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ZXG10-BTS (V1A)

Base Transceiver Station

Maintenance Manual

ZTE Corporation

© ZTE Corporation. 2002, Shenzhen, P. R. China

All rights reserved. No part of this publication may be excerpted, reproduced, translated, annotated or edited, in any form or by any means, without the prior written permission of the copyright owner.

ZXG10-BTS (V1A)

Maintenance Manual

* * * *

3/F., A Wing, ZTE Plaza, Hi-Tech Industrial Park, Shenzhen, P. R. China

Tel: (0086) 755–26790192

Fax: (0086) 755–26790160

Post-code: 518057

* * * *

August, 2002 First Edition, First Print

Preface

ZXG10, a GSM mobile communication system independently developed by ZTE Corporation, is

composed of the switching sub-system ZXG10-MSS and the base station sub-system ZXG10-BSS.

The ZXG10-BSS is in charge of providing and managing wireless transmission in GSM, and is

composed of the base station controller ZXG10-BSC and the base station transceiver ZXG10-BTS,

etc. The reliable running of the ZXG10-BSS on the network is closely related to correct operation

and maintenance. Therefore, it is very important to handle problems properly with correct methods.

The ZXG10-BTS (V1A) Maintenance Manual serves as a guide for the user to perform daily

maintenance and fault handling on ZXG10-BTS (V1A). This manual primarily introduces the daily

maintenance, alarm handling and operation information processing of ZXG10-BTS (V1A).

In this Manual, ZXG10-BTS (V1A) is abbreviated as BTS (V1A) or BTS; ZXG10-BTS (V1A) local

management terminal as LMT; ZXG10-BSS (V1A) as BSS; and ZXG10-BSC (V1A) as BSC (V1A)

or BSC.

This Manual includes three chapters: Chapter 1 introduces the routine maintenance and emergent

maintenance of the ZXG10-BTS (V1A) as well as frequently used maintenance methods. Chapter 2

introduces the alarm classification of the LMT of ZXG10-BTS (V1A) and describes in detail the

alarm code, alarm content, alarm level, alarm cause, alarm impact, time limit of handling, and

handling process. Chapter 3 itemizes the operation information and handling methods of the boards

such as OMU and TRU. Appendix A introduces the procedures and precautions for replacing parts

and boards. Appendix B gives a list of abbreviations used in this document for the convenience of

users in reading this Manual.

This set of manuals also consists of the following documents:

Technical Manual for ZXG10-BTS (V1A)

Installation Manual for ZXG10-BTS (V1A)

Operation Manual for ZXG10-BTS (V1A)

Statement: The actual product may differ from what is described in this manual due to

frequent updates of ZTE products and fast development of technologies. Please contact our

local office for updating/upgrading information of the product.

Contents

1 EQUIPMENT MAINTENANCE .......................................................................................................... 1

1.1 MAINTENANCE DESCRIPTION ....................................................................................................................... 1

1.2 ROUTINE MAINTENANCE ............................................................................................................................. 2

1.2.1 Daily routine maintenance ........................................................................................................... 2

1.2.2 Regular routine maintenance ....................................................................................................... 4

1.3 EMERGENT MAINTENANCE .......................................................................................................................... 5

1.4 TYPICAL MAINTENANCE METHODS ............................................................................................................... 6

1.5 RELEVANT MAINTENANCE TABLES ................................................................................................................ 7

1.5.1 Routine maintenance and operation record table ....................................................................... 7

1.5.2 Emergent maintenance and operation record table .................................................................. 10

2 ALARM HANDLING ........................................................................................................................... 11

2.1 ALARM INFORMATION AND CLASSIFICATION ................................................................................................. 11

2.2 LEVEL-1 ALARM .................................................................................................................................... 18

2.3 LEVEL- 2 ALARM ................................................................................................................................... 18

2.3.1 Alarm of the main clock signal of the BS CKU ......................................................................... 18

2.3.2 Software version error of the BIE .............................................................................................. 19

2.3.3 Major alarm of the standing wave ratio of the transmitter combiner ....................................... 19

2.3.4 Communication interruption of the OMU .................................................................................. 20

2.4 LEVEL- 3 ALARM ................................................................................................................................... 21

2.4.1 Check error of the uplink data from the receiving processor to the channel processor ............ 21

2.4.2 Frame unit fault .......................................................................................................................... 24

2.4.3 Inconsistency of software versions ............................................................................................. 27

2.4.4 Out-of-lock of the transmitting RF self oscillator ...................................................................... 28

2.4.5 Error of software versions .......................................................................................................... 29

2.4.6 Fault of the BS clock unit (CKU) ............................................................................................... 31

2.4.7 Fault of BIE switching chips ...................................................................................................... 33

2.4.8 Faults of the BIE E1 interface .................................................................................................... 35

2.4.9 Alarm of fans of the BIE ............................................................................................................. 41

2.4.10 Alarm of temperature sensor ................................................................................................... 47

2.4.11 Fault of buses ........................................................................................................................... 52

2.4.12 Alarm of power amplifiers (PAs) .............................................................................................. 53

2.4.13 Alarm of low-noise amplifiers of the receiver multi-coupler .................................................. 55

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2.4.14 Power alarm ............................................................................................................................. 57

2.4.15 Interruption of board communications .................................................................................... 58

2.4.16 Timeout of board unreported .................................................................................................... 61

2.4.17 Alarm of the 80W power amplifier (PA) ................................................................................... 62

2.4.18 Other alarm information .......................................................................................................... 63

2.5 LEVEL 4 ALARM ..................................................................................................................................... 67

2.5.1 Digital processor fault in the transceiver .................................................................................. 67

2.5.2 Check error of the uplink data from the RPP to the CHP .......................................................... 72

2.5.3 Cross-threshold of the flash memory programming times in the frame unit controller ............. 75

2.5.4 Channel parameter configuration error .................................................................................... 75

2.5.5 Out-of-lock of receiving RF self oscillator ................................................................................. 79

2.5.6 Alarm for out-of-lock of the phase-locked loop of the BS CKU ................................................. 80

2.5.7 No response of layer-3 software ................................................................................................. 81

2.5.8 Slide code indication of the BIE E1 interface signal ................................................................. 83

2.5.9 BS OMU fault ............................................................................................................................. 88

2.5.10 Minor alarm of PA over-temperature ....................................................................................... 89

2.5.11 Board communication interruption .......................................................................................... 90

2.5.12 Boards are unreported till timeout .......................................................................................... 94

2.5.13 80W PA link alarm .................................................................................................................. 101

3 RUNNING INFORMATION PROCESSING .................................................................................. 102

3.1 CLASSIFICATION OF RUNNING INFORMATION ............................................................................................... 102

3.2 OMU OPERATION INFORMATION ............................................................................................................. 106

3.2.1 OMU board not powered on ..................................................................................................... 106

3.2.2 OMU board powered on ........................................................................................................... 106

3.2.3 OMU BOOT starting ................................................................................................................ 106

3.2.4 OMU in active status ................................................................................................................ 107

3.2.5 OMU in standby status ............................................................................................................. 107

3.2.6 OMU procedure initially launched .......................................................................................... 107

3.2.7 OMU clock fault ....................................................................................................................... 108

3.2.8 OMU LAPD link disconnected. ................................................................................................ 108

3.2.9 OMU system in the initialization status .................................................................................. 108

3.2.10 OMU file downloading ........................................................................................................... 109

3.3 TRU OPERATION INFORMATION ............................................................................................................... 109

3.3.1 TRU board not powered on ...................................................................................................... 109

3.3.2 TRU board powered on ............................................................................................................ 109

3.3.3 BOOT starting .......................................................................................................................... 110

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3.3.4 Process initially started ............................................................................................................ 110

3.3.5 OMU clock fault ....................................................................................................................... 110

3.3.6 LAPD link disconnected ........................................................................................................... 111

3.3.7 TRU HDLC link disconnected .................................................................................................. 111

3.3.8 TRU system in the initialization status ..................................................................................... 112

3.3.9 TRU file downloading ............................................................................................................... 112

3.3.10 TRU BCCH carrier indication ............................................................................................... 112

3.4 BIE RUNNING INFORMATION ................................................................................................................... 113

3.4.1 BIE board not powered on ........................................................................................................ 113

3.4.2 BIE program out of service ...................................................................................................... 113

3.4.3 BIE HDLC link not established ................................................................................................ 113

3.4.4 BIE working normally .............................................................................................................. 114

3.4.5 BIE in the active status ............................................................................................................. 114

3.5 EBIE RUNNING INFORMATION ................................................................................................................ 114

3.5.1 EBIE board not powered on ..................................................................................................... 114

3.5.2 EBIE program out of service .................................................................................................... 115

3.5.3 EBIE 8K and E1 alarm ............................................................................................................. 115

3.5.4 EBIE HDLC link not established .............................................................................................. 115

3.5.5 EBIE working normally ............................................................................................................ 116

3.5.6 EBIE in active status ................................................................................................................ 116

3.5.7 EBIE parameter configuration ................................................................................................ 116

3.6 CKU RUNNING INFORMATION ................................................................................................................. 117

3.6.1 CKU board not powered on ...................................................................................................... 117

3.6.2 CKU initialization .................................................................................................................... 117

3.6.3 CKU program out of service .................................................................................................... 117

3.6.4 CKU working normally ............................................................................................................ 118

3.6.5 CKU in the active status ........................................................................................................... 118

3.6.6 CKU in the phase lock status .................................................................................................... 118

3.6.7 CKU in the locked status .......................................................................................................... 118

3.6.8 Asynchronization of the whole CKU network .......................................................................... 119

3.6.9 The CKU clock frame number abnormal ................................................................................. 119

3.6.10 CKU HDLC link not established ............................................................................................ 119

3.6.11 The CKU 8K clock abnormal ................................................................................................. 120

3.7 EAM RUNNING INFORMATION ................................................................................................................ 120

3.7.1 EAM board not powered on ..................................................................................................... 120

3.7.2 EAM initialization .................................................................................................................... 120

3.7.3 EAM working normally ............................................................................................................ 121

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3.7.4 EAM HDLC link disconnected ................................................................................................. 121

3.7.5 The EAM system clock severely abnormal ............................................................................... 121

APPENDIX A REPLACEMENT OF BOARDS AND PARTS .......................................................... 123

A.1 OVERVIEW ........................................................................................................................................ 123

A.2 REPLACEMENT OF THE PUBLIC SHELF BOARD .......................................................................................... 124

A.3 REPLACEMENT OF THE CARRIER SHELF BOARD ........................................................................................ 125

APPENDIX B ABBREVIATIONS ....................................................................................................... 127

iv

1 Equipment Maintenance

1.1Maintenance description

The objective of daily maintenance is to ensure an optimized working condition of the product, so

that the whole network runs properly. The classification of the daily maintenance of the ZXG10-BTS

(V1A), together with the maintenance requirements and recommendations will be described below.

1. Maintenance classification

Daily maintenance of ZXG10-BTS (V1A) can be classified into routine maintenance and emergent

maintenance.

The routine maintenance refers to periodical maintenance, which is divided into daily routine

maintenance and regular routine maintenance by their maintenance periods. Emergent maintenance

refers to the maintenance tasks to be immediately executed as required by sudden failures of the

ZXG10-BTS (V1A) equipment and network adjustment, e.g., equipment failure, user-reported fault,

and the emergent problems found out in routine maintenance. Emergent failures are characterized by

abrupt occurrence and serious influences on the QoS, so the maintenance personnel in the equipment

room are required to handle them decisively, cautiously and in-time. A detailed record must be made

afterward so as to eliminate potential faults.

2. Maintenance requirements and recommendations

The daily maintenance of ZXG10-BTS (V1A) equipment is a major task for the maintenance

personnel in the equipment room. Excellent daily maintenance is a key factor to ensure long-term

stable running of the equipment. Therefore, a set of equipment room maintenance regulations should

be formulated to regulate and guide the work of the maintenance personnel. The followings are some

basic requirements and recommendations for daily maintenance:

1) The maintenance personnel should implement the daily and regular routine check strictly and

keep a detailed record without any omission.

2) The maintenance personnel must keep the equipment room safe and tidy, with proper

temperature and humidity.

3) The maintenance personnel should follow the equipment operation specifications strictly,

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avoid any operations on the equipment beyond the daily maintenance specifications, e.g.,

arbitrarily plugging/unplugging, resetting, starting and switching over the equipment, or

changing the data; and should wear an anti-static wrist strap when accessing the hardware

system, and store the damaged parts and the spare parts in anti-static bags, which should be

labeled of the category and stored properly.

4) The person in charge of the equipment room should keep the user accounts, passwords and

the user authorities for login to the local operation & maintenance console and to the network

management system, and distribute them to relevant persons according to their specific

authorities, so as to define the responsibility and authority clearly.

5) The maintenance personnel should handle detected problems and faults in time, report major

problems to relevant supervisors in time and contact the local office of ZTE to get an early

solution, which should be recorded in detail afterward.

6) Before on-duty, the maintenance personnel must undergo necessary training. Different

maintenance positions should be assumed by persons of the corresponding technical levels.

7) The frequently used tools and instruments should be checked, repaired and calibrated before

use to ensure their proper conditions. Generally, the following tools and instruments are

recommended to be prepared in the equipment room.

A. Tools and auxiliary materials: screwdriver (flat-head and Phillips), diagonal pliers, cable

stripper, unpacking pliers, electric iron, chip-extractor, programmer, eraser, tweezers,

spanner, electrical drill, tape, anti-static wrist strap, insulating tape and cable tie.

B. Instruments: Multimeter, thermometer, humidity meter, optical power meter and earth

resistance tester.

8) The power supply of the system should be kept stable and reliable, and the grounding of the

system should be checked regularly.

1.2Routine maintenance

1.2.1Daily routine maintenance

Daily routine maintenance includes the following items:

1. Equipment room environment

1) Temperature requirements:

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Maintenance Manual for ZXG10-BTS (V1A)

Ambient temperature requirements: -5˚C ~ +45˚C; recommended to be always kept between

15˚C ~ 30˚C. A thermometer should be available in the equipment room, and the maintenance

personnel should check it daily and make a record in detail; an air conditioner is recommended

to be installed in the equipment room to meet the temperature requirements for long-term stable

running of the equipment.

2) Humidity requirement

Relative humidity requirement: 15%~85%; recommended to be kept at 40%~65%. A humidity

meter should be available in the equipment room, and the maintenance personnel should check

it daily and keep a record in detail. A humidity conditioning device is recommended to be

installed in the areas where the humidity is seriously improper, especially, a damp-proof device

is recommended in areas of high humidity and anti-static floor is recommended in areas of low

humidity.

3) Working status of the air conditioner

Check whether the air conditioner (or other humidity conditioning devices) can work normally

according to the preset temperature (humidity) requirements, and handle the faults in time if

any.

4) Dust-proof

During the daily maintenance, the equipment should be kept free from dust or contamination. It

is recommended to apply dust-proof sealing rubber strips around the windows and doors of the

equipment room, adopt double-layered-glass sealed windows and wear union suits and special

shoes in the equipment room to diminish dust. In addition, strong magnetic, electrical or

corrosive materials should not be present inside or around the equipment room so as to prevent

from harmful particles.

2. Equipment running status

1) Querying the alarm information

Check the site alarms and rack alarms in the alarm query window of the operation &

maintenance center (OMCR) of the BSS or the LMT of the BTS, keep a detailed record of the

alarm information, and contact the technical personnel in time to locate and eliminate faults.

A. In the OMCR of the BSS, the current alarms are displayed in real time, and the rack

diagram and the alarm statuses of boards are displayed dynamically in the main interface

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Chapter 1 Equipment MaintenanceAlarm Handling

of alarms. The recovered history alarms, current alarms and ordinary notifications can be

queried as needed. For the procedure of querying alarms, please see ZXG10-BSS (V1A)

Operation Manual; for the alarm causes and handling process, please see ZXG10-BSS

(V1A) Maintenance Manual.

B. Whether the Abis link is connected through or not, the LMT system of the BTS permits

the maintenance personnel to query the alarm status of boards in the site, including alarm

mode, alarm location, alarm content, fan running condition and rack temperature. Multiple

alarms may exist on the same board at a time, and the board color on the alarm viewing

interface represents the top alarm level existing on this board. Click the board, and all

alarm information on this board will be displayed. For the procedure of querying alarms,

please see ZXG10-BTS (V1A) Operation Manual; for alarm causes and handling process,

please see Chapter 2 of this Manual.

2) Running status of boards

Check whether the indication of the indicators for each board in the rack is normal. If any alarm

indicator is on, contact the technical personnel in time to locate and eliminate the fault.

The running information of the ZXG10-BTS (V1A) mainly comes from the indicators on the

panels of modules such as OMU and TRU. By the different flashing meanings of the indicators,

you can determine the running status of the equipment basically. For the meanings, causes and

handling of various indicator statuses, please see Section 3.1 of this Manual.

1.2.2Regular routine maintenance

Regular routine maintenance includes the following items:

1. Checking the BTS modules

Check the amount, model and version of spare modules once a week, and make sure that the spare

modules are stored in compliance with the requirements, with adequate amount and the convenience

to find. Check the back-to-fix conditions of faulty modules once a week.

2. Hardware checking: once a month.

1) Cleaning the rack

Clean the surface of the cabinet, clean and dry the air filter at the bottom of the cabinet; check

whether the cabinet is rusted, and whether there is any unrelated article in the cabinet. Report

any difficult problems in time if any, so as to get an early repair.

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2) Checking the connection of power cables

Check whether the power cables are connected tightly, and whether there is rust.

3) Checking the connection of grounding cables

Check whether the grounding cables are connected tightly, and whether there is rust.

4) Checking the power modules

Check whether the power supply of each shelf can work independently. Contact the technical

personnel in time for any problem so as to fix the problem.

3. Transmission

Check the connector tightness of the transmission cables from the optical terminal/microwave rack

to the BTS rack once every quarter, and keep the transmission cables free from twisting, pressing,

deforming and over-tightness; and test the spare ports.

4. Antenna and feeder system

Adjust and calibrate the direction and pitch angle of the antenna once half a year; tighten the

antenna, outdoor jumper, feeder cable and indoor jumper; apply rust-proof treatment to the antenna

pole, feeder cable rack and grounding bar which are subject to getting rusty; test the VSWR of the

antenna and feeder system, the transmitting power of the PA; and perform a general test on all

frequencies of all cells of each BS.

1.3Emergent maintenance

Emergent maintenance refers to the maintenance task which needs to be handled immediately in

response to the emergent fault of ZXG10-BTS (V1A) equipment. Emergent faults are characterized

by abrupt occurrence and serious influence on the QoS, so the maintenance personnel of the

equipment room are required to handle them decisively, cautiously and in-time. A detailed record

should be made afterward so as to eliminate potential faults.

Generally, the emergent handling process and measures for emergent faults can be summarized

based on the following two types of faults:

1. Emergent faults and disasters in the environment of the equipment room

1) Major faults: Fault of the power supply system; floods, fires; faults of the air conditioner

system which cause the temperature and humidity severely beyond the specifications.

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2) Maintenance measures: When any alarm information is observed from the OMCR of the

BSS or the LMT system of the BTS, perform an immediate inspection on the environment of

the equipment room, locate the fault cause, and eliminate the fault quickly. Afterward, report to

the superior leaders and keep a detailed record to eliminate potential faults.

2. Emergent fault of the equipment

1) Major faults: including hardware faults, e.g., damage of boards and modules, not-in-position,

poor contact, and software faults, e.g., disorder of data and program, and improper upgrading.

2) Maintenance measures:

A. Through plugging/unplugging, some faults such as not-in-position and poor contact of

the hardware system can be solved; through the replacing or isolation method, the faults

such as hardware damage can be located; the data disorder can be queried and corrected

through operations in the OMCR of the BSS or the LMT system of the BTS.

B. Faults of the software and hardware are numerous and complicated. If the above simple

methods fail to solve the problem, please contact the technical personnel or the regional

office of ZTE Corporation, report to the relevant leaders, and keep a detailed record

afterward so as to eliminate potential faults.

1.4Typical maintenance methods

In daily maintenance, several typical maintenance methods can be used as follows:

1. Observation method

Locating the fault by viewing the alarm information of the LMT of the BTS. The observation

method is the first method the maintenance personnel should use in case of fault occurrence. Making

a correct judgement on the observation result is a key step for correct analysis and handling of the

fault. Therefore, the maintenance personnel must be very familiar with the indicator statuses of the

boards, and fully aware of the meanings of the alarm information of different levels on the LMT of

the BTS.

2. Plugging/unplugging method

When a circuit board is initially found faulty, plug/unplug the circuit board and the external interface

connector to eliminate such faults as poor contact or processor abnormality. Make sure that the board

must be hot-swappable when this method is applied.

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3. Replacing method

The replacing method is to check the fault by replacing the circuit board in question with a normal

circuit board. When the plugging/unplugging method fails, the replacing method can be applied.

When plugging/unplugging and replacing the board, please see the precautions and operation

procedure for replacing the boards and parts as listed in Appendix A.

4. Isolation method

When a part of the system is faulty, the involved circuit board or racks can be isolated to check

whether the fault comes from mutual impact. For example, a typical application of the isolation

method is to self-loop the I/O interface of a circuit board so as to isolate and solve the problem of the

related system.

5. Self-test method

When the system or circuit board is powered on again judge if there is any fault by way of self-test.

Usually, when a circuit board is re-powered on for self-test, the indicators on its panel will flash

regularly, so that we can check whether the circuit board itself is faulty.

6. Pressing method

Such faults as poor contact can be removed by pressing the chips and cable connectors.

7. Comprehensive method

Any fault can be cleared by combining the above methods and taking advantage of one’s

maintenance experience.

1.5Relevant maintenance tables

1.5.1Routine maintenance and operation record table

The daily maintenance record table is shown in Table 1-1. The regular maintenance table is shown in

Table 1-2. The maintenance item periodical summary table is shown in Table 1-3.

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Table 1-1 Daily maintenance record table

Items Operation item Equipment running status and

handling result

Operator Remarks

Equipment

room

environment

Temperature

Humidity

Working status of

the air conditioner

Dust-proof

Equipment

running status

Querying the alarm

information

Running status of

boards

Table 1-2 Regular maintenance record table

Items Operation item Equipment running status and

handling result

Operator Remarks

Check the

BTS module

Check the BTS

module

Hardware:

check

Clean the rack

Check the

connection of power

cables

Check the

connection of

grounding cables

Check the power

module

Transmission Transmission

Antenna and

feeder

System

Antenna and feeder

system

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Table 1-3 Maintenance item periodical summary table

Items Operation item Maintenance

period

Equipment running status

and handling result

Operator Remarks

Equipment room

environment

Temperature Daily

Humidity Daily

Working status of

the air conditioner

Daily

Dust-proof Daily

Equipment

running status

Querying the

alarm information

Daily

Running status of

boards

Daily

BTS module

check

Check the BTS

module

Weekly

Hardware:

check

Clean the racks Monthly

Check the

connection of

power cables

Monthly

Check the

connection of

ground cables

Monthly

Check the power

module

Monthly

Transmission Transmission quarterly

Antenna and

feeder

System

Antenna and

feeder system

Half a year

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1.5.2Emergent maintenance and operation record table

The emergent fault handling record table is shown in Table 1-4.

Table 1-4 Emergent fault handling record table

Exchange name: Person to handle:

Time Time of fault resolved:

Fault source: ٱ informed by the user ٱ alarm system ٱ found in daily routine maintenance ٱ

others

Fault category:

Fault description:

Handling method:

Result:

Remarks by the person in charge:

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2 Alarm Handling

2.1Alarm information and classification

The alarm management of the LTM system is an important part of BTS local operation and

maintenance. The LMT system, after it is put into operation, can perform centralized monitoring on

the overall running condition of the BTS for the purpose of real-time maintenance and recovery.

Whether the Abis link is connected through or not, the LMT system permits the maintenance

personnel to query the alarm status of boards in the site, and view the site alarms and rack alarm

information on the LMT alarm viewing interface.

Boards that may send alarms include:

1. Boards in the public shelf: operation and maintenance unit (OMU), BS interface equipment (BIE),

clock unit (CKU), external alarm collection module (EAM), signaling distribution unit (SDU) and

power supply (PSA).

2. Boards in the carrier shelf: frame unit (FU), carrier unit (CU), power supply (PSB), power

amplifier (PA), combiner HYCOM and multi-coupler MUL.

3. Others: fan, temperature.

In terms of real-time handling, the alarms include ordinary notifications and alarms. Ordinary

notifications only indicate unrepeatable or transient faults during the system running. Usually, if a

notification is not frequently repeated, it may be caused accidentally by the environment, which

needs no handling; if a notification is frequently repeated, or even the alarm occurs for a long time, it

must be checked and solved in time.

An alarm usually lasts for a certain time. According to the severity in the system, alarms are divided

into four levels. Following is the division of the four alarm levels, as shown in Table 2-1.

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Table 2-1 Division of alarm levels

Alarm

level

The scope of

services seriously

affected

The scope of

equipment safety

seriously affected

The scope of system

running reliability

seriously affected

The scope of

system

maintainability

seriously affected

1 The whole BSS The whole BSS

2 One or some sites BSC or a site The whole BSS The whole BSS

3 One or some carriers One or some carriers BSC or a site BSC or a site

4 One or some

channels

No influence One or some carriers One or some

carriers

Note: In the definition of the alarm levels, the affected scope only refers to one single index. That is,

if the affected scope of one single index, e.g., reliability, security reaches the specified scope, the

level of the alarm can be determined basically. If one alarm item has affected several indexes, the

alarm level should be raised.

The alarm information summary table of the LMT is shown in Table 2-2. For the detailed

information of the alarm, e.g., alarm cause, time limit of handling, handling process, please see

relevant contents of Section 2.2~2.5.

Table 2-2 Alarm information summary table

Alarm code Alarm name Alarm level

0xC00 Alarm of the main clock signal of the BS CKU 2

0xD00 Software version error of the BS interface equipment 2

0x1301 Major alarm of standing wave ratio of the transmitter

combiner

2

0x1701 Communication interruption of the OMU. 2

0xA08 Data check error of both the main-set and sub-set uplink

data from the receiving processor to the channel

processor (DSP0).

3

0xA09 Data check error of both the main-set and sub-set uplink


processor (DSP1).

3

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(continued)


0xA0A Data check error of both the main-set and sub-set uplink


processor (DSP2).

3

0xA0B Data check error of both the main-set and sub-set uplink


processor (DSP3).

3

0xA0D Fault of the interface clock between the frame unit

controller and the BS CKU.

3

0xA0E Read/write error of the flash memory in the frame unit 3

0xA18 Overflow of the “watchdog” in the frame unit controller 3

0xA26 LAPD link disconnection of the frame unit controller and

the BSC

3

0xB00 Downlink check error between the frame unit and carrier

unit

3

0xA23 Inconsistency of the channel processor (CHP) software

version

3

0xA24 Inconsistency of the frame unit controller (FUC) software

version

3

0xB04 Out-of-lock of transmitting RF self oscillator 3 3

0xB05 Out-of-lock of transmitting RF self oscillator 4 3

0xB06 Out-of-lock of transmitting intermediate frequency self

oscillator 5

3

0xB0F Wrong carrier unit (CU) software version 3

0xC0C Wrong BS CKU software version 3

0xF2A Wrong BS environment alarm board layer-3 software

version

3

0xC01 Alarm of BS CKU frame numbers 3

0xC09 Error of the BS CKU parameter configuration 3

0xC0A Abnormality of the 8K clock signal between BS interface

equipment (BIE) and the BS CKU

3

0xD01 Fault of the BIE switching chip 1 3


Chapter 2 Alarm Handling

-13-

(contiued)




0xD05 Read/write fault of E1 interface chip 1 of the BIE 3



0xD08 Loss of E1 interface signal 1 of the BIE 3

0xD09 Loss of E1 interface signal 2 of the BIE 3

0xD0A Loss of E1 interface signal 3 of the BIE 3

0xD11 Alarm of out-of-frame of E1 interface signal 1 of the BIE 3



0xF01 Alarm of fan 1 3









0xF0D Alarm of temperature sensor 1 3

0xF0E Alarm of temperature sensor 2 3

0xF0F Alarm of temperature sensor 3 3

0xF10 Alarm of temperature sensor 4 3



0x1002 Fault of the frame unit bus 3

0x1003 Fault of the low-speed bus 3

(contiued)

-14-



0x1100 Alarm of the PA output power 3

0x1101 Alarm of the PA voltage standing wave ratio 3

0x1102 Alarm of the PA tube over-current 3

0x1103 Alarm of PA tube over-voltage 3

0x1105 Major alarm of PA over-temperature 3

0x1200 Alarm of low-noise amplifier 1 of the receiver multi-

coupler

3

0x1201 Alarm of low-noise amplifier 2 of the receiver multi-

coupler

3

0x1400 Alarm of the power supply of the carrier shelf 3

0x1500 Alarm of the power supply of the public shelf 3

0x1702 Communication interruption of the BS interface board 3

0x1703 Communication interruption of the BS CKU 3

0x1704 Communication interruption of the BS environment

alarm unit

3

0x1708 Communication link disconnection of the power board of

the public shelf

3

0x1801 BS OMU unreported till timeout 3

0x1804 BS environment alarm board unreported till timeout 3

0x1106 Alarm of the current, voltage and temperature of the 80W

PA

3

0x1107 Alarm of the consistency of the two 80W PAs in terms of

the forward power and type, and the standing wave ratio

of the PA on the left

3

0xA22 Inconsistent configuration of cell parameters 3

0xB08 Error of parameter configuration of the carrier unit 3

0xD14 Error of link parameter configuration of the BIE 3

0xF2B No response of the layer-3 software of the BS

environment alarm board

3

0x1300 Minor alarm of standing wave ratio of the transmitter

combiner

3

(contiued)


-15-


0xA04 Initialization failure of the digital processor 0 in the

transceiver

4

0xA05 Initialization failure of digital processor 01 in the

transceiver

4


transceiver

4


transceiver

4

0xA10 Software overflow of digital processing unit 0 in the

transceiver

4


transceiver

4


transceiver

4


transceiver

4

0xA14 Check error of one channel of the uplink data from the

RPP to the CHP (DSP0)

4



4



4



4

0xA19 Cross-threshold of the flash memory programming times

in the frame unit controller

4

0xA1A Channel 0 parameter configuration error 4

0xA1B Channel 1 parameter configuration error 4

0xA1C Channel 2 parameter configuration error 4

0xA1D Channel 3 parameter configuration error 4

0xA1E Channel 4 parameter configuration error 4

0xA1F Channel 5 parameter configuration error 4

(continued)


-16-


0xA20 Channel 6 parameter configuration error 4

0xA21 Channel 7 parameter configuration error 4

0xB02 Out-of-lock of receiving RF self oscillator 1 4

0xB03 Out-of-lock of receiving RF self oscillator 2 4

0xB07 Out-of-lock of receiving IF self oscillator 6 4

0xC08 Alarm for out-of-lock of phase-locked loop of the BS

CKU

4

0xC0D No response of layer-3 software of the BS CKU 4

0xD15 No response of the layer-3 software of the BS BIE 4

0xB10 No response of the layer-3 software of the carrier unit

(CU)

4

0xD0B Forward slide code indication of the BIE E1 interface

signal 1

4

0xD0C Forward slide code indication of the BIE E1 interface

signal 2

4

0xD0D Forward slide code indication of the BIE E1 interface

signal 3

4

0xD0E Backward slide code indication of the BIE E1 interface

signal 1

4

0xD0F Backward slide code indication of the BIE E1 interface

signal 2

4

0xD10 Backward slide code indication of the BIE E1 interface

signal 3

4

0x1000 Cross-threshold of the flash memory programming times

of the BS OMU

4

0x1001 Failure of flash memory programming of the BS OMU 4

0x1004 The standby board of the BS OMU not in position 4

0x1104 Minor alarm of PA over-temperature 4

0x1705 Communication interruption of the frame unit 4

0x1706 Communication link disconnection of the carrier unit 4

(continued)


-17-


0x1709 Communication link disconnection of the power board of

the carrier shelf

4

0x170A Communication link disconnection of the PA 4

0x170B Communication link disconnection of the multi-coupler 4

0x170D Communication link disconnection of the combiner 4

0x1802 The BS interface board unreported till timeout 4

0x1803 The BS CKU unreported till timeout 4

0x1805 The frame unit unreported till timeout 4

0x1806 The carrier unit unreported till timeout 4

0x1808 The public shelf power board unreported till timeout 4

0x1809 The carrier shelf power board unreported till timeout 4

0x180A The PA unreported till timeout 4

0x180B The multi-coupler unreported till timeout 4

0x180D The hybrid combiner unreported till timeout 4

0x1108 80W PA link alarm 4

2.2Level-1 alarm

None.

2.3Level- 2 alarm

2.3.1Alarm of the main clock signal of the BS CKU

Alarm code: 0xC00

Alarm content: Alarm of CKU main clock signal

Alarm level: 2

Alarm cause: hardware fault

Influence of the alarm: If the alarm occurs to an active CKU, this BS will fail to work normally; if

the alarm occurs to a standby CKU, the running reliability of the system will deteriorate.

Time limit of handling: Handle it at once.

-18-


Handling process: Replace the CKU board

Alarm type: Equipment alarm

2.3.2Software version error of the BIE

Alarm code: 0xD00

Alarm content: BIE (software version error)Alarm level: 2

Alarm cause: software version error, or wrong alarm caused by communication error

Influence of the alarm: The system fails to start normally.


Handling process:

1. Insert the board properly and reset it.

2. If the alarm still exists, the board may be faulty, please replace the board.

3. If the alarm still exists, the board software version may be inconsistent with the OMU background

database. Please contact the regional office of ZTE Corporation.

Alarm type: Wrong handling.

2.3.3Major alarm of the standing wave ratio of the transmitter combiner

Alarm code: 0x1301

Alarm content: Major alarm of the standing wave ratio of the transmitter combiner

Alarm level: 2

Alarm cause: The external terminal of the combiner is open-circuited or of high resistance, the EAM

receives interference signals or the EAM alarm line is wrongly connected.

Influence of the alarm: The PA transmitting power is off protectively, and the corresponding cell fails

to work.


Handling process:


-19-

1. Check whether the EAM works normally.

2. Check whether the EAM alarm cable of the backplane is faulty. If the alarm occurs together with

the “minor alarm of the standing wave ratio of the transmitter combiner”, the backplane alarm line

may be faulty.

3. If the alarm indicator on the panel is on at the same time, it is required to check whether the

connectors between the set-top jumper, main feeder and antenna are poorly contacted, and check for

water leakage.

4. If none of the above measures works, please contact the regional office of ZTE Corporation.


2.3.4Communication interruption of the OMU

Alarm code: 0x1701

Alarm content: OMU communication interruption

Alarm level: 2

Alarm cause: LAPD link disconnection between OMU and BSC, OMU fault, BTS rack power-off,

fault of LAPD, SMB, T network board of the BSC, etc.

Influence of the alarm: Affecting the reset and startup of the BTS and the information transmission

between the BTS and the BSC, and the operation and maintenance of BTS will be interrupted.


Handling process:

1. Check whether the boards of BSC, e.g., LAPD, SMB, work normally, and whether there is any

alarm present, if there is, clear it first.

2. Check whether the LAPD timeslot of the OMU is allocated correctly.

3. Check whether the E1 line is connected through.

4. Check whether the BTS rack is powered on, and whether OMU is started normally.

5. Check whether the BIE of BTS works normally. Clear the alarms first if any.

-20-



Alarm type: Communication alarm

2.4Level- 3 alarm

2.4.1Check error of the uplink data from the receiving processor to the

channel processor

2.4.1.1Data check error of both the main-set and sub-set uplink data from the receiving

processor to the channel processor (DSP0)

Alarm code: 0xA08

Alarm content: Data check error of both the main-set and sub-set uplink data from the receiving

processor (RPP) to the channel processor (CHP) (DSP0)

Alarm level: 3

Alarm cause: Severe interference exists in the transmission channel from the RPP to the CHP (or the

lines are poorly contacted).

Influence of the alarm: The signal quality of the radio interface will deteriorate drastically, affecting

the voice quality and even the assignment will fail.

Time limit of handling: Handle it as soon as possible.

Handling process:

1. Check whether the CKU is properly inserted.

2. Check whether the backplane line gets loose.

3. Check whether the bit switch for the transmission matching resistance on the backplane is set

properly.

4. If none of the above operations works, reset the BTS to check if the fault still exists.




-21-


processor to the channel processor (DSP1).

Alarm code: 0xA09



Alarm level: 3



Influence of the alarm: The signal quality of the radio interface will deteriorate drastically, the uplink

bit error will occur in timeslot 1 and timeslot 5. In serious situations, the conversation will be

interrupted and the assignment will fail.


Handling process:




properly.






Alarm code: 0xA0A



Alarm level: 3

-22-








Handling process:




properly.






Alarm code: 0xA0B



Alarm level: 3








-23-

Handling process:




properly.




2.4.2Frame unit fault

2.4.2.1Fault of the interface clock between the frame unit controller and the BS CKU

Alarm code: 0xA0D

Alarm content: Fault of FUC_CKU interface clock

Alarm level: 3

Alarm cause: Fault of the BTS CKU, fault of the transmission clock line, or fault of the clock

interface on the FU.

Influence of the fault: Affecting the normal communication between the baseband processing unit

and OMU and CU, resulting in failure of normal operation of the whole CU.


Handling process:

1. Check whether alarms occur on the CKU board.

2. Check whether the line between the CKU and CU is connected reliably.

3. If none of above measures works, replace the TRU.


-24-


2.4.2.2Read/write error of the flash memory in the FU

Alarm code: 0xA0E

Alarm content: FLASH MEMORY error

Alarm level: 3

Alarm cause: Too many times of the FLASH programming, read/write error or the software

checksum error.

Influence of the alarm: The baseband processing unit fails to obtain the correct software version

from the flash memory, and the whole FU fails to work normally.


Handling process:

1. Reset the FU first to see whether the alarm can be recovered. If this alarm can be recovered, it

indicates this alarm is caused by external interference when the CPU reads the data from the flash

memory. This FU should be able to work normally after resetting.

2. If this alarm cannot be recovered by resetting, contact the regional office of ZTE Corporation as

soon as possible.


2.4.2.3Overflow of the “watchdog” in the FUC

Alarm code: 0xA18

Alarm content: Overflow of the WatchDog in the FUC.

Alarm level: 3

Alarm cause: The FUC program is out of service.

Influence of the alarm: No response of DSP or partial channels unavailable.


Handling process:


-25-

1. Reset the FUC first to see whether this alarm can be recovered.


soon as possible.


2.4.2.4LAPD link disconnection of the FUC and the BSC

Alarm code: 0xA26

Alarm content: LAPD link disconnection of FU and BSC.

Alarm level: 3

Alarm cause: No connection between layer-2 software of the FUC and the BSC during a certain

period of time.

Influence of the alarm: This FUC fails to work. If this FUC is BCCH-TRX, services of the cell will

be affected.


Handling process:

1. Check whether this alarm occurs to other FUCs of this BS. If this alarm occurs to all FUCs of this

BS, check whether any alarm occurs to the BIE and whether the E1 line is connected properly, and

check whether any alarm occurs to the SMB, LAPD and DSN board of the BSC. If any, locate this

fault and clear it.

2. Check whether the BSC data is correct, especially the T network connection data and the SMB

timeslot connection data.

3. If only the LAPD of one layer TRU is disconnected, check whether the backplane cable is

connected properly.

4. If only the LAPD of one TRU is disconnected, reset the FUC.

5. If the problem still exists, please contact the regional office of ZTE Corporation.


-26-


2.4.2.5Downlink check error between the FU and the CU

Alarm code: 0xB00

Alarm content: DLRC_AL downlink check error

Alarm level: 3

Alarm cause: Interference occurs to the link between the FU and CU.

Influence of the alarm: Numerous bit errors occur between CHP and CUI. The downlink is faulty,

and this TRU fails to provide normal conversation service.


Handling process:

1. Check whether the frequency-hopping cable on the backplane is connected properly. If not,

replace the frequency-hopping cable.

2. If the fault still exists, this TRU is faulty, please replace the board.


2.4.3Inconsistency of software versions

2.4.3.1Inconsistency of the channel processor (CHP) software versions

Alarm code: 0xA23

Alarm content: Inconsistency of the CHP software versions

Alarm level: 3

Alarm cause: Error loading of CHP software versions

Influence of the alarm: DSP fails to run normally over FU.


Handling process: Download a new CHP software version.

Alarm type: Error handling.


-27-

2.4.3.2Inconsistency of the frame unit controller (FUC) software versions

Alarm code: 0xA24

Alarm content: Inconsistency of the FUC software versions

Alarm level: 3

Alarm cause: Error loading of FUC software versions

Influence of the alarm: FUC fails to run normally.


Handling process: Download a new FUC software version.


2.4.4Out-of-lock of the transmitting RF self oscillator

2.4.4.1Out-of-lock of the transmitting RF self oscillator 3

Alarm code: 0xB04

Alarm content: Out-of-lock of the transmitting RF self oscillator 3

Alarm level: 3

Alarm cause: Clock signal instability or TRU phrase-locked loop failure

Influence of the alarm: This TRU may fail to make a call.


Handling process: Replace the TRU.


2.4.4.2Out-of-lock of the transmitting RF self oscillator 4

Alarm code: 0xB05

Alarm content: Out-of-lock of the transmitting RF self oscillator 4

-28-


Alarm level: 3






2.4.4.3Out-of-lock of the transmitting IF self oscillator 5

Alarm code: 0xB06

Alarm content: Out-of-lock of the transmitting IF self oscillator 5

Alarm level: 3






2.4.5Error of software versions

2.4.5.1Error of the carrier unit (CU) software version

Alarm code: 0xB0F

Alarm content: The CU software version error

Alarm level: 3

Alarm cause: The CU software version error

Influence of the alarm: The CU fails to start normally, and this TRU cannot make a call.


-29-


Handling process:

1. Reset TRU.

2. If the resetting fails, contact the regional office of ZTE Corporation to replace the CU version.


2.4.5.2Error of the BS clock unit (CKU) software version

Alarm code: 0xC0C

Alarm content: The CKU software version error

Alarm level: 3

Alarm cause: The CKU software version error

Influence of the alarm: This BS can operate normally but is unable to be maintained and monitored.


Handling process:

1. Reset the CKU to see whether this alarm can be recovered.

2. If this alarm cannot be recovered, contact the regional office of ZTE Corporation as soon as

possible.


2.4.5.3Error of the BS external alarm module (EAM) layer3 software version

Alarm code: 0xF2A

Alarm content: The EAM layer3 software version error

Alarm level: 3

Alarm cause: The layer3 software version error or communication error

Influence of the alarm: OMU fails to monitor the running of EAM, and in-cabinet alarms and those

-30-


of external backbone nodes.


Handling process:


2. In case that the alarm persists, contact the regional office of ZTE Corporation to replace the

version.


2.4.6Fault of the BS clock unit (CKU)

2.4.6.1Alarm of error BS CKU frame numbers

Alarm code: 0xC01

Alarm content: The CKU frame numbers error

Alarm level: 3

Alarm cause: Discontinuity or loss of frame numbers

Influence of the alarm: This BS fails to run normally.


Handling process:

1. Reset the CKU, and view whether the alarm occurs again.

2. If the alarm cannot be recovered, replace the CKU.


2.4.6.2Error of the BS CKU parameter configuration

Alarm code: 0xC09

Alarm content: The CKU parameter configuration error

Alarm level: 3


-31-

Alarm cause: Parameter configuration error

Influence of the alarm: This BS can operate normally but fails to be synchronous over the entire

network.


Handling process: Re-configure the CKU parameters on the background and make the CKU

parameters synchronous with the BS.


2.4.6.3Abnormality of the 8K clock signal between BS interface equipment (BIE) and CKU

Alarm code: 0xC0A

Alarm content: Abnormality of the 8K clock signal between BIE and CKU

Alarm level: 3

Alarm cause: Abnormality of the 8K clock signal between BIE and CKU

Influence of the alarm: This BS can operate normally but fails to be synchronous over the entire

network.


Handling process:

1. Reinsert the CKU board or reset the CKU board.

2. Check the operation of the BIE board or reset the BIE board.

3. Check the connection of the E1 cable.

4. If the alarm exists still, set the synchronization mode of the CKU to the free-run mode, and then

contact the regional office of ZTE Corporation.


-32-


2.4.7Fault of BIE switching chips

2.4.7.1Fault of the BIE switching chip 1

Alarm code: 0xD01

Alarm content: Fault of the BIE switching chip 1

Alarm level: 3

Alarm cause: Faulty chip or abnormal clock signal

Influence of the alarm: The conversation is abnormal, or links between a part of TRUs and BSC

cannot be established, or the system fails to start normally.


Handling process:


2. If the alarm persists, it indicates that the D401 chip on the board may be out of order, replace the

board.

3. If the alarm still exists, the system clock may be abnormal, then reset the CKU.

4. In case that the alarm still exists, contact the regional office of ZTE Corporation .



Alarm code: 0xD02


Alarm level: 3






-33-

Handling process:


2. If the alarm appears again, it indicates that the D402 chip on the board may be out of order,

replace the board.


4. In case that the alarm still exists, contact the regional office of ZTE Corporation.



Alarm code: 0xD03


Alarm level: 3





Handling process:



replace the board.





Alarm code: 0xD04

-34-



Alarm level: 3





Handling process:



board.




2.4.8Faults of the BIE E1 interface

2.4.8.1Read/write fault of the BIE E1 interface chip 1

Alarm code: 0xD05

Alarm content: Read/write fault of the BIE E1 interface chip 1

Alarm level: 3

Alarm cause: Chip or communication failure




Handling process:



-35-


replace the board.




Alarm code: 0xD06


Alarm level: 3

Alarm cause: Chip or communication failure




Handling process:



replace the board.




Alarm code: 0xD07


Alarm level: 3

Alarm cause: Chip or communications failure


-36-




Handling process:



replace the board.



2.4.8.4Loss of the BIE E1 interface signal 1

Alarm code: 0xD08

Alarm content: Loss of BIE E1 interface signal 1

Alarm level: 3

Alarm cause: Chip failure, abnormal clock signal, or poor E1 connection




Handling process:



board.


4. If the alarm still exists, the physical link of the E1 A interface may be abnormal.

5. If the physical link of the E1 A interface is normal, and the alarm still exists, contact the regional

office of ZTE Corporation.


-37-



Alarm code: 0xD09


Alarm level: 3

Alarm cause: Chip failure, abnormal clock signal, or poor E1 connection




Handling process:



replace the board.


4. If the alarm still exists, the physical link of the E1 B interface may be abnormal.

5. If the physical link of the E1 B interface is normal, and the alarm still exists, contact the regional




Alarm code: 0xD0A


Alarm level: 3

Alarm cause: The conversation is abnormal, or links between a part of TRUs and BSC cannot be

established, or the system fails to start normally.

-38-


Influence of the alarm: Cascaded BTSs fails to start.


Handling process:



replace the board.


4. If the alarm still exists, the physical link of the E1 C interface may be abnormal.

5. If the physical link of the E1 C interface is normal, while the alarm still exists, replace the BIE

board of the cascaded BTS.



2.4.8.7Out of frame of the BIE E1 interface signal 1

Alarm code: 0xD11

Alarm content: Out of frame of the BIE E1 interface signal 1

Alarm level: 3

Alarm cause: Chip or clock failure, phase difference from the BSC clock, or poor E1 connection

Influence of the alarm: For occasional occurrence, it has little impact on conversations. But frequent

occurrence (once several minutes) will cause abnormal conversation or abnormal link establishment

between the main rack TRU and the BSC.

Time limit of handling: If it occurs occasionally, and the CKU is in free run mode, this alarm may be

ignored; but for frequent occurrence, handle it as soon as possible.

Handling process:



-39-

2. If the alarm persists, indicating that the D101 chip on the board may be out of order, replace the

board.

3. If the alarm still exists, indicating that the system clock may be abnormal, reset the CKU.


5. If the physical link is normal, and the alarm still exists, contact the regional office of ZTE

Corporation.



Alarm code: 0xD12


Alarm level: 3



occurrence (once several minutes) will cause abnormal conversations or abnormal link establishment

between the extension rack TRU and the BSC.



Handling process:


2. If the alarm appears again, indicating that the D201 chip on the board may be out of order, replace

the board.



5. If the physical link is normal, while the alarm still exists, contact the regional office of ZTE

Corporation.

-40-




Alarm code: 0xD13


Alarm level: 3



occurrence (once several minutes) will cause abnormal conversations or abnormal link establishment

between the cascaded rack TRU and the BSC.



Handling process:


2. If the alarm appears again, indicating that the D301 chip on the board may be out of order, replace

the board.



5. If the physical link is normal, while the alarm still exists, contact the regional office of ZTE

Corporation.


2.4.9Alarm of fans of the BIE

2.4.9.1Fan 1 alarm

Alarm code: 0xF01

Alarm content: Alarm of fan 1


-41-

Alarm level: 3

Alarm cause: Failure of the top fan of the main rack

Influence of the alarm: The poor ventilation of the BTS cabinet will cause the temperature increase

and unstable BTS operation.


Handling process:

1. Observe the running status and alarm cables of EAM. If there is an alarm for EAM or the

backplane alarm cables are not connected properly, solve these problems first.

2. Observe whether the fan in this position is switched on.

3. If the fan is switched on already, while the alarm still exists, contact the regional office of ZTE

Corporation.


2.4.9.2Fan 2 alarm

Alarm code: 0xF02


Alarm level: 3

Alarm cause: Failure of the middle fan of the main rack




Handling process:




-42-



Corporation.


2.4.9.3Fan 3 alarm

Alarm code: 0xF03


Alarm level: 3

Alarm cause: Failure of the bottom fan of the main rack




Handling process:





Corporation.


2.4.9.4Fan 4 alarm

Alarm code: 0xF04


Alarm level: 3

Alarm cause: Failure of the top fan of the extension rack 1



-43-



Handling process:

1. Observe the running status and alarm cables of EAM, if there is an alarm for EAM or the




Corporation.


2.4.9.5Fan 5 alarm

Alarm code: 0xF05


Alarm level: 3

Alarm cause: Failure of the middle fan of the extension rack 1




Handling process:





Corporation.


-44-


2.4.9.6Fan 6 alarm

Alarm code: 0xF06


Alarm level: 3

Alarm cause: Failure of the bottom fan of the extension rack 1




Handling process:





Corporation.


2.4.9.7Fan 7 alarm

Alarm code: 0xF07


Alarm level: 3

Alarm cause: Failure of the top fan of the extension rack 2




Handling process:


-45-





Corporation.


2.4.9.8Fan 8 alarm

Alarm code: 0xF08


Alarm level: 3

Alarm cause: Failure of the middle fan of the extension rack 2




Handling process:





Corporation.


2.4.9.9Fan 9 alarm

Alarm code: 0xF09


-46-


Alarm level: 3

Alarm cause: Failure of the bottom fan of the extension rack 2




Handling process:





Corporation.


2.4.10Alarm of temperature sensor

2.4.10.1Alarm of temperature sensor 1

Alarm code: 0xF0D

Alarm content: Alarm of temperature sensor 1

Alarm level: 3

Alarm cause: The temperature at the upper part of the main rack is too high.

Influence of the alarm: The high temperature inside the BTS cabinet will cause the unstable BTS

operation.


Handling process:




-47-

2. Observe whether the fan is switched on already, if not, switch on the fan.

3. Observe whether the temperature is too high, and check the running of the air conditioner.

4. If the environment temperature cannot be lowered, shut down part of TRU to lower the

temperature inside the rack.

5. If both the fan and air conditioner are normal, while the alarm still exists, contact the regional




Alarm code: 0xF0E


Alarm level: 3

Alarm cause: The temperature at the lower part of the main rack is too high.


operation.


Handling process:



2. Observe whether the fan is switched on already; if not, switch on the fan.







-48-



Alarm code: 0xF0F


Alarm level: 3

Alarm cause: The temperature at the upper part of the extension rack 1 is too high.


operation.


Handling process:











Alarm code: 0xF10


Alarm level: 3

Alarm cause: The temperature at the lower part of the extension rack 1 is too high.



-49-

operation.


Handling process:











Alarm code: 0xF11


Alarm level: 3

Alarm cause: The temperature at the upper part of the extension rack 2 is too high.


operation.


Handling process:




-50-









Alarm code: 0xF12


Alarm level: 3

Alarm cause: The temperature at the lower part of the extension rack 2 is too high.


operation.


Handling process:











-51-

2.4.11Fault of buses

2.4.11.1Fault of the frame unit bus

Alarm code: 0x1002

Alarm content: FUBUS fault (communication interruption between OMU and all FUs)

Alarm level: 3

Alarm cause: High-speed HDLC bus failure, or OMU hardware error

Influence of the alarm: FUC and CHP versions and parameter configurations cannot be updated, and

alarms cannot be reported.


Handling process:

1. Reset or reinsert the OMU board.

2. Check the backplane and its connections.

3. If none of the measures works, contact the regional office of ZTE Corporation.


2.4.11.2Fault of the low-speed bus

Alarm code: 0x1003

Alarm content: OBBUS fault (communication interruption between OMU and BIE, CKU and EAM)

Alarm level: 3

Alarm cause: Low-speed (64K) HDLC bus failure, or OMU hardware error

Influence of the alarm: Parameter configurations of low-speed boards cannot be updated, and alarms

cannot be reported.


Handling process:

-52-


1. Reset or reinsert the board.

2. Check the backplane and its connections.



2.4.12Alarm of power amplifiers (PAs)

2.4.12.1Alarm of the PA output power

Alarm code: 0x1100

Alarm content: Alarm of the PA output power

Alarm level: 3

Alarm cause: The direct reason is that the PA output power is different from the CU control power

by over one time. And it may be caused by the aged PA, failed power detection circuit and narrow

range of the detection threshold.

Influence of the alarm: This TRU may be unable to communicate, and the power is out of control,

and CUI shuts down the PA.


Handling process:

1. Reset the TRU and see whether the alarm can be recovered.

2. Replace the PA board or TRU, and contact the regional office of ZTE Corporation.


2.4.12.2Alarm of the PA voltage standing wave ratio

Alarm code: 0x1101

Alarm content: Alarm of the PA voltage standing wave ratio

Alarm level: 3

Alarm cause: The direct reason is that the reverse power is too high. And it may be caused by the


-53-

open PA output or high impedance.

Influence of the alarm: This TRU cannot communicate and the PA is damaged.


Handling process:

1. Check the connection of the PA output with the cable, making the connection proper.

2. Check the PAC detection circuit, if the PA board fails, replace it.


2.4.12.3Alarm of over-current of the PA tube

Alarm code: 0x1102

Alarm content: Alarm of over-current of the PA tube

Alarm level: 3

Alarm cause: Over-current of the PA tube

Influence of the alarm: The PA is damaged, and the CUI shuts down the power output for protection.


Handling process: Check the PAC detection circuit, if the PA board fails, replace the PA board.


2.4.12.4Alarm of over-voltage of the PA tube

Alarm code: 0x1103

Alarm content: Alarm of over-voltage of the PA tube

Alarm level: 3

Alarm cause: Over-current of the PA tube

Influence of the alarm: The PA is damaged, and the CUI shuts down the power output for protection.

-54-



Handling process: Check the PAC detection circuit, if the PA board fails, replace the PA board.


2.4.12.5Major alarm of over-temperature of the PA

Alarm code: 0x1105

Alarm content: Major alarm of over-temperature (>=80˚C) of the PA

Alarm level: 3

Alarm cause: The PA temperature is too high, which may be caused by its long-term full-power

operation, the long-term off status of fans, over-temperature of the environment, or faults of the

detection circuit.

Influence of the alarm: The power output of this TRU is shut down for protection, and the PA ages

more quickly.


Handling process:

1. Check the running of fans and the environment temperature.

2. If the fan works normally and the environment temperature is normal, while the PA temperature

alarm exists still, it may be caused by the faulty detection circuit, so replace the PA as soon as

possible.


2.4.13Alarm of low-noise amplifiers of the receiver multi-coupler

2.4.13.1Alarm of low-noise amplifier 1 of the receiver multi-coupler

Alarm code: 0x1200

Alarm content: Alarm of low-noise amplifier 1 of the receiver multi-coupler

Alarm level: 3


-55-

Alarm cause: Faulty low-noise amplifier of the multi-coupler, interference signals received by EAM,

or error connections of EAM alarm cables

Influence of the alarm: The faulty low-noise amplifier of the multi-coupler will affects

conversations, while the alarm caused by the interference signal received by EAM will have no

impact.


Handling process:


2. Check whether the EAM alarm cable of the backplane is faulty. If the alarm occurs at the same

time as the “alarm of low-noise amplifier 2 of the receiver multi-coupler”, something may be wrong

with the backplane alarm cable.



2.4.13.2Alarm of low-noise amplifier 2 of the receiver multi-coupler

Alarm code: 0x1201

Alarm content: Alarm of low-noise amplifier 2 of the receiver multi-coupler

Alarm level: 3

Alarm cause: Faulty low-noise amplifier of the multi-coupler, interference signals received by EAM,

or error connections of EAM alarm cables

Influence of the alarm: The faulty low-noise amplifier of the multi-coupler will affects

conversations, while the alarm caused by the interference signal received by EAM will have no

impact.


Handling process:


2. Check whether anything is wrong with the EAM alarm cable of the backplane. If the alarm occurs

-56-


at the same time as the “alarm of low-noise amplifier 1 of the receiver multi-coupler”, something

may be wrong with the backplane alarm cable.



2.4.14Power alarm

2.4.14.1Alarm of power supply of the carrier shelf

Alarm code: 0x1400

Alarm content: PSB alarm

Alarm level: 3

Alarm cause: Over-voltage, under-voltage, over-current and power-off of the PSB power supply;

interference signals received by EAM or error connections of EAM alarm cables

Influence of the alarm: The PSB power supply fault will affect the carrier shelf, especially the whole

carrier shelf may be out of work in serious cases. The alarm caused by the interference signal

received by EAM or error connection of the EAM alarm cable will have no influence on the system.


Handling process:


2. Check whether anything is wrong with the EAM alarm cable of the backplane.

3. If alarm indicators on the panel light up at the same time, replace the PSB and contact the regional



2.4.14.2Alarm of power supply of the public shelf

Alarm code: 0x1500

Alarm content: PSA alarm


-57-

Alarm level: 3

Alarm cause: Over-voltage, under-voltage, over-current and power-off of the PSA power supply;

interference signals received by EAM or error connections of EAM alarm cables

Influence of the alarm: The PSA power supply fault will affect the public shelf, especially the whole

public shelf may be out of work in serious cases. The alarm caused by the interference signal

received by EAM or error connection of the EAM alarm cable will have no influence on the system.


Handling process:


2. If alarm indicators on the panel light up at the same time, replace the PSA and contact the regional



2.4.15Interruption of board communications

2.4.15.1Interruption of the BS interface board communications

Alarm code: 0x1702

Alarm content: Interruption of the BIE communications

Alarm level: 3

Alarm cause: The HDLC link between OMU and BIE disconnects.

Influence of the alarm: The BIE polling is faulty, and no data can be transferred between BIE and

OMU. Furthermore, the BIE data cannot be configured, and the BIE status cannot be reported.


Handling process: The system runs still, but no data can be configured. If the link of BIE is

disconnected for a long time, users may try the following methods for troubleshooting:

1. Check whether the BIE board is inserted properly.

2. Reset the BIE board to see whether the alarm is recovered.

-58-


3. Check whether the clock board works normally.



2.4.15.2Interruption of the BS CKU communications

Alarm code: 0x1703

Alarm content: Interruption of the CKU communications

Alarm level: 3

Alarm cause: The HDLC link between OMU and CKU is disconnected.

Influence of the alarm: The CKU polling is faulty, and no data can be transferred between CKU and

OMU. Furthermore, the CKU data cannot be configured, and the CKU status cannot be reported.


Handling process: The system runs still, but no data can be configured. If the link of CKU is

disconnected for a long time, users may try the following methods for troubleshooting.

1. Check whether the CKU board is inserted properly.

2. Reset the CKU board to see whether the alarm is recovered.



2.4.15.3Communication interruption of the BS environment alarm unit

Alarm code: 0x1704

Alarm content: Interruption of the EAM communications

Alarm level: 3

Alarm cause: The HDLC link between OMU and EAM is disconnected.

Influence of the alarm: The EAM polling is faulty, and no data can be transferred between EAM and

OMU. Furthermore, the EAM data cannot be configured, and the EAM status cannot be reported.


-59-


Handling process: The system runs still, but no data can be configured. If the alarm is caused only by

the long-term link disconnection of EAM, users may try the following methods for troubleshooting:

1. Check whether the EAM board is inserted properly.

2. Reset the EAM board to see whether the alarm is recovered.

3. Check whether the clock board works normally.



2.4.15.4Interruption of the communication link of the public shelf power supply board

Alarm code: 0x1708

Alarm content: Disconnection of the PSA communication link

Alarm level: 3

Alarm cause: EAM power-off, off-line or faulty; OMU power-off, off-line or faulty

Influence of the alarm: It will impact the PSA operation and maintenance.


Handling process:

1. Check whether there are alarms and faults in the OMU and EAM. If yes, clear the alarms

accordingly.

2. If both the OMU and EAM work normally, check whether the alarm cable of the backplane is

connected properly. For anything abnormal, resolve it.

3. If the fault still exists, replace the board and contact the regional office of ZTE Corporation. .


-60-


2.4.16Timeout of board unreported

2.4.16.1Timeout of the BS OMU unreported

Alarm code: 0x1801

Alarm content: Timeout of the OMU unreported

Alarm level: 3

Alarm cause: The direct reason is that the O&M messages of the board can not be received at the

BSC side in a period. And it may be caused by blocked links and a short timer at the BSC side (the

alarm will be recovered soon); or the interrupted communication link between OMU and BSC.

Influence of the alarm: The alarm conditions of the active/standby OMU and other BTS boards can

not be viewed until the alarm is recovered.


Handling process:

1. If the alarm is recovered soon, improve the quality of the transmission link between BSC and

BTS, or no handling is required.

2. If the alarm cannot be recovered for a long time, check step by step according to alarm items of

“Interruption of communication links between OMU and BSC”.



2.4.16.2Timeout of the BS environment alarm board unreported

Alarm code: 0x1804

Alarm content: Timeout of the EAM unreported

Alarm level: 3

Alarm cause: The direct reason is that the O&M messages of the board can not be received at the

BSC side in a period. And it may be caused by blocked links and a short timer at the BSC side (the

alarm will be recovered soon); or the interrupted communication link of the EAM.


-61-

Influence of the alarm: The alarm conditions of the board can not be viewed until the alarm is

recovered.


Handling process:

1. If the alarm is recovered soon, improve the quality of the transmission link between BSC and

BTS, or no handling is required

2. If the alarm cannot be recovered for a long time, check step by step according to the alarm items

of “Interruption of the EAM communication link”.

3. If there is an alarm caused by timeout of the OMU unreported, handle it before handling the alarm

mentioned here.



2.4.17Alarm of the 80W power amplifier (PA)

2.4.17.1Current, voltage and temperature alarms of the 80W PA

Alarm code: 0x1106

Alarm content: Current, voltage and temperature alarms of the 80W PA

Alarm level: 3

Alarm cause: In the BTS (V1A), the 80W PA is composed of two 40W PAs in parallel connection,

then this alarm refers to the over-current, over-voltage, temperature of over 75˚C and voltage

standing wave ratio alarms of the additional PA tube in the 80W PA.

Influence of the alarm: This alarm indicates that the additional PA in the 80W PA is faulty or the

working condition becomes poor, or the power output is affected, or lifespan of the PA is shortened.


Handling process:

1. Check fans of BTS and the temperature inside the equipment room.

-62-


2. Check whether the PA output cable is connected properly.

3. Check whether the PA fuse is burnt.

4. Replace PAs in pairs.


2.4.17.2Alarm of the consistency of two 40W PAs in terms of forward powers and types, and

the standing wave ratio of the left PA

Alarm code: 0x1107

Alarm content: Alarm of the consistency of two 80W PAs in terms of forward power and types, and

the standing wave ratio of the left PA

Alarm level: 3

Alarm cause: In BTS (V1A), the 80W PA comprises two 40W PAs in parallel connection. The alarm

is caused by bad consistency of the power and phase between the two PAs in the 80W PA.

Influence of the alarm: This alarm indicates that the outputs of the two PAs in the 80W PA are

inconsistent, and that will cause an actual output power of less than 80W.


Handling process:

1. Check whether there are over-current and over-voltage alarms for the two PAs. If yes, first handle

other alarms of the PA.

2. Check cables between PEU and PA.

3. Replace PAs in pairs.


2.4.18Other alarm information

2.4.18.1Inconsistent configuration of cell parameters

Alarm code: 0xA22


-63-

Alarm content: Inconsistent configuration of cell parameters

Alarm level: 3

Alarm cause: Error cell parameter configurations or inconsistent configurations of channel

parameters and CU parameters

Influence of the alarm: Usually the BSC background will check the data validity before

synchronizing the data, and only the valid data can be synchronized, so such alarm seldom appears.

However, it will cause failure of this BTS.


Handling process: Re-configure parameters on the background and make the parameter

synchronization with the BS.


2.4.18.2Error of parameter configuration of the carrier unit

Alarm code: 0xB08

Alarm content: The CU parameter configuration error

Alarm level: 3

Alarm cause: The parameter configuration of CU is wrong or inconsistent.


synchronizing the data, and only the valid data can be synchronized, so such alarm seldom appears.

However, it will cause conversation failure of this TRU.


Handling process:

1. Check whether the inserted TRU is confused. (GSM900/GSM1800/GSM1900 TRUs may be used

confusedly.)

2. Check the software configuration parameters (including the frequency, mode and static power

level).


-64-



2.4.18.3Error of link parameter configuration of the BIE

Alarm code: 0xD14

Alarm content: The BIE link parameter configuration error

Alarm level: 3

Alarm cause: Parameter configurations or communications error

Influence of the alarm: The link establishment between TRU and BSC will be abnormal.


Handling process:


2. If this alarm persists, the BSC background data configuration is wrong. Contact the regional office

of ZTE Corporation.


2.4.18.4No response of the layer-3 software of the BS EAM

Alarm code: 0xF2B

Alarming content: Layer-3 software of the EAM gives no response.

Alarm level: 3

Alarm cause: The OMU cannot receive L3 messages of the EAM in a certain period of time.

Influence of the alarm: The OMU can monitor neither the running status of the EAM board, nor the

alarms in the rack and the alarms of the external dry contact.

Time limit of handling: Handle it at once

Handling process:

1. Wait for 10 minutes to see whether the fault is recovered.


-65-

2. Plug the board properly and reset it.



Alarm type: Equipment alarm.

2.4.18.5Minor alarm of standing wave ratio of the transmitter combiner

Alarm code: 0x1300

Alarm content: Minor alarm of standing wave ratio of the transmitter combiner

Alarm level: 3

Alarm cause: The combiner external terminal is open circuited or of high impedance, the EAM

receives interference signals or the EAM alarm line is connected improperly.

Influence of the alarm: If the alarm is caused by the open circuit or high impedance of the combiner

external terminal, the power output of the whole cell will be decreased, and the cell coverage will be

affected, but the communication service is not affected temporarily. If the alarm is caused by the

EAM receiving the interference signals, no influence will result.


Handling process:


2. Check whether the alarm line of the backplane EAM is connected improperly. If the alarm

happens together with the “major alarm of the transmitter combiner standing wave ratio”, maybe

there is something wrong with the backplane alarm line.

3. If the alarm indicator on the panel lights simultaneously, it is necessary to check whether the

connectors of the jumper cable on the cabinet top, main feeder and antenna are poorly contacted or

there is water leakage.

4. If none of the above measures works, contact the regional office of ZTE Corporation.


-66-


2.5Level 4 alarm

2.5.1Digital processor fault in the transceiver

2.5.1.1Initialization failure of digital processor 0 in the transceiver

Alarm code: 0xA04

Alarm content: DSP0 initialization fails.

Alarm level: 4

Alarm cause: DSP software or hardware error.

Influence of the alarm: If the TRU of the DSP0 is BCCH carrier, this cell will not work normally; if

it is not BCCH, two physical channels of the TRU will fail to work while others can.

Time limit of handling: If the alarm influences the BCCH carrier, handle it at once; if it just

influences the TCH carrier, handle it as soon as possible, otherwise the traffic capacity of this cell

will be affected.

Handling process:

1. Re-download the DSP software.

2. Reset this TRU frame and restart the DSP unit to see whether this alarm can be recovered. If the

alarm is recovered, it means that the DSP initialization failure is caused by the external strong

interference, and this TRU unit can work normally.


possible.



Alarm code: 0xA05


Alarm level: 4



-67-

Influence of the alarm: Two timeslots of this TRU cannot work normally, that is, two physical

channels of this TRU can not be used, which will affect the traffic capacity of the cell.


Handling process:






possible.



Alarm code: 0xA05


Alarm level: 4





Handling process:






possible.

-68-




Alarm code: 0xA07


Alarm level: 4





Handling process:






possible.


2.5.1.5Software overflow of digital processing unit 0 in the transceiver

Alarm code: 0xA10

Alarm content: WatchDog of DSP0 overflows.

Alarm level: 4

Alarm cause: The DSP0 program of the channel processing unit runs out of service.

Influence of the alarm: The DSP0 program of the channel processing unit runs out of service, and the

control unit once again implements program loading and initialization to the DSP. If the alarm

cannot be recovered, it indicates that the DSP loading never succeeds. This fault may cause


-69-

abnormal work of two channels of a carrier unit. If it is a BCCH carrier, the whole cell will fail to

work normally.


Handling process:

1. Reset the carrier unit first to see whether this alarm can be recovered. If this alarm can be

recovered, it indicates that this alarm is caused by the abnormal internal status of the DSP, and the

carrier unit can work normally after resetting.

2. If this alarm cannot be recovered after resetting, contact the regional office of ZTE Corporation as

soon as possible.



Alarm code: 0xA11


Alarm level: 4



control unit once again implements program loading and initialization to the DSP. If the alarm


abnormal work of two channels of a carrier unit.


Handling process:


recovered, it indicates this alarm is caused by the abnormal internal status of the DSP, and the carrier

unit can work normally after resetting.


soon as possible.

-70-




Alarm code: 0xA12


Alarm level: 4

Alarm cause: The DSP2 program of the channel processing unit runs out of service


control unit once again implements program reloading and initialization to the DSP. If the alarm




Handling process:



unit can work normally after resetting.


soon as possible.



Alarm code: 0xA13


Alarm level: 4



control unit once again implements program reloading and initialization to the DSP. If the alarm



-71-



Handling process:



unit can work normally after the resetting.


soon as possible.


2.5.2Check error of the uplink data from the RPP to the CHP

2.5.2.1Check error of one channel of the uplink data from the RPP to the CHP (DSP0)

Alarm code: 0xA14

Alarm content: Check error of one channel of the uplink data from the RPP to the CHP (DSP0).

Alarm level: 4

Alarm cause: Slight interference exists on the transmission channel between the RPP and the CHP

(or the lines are poorly contacted).

Influence of the alarm: No obvious influence on the system network running.


Handling process:



3. Check whether the bit switch for the transmission matching impedance on the backplane is set

properly.

4. If none of the above operations works, reset the BTS to see whether the fault will re-occur.

-72-


5. If it is still ineffective, contact the regional office of ZTE Corporation.



Alarm code: 0xA15


Alarm level: 4





Handling process:


2. Check whether the backplane gets loose.


properly.





Alarm code: 0xA16


Alarm level: 4




-73-



Handling process:




properly.





Alarm code: 0xA17


Alarm level: 4





Handling process:




properly.


-74-




2.5.3Cross-threshold of the flash memory programming times in the frame

unit controller

Alarm code: 0xA19

Alarm content: Cross-threshold of the FLASH MEMORY programming times in the FUC.

Alarm level: 4

Alarm cause: Too many times of the FLASH MEMORY programming or hardware error.

Influence of the alarm: The baseband processing unit may fail to operate FLASH or the stored

software and data is lost.


Handling flow: Replace the equipment. As the FLASH programming threshold is set as 10,000

times, while the maximum of the FLASH programming times is up to 100,000, generally such alarm

seldom occurs.


2.5.4Channel parameter configuration error

2.5.4.1Channel 0 parameter configuration error

Alarm code: 0xA1A

Alarm content: The Ch0 parameter configuration error

Alarm level: 4

Alarm cause: The parameter configuration is improper or with conflicts.


synchronizing the data, and only the valid data can be synchronized, so such alarm seldom occurs..

This alarm will affect the channel assignment and normal work.



-75-

Handling process: Re-configure the parameters on the background and make the parameter

synchronized with the BS.



Alarm code: 0xA1B


Alarm level: 4



synchronizing the data, and only the valid data can be synchronized, so such alarm seldom occurs.



Handling process: Re-configure the parameters on the background and make the parameters




Alarm code: 0xA1C


Alarm level: 4







-76-





Alarm code: 0xA1D


Alarm level: 4










Alarm code: 0xA1E


Alarm level: 4









-77-



Alarm code: 0xA1F


Alarm level: 4

Influence of the alarm: It will influence the channel assignment and normal work.










Alarm code: 0xA20


Alarm level: 4








-78-




Alarm code: 0xA21


Alarm level: 4









2.5.5Out-of-lock of receiving RF self oscillator

2.5.5.1Out-of-lock of receiving RF self oscillator 1

Alarm code: 0xB02

Alarm content: Out-of-lock of receiving RF self oscillator 1

Alarm level: 4

Alarm cause: The clock signals are not stable or the TRU phrase-locked loop is faulty

Influence of the alarm: This TRU may not be available for conversation.





-79-

2.5.5.2Out-of-lock of receiving RF self oscillator 2

Alarm code: 0xB03

Alarm content: Out-of-lock of receiving RF self oscillator 2

Alarm level: 4

Alarm cause: The clock signals are not stable or the TRU phrase-locked loop is faulty





2.5.5.3Out-of-lock of receiving IF self oscillator 6

Alarm code: 0xB07

Alarm content: Out-of-lock of receiving IF self oscillator 6

Alarm level: 4

Alarm cause: Unstable clock signal or TRU phrase-locked loop fault





2.5.6Alarm for out-of-lock of the phase-locked loop of the BS CKU

Alarm code: 0xC08

Alarm content: Alarm for out-of-lock of the CKU phase-locked loop

Alarm level: 4

-80-


Alarm cause: This alarm occurs only in the condition of the whole network synchronization, it may

be caused by the unstable CKU clock source or the CKU phase-locked loop fault.

Influence of the alarm: Basically this BS can work normally, while the slide code alarm and out-of-

frame alarm may occur.

Time limit of handling: Put it off.

Handling process:

1. Maybe the current 8K clock jitters quite sharply, observe for a certain period of time. If the out-of-

lock alarm occurs repeatedly for one day, replace the board.

2. If all the boards give alarms, it indicates a poor line, switch over to the free-oscillation mode.



2.5.7No response of layer-3 software

2.5.7.1No response of layer-3 software of the BS CKU

Alarm code: 0xC0D

Alarming content: The CKU layer-3 software gives no response temporarily.

Alarm level: 4

Alarm cause: The OMU cannot receive CKU L3 messages in a certain period of time.

Influence of the alarm: This BS can work normally but is unable to be maintained and monitored.


Handling process:

1. Wait for 10 minutes to see whether the alarm is recovered.

2. If not, change the alarming board as a standby board and reset the CKU.

3. If the alarm still exists after resetting, replace the board.



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2.5.7.2No response of layer-3 software of the BS BIE

Alarm code: 0xD15

Alarming content: The layer-3 software of the BIE gives no response temporarily.

Alarm level: 4

Alarm cause: The OMU cannot receive the BIE L3 messages in a certain period of time.

Influence of the alarm: The OMU fails to monitor the BIE running temporarily, but the system

service running will not be influenced.


Handling process:

1. Wait for 10 minutes to see whether the fault is cleared.


3. If the alarm still exists, it indicates the system clock may be abnormal, then reset the CKU.



2.5.7.3No response of the layer-3 software of the carrier unit (CU)

Alarm code: 0xB10

Alarming content: The layer-3 software of the CU gives no response temporarily.

Alarm level: 4

Alarm cause: The OMU cannot receive the CU L3 messages in a certain period of time.

Influence of the alarm: It will affect the maintenance on CU, but with no influence on the phone

calls.

Time limit of handling: No immediate handling is required.

Handling process:

-82-


1. Wait for 10 minutes to see whether the alarm is recovered.

2. Reset the TRU, and view whether the alarm exists.

3. If the alarm still exists after resetting, contact the regional office of ZTE Corporation.


2.5.8Slide code indication of the BIE E1 interface signal

2.5.8.1Forward slide code indication of the BIE E1 interface signal 1

Alarm code: 0xD0B

Alarm content: Forward slide code indication of the BIE E1 interface signal 1

Alarm level: 4

Alarm cause: Chips faulty or clocks abnormal, phase difference from the BSC clock or poor E1

connection

Influence of the alarm: For occasional occurrence, it has little influence on the conversation.

Frequent occurrences (once several minutes) will cause abnormal communication or abnormal link

set-up between the active rack TRU and the BSC.

Time limit of handling: If it occurs occasionally, and the CKU is in the free run mode, this alarm

may not be handled; while for frequent occurrences, handle it as soon as possible.

Handling process:


2. If the alarm still exists, it indicates that the D101 chip on the board may be faulty, replace the

board.

3. If the alarm still exists, it indicates the system clock may be abnormal, reset the CKU.


5. If the physical link of the E1 A interface is normal, while the alarm still exists, contact the regional




-83-


Alarm code: 0xD0C


Alarm level: 4


connection



set-up between the extension rack TRU and the BSC.



Handling process:



board.



5. If the physical link of the E1 B interface is normal, while the alarm still exists, contact the regional




Alarm code: 0xD0D


Alarm level: 4


-84-


connection



set-up between the cascaded rack TRU and the BSC.



Handling process:



board.



5. If the physical link of the E1 C interface is normal, while the alarm still exists, contact the regional



2.5.8.4Backward slide code indication of the BIE E1 interface signal 1

Alarm code: 0xD0E

Alarm content: Backward slide code indication of the BIE E1 interface signal 1

Alarm level: 4


connection

Influence of the alarm: For occasional occurrence, it has little influence on the communication.


set-up between the host rack TRU and the BSC.




-85-

Handling process:



board.



5. If the physical link of the E1 A interface is normal, and the alarm still exists, contact the regional




Alarm code: 0xD0F


Alarm level: 4


connection



set-up between the extension rack TRU and the BSC.



Handling process:



board.


-86-



5. If the physical link of the E1 B interface is normal, while the alarm still exists, contact the regional




Alarm code: 0xD10


Alarm level: 4


connection



set-up between the cascaded rack TRU and the BSC.



Handling process:



board.



5. If the physical link of the E1 C interface is normal, while the alarm still exists, contact the regional




-87-

2.5.9BS OMU fault

2.5.9.1Cross-threshold of the flash memory programming times of the BS OMU

Alarm code: 0x1000

Alarm content: Cross-threshold of the OMU FLASH programming times.

Alarm level: 4

Alarm cause: Too many times of FLASH programming, read-write error or the software checksum

error.

Influence of the alarm: No influence on the current work.


Handling process:

1. Reset the OMU first to see whether this alarm can be recovered. If the alarm can be recovered, it

is caused by the external interference which causes the CPU to read the data in the FLASH

MEMORY

2. If resetting cannot recover this alarm, it indicates the board is aging, replace this board.


2.5.9.2Failure of flash memory programming of the BS OMU

Alarm code: 0x1001

Alarm content: The OMU FLASH programming fails.

Alarm level: 4

Alarm cause: Too many times of the FLASH programming or read-write error.

Influence of the alarm: Loading and reading any version fails.


Handling process: Users can not solve such kinds of problems, usually this alarm is caused by

FLASH chip fault. For such faults, contact the regional office of ZTE Corporation.

-88-



2.5.9.3The standby board of the BS OMU not in position

Alarm code: 0x1004

Alarm content: The OMU standby board is off position.

Alarm level: 4

Alarm cause: The OMU standby board is not powered on or communication with the active board is

improper.

Influence of the alarm: Hand-over to the standby board fails when the active board is faulty, thus

reducing the system reliability.


Handling process:

1. Check whether the standby board is on the rack, then reset or re-insert it (when the standby board

is in the normal status, the power indicator and running indicator are normally on)

2. If there is no standby board on the rack, add an OMU board.


2.5.10Minor alarm of PA over-temperature

Alarm code: 0x1104

Alarm content: Minor alarm of PA over-temperature (>=75ºC)

Alarm level: 4

Alarm cause: PA temperature is too high, which may result from its long-time full-power operation,

with the fan long-time switched off, high temperature of the environment and the detecting circuit

fault.

Influence of the alarm: This TRU can work, but the PA is aging rapidly.



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Handling process:

1. Check whether the fans work normally and whether the temperature of the environment is too

high.

2. If the fans work normally and the environment temperature is normal, while the PA over-

temperature alarm still exists, maybe the detecting circuit is faulty, replace the PA.


2.5.11Board communication interruption

2.5.11.1Communication interruption of the frame unit

Alarm code: 0x1705

Alarm content: The FU communication interruption.

Alarm level: 4

Alarm cause: the HDLC link between the OMU and FU is disconnected.

Influence of the alarm: Fault occurs to FU polling, and no data can be transmitted between the FU

and OMU. The FU data cannot be configured, and the FU status cannot be reported.


Handling process: The system can keep on running, but no data can be configured. If only the FU

link is disconnected for a long time, the user may try the following methods for troubleshooting.

1. Check whether the FU board is inserted properly.

2. Reset the FU board to see whether the alarm is recovered.

3. Check whether the CKU works normally.

4. Check whether the address switch on the backplane is set correctly.

5. Check whether the O&M line of the backplane is properly connected.

6. If the problem still can not be solved, please contact the regional office of ZTE Corporation.


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2.5.11.2Communication link disconnection of the carrier unit (CU)

Alarm code: 0x1706

Alarm content: CU communication link disconnection

Alarm level: 4

Alarm cause: the HDLC link between the OMU and CU is disconnected.

Influence of the alarm: Fault occurs to the CU polling, and no data can be transmitted between the

CU and OMU. The CU data cannot be configured, and the CU status cannot be reported.


Handling process: The system can keep on running, but no data can be configured. If only the CU

link is disconnected for a long time, the user may try the following methods for troubleshooting.

1. Check whether the CU board is inserted properly.

2. Reset the CU board to see whether the alarm is recovered.

3. Check whether the CKU works normally.

4. Check whether the address switch on the backplane is set correctly.

5. Check whether the O&M line of the backplane is properly connected.

6. If the problem still can not be solved, please contact the regional office of ZTE Corporation.


2.5.11.3Communication link disconnection of the power board of the carrier shelf

Alarm code: 0x1709

Alarm content: PSB communication link disconnection.

Alarm level: 4

Alarm cause: EAM power-off, off-line or faulty; OMU power-off, off-line or faulty.

Influence of the alarm: it will influence the PSB operation and maintenance.


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Handling process:

1. Check whether there are alarms and faults in the OMU and EAM. If yes, eliminate the faults

accordingly.

2. If both the OMU and EAM work normally, check whether the alarm line of the backplane is

properly connected. For anything abnormal, correct it.

3. If the fault still exists, replace the board and contact the regional office of ZTE Corporation.


2.5.11.4Communication link disconnection of the PA

Alarm code: 0x170A

Alarm content: Communication link disconnection of the PA.

Alarm level: 4

Alarm cause: The corresponding TRU power-off, off-line or faulty; and OMU power-off, off-line or

faulty.

Influence of the alarm: it will influence the PA operation and maintenance.


Handling process:

1. Check whether there are alarms and faults in the OMU and TRU (especially the CUI)

corresponding to the PA. If yes, eliminate the faults accordingly.

2. If both the OMU and CUI work normally, check whether the O&M line of the backplane is




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2.5.11.5Communication link disconnection of the multi-coupler

Alarm code: 0x170B

Alarm content: MUL communication link disconnection

Alarm level: 4


Influence of the alarm: it only influences the MUL operation and maintenance.


Handling process:


accordingly.





2.5.11.6Communication link disconnection of the combiner

Alarm code: 0x170D

Alarm content: HYCOM communication link disconnection.

Alarm level: 4


Influence of the alarm: it only influences the HYCOM operation and maintenance.


Handling process:


accordingly.


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2.5.12 Boards are unreported till timeout

2.5.12.1 The BS interface board is unreported till timeout

Alarm code: 0x1802

Alarm content: the BIE board is not reported till timeout

Alarm level: 4

Alarm reason: The direct reason is that the BSC side cannot receive O&M messages of the board in

a certain period of time. The possible causes include: the link is blocked while the timer at the BSC

side is set to a relatively short duration (the alarm will be recovered very soon); the BIE

communication link is disconnected.

Influence of the alarm: The alarm condition of the board can not be viewed until the alarm is

recovered.


Handling process:

1. If the alarm is recovered very quickly, improve the quality of the transmission link between the

BSC and BTS, or no handling is required.

2. If the alarm is not recovered for a long time, check step by step according to the “BIE

communication link disconnected” alarm item.

3. Check whether there is an alarm of timeout of the OMU unreported. If yes, handle it first before

handling this alarm.



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2.5.12.2 The BS CKU is unreported till timeout

Alarm code: 0x1803

Alarm content: the CKU is unreported till timeout

Alarm level: 4

Alarm reason: The direct reason is that the BSC side cannot receive O&M messages of the board in

a certain period of time. The possible causes include: the link is blocked and the timer at the BSC

side is set to a relatively short duration (the alarm will be recovered very soon); the CKU



recovered.


Handling process:

1. If the alarm is recovered very quickly, improve the quality of the transmission link between the

BSC and BTS, or no handling is required.

2. If the alarm is not recovered for a long time, check step by step according to the “CKU


3. Check whether there is the alarm of timeout of the OMU unreported. If yes, handle it first before




2.5.12.3 The frame unit is unreported till timeout

Alarm code: 0x1805

Alarm content: the FU board is not reported till timeout

Alarm level: 4

Alarm cause: The direct cause is that the O&M messages of the board can not be received on BSC

side in a certain period of time. Possible causes: the link is blocked and the timer on the BSC side is


-95-

set to a relatively short duration (the alarm will be recovered very soon); FU communication link is

disconnected.


recovered.

Time limit of handling: handle it as soon as possible.

Handling process:

1. If the alarm is recovered very quickly, improve the quality of the transmission link between BSC

and BTS, or no handling is required.

2. If the alarm is not recovered for a long time, check step by step according to the “FU


3. Check whether there is the alarm of timeout of OMU unreported, if yes, handle it first before




2.5.12.4 The carrier unit is unreported till timeout

Alarm code: 0x1806

Alarm content: the CU board is not reported till timeout

Alarm level: 4


side in a certain period of time. The possible causes: the link is blocked and the timer on the BSC

side is set to a relatively short duration (the alarm will be recovered very soon); CU communication

link is disconnected.


recovered.

Time limit of handling: handle it as soon as possible.

Handling process:

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2. If the alarm is not recovered for a long time, check step by step according to the “CU






2.5.12.5 The power board of the public shelf is unreported till timeout

Alarm code: 0x1808

Alarm content: The PSA board is not reported till timeout

Alarm level: 4

Alarm cause: The direct cause is that the O&M messages of the board can not be received on the

BSC side in a certain period of time. The possible causes: the link is blocked and the timer on the

BSC side is set to a relatively short duration (the alarm will be recovered very soon); PSA



recovered.


Handling process:



2. If the alarm is not recovered for a long time, check step by step according to the “PSA





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2.5.12.6 The power board of the carrier shelf power board is unreported till timeout

Alarm code: 0x1809

Alarm content: The PSB board is not reported till timeout

Alarm level: 4



side is set to a relatively short duration (the alarm will be recovered very soon); PSB communication



recovered.


Handling process:



2. If the alarm is not recovered for a long time, check step by step according to the “PSB






2.5.12.7 The power amplifier is unreported till timeout

Alarm code: 0x180A

Alarm content: Timeout of the PA board is not reported

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Alarm level: 4



side is set to a relatively short duration (the alarm will be recovered very soon); PA communication



recovered.


Handling process:



2. If the alarm is not recovered for a long time, check step by step according to the “PA


3.Check whether there is the alarm that OMU is unreported till timeout, if yes, handle it first before

handling this alarm. .



2.5.12.8 The multi-coupler is unreported till timeout

Alarm code: 0x180B

Alarm content: The MUL board is not reported till timeout

Alarm level: 4



side is set to a relatively short duration (the alarm will be recovered very soon); MUL



recovered.


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Handling process:



2. If the alarm is not recovered for a long time, check step by step according to the “MUL






2.5.12.9 The hybrid combiner is unreported till timeout

Alarm code: 0x180D

Alarm content: The HYCOM board is not reported till timeout

Alarm level: 4



side is set to a relatively short duration (the alarm will be recovered very soon); HYCOM



recovered.


Handling process:



2. If the alarm is not recovered for a long time, check step by step according to the “HYCOM


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2.5.1380W PA link alarm

Alarm code: 0x1108

Alarm content: 80W PA link alarm

Alarm level: 4

Alarm cause: In BTS (V1A), 80W PA comprises two 40W PAs in parallel. The alarm is caused by

the communication link disconnection of the additional PA of the 80W PA.

Influence of the alarm: Occurrence of this alarm will cause the actual output power to be much less

than 80W.


Handling process:

1. Check whether the DAAU board works properly.

2. Check whether the PA is in position.



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3 Running Information Processing

3.1Classification of running information

The running information of ZXG10-BTS (V1A) mainly comes from the panel indicators of OMU,

TRU and other modules. Flashing of the indicators means differently, from which the running status

of the equipment can be determined.

1. OMU

There are four indicators on the OMU panel, which, from top downwards, are power supply

indicator, alarm indicator, running indicator, and active/standby indicator. The meanings of the

combination statuses of the panel indicators are shown in Table 3-1.

Table 3-1 Names and meanings of the OMU indicators

Indicated status Power supply

indicator (green)

Alarm

indicator (red)

Running

indicator

(green)

Active/stand

by (yellow)

The board not powered on Normally off Normally off Normally off Normally off

The board powered on Normally on X X X

BOOT starting Normally on Normally off 4 Hz flashing Normally off

Active status Normally on X X Normally on

Standby status Normally on X X Normally off

Process initially started Normally on Normally on Normally on Normally on

Fault of the 4M or 8K

clockNormally on Normally on 1 Hz flashing X

LAPD link disconnected Normally on 1 Hz flashing 1 Hz flashing Normally on

System initialization

statusNormally on 4 Hz flashing 4 Hz flashing Normally on

File downloading Normally on 1 Hz flashing 4 Hz flashing Normally on

Note: X means “the indicator can be in any status”.

2. TRU

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There are five indicators on the TRU board, i.e., power supply indicator, alarm indicator, running

indicator, status indicator ST1 and status indicator ST2 from top downwards. Meanings of

combinations of the panel indicators are shown in Table 3-2.

Table 3-2 Names and meanings of the TRU indicators

Indicated status Power supply

indicator (green)

Alarm

indicator

(red)

Running

indicator

(green)

Status

indicator

ST1

Status

indicator

ST2

The board not powered on Normally off X X X X

The board powered on Normally on X X X X

BOOT starting Normally on Normally

off

4Hz flash X X

Process initially started Normally on Normally

on

Normally on X X

Fault of 4M or 8K clock Normally on Normally

on

1Hz flashing X X

LAPD link disconnected Normally on 1Hz flash 1Hz flashing X X

HDLC link disconnected Normally on 4Hz flash 1Hz flash X X

System initialization status Normally on 4Hz

flashing

4Hz flashing X X

File downloading Normally on 1Hz

flashing

4Hz flashing X X

BCCH TRU (the system

message already received)

X X X Normally

on

X

Note:

1) X means “the indicator can be in any status ”.

2) The priority sequence of the indicators in working status is shown as follows: the priority

gradually decreases from top downwards, i.e., “fault of 4M or 8K clock ----LAPD link

disconnected ----HDLC link disconnected ----file downloading ----system initialization status”

3) ST1: Status indicator 1.If it is normally on, it means that this TRU is the carrier shelf where

the BCCH channel is located. If it is normally off, it means that this TRU is the carrier shelf

where the non-BCCH channel is located.

4) ST2: Status indicator 2.It is reserved in design, and not used in actual running.

Chapter 3 Running Information Processing

-103-

3. BIE

There are four indicators on the BIE panel, i.e., power supply indicator, alarm indicator, running

indicator, and active/standby indicator from top downwards. Meanings of combinations of the panel

indicators are shown in Table 3-3.

Table 3-3 Names and meanings of the BIE indicators

Indicated status Power supply indicator (green)

Alarm indicator

(red)

Running indicator (green)

Active/standby (yellow)

The board not powered on

Normally off Normally off Normally off Normally off

The program out of service

Normally on X Normally on X

HDLC link not established

Normally on 1Hz flashing 1Hz flash X

Working normally Normally on Normally off 1Hz flash X

Active Normally on X X Normally on

Note: X means “the indicator can be in any status.”

4. EBIE

There are four indicators on the EBIE panel, which are, in turn from the top down, power supply

indicator, alarm indicator, running indicator and active/standby indicator. Meanings of combinations

of the panel indicators are shown in Table 3-4

Table 3-4 Names and meanings of the EBIE indicators

Indicated status Power supply indicator (green)

Alarm indicator

(red)

Running indicator (green)


The board not powered on

Normally off Normally off Normally off Normally off

The program out of service

Normally on X Normally on X

8K E1 alarm Normally on Normally on 1Hz flashing X

HDLC link not established

Normally on 4Hz flashing 1Hz flash X

Working normally Normally on Normally off 1Hz flashing X

Active Normally on X X Normally on

Parameter configuration Normally on 4Hz flashing 4Hz flashing X


-104-


5. CKU

There are five indicators on the CKU board, i.e., power supply indicator, alarm indicator, running

indicator, active/standby indicator and phase lock indicator from top downwards. Meanings of

combinations of the panel indicators are shown in Table 3-5.

Table 3-5 Names and meanings of the CKU indicators

Indicated status

Power supply indicator (green)

Alarm indicator

(red)

Running indicator

(green)


Phase lock indicator (green)

The board is not powered

on

Normally off Normally off Normally off Normally off Normally off

Initialization Normally on 4Hz flash X X X

The program runs out of

service

Normally on X Normally on X X

Working normally

Normally on Normally off 1Hz flash X X

Active Normally on X X Normally on X

Phase lock status

Normally on X X X 4Hz flashing

Locked status

Normally on X X X Normally on

The whole network

asynchronous

Normally on X X X Normally off

The clock frame

number abnormal.

Normally on Normally on X X X

HDLC link not

establishedNormally on 1 Hz flashing X X X

The 8K clock

abnormalNormally on X X X

1 Hz flashing

Note: X means “the indicator can be in any status ”.

6. EAM

There are three indicators on the EAM board, i.e., power supply indicator, alarm indicator, and

running indicator from top downwards. Meanings of combinations of the panel indicators are shown

in Table 3-6.


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Table 3-6 Names and meanings of the EAM indicators

Indicated status Power supply indicator

(green)

Alarm indicator (red) Running indicator

(green)

The board not powered on Normally off Normally off Normally off

Initialization Normally on 4Hz flashing X

Working normally Normally on Normally off 1Hz flashing

HDLC link disconnected Normally on 1 Hz flashing 1 Hz flashing

The system clock severely

abnormalNormally on Normally on Normally on


3.2OMU operation information

3.2.1OMU board not powered on

1. Meaning: The OMU board is not powered on

2. Relative information: None.

3. Cause: The OMU board is not powered on.

4. Handling method: Turn on the power switch.

5. Precautions: None.

3.2.2OMU board powered on

1. Meaning: The OMU board is powered on


3. Cause: The OMU board is powered on.

4. Handling method: No handling is required.


3.2.3OMU BOOT starting

1. Meaning: OMU BOOT starting

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3. Cause: When the board is started, BOOT invokes the programs from the FLASH into the memory.



3.2.4OMU in active status

1. Meaning: OMU in active status


3. Cause: OMU is in the active status.



3.2.5OMU in standby status

1. Meaning: OMU in standby status


3. Cause: OMU is in the standby status.



3.2.6OMU procedure initially launched

1. Meaning: OMU process initially started.


3. Cause: The process is started and initializes the parameter variables.




-107-

3.2.7OMU clock fault

1. Meaning: clock fault


3. Cause: clock fault

4. Handling method:

1) Reset the CKU board.

2) If resetting doesn’t work, replace the CKU board.


3.2.8OMU LAPD link disconnected.

1. Meaning: LAPD link is disconnected.


3. Cause: The LAPD link is disconnected.

4. Handling method:

1) Check whether the boards of BSC (such as the LAPD board, the SMB board) work normally,

and whether there is any alarm present. If there are alarms, clear the alarms first.

2) Check whether the LAPD time slots of OMU are allocated correctly.

3) Check whether E1 line is connected through.

4) Check whether the BTS rack is powered on, and whether OMU is started normally.

5) Check whether BIE of BTS works normally. Clear the alarms first if there is any.

6) If none of the above measures works, please contact the regional office of ZTE Corporation.


3.2.9OMU system in the initialization status

1. Meaning: the OMU system is in the initialization status.

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3. Cause: BSC downloads data to OMU, such as the cell attribute, the station configuration, etc.



3.2.10OMU file downloading

1. Meaning: OMU file downloading


3. Cause: Versions of BSC and OMU are inconsistent or OMCR forcefully downloads the software.


5. Precautions: Do not interrupt the download process manually.

3.3TRU operation information

3.3.1TRU board not powered on

1. Meaning: The TRU board is not powered on


3. Cause: The TRU board is not powered on.



3.3.2TRU board powered on

1. Meaning: The OMU board is powered on


3. Cause: The TRU board is powered on.



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3.3.3BOOT starting

1. Meaning: OMU BOOT starting


3. Cause: When the board is started, BOOT invokes the programs from the FLASH into the memory.



3.3.4Process initially started

1. Meaning: OMU process is initially started.


3. Cause: The process is started and initializes the parameter variables.



3.3.5OMU clock fault

1. Meaning: clock fault


3. Cause: clock fault

4. Handling method:

1) Reset the CKU board.

2) If resetting doesn’t work, replace the CKU board.


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3.3.6LAPD link disconnected

1. Meaning: the LAPD link is disconnected.


3. Cause: The LAPD link is disconnected.

4. Handling method:

1) Check whether there is any alarm at the base station BIE, whether E1 line is correctly

connected, and whether there is any alarm on SMB board, LAPD board, DSN board of BSC; if

yes, then locate the fault and eliminate it.

2) Check whether the BSC data are correct, especially the T network connection and SMB time

slot connection data etc.

3) Check whether the backplane line is correctly connected.

4) Reset TRU.



3.3.7TRU HDLC link disconnected

1. Meaning: The HDLC link between TRU and OMU is disconnected.


3. Cause: The HDLC link between TRU and OMU is disconnected.

4. Handling method: The system can keep on running, but no data configuration can be made. If

TRU link is disconnected for a long time, the user may try the following methods for

troubleshooting.

1) Check whether the TRU board is inserted properly.

2) Reset the TRU board to see whether the alarm is recovered.

3) Check whether the clock board works normally.


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4) Check whether the address switch on the backplane is set correctly.

5) Check whether the O&M line of the backplane is correctly connected.



3.3.8TRU system in the initialization status

1. Meaning: TRU system is in the initialization status.


3. Cause: BSC downloads data to TRU, such as the cell attribute, the station configuration, etc.



3.3.9TRU file downloading

1. Meaning: TRU file downloading


3. Cause: Versions of BSC and TRU are inconsistent or OMCR forcefully downloads the software.


5. Precautions: Do not interrupt the downloading process manually.

3.3.10TRU BCCH carrier indication

1. Meaning: The TRU is the carrier shelf where BCCH channel is located.


3. Cause: The TRU is the frame where BCCH channel is located, and BSC has delivered the system

message to this TRU.



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3.4BIE running information

3.4.1BIE board not powered on

1. Meaning: The BIE board is not powered on


3. Cause: The BIE board is not powered on.



3.4.2BIE program out of service

1. Meaning: BIE program runs out of service


3. Cause: Abnormal program and board fault.

4. Handling method: Reset manually or replace the BIE board.


3.4.3BIE HDLC link not established

1. Meaning: The HDLC link between BIE and OMU is disconnected.


3. Cause: The HDLC link between BIE and OMU is disconnected.

4. Handling method: The system can keep on running, but no data configuration can be made. If the

TRU link is disconnected for a long time, the user may try the following methods for

troubleshooting.

1) Check whether the BIE board is inserted properly.

2) Reset the BIE board to see whether the alarm is recovered.



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3.4.4BIE working normally

1. Meaning: BIE works normally


3. Cause: BIE works normally.



3.4.5BIE in the active status

1. Meaning: OMU in the active status


3. Cause: BIE is in the active status.



3.5EBIE running information

3.5.1EBIE board not powered on

1. Meaning: The EBIE board is not powered on


3. Cause: The EBIE board is not powered on.



-114-


3.5.2EBIE program out of service

1. Meaning: The EBIE program runs out of service


3. Cause: Abnormal program and board fault.

4. Handling method: Reset manually or replace BIE board.


3.5.3EBIE 8K and E1 alarm

1. Meaning: There is some problem with the E1 signal or the rack clock signal from BSC.


3. Cause: There is some problem with the E1 signal or the rack clock signal from BSC.

4. Handling method:

1) Check whether the EBIE board and the CKU board are inserted properly.

2) Check whether the E1 line is connected properly.

3) Power off the public shelf, then power on it again.

4) If the whole rack has clock alarms, then replace the CKU board.

5) Replace the EBIE board.

6) If none of the above measures works, please check whether the transmission is normal.


3.5.4EBIE HDLC link not established

1. Meaning: The HDLC link between EBIE and OMU is disconnected.


3. Cause: The HDLC link between EBIE and OMU is disconnected.


-115-

4. Handling method: The system can keep on running, but no data configuration can be made. If

EBIE link is disconnected for a long time, the user may try the following methods for

troubleshooting.

1) Check whether the EBIE board is inserted properly.

2) Reset the EBIE board to see whether the alarm is recovered.




3.5.5EBIE working normally

1. Meaning: EBIE works normally


3. Cause: EBIE works normally.



3.5.6EBIE in active status

1. Meaning: EBIE is in the active status


3. Cause: EBIE is in the active status.



3.5.7EBIE parameter configuration

1. Meaning: EBIE parameter configuration


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3. Cause: OMU configures the connection of EBIE.



3.6CKU running information

3.6.1CKU board not powered on

1. Meaning: The CKU board is not powered on


3. Cause: The CKU board is not powered on.



3.6.2CKU initialization

1. Meaning: CKU initialization.


3. Cause: The board hardware and software are initialized.



3.6.3CKU program out of service

1. Meaning: CKU program out of service


3. Cause: Abnormal program or board fault.

4. Handling method: Reset manually or replace the CKU board.



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3.6.4CKU working normally

1. Meaning: CKU works normally


3. Cause: CKU works normally.



3.6.5CKU in the active status

1. Meaning: CKU is in the active status


3. Cause: CKU is in the active status.



3.6.6CKU in the phase lock status

1. Meaning: CKU is in phase lock status


3. Cause: When the system configuration parameter is “external synchronization mode”, the clock

signals of CKU and E1 are in the synchronization status.

4. Handling method: Reset manually or replace the CKU board.

5. Precautions: The procedure of power-on and phase lock may take about 10 minutes.

3.6.7CKU in the locked status

1. Meaning: CKU is in the locked status


3. Cause: When the system configuration parameter is “external synchronization mode”, the clock

-118-


signals of CKU and E1 are in the synchronization status.



3.6.8Asynchronization of the whole CKU network

1. Meaning: The whole CKU network is asynchronous.


3. Cause: When the system configuration parameter is “internal synchronization mode”, CKU is in

the free-run mode.

4. Handling method: Re-calibrate after a period of time.


3.6.9The CKU clock frame number abnormal

1. Meaning: There is some problem with the rack clock or the TDMA frame number.


3. Cause: There is some problem with the rack clock or the TDMA frame number.

4. Handling method:

1) Insert the CKU properly.

2) Replace the CKU


3.6.10CKU HDLC link not established

1. Meaning: The HDLC link to OMU is not established.


3. Cause: The HDLC link to OMU is not established.

4. Handling method:


-119-

1) The disconnection of LAPD of OMU is a normal case. Handle the problem of the LAPD link

of OMU first in this case.

2) If links are established for all other MOs inside the rack, then replace the CKU board.


3.6.11The CKU 8K clock abnormal

1. Meaning: There are no 8K signals.


3. Cause: There are no 8K signals.

4. Handling method: Check the E1 connection line, the EBIE board and the CKU board.


3.7EAM running information

3.7.1EAM board not powered on

1. Meaning: The EAM board is not powered on


3. Cause: The EAM board is not powered on.



3.7.2EAM initialization

1. Meaning: EAM initialization.


3. Cause: The board hardware and software are initialized.



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3.7.3EAM working normally

1. Meaning: EAM works normally


3. Cause: EAM works normally.



3.7.4EAM HDLC link disconnected

1. Meaning: The HDLC link to OMU is not established.


3. Cause: The HDLC link to OMU is not established.

4. Handling method:

1) The disconnection of LAPD of OMU is a normal case. Handle the problem of the LAPD link

of OMU first in this case.

2) If links are established for all other MOs inside the rack, then replace the EAM board.


3.7.5The EAM system clock severely abnormal

1. Meaning: There are no system clocks.


3. Cause: There are no system clocks.

4. Handling method:

1) Check the CKU board.

2) Check the EAM board (if other boards on the rack have no clock alarms, replace the EAM

board).


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Appendix A Replacement of Boards and Parts

A.1 Overview

In the course of daily maintenance, replacing the faulty board is a frequently used and critical

maintenance method. It is suggested that, when replacing a board, the maintenance personnel of the

equipment room must contact relative technical personnel or the personnel in the regional office of

ZTE Corporation for technical support and instruction.

In the course of replacing the board, attentions should be given to the following principles.

1. The spare parts should be kept in anti-static packing bags (in which small bags of moisture

absorbents are recommended), which are stored in cartons properly according to different types. The

anti-static bags or cartons should be labeled of the types for easy identification.

2. Before replacing, carefully check whether there is any damage to the spare parts or whether there

is any component missing, and make sure the spare board type is completely identical with the type

of the faulty board to be replaced

3. Put on anti-static wrist straps when plugging/unplugging boards. When holding a board with your

hands, never touch the circuit, components and devices or wiring slots on the board. Never use

excessive force in plugging/unplugging, for fear of damaging the pins or slots on the boards or the

backplane.

4. The replaced faulty board should be put into anti-static bags, and stored properly according to

different types.

5. After unplugging the faulty board, install a standard filler panel in the vacant slot to prevent dust

and for decoration, if no spare parts are available then.

6. When replacing an active board, switch over the active/standby boards first to turn the standby

board into the active status.

7. When replacing PA or HYCOM, please make sure to pull out the input cable of the module before

pulling out its output cable. On the contrary, connect the output cable first before connecting the

input cable, so as to avoid no output connection when there input into PA or HYCOM.

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8. Make sure to insert the module in position, and tighten the panel screws of the module.

9. For replacing the power board and MP, plugging/unplugging with power-on is strictly prohibited.

A.2 Replacement of the public shelf board

Replace the public shelf board in the following steps:

1. Preparations for the replacement

1) Determine that the board is faulty and needs a replacement through fault observation and

analysis.

2) Make sure that the spare part functions perfectly and with the identical type of the faulty

board.

3) Prepare some anti-static bags, small bags of moisture absorbents, cartons for different types

as well as some labels for making marks.

2. Replacement steps:

1) Put on the anti-static wrist strap.

2) When replacing an active board, switch over the active/standby boards first to turn the

standby board into the active status.

3) Loosen the retaining screws on the panel, then pull the spanner on the faulty board outwards

and downwards with a proper force of one hand. When the board is separated from the slot and

bounces out of it, pull the board out gently with the other hand holding the bottom of the board.

In the course, try your best to avoid touching the components and circuits on the board with

your hands.

4) Put the replaced faulty board into an anti-static bag containing small bags of moisture

absorbents, paste on the bag the label of the board model, the program version and such word as

“faulty”. Store the faulty boards properly in the cartons according to different types. The

cartons should also be pasted with corresponding labels on the exterior for later identification

and handling.

5) Insert the spare board into the specified slot of the plug-in frame in accordance with its

name. Press the spanner on the board with the thumb and push in the board with proper force

until the spanner is locked, indicating that the board is placed in position. Then tighten the

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screws on the panel.

6) If an active board is replaced, switch over the active/standby boards once again after the

replacement so as to turn the new board into the active status.

3. Confirm after the replacement

When the board is just plugged in, it will take some time for self-test. If the self-test is successful,

the indicator will display normally and the service is resumed, indicating successful replacement.

Refer to Chapter 3 in this manual for the judgement method of the indicator status display. If the

self-test fails, i.e., the self-test is repeated endlessly or the final display is abnormal, and the service

of the relative unit is not resumed, it indicates unsuccessful replacement. Then please check and

determine once again whether the spare part is damaged, or the cause of the fault does not lie in this

board, then locate the fault through observing the alarms in LMT.

A.3 Replacement of the carrier shelf board

Replace the carrier shelf board in the following steps:

1. Preparations for the replacement

1) Make sure that the board is faulty and needs replacing through fault observation and analysis.

2) Make sure that the spare part functions perfectly with the identical type of the faulty board.

3) Prepare anti-static bags, small bags of moisture absorbents, cartons for different types as well

as some labels for making marks.

2. Replacement steps:

1) Put on the anti-static wrist strap.

2) Switch off the PSB power supply of this layer.

3) Loosen the retaining screws on the panel, then pull the spanner on the faulty board outwards

and downwards with a proper force of one hand. When the board is separated from the slot and

bounces out of it, pull the board out gently with the other hand holding the bottom of the board.

In the course, try your best to avoid touching the components and circuits on the board with

your hands.

4) Put the replaced faulty board into an anti-static bag containing small bags of moisture

absorbents, paste on it a label of the board model, the program version and such word as

Appendix A Replacement of Boards and Parts

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“faulty”. Store the faulty boards properly in the cartons according to different types. The

cartons should also be labeled on the exterior for later identification and handling.

5) Insert the spare board into the specified slot of the plug-in frame in accordance with its

name. Press the spanner on the board with the thumb and push in the board with proper force

until the spanner is locked, indicating that the board is placed in position. Then tighten the

screws on the panel.

6) Switch on the PSB power supply of this layer.

3. Confirm after the replacement

When the board is just plugged, it will take some for self-test. If the self-test is successful, the

indicator will display normally and the service is resumed, indicating successful replacement. Refer

to Chapter 3 in this manual for the judgment method of the indicator status display. If the self-test

fails, i.e., the self-test is repeated endlessly or the final display is abnormal, and the service of the

relative unit is not resumed, it indicates unsuccessful replacement. Then please check and determine

once again whether the spare part is damaged, or the cause of the fault does not lie in this board, then

locate the fault through observing the alarms in LMT.

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Appendix B Abbreviations

Abbr. English name

Abis Interface between BSC and BTS

ARFCN Absolute Radio Frequency Channel No

BCCH Broadcast Control Channel

BIE Base Station Interface Equipment

BER Bit Error Rate

BSC Base Station Controller

BSIC Base Station Identify Code

BTS Base Transceiver Station

CCCH Calling Control Channel

CELL Cellular

CHP Channel Processor

CKU Clock Unit

CU Carrier Unit

DAAU Alarm adaptor unit

DTX Discontinuous Transmission

E1 PCM 2M data link

EAM External Alarm Module

EBIE Enhanced Base station Interface Equipment

FU Frame Unit

GPRS General Packet Radio Service

HDLC High Speed Data Link Control

HW HighWay

HYM (HYCOM) Hybrid Combiner

LAPD Link Access Procedure D Channel

127

(continued)

Abbr. English name

LAPDm Link Access Procedure Dm (mobile D) Channel

LM Local Manager

LMT Local Manager Terminal

MMI Man-Machine Interface

MO Managed Object

MS Mobile Station

MSC Mobile services Switching Center

MUL Multi Coupler

OMC Operation and Maintenance Center

OMU Operation & Maintenance Unit

PA Power Amplifier

PEU Power Extension unit

PSA Power Supply A

PSB Power Supply B

PUB Public Unit Board

RACH Random Access Channel

SDU Signal Distribute Unit

SITE

TCH/F Traffic Channel (Full rate)

TCH/H Traffic Channel (Half rate)

TEI Terminal Equipment Identifier

TRU Transceiver Unit

TRX Transceivers

Um Wireless Air Interface

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Documents

ZXG10-BTS (V1A) - xa.yimg.comxa.yimg.com/.../name/6568188-ZXG10-BTSV1AMaintenance-Manual.pdf · The reliable running of the ZXG10-BSS on the network is closely related to correct