Zte ZXG10-BTS User manual

ZXG10-BTS (V1A)
Base Transceiver Station
Maintenance Manual
ZTE Corporation

© ZTE Corporation. 2002, S enz en, P. R. C ina
All rig ts reserved. No part of t is publication may be excerpted,
reproduced, translated, annotated or edited, in any form or by any
means, wit out t e prior written permission of t e copyrig t owner.
ZXG10-BTS (V1A)
Maintenance Manual
* * * *
3/F., A Wing, ZTE Plaza, Hi-Tech Industrial Park, henzhen, P. R. China
Tel: [phone]
Fax: [phone]
Post-code: 518057
* * * *
August, 2002 First Edition, First Print

Preface
ZXG10, a G M mobile communication system independently developed by ZTE Corporation, is
composed of the switching sub-system ZXG10-M and the base station sub-system ZXG10-B .
The ZXG10-B is in charge of providing and managing wireless transmission in G M, and is
composed of the base station controller ZXG10-B C and the base station transceiver ZXG10-BT ,
etc. The reliable running of the ZXG10-B 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-BT (V1A). This manual primarily introduces the daily
maintenance, alarm handling and operation information processing of ZXG10-BT (V1A).
In this Manual, ZXG10-BT (V1A) is abbreviated as BT (V1A) or BT ; ZXG10-BT (V1A) local
management terminal as LMT; ZXG10-B (V1A) as B ; and ZXG10-B C (V1A) as B C (V1A)
or B C.
This Manual includes three chapters: Chapter 1 introduces the routine maintenance and emergent
maintenance of the ZXG10-BT (V1A) as well as frequently used maintenance methods. Chapter 2
introduces the alarm classification of the LMT of ZXG10-BT (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-BT (V1A)
Installation Manual for ZXG10-BT (V1A)
Operation Manual for ZXG10-BT (V1A)
Statement: T e actual product may differ from w at is described in t is manual due to
frequent updates of ZTE products and fast development of tec nologies. Please contact our
local office for updating/upgrading information of t e product.

Contents
1 EQUIPMENT MAINTENANCE .......................................................................................................... 1
1.1 MAINTENANCE DE CRIPTION ....................................................................................................................... 1
1.2 ROUTINE MAINTENANCE ............................................................................................................................. 2
1.2.1 Daily routine maintenance ........................................................................................................... 2
1.2.2 Re ular routine maintenance ....................................................................................................... 4
1.3 EMERGENT MAINTENANCE .......................................................................................................................... 5
1.4 TYPICAL MAINTENANCE METHOD ............................................................................................................... 6
1.5 RELEVANT MAINTENANCE TABLE ................................................................................................................ 7
1.5.1 Routine maintenance and operation record table ....................................................................... 7
1.5.2 Emer ent maintenance and operation record table .................................................................. 10
2 ALARM HANDLING ........................................................................................................................... 11
2.1 ALARM INFORMATION AND CLA IFICATION ................................................................................................. 11
2.2 LEVEL-1 ALARM .................................................................................................................................... 18
2.3 LEVEL- 2 ALARM ................................................................................................................................... 18
2.3.1 Alarm of the main clock si nal of the BS CKU ......................................................................... 18
2.3.2 Software version error of the BIE .............................................................................................. 19
2.3.3 Major alarm of the standin 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 receivin 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 transmittin 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 switchin 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 Di ital 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 pro rammin times in the frame unit controller ............. 75
2.5.4 Channel parameter confi uration error .................................................................................... 75
2.5.5 Out-of-lock of receivin 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 si nal ................................................................. 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 CLA IFICATION 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 startin ................................................................................................................ 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 downloadin ........................................................................................................... 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 startin .......................................................................................................................... 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 downloadin ............................................................................................................... 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 pro ram out of service ...................................................................................................... 113
3.4.3 BIE HDLC link not established ................................................................................................ 113
3.4.4 BIE workin 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 pro ram 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 workin normally ............................................................................................................ 116
3.5.6 EBIE in active status ................................................................................................................ 116
3.5.7 EBIE parameter confi uration ................................................................................................ 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 pro ram out of service .................................................................................................... 117
3.6.4 CKU workin 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 workin 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 HELF BOARD .......................................................................................... 124
A.3 REPLACEMENT OF THE CARRIER HELF BOARD ........................................................................................ 125
APPENDIX B ABBREVIATIONS ....................................................................................................... 127
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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-BT
(V1A), together with the maintenance requirements and recommendations will be described below.
1. Maintenance classification
Daily maintenance of ZXG10-BT (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-BT (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 Qo , 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-BT (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-BT (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 B or the LMT of the BT , 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 B , 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 BT 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-BT (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 ection 3.1 of this Manual.
1.2.2Regular routine maintenance
Regular routine maintenance includes the following items:
1. Checking the BT 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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Maintenance Manual for ZXG10-BT (V1A)

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 BT 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 V WR 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 B .
1.3Emergent maintenance
Emergent maintenance refers to the maintenance task which needs to be handled immediately in
response to the emergent fault of ZXG10-BT (V1A) equipment. Emergent faults are characterized
by abrupt occurrence and serious influence on the Qo , 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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Chapter 1 Equipment MaintenanceAlarm Handling

2) Maintenance measures: When any alarm information is observed from the OMCR of the
B or the LMT system of the BT , 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 B or the LMT system of the BT .
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 BT . 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 BT .
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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Maintenance Manual for ZXG10-BT (V1A)

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. elf-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
uch 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. Relevant maintenance tables
1. .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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Chapter 1 Equipment MaintenanceAlarm Handling

Table 1-1 Daily maintenance record table
Items Operation item Equipment running status and
andling 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
andling result
Operator Remarks
Check the
BT module
Check the BT
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
ystem
Antenna and feeder
system
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Maintenance Manual for ZXG10-BT (V1A)

Table 1-3 Maintenance item periodical summary table
Items Operation item Maintenance
period
Equipment running status
and andling 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
BT module
check
Check the BT
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
ystem
Antenna and
feeder system
Half a year
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Chapter 1 Equipment MaintenanceAlarm Handling

1. .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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Maintenance Manual for ZXG10-BT (V1A)

2 Alarm Handling
2.1Alarm information and classification
The alarm management of the LTM system is an important part of BT local operation and
maintenance. The LMT system, after it is put into operation, can perform centralized monitoring on
the overall running condition of the BT 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), B interface equipment (BIE),
clock unit (CKU), external alarm collection module (EAM), signaling distribution unit ( DU) and
power supply (P A).
2. Boards in the carrier shelf: frame unit (FU), carrier unit (CU), power supply (P B), 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 B The whole B
2 One or some sites B C or a site The whole B The whole B
3 One or some carriers One or some carriers B C or a site B C 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 ection 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 B CKU 2
0xD00 oftware version error of the B 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 (D P0).
3
0xA09 Data check error of both the main-set and sub-set uplink
data from the receiving processor to the channel
processor (D P1).
3
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Maintenance Manual for ZXG10-BT (V1A)