ZXG10 B8018 (V1[1].00) Maintenance Manual (Routine Maintenance)

ZXG10 B8018In-Door Base Transceiver Station

Maintenance Manual(Routine Maintenance)

Version 1.00

ZTE CORPORATION ZTE Plaza, Keji Road South, Hi-Tech Industrial Park, Nanshan District, Shenzhen, P. R. China 518057 Tel: (86) 755 26771900 800-9830-9830 Fax: (86) 755 26772236 URL: http://support.zte.com.cn E-mail: [email protected]

LEGAL INFORMATION Copyright 2006 ZTE CORPORATION. The contents of this document are protected by copyright laws and international treaties. Any reproduction or distribution of this document or any portion of this document, in any form by any means, without the prior written consent of ZTE CORPORATION is prohibited. Additionally, the contents of this document are protected by contractual confidentiality obligations. All company, brand and product names are trade or service marks, or registered trade or service marks, of ZTE CORPORATION or of their respective owners. This document is provided as is, and all express, implied, or statutory warranties, representations or conditions are disclaimed, including without limitation any implied warranty of merchantability, fitness for a particular purpose, title or non-infringement. ZTE CORPORATION and its licensors shall not be liable for damages resulting from the use of or reliance on the information contained herein. ZTE CORPORATION or its licensors may have current or pending intellectual property rights or applications covering the subject matter of this document. Except as expressly provided in any written license between ZTE CORPORATION and its licensee, the user of this document shall not acquire any license to the subject matter herein. The contents of this document and all policies of ZTE CORPORATION, including without limitation policies related to support or training are subject to change without notice.

Revision History

Date Revision No. Serial No. Reason for Revision

12/11/2006 R1.0 sjzl20061978 First edition

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ZXG10 B8018 (V1.00) In-Door Base Transceiver Station Maintenance Manual (Routine Maintenance)

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Contents

About this Manual........................................................... ix

Purpose.............................................................................. ix Intended Audience ............................................................... ix Prerequisite Skill and Knowledge ............................................ ix What is in This Manual.......................................................... ix Related Documentation.......................................................... x Conventions......................................................................... x How to Get in Touch............................................................. xi

Chapter 1..........................................................................1

Maintenance Overview ....................................................1

Routine Maintenance Methods.................................................1 Routine Maintenance Precautions ............................................2

Chapter 2..........................................................................5

Daily Maintenance Items.................................................5

Handling Current Alarms ........................................................5 Analyzing 24-Hour History Alarms ...........................................5 Analyzing 24-Hour History Notifications....................................6 Querying Real-time Status of Each BTS Cell ..............................6 Analyzing Daily Cell Performance Report ..................................7 Handling Subscribers Complaints.............................................7

Chapter 3..........................................................................9

Weekly Maintenance Items.............................................9

Analyzing Weekly History Alarms.............................................9 Analyzing Weekly History Notification Messages ...................... 10 Analyzing Alarm Frequency .................................................. 10 Analyzing Weekly Cell Performance Report ............................. 11

Chapter 4........................................................................13

Monthly Maintenance Items..........................................13

Analyzing Monthly Cell Performance Report.............................13 Checking Spare Parts...........................................................13

Chapter 5........................................................................15

Quarterly Maintenance Items........................................15

Testing Call, Coverage, and Handover ....................................15 Equipment Room Maintenance ..............................................15 Checking Main Equipment.....................................................18 Power Check.......................................................................19 Checking the Running Status of Boards ..................................20

Chapter 6........................................................................27

Annual Maintenance Items............................................27

Checking Main Equipment.....................................................27 Measuring Amplifier Output Power .........................................28 Measuring VSWR.................................................................30 Clock Calibration (Optional for the BTS with Internal Synchronization) .................................................................31 Cleaning Air Filters of the Cabinet ..........................................33 Checking Lightning Arresters.................................................34 Checking Grounding Cables ..................................................35 Measuring the Grounding Resistance ......................................35 Checking Antenna Feeder Interface........................................36 Checking the Firmness of Antennas and Tower ........................36 Checking the Tilt of Directional Antennas ................................36 Checking Waterproof Status of Feeder Connectors and Lightning Protection Grounding Clips....................................................39 Checking Iron Towers (Optional) ...........................................39 Checking the Mast (Optional) ................................................39 Checking Running Status of Transmission Equipment................40 Checking Running Status of Storage Batteries .........................40

Chapter 7........................................................................41

Routine Maintenance Record Forms .............................41

Daily Maintenance Record Form.............................................41 Weekly Maintenance Record Form..........................................43 Monthly Maintenance Record Form.........................................44 Quarterly Maintenance Record Form.......................................45

Annual Maintenance Record Form.......................................... 46 Emergency Troubleshooting Record Form ............................... 47 Board Replacement Data Record Form ................................... 48

Appendix A.....................................................................49

Board Replacement........................................................49

Board Replacement Overview ............................................... 49 CMB Replacement ............................................................... 50 DTRU/EDTRU Replacement................................................... 52 AEM Replacement ............................................................... 53 EIB/FIB Replacement........................................................... 54 PDM Replacement ............................................................... 55 BBCM- Control and Maintenance Backplane Board Replacement. 57 BBTR- Transceiver Backplane Board Replacement.................... 58 Fan Module Replacement ..................................................... 59 Dust Proof Plug-in box Replacement ...................................... 61 Trunk Cable Replacement..................................................... 62 RF Cable Replacement ......................................................... 63 Cabinet-Top 1/2'' Soft Jumpers Replacement .......................... 64

Appendix B.....................................................................67

Abbreviations.................................................................67

Appendix C .....................................................................69

Figures............................................................................69

Tables.............................................................................71

Index..............................................................................73

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Confidential and Proprietary Information of ZTE CORPORATION ix

About this Manual

Purpose

The purpose of this manual is to check the equipment status periodically in order to find and resolve the problems in time. This prevents crucial damages and system faults.

Intended Audience

This document is intended for engineers and technicians who perform operation activities on the ZXG10 B8018.

Prerequisite Skill and Knowledge

To use this document effectively, users should have a general understanding of wireless telecommunications technology. Familiarity with the following is helpful:

GSM Technology and equipments

ZXG10-BSS and its various components

ZXG10-BTS (V2) series and its technical and hardware details

What is in This Manual

This Manual contains the following chapters:

T AB L E 1 C H A P T E R S U M M AR Y

Section Summary

Chapter 1, Maintenance Overview This chapter describes the overview of B8018 maintenance process.

Chapter 2, Daily Maintenance Items This chapter describes the daily maintenance including 24 hour history and notification alarms, handling subscribers complaints and querying

ZXG10 B8018(V1.00)In-Door Base Transceiver Station Maintenance Manual(Routine Maintenance)

x Confidential and Proprietary Information of ZTE CORPORATION

Section Summary

current status of BTS.

Chapter 3, Weekly Maintenance Items This chapter describes the weekly maintenance items as analyzing alarms frequency, weekly cell performance and weekly history and notification alarms.

Chapter 4, Monthly Maintenance Items This chapter describes the monthly maintenance items including monthly cell performance report and checking spare parts.

Chapter 5, Quarterly Maintenance Items

This chapter describes the procedure of checking main equipment, boards, power check and testing call service and coverage area.

Chapter 6, Annual Maintenance Items This chapter describes B8018 annual maintenance. It contains the amplifiers output power check, antenna system check, transmission system check, grounding, VSWR check, cleaning air filter, checking lightning arresters, and condition of storage batteries..

Chapter 7, Routine Maintenance Record Forms

This chapter contains the record forms used during the routine maintenance of B8018.

Appendix A, Board Replacement This chapter describes the board replacement procedure in B8018.

Related Documentation

The following documents are related to this manual:

ZXG10 B8018 (V1.00) In-Door Base Transceiver Station Documentation Guide

ZXG10 B8018 (V1.00) In-Door Base Transceiver Station Technical Manual

ZXG10 B8018 (V1.00) In-Door Base Transceiver Station Installation Manual

ZXG10 B8018 (V1.00) In-Door Base Transceiver Station Maintenance Manual (Troubleshooting)

Conventions

ZTE documents employ the following typographical conventions. Typographical Conventions

About this Manual

Confidential and Proprietary Information of ZTE CORPORATION xi

T AB L E 2 TY P O G R AP H I C AL C O N V E N T I O N S

Typeface Meaning

Italics References to other Manuals and documents.

Quotes Links on screens.

Bold Menus, menu options, function names, input fields, radio button names, check boxes, drop-down lists, dialog box names, window names.

CAPS Keys on the keyboard and buttons on screens and company name.

Constant width Text that you type, program code, files and directory names, and function names.

[ ] Optional parameters.

{ } Mandatory parameters.

| Select one of the parameters that are delimited by it.

Note: Provides additional information about a certain topic.

Checkpoint: Indicates that a particular step needs to be checked before proceeding further.

Tip: Indicates a suggestion or hint to make things easier or more productive for the reader.

T AB L E 3 M O U S E OP E R AT I O N C O N V E N T I O N S

Typeface Meaning

Click Refers to clicking the primary mouse button (usually the left mouse button) once.

Double-click Refers to quickly clicking the primary mouse button (usually the left mouse button) twice.

Right-click Refers to clicking the secondary mouse button (usually the right mouse button) once.

Drag Refers to pressing and holding a mouse button and moving the mouse.

How to Get in Touch

The following sections provide information on how to obtain support for the documentation and the software.

If you have problems, questions, comments, or suggestions regarding your product, contact us by e-mail at [email protected]. You can also call our customer support center at (86) 755 26771900 and (86) 800-9830-9830.

Mouse Operation

Conventions

Customer Support


xii Confidential and Proprietary Information of ZTE CORPORATION

ZTE welcomes your comments and suggestions on the quality and usefulness of this document. For further questions, comments, or suggestions on the documentation, you can contact us by e-mail at [email protected]; or you can fax your comments and suggestions to (86) 755 26772236. You can also browse our website at http://support.zte.com.cn, which contains various interesting subjects like documentation, knowledge base, and forum and service request.

Documentation Support

Confidential and Proprietary Information of ZTE CORPORATION 1

C h a p t e r 1

Maintenance Overview

This chapter contains the following topics:

Routine maintenance methods

Routine maintenance precautions

Routine Maintenance Methods

The common methods for finding and removing faults are as follows:

Check alarms using alarm management and operation log of BSS operation & maintenance subsystem in OMCR.

Observe and analyze alarm messages

Observe and analyze the alarm messages reported by each Network Element (NE), such as, current alarms, history alarms, and common notification messages. This method helps to locate and resolve the faults, while the network is running.

Observe operation log

Observe operation log through user management to trace modifications in system parameters. Locate the relevant terminal and detect the fault in time.

LED status analysis

Locate and remove the fault by observing the indicator status on the panel of each board in the B8018 cabinet. The maintenance staff should be well familiar with the status and meaning of all indicators on each board.

Performance analysis


2 Confidential and Proprietary Information of ZTE CORPORATION

Carry out performance management and signaling trace through the performance management interface of OMCR. The steps include the following:

Using performance management interface

Create different performance measurement tasks, generate different performance report, and understand the performance indices of BSS. By analyzing the information, detect the distribution of load in the network and adjust network parameters in time to improve the network performance.

Through the signaling trace interface

Trace the signaling involved in the BSS. This helps the relevant engineers to consult various signaling procedures during maintenance and discover the signaling problems.

Fault analysis with auxiliary instruments

Use auxiliary instruments such as the test MS, signaling analyzer, and BER analyzer to analyze, locate, and remove faults.

Plugging/unplugging of modules

Unplug and then plug the defective modules and external interface connectors. This resolves the fault caused by the poor contacts.

Comparison and replacement

Replace the defective board with a normal board in the similar position in order to confirm the status of the board and slot.

Isolation

Isolate the part of the defective board from the other relevant boards or racks. This helps to find out that if the fault is due to the interaction between them.

Self-test

Run the self-test after powering on. The LEDs on the panel flash in a certain pattern. Examine the board based on LED pattern.

Routine Maintenance Precautions

Following matters need attention during routine maintenance.

The equipment room should be clean. Ensure the normal temperature and humidity conditions. Take preventions against dust and dampness.

Ensure the stability and reliability of the primary power system. Check the system grounding and the lightning ground on periodic basis. In particular, check the lightning

Chapter 1 - Maintenance Overview


protection system before storm season and after thunderstorm to ensure that the facilities are in good condition.

Perform regular routine maintenance. Maintain a complete log to provide detailed records on system operation, version, data changes, upgrading, and troubleshooting. Keep shift records to identify the responsibilities. This helps in the future analysis and troubleshooting.

The maintenance personnel should be well trained and have appropriate knowledge about the equipment and networks before taking the post. Before handling the equipment, wear antistatic wrist strap to avoid accidents.

Running signaling tracing program is highly forbidden in the daytime, when traffic is high. Signaling tracing can only be performed under the conditions permitted by ZTE Customer Service Department and in low-traffic time periods.

Make sure that the spare-parts are not affected by moisture or mould. Ensure sufficient stock of commonly used spare-parts. Keep the spare-parts separate from the defective parts and label them for convenience.

The light intensity in the equipment room should be strong enough for maintenance. Ensure that there should be no dark corner that causes maintenance inconveniences.

Remove the fault without delay. Contact the local office of ZTE CORPORATION immediately for the unresolved faults.

Place the contact information of the local ZTE office at a visible place so that the maintenance staff can contact ZTE in time.



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C h a p t e r 2

Daily Maintenance Items

This chapter explains the following topics:

Handling current alarms

Analyzing 24-hours history alarms

Analyzing 24-hours history notifications

Querying real time status of each BTS

Analyzing daily cell performance report

Handling subscriber complaints

Handling Current Alarms

ZXG10 Alarm Management interface in the OMCR client

1. Click Fault Management in the OMCR topological view and select Alarm management.

2. In the ZXG10 Alarm Management interface, select View > Physical View from the menu bar.

3. From the left pane, select GSM Equipment > Physical Site to view the current alarms of the BTS site in the right pane.

There is no abnormal alarm of the BTS in the alarm view.

Double-click the alarm to get the alarm details. Resolve the alarm according to the System method in Details window.

Analyzing 24-Hour History Alarms



Tools

Test Procedure

Normal Result

Troubleshooting

Tools

Test Procedure



2. In the ZXG10 Alarm Management interface, select File > Alarm History Query from the menu bar to start Alarm Query Wizard.

i. Select the History Alarm as Alarm Type.

ii. Set the past 24 hours as the start time/end time, and then select the BTS to be queried from the alarm source to query all history alarms.

No frequent abnormal alarm or alarms occur and the alarm history query displays normal results.

Analyze the abnormal alarms or frequent alarms in detail. Find the causes, and resolve the frequent or abnormal alarms as appropriate.

Analyzing 24-Hour History Notifications




i. Select the Information as Alarm Type.

ii. Set the past 24 hours as the start time/end time, and then select BSC and OMCR Information from the source to query all history notification messages.

No frequent exception notification message occurs and the notification message query displays normal results.

Analyze the frequent exception notification messages in detail. Find the causes, and resolve the notification messages.

Important! Focus on history notification messages related to BTS and Abis interface transmission during history notification messages analysis.

Querying Real-time Status of Each BTS Cell

ZXG10 Dynamic Data Management interface in the OMCR client

1. Click Configuration Management in the OMCR topological view and select Dynamic data management.

Normal Result

Troubleshooting

Tools

Test Procedure

Normal Result

Troubleshooting

Tools

Test Procedure

Chapter 2 - Daily Maintenance Items


2. In the left pane of ZXG10 Dynamic Data Management interface of the OMCR client, do the following:

i. To display the configurations and real-time status of the traffic and signaling channels of the current cell, right-click the BTS Site Manager > Cell, and select QueryChanStastic.

ii. For watching the real-time status of channels in the transceivers, click Cell > TRX. Right-click on the lower-right pane and click Refresh.

The status of the cell channel is normal and there is no blocked channel. Traffic channels are seized in real-time.

Refer to BTS alarms in the alarm management interface to resolve the blocked channels of the BTS. If there is no or abnormal channel seizure (for example, the channel is released once it is seized), use alarm management with signaling tracing to resolve.

Analyzing Daily Cell Performance Report

ZXG10 Performance Analyzer interface in the OMCR client

1. Click Performance Management in the OMCR topological view and select Performance analyzer.

2. In the ZXG10 Performance Analyzer interface, select Report > Create Performance Report from the menu bar to create a cell performance report.

The performance indices in the report are normal.

Resolve the abnormal indices in the performance report as appropriate.

Handling Subscribers Complaints

Test and solve the faults based on subscribers complaints. Give suggestions to the subscribers about the simple ways of problem solution and update them frequently.

Normal Result

Troubleshooting

Tools

Test Procedure

Normal Result

Troubleshooting


C h a p t e r 3

Weekly Maintenance Items


Analyzing weekly history alarms

Analyzing weekly history notification messages

Analyzing alarm frequency

Analyzing weekly cell performance report

Analyzing Weekly History Alarms




i. Select the History Alarm as Alarm Type.

ii. Set the past week as the start time/end time, and then select BSC to be queried from the alarm source to query all history alarms.

The indices in the alarm query result are normal. There is no alarm that occurs often.

Analyze in detail the alarms that occur often. Find their causes and remove them.

Tools

Test Procedure

Normal Result

Troubleshooting



Analyzing Weekly History Notification Messages




i. Select the Information as the Query Type.

ii. Set the past week as the start time/end time, and then select BSC from the alarm source to query all common notification messages.

No frequent exception notification message occurs and alarm query displays normal results.

Analyze in detail the exceptional notification messages that often occur, find their causes and remove them. Check the quality of the relevant transmission link for the notification messages that often occur at the Abis transmission interface, such as slip notification message and Rx alarms.

Analyzing Alarm Frequency



2. In the ZXG10 Alarm Management interface, select File > Alarm Statistics > Alarm Frequency Statistics from the menu bar to see Alarm Frequency Statistics window.

i. Select relevant BTS from the Source tab.

ii. Set the past week as the start time/end time from the Time tab. Click on the Custom radio option below and select 30 from the list item to be read as The Most 30 Kinds of Alarms.

Alarm frequency analysis results are normal.

Analyze in detail the alarms that often occur, find their causes and remove them.

Tools

Test Procedure

Normal Result

Troubleshooting

Tools

Test Procedure

Normal Result

Troubleshooting

Chapter 3 - Weekly Maintenance Items


Analyzing Weekly Cell Performance Report




The performance indices in the report are normal.

Resolve the abnormal indices in the performance report as appropriate.

Tools

Test Procedure

Normal Result

Troubleshooting


C h a p t e r 4

Monthly Maintenance Items


Analyzing monthly cell performance report

Checking spare parts

Analyzing Monthly Cell Performance Report




The performance indices of the cells are stable.

Focus on the optimization of the cell with the poorest performance. Analyze the cells with significant index changes in detail, and locate the causes.

Checking Spare Parts

None

Check the spare parts and their condition against the spare parts list.

Note: Keep the damaged parts separate from the new and good-conditioned parts. Mark the items for convenience.

The spare parts are complete and in good condition.

Tools

Test Procedure

Normal Result

Troubleshooting

Tools

Test Procedure

Normal Result



Arrange supplementary common spare parts in time before these parts are used.

Troubleshooting


C h a p t e r 5

Quarterly Maintenance Items


Testing call, coverage and handover

Equipment room maintenance

Checking main equipment

Power check

Checking running status of boards

Testing Call, Coverage, and Handover

Test MS and drive testing tools

Test the conversation, coverage, and handover of the BTS with a test MS and drive testing tools.

The conversation quality is good. There is no call loss during the handover, and the BTS coverage is normal.

Resolve the problems found during the tests.

Equipment Room Maintenance

For the maintenance of equipment room, perform the following checks:

Tools

None

Test Procedure

Check the burglar nets, windows, doors, and other items.

Tools

Test Procedure

Normal Result

Troubleshooting

Room Condition

Check



Normal Result

The burglar nets, windows, and doors are intact.

Troubleshooting

Repair the items in time if they are damaged.

Tools

None

Test Procedure

Observe the temperature in the equipment room from the thermometer.

Normal Result

Operating temperature: -5 C to 45 C

Troubleshooting

Adjust the air conditioner(s) to maintain the normal temperature conditions.

Tools

None

Test Procedure

Check the humidity in the equipment room from the hygroscope.

Normal Result

Operating-room humidity: 15% - 90%

Troubleshooting

Adjust the air conditioner(s) to maintain the normal humidity conditions.

Tools

None

Test Procedure

Check the operation of the air conditioner(s) in the equipment room and clean the air filters periodically.

Normal Result

Air conditioner(s) ensures the normal and effective cooling of the equipment room.

Troubleshooting

Repair the air conditioner(s) in time.

Temperature Check

Humidity Check

Air Conditioner(s)

Check

Chapter 5 - Quarterly Maintenance Items


Tools

None

Test Procedure

Check if the equipment room floor, cabinets, doors and windows, equipment documentation, and equipment interior and floor are clean.

Normal Result

All facilities remain clean and tidy without obvious dust.

Troubleshooting

Clean the dust. Find out the reasons of poor dust conditions and take the corresponding dustproof measures.

Tools

None

Test Procedure

Check the general lighting and emergency lighting in the equipment room.

Normal Result

The lighting is normal and covers every corner.

Troubleshooting

Repair the damaged lighting facilities in time.

Tools

None

Test Procedure

Check if the sockets in the equipment room are normal.

Normal Result

The sockets in the equipment room are normal.

Troubleshooting

Repair the sockets in time if the sockets are damaged.

Tools

None

Test Procedure

Check for the disaster protection facilities, equipment protection, and firefighting facilities in the equipment room.

Cleanliness Check

Lighting Check

Sockets Check

Safety Check



Normal Result

The equipment room includes handheld fire extinguishers that have normal pressure and fall within the validity period. The equipment room is rodent-free and insect-free.

Troubleshooting

Repair or replace the damaged firefighting facilities in time.

Tools

None

Test Procedure

Check the environment alarm collection items such as temperature, humidity, fire alarm, power supply, and burglarproof facilities in the equipment room.

Normal Result

The environment alarm collection facilities in the equipment room are normal.

Troubleshooting

Repair or replace the damaged environment alarm collection facilities in time.

Checking Main Equipment

Check the BTS equipment by visually observing its condition. BTS equipment check includes following confirmation checks.

Cable connection check

Module connection check

Feeder connection check

For cable connection check, perform the following steps:

1. Check all the cables and make sure their connections are according to the installation report.

2. Input and output cables of modules must be attached.

3. Make sure that the terminals of power cable are correct.

4. Check the connection between BTS and BSC.

5. Confirm the connection of grounding cable.

6. Check the cable condition; make sure they are not broken.

For module connection check, perform the following steps:

1. Check the position of modules.

2. Make sure that all modules are properly connected in their respected slots.

Environmental Alarm

Collection Facilities

Check

Cable Connection

Check

Module Connection

Check



3. Check the input power connection of all modules.

4. Check the transmission power of Transmission modules.

For feeder connection check, perform the following steps:

1. Check the relationship between cells and feeders.

2. Check the feeder cable connection, tighten it if loose.

3. Test the SWR values of feeder cables and DTRM; they must be according to the given standard.

Power Check

Power check includes three types:

Main power check

Modules power check

Fan power check

Following steps are necessary for main power check:

1. Switch off the power-switch on the top of BTS, and the circuit breakers on the PDM.

2. Measure the input power to the BTS and make sure the polarity must be same.

3. Voltage range must be according to the given standard (AC 220 V with variation of 130 V ~ 300 V, DC -48 V with variation of -57 V ~ -40 V)

Note: During the above test process, if any abnormality occurs then turn off the power switch and troubleshoot. If power lines are alright but the Rack does not get the input current, it means that main-switch power threshold settings are not correct.

Module power check comes after the main power check. For module power check, perform the following steps:

1. Turn ON the power switch on the top of BTS.

2. Turn ON the circuit breakers of every module on the PDM. The sequence of turning on the circuit breakers should be from top to bottom, according to position of modules in the cabinet.

3. Observe the power indicators on the modules, if they are not in normal state then troubleshoot immediately.

4. If any of the modules goes to rest position repeatedly, check the board plug-in condition and its input voltage. Also, check whether the chip is inserted correctly and chip model, saved content, and version are correct

Feeder Connection Check

Main Power Check

Module Power Check



For the fan power test, perform following steps:

1. Observe that whether the fans are working normally and blowing the air in the correct direction.

2. If any of the fans are not working, turn off the circuit breaker of that fan and check the power lines inside it.

3. If power lines inside the faulty fan are correct, then check the power lines inside the cabinet and correct them.

Checking the Running Status of Boards

In order to check the running status of boards, check the alarm indicators on the panels. Check the status of the following alarms in order to ensure the correct running state of the system.

CMB status indication alarms

AEM status indication alarms

DTRU status indication alarms

Observe the CMB status indication alarms according to Table 4.

T AB L E 4 CMB S T AT U S I N D I C AT I O N AL AR M S

Indicator Name

Color Description Status Working Mode

Green ON Normal PWR

GREEN/RED

Power indicator

Red ON orAlarm OFF

Power Failure

Flashes (4 Hz)

Boot Running

RUN

GREEN

Running indicator

Flashes (1 Hz)

System Abnormal

Green ON Abis Interface Network Synchronization clock

Green Flashes ( 1 Hz)

SDH Synchronization clock

SYN

GREEN/RED

Clock Synchronization Indicator

RED Flashes ( 1 Hz)

E1 Out of Frame

Fan Power Check

CMB Status Indication

Alarms



Indicator Name

Color Description Status Working Mode

RED ON E1-Line disconnected

Green ON Network Synchronization is in lock status

CLK

GREEN/RED

Clock Indication

RED ON Clock Failure

Green ON Active

MST GREEN Active/standby Indication

Green OFF Standby

OFF Normal RUNNING

Green Flashes (1 Hz)

System installation (Low) see note 3


Software Loading

RED Flashes (1 HZ)

LAPD link broken (high) see note 1

RED Flashes (4 Hz)

HDLC Link Broken (Low) See Note 2.

STA

GREEN/RED

Status Indication

RED ON All Alarms

Note:

1. LOW and HIGH indicate Periority.

2. There is no LAPD link break Alarm on CMB.

3. No HDLC alarm will be generated on the active CMB of the master cabinet. The HDLC link break alarm on the active CMB of the slave cabinet is defined as CCComm indication (communication between the active CMBs of the cabinet). HDLC link broken alarm of all the slave CMMs is defined as CCComm indication (between Master and Slave CMBs).

AEM status indication alarms are given in Table 5. Observe the AEM status indication alarms according to the following table information.

AEM Status Indication

Alarms



T AB L E 5 AEM S T AT U S I N D I C AT I O N AL AR M S

Indicator Name

Description Color Working Mode

ON: NORMAL

FPO

Indicator for the Normal output of Forward power

GREEN

Off: Abnormal

ON: Alarm Reported

SWR 1

SWR Alarm 1 Indicator

RED

No Alarm Reported

ON: Alarm Reported

SWR 2

SWR Alarm 2 indicator

RED OFF:

No Alarm Reported

ON: Normal

PWR

Indicator of LNA Power supply

GREEN

OFF: Abnormal

ON: Alarm Reported

LNA

LNA Alarm Indicator

RED OFF: No Alarm

Reported

Observe the DTRU status indication alarms according to Table 6.

T AB L E 6 DTRU S T AT U S I N D I C AT I O N AL AR M S

Name of Indicator

Description Color Status Working Mode

Green ON

Normal

PWR

Power Indicator

Green/Red

RED ON Or Alarm Off

Power Failure

DTRU Status Indication

Alarms



Name of Indicator


Flashes (4 Hz)

Boot Running

RUN

Running Indication

Green

Flashes (1 Hz)

System Abnormal

OFF

Both carriers are not BCCH

Green Solid ON

Both carriers are BCCH but with non broadcasting system Info

(Duty ratio 3/4) Left carrier is not BCCH, Right carrier is BCCH.

Green Flashes (0.25 Hz)

(Duty ratio 1/4) Left carrier is BCCH, Right carrier is not BCCH.

MOD

Channel Mode indication

Green/Red

RED ON BCCH Blocking

Green ON

Channel-Activation Indication; See Note

Red Flashes

Channel-blocking Indication; See Note

ACT 1

Channel Activation Indication for TRX 1

Green/Red

Red ON Control Unit Prohibition

Green ON

Channel-Activation Indication; See Note



Name of Indicator


Red Flashes

Channel-blocking Indication; See Note

ACT 2

Channel Activation Indication for TRX 2

Green/Red

Red ON Control Unit Prohibition

OFF Normal running


System-Initialization (low); See Note

Green Flashes (4 HZ)

Software loading (High)

Red Flashes (1 HZ)

LAPD link Broken (High)

Red Flashes (4 Hz)

HDLC link Broken (Low)

STA

Status Indication

Green/Red

Red ON All Alarms Indication

Note: The green MOD LED represents an interim status. It is abnormal if the green LED is solid on, indicating that the DTRU has not received any System Info message. The channel activation LED (ACT) shows the number of activated channels. According to the number of channels activated, the DTRU will adjust the LED control pulse width to display the number of channels activated. For details, refer to Table 7.

T AB L E 7 D I S P L AY O F C H AN N E L AC T I V AT I O N ( ACT) LED

Number of Activated Timeslots LED Display

0 00000000,00000000

1 10000000,00000000

2 10100000,00000000

3 10101000,00000000



Number of Activated Timeslots LED Display

4 10101010,00000000

5 10101010,10000000

6 10101010,10100000

7 10101010,10101000

8 10101010,10101010


C h a p t e r 6

Annual Maintenance Items


Checking main equipment

Measuring Amplifier output power

Measuring VSWR

Clock calibration (Optional for the BTS with internal synchronization)

Cleaning air filters of the cabinet

Checking lightning arresters

Checking grounding cables

Measuring the grounding resistance

Checking antenna feeder interface

Checking firmness of antenna and power

Checking the tilt of directional antenna

Checking waterproof status of feeder connectors and lightning clips

Checking iron towers( Optional)

Checking the mast (Optional)

Checking the running status of transmission equipment

Checking the running status of storage batteries

Checking Main Equipment

For main equipment check, see topic Checking main equipment in chapter 5, Quarterly Maintenance Items.



Measuring Amplifier Output Power

Following tools are required:

One 3 1/2 digital multi-meter

One 150 W through-line power meter

Several RF cables

Other metals

1. Turn off the DTRM power supply. The DTRU power switch is on the PDM front panel, as shown in Figure 1.

F I G U R E 1 PO W E R S W I T C H O F DTRU

The physical correspondence between power switches DTRU1 DTRU9 and the controlled carriers is shown in Table 8.

T AB L E 8 C O R R E S P O N D E N C E B / W DTRU1 T O DTRU12 & C AR R I E R S

Power Switch

Carrier Power Switch

Carrier

DTRU1 The first carrier module in the third-layer carrier shelf

DTRU7 The first carrier module in the first-layer carrier shelf

DTRU2 The second carrier module in the third-layer carrier shelf

DTRU8 The second carrier module in the first-layer carrier shelf

DTRU3 The third carrier module in the third-layer carrier shelf

DTRU9 The third carrier module in the first-layer carrier shelf

Tools

Test Procedure

Chapter 6 - Annual Maintenance Items


Power Switch

Carrier Power Switch

Carrier

DTRU4 The first carrier module in the second-layer carrier shelf

-

DTRU5 The second carrier module in the second-layer carrier shelf

- -

DTRU6 The third carrier module in the second-layer carrier shelf

- -

2. If Transceiver Unit (TRU) does not output power on turning off the power supply, do the following:

i. Loosen the cable connectors from the amplifier output end to AEM.

ii. Connect the cable connectors with a through-line power meter and a large-power load.

Caution: If the connector is not connected with any antenna, it must be connected with a 100 W microwave power load. If power load is connected with an antenna, then it does not need to be connected with any load.

3. Turn on the power and add the stimulation (there is output from the TRU).

4. Read the power of the set frequency band (GSM900: 925 MHz 960 MHz; GSM1800: 1805 MHz 1880 MHz). In case of full power, read the output power and the gain flatness.

The output power is more than 60 W for GMSK and 40 W for 8PSK.

1. For 80 W BTS, if the amplifier output power fails to meet the technical specifications, check if the TRU output level is within the allowed range. If it is normal, then check power amplifier for the fault.

2. Common problems of a power amplifier include the following:

Power amplifier module (front-end) damages

Amplifier tube (rear-end) damages

The above problems are caused by low gain and decreased output power. If the power amplifier causes the fault, replace the module.

1. Remove the connections between the through-line power meter, large power load, and the amplifier output end.

2. Restore the connection between the amplifier output end and the AEM.

Normal Result

Troubleshooting

Exit from Test



Measuring VSWR

Site Master

50 SMA (M) matching load

SMA torque spanner

One N(M), -N(M) testing cable

1. Turn on the power switch of Site Master.

2. Select OPT in the main menu.

3. Select the items to be measured (SWR, RL, and CL) by pressing the B1 key.

4. Select the FREQ key in the main menu, and enter start and stop scanning frequencies.

5. Select the START CAL key to calibrate the measuring instrument as follows:

i. Connect the circuit breaker (OPEN) with TEST PORT and select ENTER.

ii. Connect the shorter (SHORT) with TEST PORT and select ENTER.

iii. Connect the 50 load with TEST PORT and select ENTER.

The system performs auto calibration.

6. In SCALE of the main menu, enter the values of TOP, BOTTOM, and LIMIT. For convenient query, the recommended value of TOP is 1.5 and BOTTOM is 1.0.

7. In the FREQ menu, select MARKER and then select EDIT. Read the values. Examine if these values meet the requirements and then save them.

VSWR is less than 1.5.

If the test result is not normal, use the fault location function (DTF) to find the position of the fault and its cause. Remove the fault as appropriate.

Reconnect the connector of the equipment and restore the system.

Calibrate the measuring instrument before power-on for measurement

If measurement is conducted during equipment running, it is necessary to notify the customer or get the customer's approval. Lock the relevant sectors then switch off the relevant power and perform the test.

Tools

Test Procedure

Normal Result

Troubleshooting

Exit from Test

Precautions



Note: Measurement during equipment running is not recommended.

During measurement, observe the running status of the equipment with care.

Clock Calibration (Optional for the BTS with Internal Synchronization)

Frequency meter

Notebook computer installed with LMT software

1. Set the BTS to the internal synchronization mode in OMCR.

Select Configuration Management > Integrated Configuration Management > PhyView. Right-click Physical Site, select Site Attribute from the popup menu and set the synchronization mode after entering the Attribute interface.

2. Connect the frequency meter to the 13 MHz clock test port at the cabinet top. The 13 MHz clock-testing interface is located at the top of the Power Distribution Module (PDM) panel.

3. Connect the serial port on the notebook computer to the External Test Port (ETP) of the CMB.

4. Start LMT in the computer and click (the CLK Calibrate icon) in the menu to enter the CKU calibration interface, as in Figure 2.

Tools

Test Procedure



F I G U R E 2 CKU C AL I B R AT I O N I N T E R F AC E

5. Press Start to start communication with the BSC. When the program starts, only the Start button is available and all other buttons are unavailable. Buttons such as Calibrate becomes unavailable.

6. The current CKU values shown in the CKU calibration interface include DAC value and voltage. Calibrate the DAC value in the calibration group box. Enter a DAC value manually or use the arrows to adjust the DAC value. The Step value determines the length of each increase or decrease in the DAC value. Three options are available: 1, 3 and 10. After specifying the DAC value, the system calculates the corresponding voltage automatically. Press the Adjust button to notify the BSC calibration. Observe the frequency meter until the clock adjusts to 13 MHz.

7. Press Save to save the DAC value in the Flash memory, and the system adopts the value saved in Flash memory at the reboot. Save the new DAC value before rebooting the system otherwise the system uses the old DAC value saved earlier in Flash memory.

8. Press End to terminate the calibration.

The clock calibrates to 13.000000 MHz 0.025 ppm.

If the clock calibration is not possible to be in the above given range, then replace CMB.

Normal Result

Troubleshooting



Reset the BTS to its original mode if previously it works in the external synchronization mode.

Cleaning Air Filters of the Cabinet

B8018 cabinet has two air filters: One is installed in the air filter plug-in box at the bottom of the cabinet and the other is at the front door.

None

1. Replace the air filter at the bottom of the cabinet in the following way:

i. Open the cabinet door, and loosen the two screws at both sides of the air filter plug-in box and hold the two handles to pull out the air filter plug-in box.

ii. Loosen the screws to take off the mechanical parts on the air filter, and then remove the air filter.

iii. Wash the air filter with clean water and air. Dry it or replace it with a new air filter.

iv. Install the air filter into the air filter plug-in box again. Make sure that the air filter is flat.

v. Push the air filter plug-in box along the guide rail into the cabinet, until the rear side of the panel presses closely against the front side of the guide rail. Fasten two screws and close the cabinet door.

vi. Connect the protection ground of the cabinet to the earth properly.

Caution: In dismounting the air filter plug-in box, protect the RF cables above it.

2. Replace the air filter on the cabinet door in the following way:

i. Open the cabinet door and take off the springs pressing the air filter. Take care of the hooks at both sides of the pressing strips and do not pull the springs by force.

ii. Take off the fastening screws on the upper and lower pressing strips to remove the upper and lower pressing strips and the air filter.

iii. Wash the air filter with clean water and air dry it or replace it with a new air filter.

3. Install the dust screen into the cabinet door again and make sure that the dust screen is installed flatly. Close the cabinet door.

Exit from Test

Tools

Test Procedure



Checking Lightning Arresters

Site Master

50 N(F) matching load

One testing cable

Adapters N(M)-7/16DIN(M), N(M)-7/16DIN(F) The following steps describe how to check lightning arresters:

1. Switch off the power of all DTRMs of the corresponding carrier shelf on the PDM front panel.

2. Loose the jumper connectors connected to both ends of the lightning arrester.

3. Calibrate the Site Master.

i. Press the START CAL button to perform zero calibration prior to the test.

ii. Connect the short calibration terminal (OPEN) to RF/REFLECTION on the backplane, and press ENTER.

iii. Connect the open-circuit calibration terminal (OPEN) to RF/OUT, and press ENTER to calibrate the load.

iv. Select SAVE SETUP to save the calibration value (optional).

4. Connect the Site Master to a port on the lightning arrester via testing cable.

5. Connect the other port on the lightning arrester to the matching load.

6. Read the Site Master and examine whether the return loss of the lightning arrester is within the valid range.

7. Repeat Steps (4) through (6) to measure the return loss of the other port on the lightning arrester.

8. Adjust the multi-meter to X10K to measure the resistance of the conductor in the high-frequency sockets at both ends of the lightning arrester.

9. Adjust the multi-meter to X1 to measure the resistance between the conductor in the antenna and the ground.

The technical indices of the lightning arrester comply with the product specifications. The measured value is more than 20 dB.

The resistance of the conductor in the high-frequency sockets at both ends of the lightning arrester is more than 20 M.

The resistance between the conductor in the antenna and the ground is approximately 0 .

If the measured value is beyond the valid range, replace the lightning arresters.

Tools

Test Procedure

Normal Result

Troubleshooting



Connect the jumper connectors to the two ports on the lightning arrester. Power-on the DTRMs of the carrier shelf on the PDM panel to recover the system.

Take care of the grounding connection of the lightning arrester, so that they may not be damaged.

Checking Grounding Cables

None

Check if connectors of the grounding cables are loose, rusty or aged.

The connectors are not loose, rusty or aged.

Replace the grounding cables and reconnect them.

Measuring the Grounding Resistance

Earth resistance tester (model ZC-8)

1. Disconnect the grounding down-lead from the equipment, and connect it to the earth resistance tester.

2. Mount two auxiliary piles 20 m and 40 m away from the testing point (remote voltage/remote current). To ensure good contact between the piles and the earth, sprinkle water around them.

3. Connect the two auxiliary piles and terminals of the earth resistance tester with a conducting wire. Shake the handle of the tester to measure the grounding resistance. For the battery power supply, Grounding resistance can be read directly by pressing the button.

Grounding resistance 5

Note: Measure the grounding resistance according to the design requirements, if any.

Check for the reliable connection of the grounding down-lead to the ground grid.

Check if the ground grid system complies with the design, and if any resistance-reducing agent is applied on regular basis.

Exit from Test

Precautions

Tools

Test Procedure

Normal Result

Troubleshooting

Tools

Test Procedure

Normal Result

Troubleshooting



Checking Antenna Feeder Interface

Site Master

Observe the LEDs on the AEM panel and check for SWR1 and SWR2 alarms.

Check if the RF cables of the antenna feeder system are aged.

The LEDs on the AEM panel show no SWR alarms.

The RF cables of the antenna feeder system are not aged.

According to the VSWR measuring method, check the VSWR of the jumpers, main feeders and antennas. Check segment by segment from the output port of the combiner to locate the defective parts. Replace the defective parts until the fault is removed.

If the RF cables are aged, replace them.

Checking the Firmness of Antennas and Tower

Spanner

Check for the proper setting of fixing clips of antennas and antenna supports.

Check for the proper setting of fixing clips of the tower top amplifiers.

The fixing clips of antennas and tower top amplifiers are reliable and do not shake or slide.

Tighten the fastening screws with a spanner.

Checking the Tilt of Directional Antennas

Angle gauge

Check the tilt of a directional antenna by using the rotary angle gauge with a bubble tube as shown in Figure 3. If using other instrument, refer to the corresponding instruments instructions.

Tools

Test Procedure

Normal Result

Troubleshooting

Tools

Test Procedure

Normal Result

Troubleshooting

Tools

Test Procedure



F I G U R E 3 AN G L E G AU G E

0

1020

30

40

5060

7080

90

80

7060

50

5060

7080

90

8070

60

50

40

3020

10

43210

576

8

87

65

43

21

01

23

45

67

887

65

43

21

215

12

1

152

12

1

DIAL

1. Press the angle gauge against the object to be measured, as shown in Figure 4.

F I G U R E 4 ME AS U R I N G T H E OB J E C T W I T H AN AN G L E G AU G E ( I )

1 2 30123

80

80

78

60

4

6

5

70

50

8

6050

70

567 234

12 156080

90

4

70

875 61

4050

30

10

20

2010

30

2

015

5

60

8090

70

101

432

8

4050

121

76 D

IAL

2



2. Rotate the dial until the bubble in the air bleeder is located in the middle of two indication rings.

3. Read the scale on the dial.

The tilt conforms to the network planning requirements.

1. Rotate the dial to set the angle.

2. Press the object to be measured against the dial chassis firmly. Move the object and chassis together until the bubble in the air bleeder moves to the middle of the two indication rings, as shown in Figure 5.

F I G U R E 5 OB J E C T M E AS U R E M E N T W I T H T H E AN G L E G AU G E ( I I )

3

60

7

50

8

6

54

1250

1

278 356 4

507060 80

34

0121

60

7080

90

8

6

5

7 DIAL

0

3070

1030

4020

20

10

72

2

8090

011

7080 60

43 65

12 15

4050

81

2

215

Normal Result

Troubleshooting



Checking Waterproof Status of Feeder Connectors and Lightning Protection Grounding Clips

Waterproof adhesive

Sealant

Insulation tape

Check for the water leakage and cracks on the antenna feeder connectors and the lightening protection grounding kit.

No leakages or cracks found.

Follow the steps below to make waterproof treatment:

1. Switch off the power of all DTRMs/EDTRMs of the corresponding carrier shelf on the PDM panel.

2. Remove the existing waterproof material.

3. Wrap the waterproof adhesive at the connector, apply the seal adhesive, and then wrap the insulation tape.

4. Wrap the adhesive tape layer by layer from the bottom to avoid rainwater leakage.

5. Power-on the DTRMs of the corresponding carrier shelf on the PDM panel.

Checking Iron Towers (Optional)

None

Check the tower lamps.

Check the tower structure and the base by measuring the verticality and height of the iron tower.

Check the stronghold of structure bolts.

Check the corrosion-proof and rust-proof conditions.

The structure distortion, base sinking and verticality of the iron tower all satisfy the design requirements. The bolts are fixed tightly and there is no corrosion or rust on them.

Handle the abnormalities as per procedure.

Checking the Mast (Optional)

None

Check the following:

Tools

Test Procedure

Normal Test

Troubleshooting

Tools

Test Procedure

Normal Result

Troubleshooting

Tools

Test Procedure



Installation of the mast fasteners

Stresses of the mast

Cables on the cabling wire tower and anchors

Corrosion-proof and rust-proof conditions

Mast verticality

The mast is firmly fixed and there is no corrosion or rust. The mast is vertical.

Resolve the exceptions as per procedure.

Checking Running Status of Transmission Equipment

None

Observe whether LEDs on the transmission equipment indicate any alarm.

No alarm is present.

Refer to Users Manual of the transmission equipment.

Checking Running Status of Storage Batteries

Multi-meter

Check for battery leakage and reliable contact of the connection lines. Check the output voltage and current by multi-meter.

There is no battery leakage and the connection is normal.

Refer to the battery instructions.

Normal Result

Troubleshooting

Tools

Test Procedure

Normal Result

Troubleshooting

Tools

Test Procedure

Normal Result

Troubleshooting


C h a p t e r 7

Routine Maintenance Record Forms


Daily maintenance record form

Weekly maintenance record form

Monthly maintenance record form

Quarterly maintenance record form

Annual maintenance record form

Emergency troubleshooting record form

Board replacement data record form

Daily Maintenance Record Form T AB L E 9 D AI L Y M AI N T E N A N C E R E C O R D FO R M

Daily Maintenance Record Form

On-duty Date:

On-duty Time:

Person Handing Over the Shift:

Relief Person:

Current Alarm Records of the BTS

Site No. Alarm Description

Time of Occurrence

End Time Remarks



Daily Maintenance Record Form

History Alarm Records of the BTS

Site No. Alarm Description and Troubleshooting Remarks

History Notification Message Records of the BTS

Site No. Notification Message Description and Troubleshooting

Remarks

Real time Status Abnormality Records of Cells

Site No. Abnormalities and Troubleshooting Remarks

Customer Complaints

Site No. Complaint Description and Troubleshooting

Remarks

Shift Description:

Shift Leader:

Verification:

Chapter 7 - Routine Maintenance Record Forms


Weekly Maintenance Record Form T AB L E 10 WE E K L Y M AI N T E N AN C E R E C O R D FO R M

Weekly Maintenance Record Form

Maintenance Time: Maintenance Staff:

Check Item Analysis and Conclusion

Exception Handling Remarks

History alarms

History notification messages

Alarm frequency

Performance data

Shift Leader:

Verification:



Monthly Maintenance Record Form T AB L E 11 MO N T H L Y M AI N T E N AN C E R E C O R D FO R M


Spare parts The spare parts are complete and in good condition

Yes No

Check Item Record of the Worst Cell Troubleshooting the Worst Cell

Remarks

Data analysis of the monthly cell performance report

Shift Leader: Verification:



Quarterly Maintenance Record Form T AB L E 12 QU AR T E R L Y M AI N T E N AN C E R E C O R D FO R M

Quarterly Maintenance Record Form


Category Check Item Check Result Remarks

The coverage test result is normal

Yes No

The conversation test result is normal

Yes No

Conversation, coverage and handover tests

The handover test result is normal

Yes No

The burglar nets, doors and windows are intact

Yes No

Equipment room temperature

Temperature:

Equipment room humidity

Humidity:

The air conditioners in the equipment room are running normally

Yes No

The equipment room is clean

Yes No

The equipment room lighting is normal

Yes No

The sockets in the equipment room are normal

Yes No

The safety facilities in the equipment room are complete

Yes No

Equipment room maintenance

The environment alarm collection devices are normal

Yes No

The power supply of cabinets is normal

Yes No

The fans run normally Yes No

Checking the principal equipment

The boards run normally

Yes No

Shift Leader:

Verification:



Annual Maintenance Record Form T AB L E 13 AN N U AL M AI N T E N AN C E R E C O R D FO R M

Yearly Maintenance Record Form

Maintenance Time:

Maintenance Staff:

Category Check Item Check Result Remarks

Measuring the output power of amplifiers

Output power:

Measuring the VSWR VSWR:

The clock calibration is completed

Yes No

Checking the principal equipment

The air filters of each cabinet are clean

Yes No

The lightning arresters are normal

Yes No

The grounding cables are reliably connected

Yes No

Checking the grounding and lightning protection status

Measuring the grounding resistance

Grounding resistance:

The antenna feeder interfaces are normal

Yes No

The TTAs are fixed firmly

Yes No

The tilt of the directional antennas satisfies the requirements

Yes No

Checking the antenna feeder system

The antenna feeder interfaces and the lightning protection grounding clips are normal

Yes No

The iron towers are normal

Yes No

The masts are normal Yes No

The transmission equipment runs normally

Yes No

Checking others

The storage batteries are normal

Yes No

Shift Leader:

Verification:



Emergency Troubleshooting Record Form T AB L E 14 EM E R G E N C Y TR O U B L E S H O O T I N G R E C O R D FO R M

Emergency Troubleshooting Record Form

Site Name: Handled by:

Time of Occurrence: Solved Time:

Fault Source: Subscriber complaints Alarm system

___ Detected in daily maintenance Others

Fault Type:

Fault Symptom:

Troubleshooting:

Result:

Leaders comments:



Board Replacement Data Record Form T AB L E 15 BO AR D R E P L AC E M E N T D AT A R E C O R D FO R M

Board Replacement Data Record Form

BTS No.: Maintenance Staff:

Board Type

Board Slot

Time of Fault

Replacement Time

SN of the Faulty Board

SN of the Replacing Board


A p p e n d i x A

Board Replacement

Board Replacement Overview

The replacement of defective modules and parts is a common and very important method used during routine maintenance. During module replacement, it is recommended to contact the relevant technicians or ZTE local maintenance staff for technical support and guidance.

The following principles should be considered necessary during the replacement of modules and parts:

Store undamaged spare parts in antistatic bags (moisture-proof bags are recommended). Sort the spare parts in cartons and label the cartons for easy identification.

Wear an antistatic wrist strap while plugging and unplugging any module. Connect the antistatic wrist strap to the grounding terminal of the rack. Do not touch the grounding terminal after the connection.

Note: There is 1 M resistor connected in series between the antistatic wrist strap and the grounding terminal, and any touch with the grounding terminal may bypass this resistor.

While holding a module, do not touch the circuits, components or wiring slots on the module. Do not plug/unplug the module with extra force. The right steps are as follows:

i. Hold the handles of the panel and slightly uplift the module.

ii. Align the module with the backplane and then insert the module slightly to avoid bending the pins or slots on the backplane or module.

iii. Tighten the fixing screws on the module after inserting the module.



Use a torque spanner to plug/unplug the RF cable on the front panel of the rack. Do not use force to avoid destroying the RF cable connector.

While installing the feeder jumper, insert the connector of the feeder jumper into the socket of the AEM and tighten the connector by hand.

Indicate the cause of the fault in the modules and keep the defective modules in antistatic bags. Sort the modules and store them as suitable.

Install a standard dummy panel in the empty slot to protect against dust.

Make sure that the module is properly inserted in the slot.

Avoid hot plugging/unplugging during module replacement.

Ground the test instrument while using.

CMB Replacement

Antistatic wrist strap

Phillips screwdriver

1. Determine the necessity to replace the module through fault observation and analysis.

2. Prepare a new module of the same model as of the defective module.

3. Prepare an antistatic bag, a moisture-proof bag, a carton and labels for identification.

1. Turn off the power switch of CMB, which is on the PDM front panel, as shown in Figure 6. CMB1 controls the power supply of the upper CMB while CMB2 controls the power supply of the lower CMB.

Tools

Preliminary Setup

Procedure

Appendix A - Board Replacement


F I G U R E 6 LO C AT I O N O F CMB P O W E R SW I T C H E S O N PDM P AN E L

2. Wear an antistatic wrist strap.

3. Perform the active/standby changeover before replacing the active CMB to make the standby module become active.

4. Loosen the fixing screws on the CMB panel and pull the handles on the defective module outwards with one hand. When the module leaves the slot and springs outwards, hold the lower edge of the module with the other hand, and then pull out the module slightly. During this operation, avoid touching the components and circuits on the module.

5. Keep the defective board in an antistatic bag, containing a moisture-proof bag. Label it indicating the module model, defective slot number, program version, and fault. Store the defective module properly in a carton. Label the carton for easy identification in the future.

6. According to the slot specified on the plug-in box, insert the spare CMB into the plug-in box. Push the module with proper force until it is in the proper location and then tighten the fixing screws.

7. Power-on the CMB again.

1. Self-test process starts on powering-on the CMB. Upon successful self-test, LEDs show normal state and the module recovers services, indicating the successful replacement.

Confirmation



2. If the module fails the self-test, it performs the self-test again and then shows the abnormity of the relevant unit with the services not recovered, indicating replacement failure.

3. Analyze the fault through the foreground and background to make sure that the fault is caused by the module.

DTRU/EDTRU Replacement






4. Record the locations of RF cables on the front panel of the defective module, so as for easy restore of the cables after module replacement.

1. Turn off the power switch of DTRM/EDTRM, which is on the PDM front panel, as shown in Figure 7.

F I G U R E 7 LO C AT I O N O F DTRU/EDTRU P O W E R S W I T C H E S O N PDM P AN E L

PDM

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON ON

OFF OFF

ON

OFF

ON

OFF

SLOT1-1 SLOT1-2 SLOT1-3 SLOT2-1 SLOT2-2 SLOT2-3

EIBCMB2CMB1SLOT3-3SLOT3-2SLOT3-1ON/OFF


3. Unplug the RF cables on the DTRU/EDTRU front panel.

4. Loosen the fixing screws on the DTRU/EDTRU panel and pull the handles on the defective module outwards with one hand. When the module leaves the slot and springs outwards, hold the lower edge of the module with the other hand, and then

Tools

Preliminary Setup

Procedure

Appendix A - Board Replacement


pull out the module slightly. During this operation, avoid touching the components and circuits on the module.

5. Keep the defective board in an antistatic bag, containing a moisture-proof bag. Label it indicating the module model, defective slot number, program version and fault. Store the defective module properly in a carton. Label the carton for easy identification in the future.

6. According to the slot specified on the plug-in box, insert the spare DTRU/EDTRU into the plug-in box. Push the module with proper force until it is in the proper location and then tighten the fixing screws.

7. Power-on the DTRU/EDTRU again.

1. Self-test process starts on powering-on the DTRU/EDTRU Upon successful self-test, LEDs show normal state, and the module recovers services, indicating the successful replacement.

2. If the module fails the self-test, it performs the self-test again and then shows the abnormity of the relevant unit with the services not recovered, indicating replacement failure.

3. Analyze the fault through the foreground and background to make sure that the fault is caused by the module.

AEM Replacement






4. Record the locations of RF cables (such as RF cables and feeder jumpers) on the front panel of the defective module, so as for easy restore of the cables after module replacement.

1. Turn off the power supply of AEM. The AEM is powered through the TRM/ETRM. Therefore, all the DTRUs/EDTRUs should be turned off from PDM panel.


3. Unplug the RF cables (such as RF cables and feeder jumpers) from the front panel.

4. Loosen the fixing screws on the AEM panel and pull the handles on the defective module outwards with one hand. When the module leaves the slot and springs outwards, hold

Confirmation

Tools

Preliminary Setup

Procedure



the lower edge of the module with the other hand, and then pull out the module slightly. During this operation, avoid touching the components and circuits on the module.

5. Keep the defective board in an antistatic bag, containing a moisture-proof bag. Label it indicating the module model, defective slot number, program version and fault. Store the defective module properly in a carton. Label the carton for easy identification in the future.

6. According to the slot specified on the plug-in box, insert the spare AEM into the plug-in box. Push the module with proper force until it is in the proper location and then tighten the fixing screws.

7. Power-on the AEM again.

Self-test process starts on powering-on the AEM. Upon successful self-test, LEDs show normal state, and the module recovers services, indicating the successful replacement.

If the module fails the self-test, it performs the self-test again and then shows the abnormity of the relevant unit with the services not recovered, indicating replacement failure.

Analyze the fault through the foreground and background to make sure that the fault is caused by the module.

EIB/FIB Replacement






EIB Replacement

1. Turn off the power switch of EIB.


3. Loosen the fixing screws on the EIB panel and pull the handles on the defective module outwards with one hand. When the module leaves the slot and springs outwards, hold the lower edge of the module with the other hand, and then pull out the module slightly. During this operation, avoid touching the components and circuits on the module.

4. Keep the defective board in an antistatic bag, containing a moisture-proof bag. Label it indicating the module model, defective slot number, program version and fault. Store the

Confirmation

Tools

ZXG10 B8018 (V1[1].00) Maintenance Manual (Routine Maintenance)

Documents

Transcript of ZXG10 B8018 (V1[1].00) Maintenance Manual (Routine Maintenance)