l The surface of the input power cables is not damaged. The input power cables are correctly

and securely connected.

l The green and yellow PGND cable for the cabinet is properly connected.

l The power switches SW1 to SW6 (or A1 to A10 and B1 to B10) on the power distribution

box are set to OFF.

CAUTION

Ensure that the Checking and Setting the Subrack DIP Switch operation is performed before the

cabinet is powered on. After the cabinet is powered on, any modification to the setting of a DIP

switch on a subrack does not take effect.

Procedure

Step 1 Set the power switches that control the BSC power supply on the power distribution frame (PDF)to ON.

Step 2 Set the power switches on the power distribution box to ON after the RUN LED on the frontpanel of the power distribution box blinks every alternate 0.25s.

If the cabinet is... Then...

MPR, Set the corresponding power switches on the power distribution

box to ON. Then, go to Step 3.

EPR/TCR, Set the power switches that correspond to the subracksconfigured in the same cabinet to ON. Then, go to Step 4.

Step 3 Set the power switch on the front panel of the GBAM and the power switch on the rear panel ofthe KVM to ON if the GBAM is configured.

Step 4 Check the power supply to the cabinet components, as listed in Table 4-4.

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Table 4-4Checklist for the power supply to the cabinet components

Component Normal LED Status

Board The green RUN LED on the board panel blinks every

alternate second.

Fan box The green LED on the panel of the fan box blinks every

alternate second after the subrack/independent fan

subrack is powered on.

Power distribution monitor board The green RUN LED on the board panel blinks every

alternate second.

GBAM The main power LED on the front panel is on.

LAN switch The POWER LED on the front panel is on.

KVM The POWER LED on the keyboard is on.

Step 5 Power on the cabinet and then check the power supply to the components in the cabinet. Clearthe power failures, if any, according to Table 4-5.

Table 4-5Handling power failures in the components in the cabinet

Failure Type Handling Measures

Power failure in all the internal

parts of the cabinet

Check whether the -48 V power cables and the RTN power

cables are properly connected.

l If the cable connection is wrong, set all the powerswitches on the power distribution box to OFF, and then

reconnect the power cables.

CAUTIONSet the power switches that control the BSC power supply on

the PDF to OFF before reconnecting the power cables.

l If the cable connection is correct, replace the

Overvoltage Protection Board (WOPB). If the failure

persists, replace the power distribution box.

Power failure in all the boards

in a subrack

Use a multimeter to measure the input voltage of the subrack

l If the input voltage is between -40 V and -57 V, replace

the subrack.

l If the input voltage is not between -40 V and -57 V, check

the connections of the power cables. If the connections

of the power cables are loose, set the power switch on

the power distribution box corresponding to the subrack

to OFF and then reconnect the power cables. Otherwise,

replace the power distribution box because the power

switch on it may be faulty.


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Failure Type Handling Measures

Power failure in a certain board

in a subrack

Perform the following operations:

1. Check whether the board is securely connected. If the

board is not securely connected, reinstall the board.Observe the LEDs on the board panel. For details about

the states of the LEDs on the board panel, see 9 LEDs

on the Boards.

2. Remove the board, and check whether there is any

distorted pin, broken pin, or or if any pin is missing on

the board socket. Replace the subrack if there is a

distorted pin, broken pin, or if a pin is missing.

3. Reinstall the board, and observe the LEDs on the board

panel. For details about the states of the LEDs on the

board panel, see 9 LEDs on the Boards.

4. If the LEDs indicate that the board does not worknormally, remove the board and install it into an idle slot

that is for a board of the same type. Then, observe the

LEDs on the board panel.

l If the board works normally, it indicates that the slot

is faulty. In this case, replace the subrack.

l If the board does not work normally, it indicates that

the board is faulty. In this case, replace the board.

Power failure in the GBAM Use a multimeter to measure the input voltage of the GBAM.


the power modules of the GBAM.l If the input voltage is not between -40 V and -57 V, check



the power distribution box corresponding to the GBAM

to OFF and then reconnect the power cables. Otherwise,

replace the power distribution box because the power

switch on it may be faulty.

Power failure in any other part

in the cabinet

Use a multimeter to measure the input voltage of the faulty

component.


the component.

l If the input voltage is not between -40 V and -57 V, check



the power distribution box corresponding to the

component to OFF and then reconnect the power cables.

Otherwise, replace the power distribution box because

the power switch on it may be faulty.

----End

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4.4 Powering Off the Cabinet in a Normal Situation

This section describes how to power off the BSC6900 cabinet in a normal situation. You must

power off the BSC6900 cabinet before relocating the equipment or before a forecasted territorial

power blackout. Powering off the BSC6900 cabinet disrupts all the ongoing services. Therefore,

power off the BSC6900 cabinet only when required.

Prerequisite

l The green and yellow PGND cable for the cabinet is properly connected.

l The data on the BSC6900 is backed up. Back up the system data by referring to .

Context

To minimize the adverse impact on the BSC6900, power off the EPR/TCR before you poweroff the MPR.

Procedure

l In the case that the external GBAM is configured

1. Run the Telnet client, such as PuTTY, on the LMT PC. Enter the IP address of the

external GBAM and then log in to the GBAM as user root.

2. Run the poweroffcommand to shut down the external GBAM.

3. Set the power switch on the front panel of the external GBAM to OFF.

4. Set power switches SW1 to SW6 on the power distributionbox of the EPR/TCR toOFF.

5. If multiple EPR/TCRs are configured, repeat Step 4to power off all the EPRs/TCRs.

CAUTION

If only a few EPRs/TCRs are powered off, data inconsistency may occur.

6. Turn off the power switch on the rear panel of the KVM.

7. Set power switches SW1 to SW6 on the power distribution box of the MPR to OFF.

8. Set the power switches that control the BSC6900 power supply on the PDF to OFF.

l In the case that the OMU board is configured

1. Set the power switches corresponding to the subracks configured in the EPR. That is,

set the power switches A7 to A10 and B7 to B10 on the power distribution box to

OFF in sequence.

2. Flip open the ejector levers of the OMU board.

NOTE

Repeat this step if two OMU boards are configured. After you flip open the upper and lower

ejector levers, the OMU board automatically shuts down the operating system and hard disks.The OFFLINE LED on the board is on, which indicates that the board is powered off.


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3. After the OFFLINE LED on the OMU board is ON, set the power switches A7 to

A10 and B7 to B10 on the power distribution box to OFF in sequence.

4. Flip the ejector levers of the OMU board inwards until they are in position.

5. Set the power switches that control the BSC power supply on the PDF to OFF.

----End

4.5 Powering Off the Cabinet in Emergency Cases

This section describes how to power off the BSC6900 cabinet in emergency cases. To ensure

the security of the BSC6900 cabinet, the BSC6900 cabinet must be powered off in emergency

cases, such as fire, smoke, or water immersion.

Procedure

Step 1 Set all the switches on the power distribution box of the BSC6900 cabinet to OFF.

Step 2 If time permits, set the switches that control the power supply to the BSC6900 on the PDF toOFF.

----End

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5Cleaning the Fan BoxThis chapter describes how to clean a fan box. To ensure stability and reliability of the equipment,

the maintenance personnel should clean each fan box (including the fan boxes in the service

subracks and the fan boxes in the independent fan subrack) regularly, preferably once every

year.

Prerequisite

l The tools are ready. They are the ESD wrist strap, clean cotton cloth, ESD soft brush,

vacuum cleaner, and Phillips screwdriver.

l A clean backup fan box is ready for use.

Context

CAUTION

l To protect the components from electrostatic discharge, wear an ESD wrist strap properly.

Ensure that the ESD wrist strap is properly connected to the ESD connector on the cabinet.

If no ESD wrist strap or no proper grounding point is available, wear ESD gloves.

l Cleaning the fan box severely affects heat dissipation; therefore, you should replace the fan

box in less than one minute. Otherwise, the boards may be damaged due to high temperature.

Procedure

Step 1 Clean the backup fan box by using a clean cotton cloth, an ESD soft brush, and a vacuum cleaner.

Step 2 Use a Phillips screwdriver to open the front door of the cabinet and loosen the two captive screwson the fan box.

Step 3 Remove the fan box from the cabinet.

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DANGER

When replacing the fan box, do not put your hand inside the fan box. Otherwise, the revolving

fan blade may injure your fingers.

Step 4 Install the backup fan box into the cabinet and then fasten the captive screws to secure the fanbox.

Step 5 Clean the removed fan box with a clean cotton cloth, an ESD soft brush, and a vacuum cleaner.After being cleaned, the fan box is reserved as a backup for future use.

Step 6 Repeat Step 2through Step 5to replace other fan boxes.

----End

5 Cleaning the Fan Box

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6Cleaning and Replacing the Air FiltersAbout This Chapter

This chapter describes how to clean and replace an air filter. The air filter protects the boards

and the BSC6900 from dust. If an air filter is damaged, you must replace it with a new one in

time.

6.1 Position of the Air Filters

This section describes the position of the air filters in the BSC6900 cabinet. The air filters are

installed on the inner side of the front and back doors and at the bottom of the cabinet.

6.2 Cleaning the Air Filter at the Bottom of the N68E-22 Cabinet

This section describes how to clean the air filter at the bottom of the N68E-22 cabinet. The

maintenancepersonnel should clean the air filter at the bottom of each cabinet regularly,

preferably once every quarter.

6.3 Cleaning the Air Filter on the Inner Side of the Cabinet Door

This section describes how to clean the air filter on the inner side of the cabinet door. The

maintenancepersonnel should clean the air filters regularly, preferably once every quarter.

6.4 Replacing the Air Filters

This section describes how to replace a worn-out BSC6900 air filter. It takes about five minutes

to replace an air filter.

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6.1 Position of the Air Filters

This section describes the position of the air filters in the BSC6900 cabinet. The air filters are

installed on the inner side of the front and back doors and at the bottom of the cabinet.

Figure 6-1shows the position of the air filters in the single-door N68E-22 cabinet. Figure

6-2shows the position of the air filters in the double-door N68E-22 cabinet.

Figure 6-1Air filters in the single-door N68E-22 cabinet


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Figure 6-2Air filters in the double-door N68E-22 cabinet

NOTE

The air filter at the bottom of the cabinet is white, and fixed on the rack with screws. The other filters are

black, and fixed on the cabinet with binding strips.

6.2 Cleaning the Air Filter at the Bottom of the N68E-22Cabinet

This section describes how to clean the air filter at the bottom of the N68E-22 cabinet. The

maintenance personnel should clean the air filter at the bottom of each cabinet regularly,

preferably once every quarter.

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Prerequisite

The tools are ready. They are the ESD wrist strap, Phillips screwdriver, and dry cleaning cloth.

Context

CAUTION

To protect the components from electrostatic discharge, wear an ESD wrist strap properly.

Ensure that the ESD wrist strap is properly connected to the ESD connector on the cabinet. If

no ESD wrist strap or no proper grounding point is available, wear ESD gloves.

Procedure

Step 1 Open the front door of the cabinet and then remove the two screws from the air filter with aPhillips screwdriver, as shown in Figure 6-3.

Figure 6-3Removing the air filter from the bottom of the cabinet

Step 2 Hold the panel of the air filter frame with both hands and lift the frame slightly to raise the panelhigher than the screws fixing the grounding cables at the bottom of the cabinet. Then, pull the

frame out of the cabinet slowly and completely.

Step 3 Clean the air filter with water and wipe it up with dry cloth. Then, dry the air filter in a ventilatedplace.


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CAUTION

Do not place a wet air filter in the cabinet. The equipment may be damaged due to the short

circuit when the water is absorbed by the cabinet.

Step 4 Insert the clean air filter carefully along the guide rails into the cabinet. Do not push it forcibly.

Step 5 After the air filter is in position, fix the two screws on the air filter frame with a Phillipsscrewdriver, as shown in Figure 6-4.

Figure 6-4Installing the air filter at the bottom of the cabinet

----End

6.3 Cleaning the Air Filter on the Inner Side of the CabinetDoor

This section describes how to clean the air filter on the inner side of the cabinet door. The

maintenance personnel should clean the air filters regula

Bsc6900 Gsm Site Maintenance Guide 131210234714 Phpapp01

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