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CDMA IP BTS CHMTroubleshooting Guide
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Revision History
Product Version Document Version Serial Number Reason for Revision
V8.20.04 or higher versions 1.0 - First published
Author
Date Document Version Prepared by Reviewed by Approved by
2010-05-19 1.0 Xiang Yijie - -
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Applicable to : CDMA wireless technical support engineers
Proposal: Before reading this document, you had better have the following knowledge and skills.
SEQ Knowledge and ski lls Reference material
1ZXC10 BSSB Product Skill CertificationLevel II
-
Follow-up document: After reading this document, you may need the following information
SEQ Reference material Information1 - -
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About This Document
Summary
Chapter Description
1 Overview Introduces the organizational structure, acronyms and
abbreviations, and applicable scope of this guide2 Undetected CHM Board Alarm Describes how to troubleshoot an undetected CHM board
alarm
3 CSM6800 Bit Test Failure Alarm Describes how to troubleshoot a CSM6800 bit test failurealarm
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TABLE OF CONTENTS
1 Overview ........................................................................................................... 1
1.1 About This Guide ............................................................................................... 1
1.2 Acronyms and Abbreviations ............................................................................. 1
1.3 Product Versions................................................................................................ 2
2 Undetected CHM Board Alarm ........................................................................ 2
2.1 Symptom Description......................................................................................... 2
2.2 Troubleshooting Procedure................................................................................ 2
2.3 Cause Analysis .................................................................................................. 8
2.3.1
CCM/DSM Problem............................................................................................ 8
2.3.2 Clock Problem.................................................................................................... 8
2.3.3 Configuration Problem ....................................................................................... 9
2.3.4 Board Problem ................................................................................................... 9
2.3.5 Back Board Problem .......................................................................................... 9
2.3.6 Engineering Problem.......................................................................................... 9
3 CSM6800 Bit Test Failure Alarm ................................................................... 10
3.1 Symptom Description....................................................................................... 10
3.2 Troubleshooting Procedure.............................................................................. 10
3.3 Cause Analysis ................................................................................................ 12
3.3.1 Clock Problem.................................................................................................. 12
3.3.2
Board Problem ................................................................................................. 12
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FIGURES
Figure 2-1 Running Status ..................................................................................................... 3
Figure 2-2 GCM Board Check ............................................................................................... 4
Figure 2-3 Version Consistency Check.................................................................................. 4
Figure 2-4 Configuration Consistency Check ........................................................................ 5
Figure 2-5 CHM Board Restart .............................................................................................. 6
Figure 2-6 Board Alarm Information....................................................................................... 7
Figure 2-7 Rack Alarm Information ........................................................................................ 8
Figure 3-1 GCM Board Check ............................................................................................. 11
Figure 3-2 Failure Information.............................................................................................. 11
TABLES
Table 1-1 Acronyms and Abbreviations................................................................................. 1
Table 1-2 Product Versions ................................................................................................... 2
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1 Overview
1.1 About This Guide
This guide is organized in three parts:
The first part introduces the organizational structure, acronyms and abbreviations,
and applicable scope of this guide.
The second part describes how to troubleshoot an undetected CHM board alarm.
The third part describes how to troubleshoot a CSM6800 bit test failure alarm.
It can serve as a reference for quick problem location and failure information feedback.
This guide is intended for the following audience:
CDMA wireless technical support personnel
Operation and maintenance personnel in representative offices
1.2 Acronyms and AbbreviationsTable 1-1 lists the acronyms and abbreviations in this guide.
Table 1-1 Acronyms and Abbreviations
Acronymsand
AbbreviationsFull Name Functions
CHMChannelHandling
Module
The CHM board provides the following functions:
Forward modulation
Backward demodulation
Key CDMA technologies
CCMCommunicationControl Module
The CCM board provides the following functions:
Signaling control
Resource management
Operation & maintenance
DSMData ServiceModule
The DSM board provides the following functionsfor the Abis interface:
Signaling control
Data transfer
Trunk function
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Acronymsand
AbbreviationsFull Name Functions
PP2S and16CHIP
-
The PP2S and 16CHIP are CDMA BSS systemclocks, which are generated by the way ofreceiving satellite signals from the GPS of theBSC or BTS, and using 1PPS as a referencephase lock as well.
1.3 Product Versions
Table 1-2 lists the product versions that are applicable to this guide.
Table 1-2 Product Versions
Product Name Product Versions
CDMA IP BTS (ALL-IP) V8.20.04 or higher versions
2 Undetected CHM Board Alarm
2.1 Symptom Description
The ALL-IP CCM board reports an undetected CHM board alarm.
2.2 Troubleshooti ng Procedure
Take BTSB I4 for example. You can troubleshoot CBTS I2 in a similar way.
To troubleshoot an undetected CHM board alarm, perform the following steps:
1. Check whether the CCM and DSM boards run normally, as shown in Figure 2-1.
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Figure 2-1 Running Status
2. Check whether the BTS reports one of the following alarms:
41258: 32-chip clock alarm
41259: 16-chip clock alarm
41260: PP2S clock alarm
3. If the BTS reports any 32-chip, 16-chip, or PP2S clock alarm, check whether theGCM board is normal, as shown in Figure 2-2.
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Figure 2-2 GCM Board Check
4. Check whether the CHM version is consistent with the released version, as shown
in Figure 2-3.
Figure 2-3 Version Consistency Check
5. Check whether the physically inserted CHM boards are consistent with those
configured in the OMC, as shown in Figure 2-4.
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Figure 2-4 Configuration Consistency Check
6. Power off the CHM board, and then restart/reset it. Check whether the CHM board
is running normally, as shown in Figure 2-5.
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Figure 2-5 CHM Board Restart
7. If this problem still persists, power off the BTS, and then replace the CHM board or
insert the CHM board in a different slot.
8. Return the CHM board to the R&D Dept for performing the following cause analysis
and fault location:
Rack configuration
Version of the CHM board
Power-on notification of the CHM board
Active alarm of the CHM board
Cleared alarm of the CHM board
Cleared alarm of the rack
Diagnosis information of the CCM/DSM board
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Figure 2-6 Board Alarm Information
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Figure 2-7 Rack Alarm Information
2.3 Cause Analysis
2.3.1 CCM/DSM Problem
If the CCM/DSM board is problematic, the OMC reports a link disconnection alarm. In this
case, the OMC cannot detect the CHM board. Therefore, you should verify that the CCM
board, DSM board, and E1 links are normal.
2.3.2 Clock Problem
The CHM board cannot start running until the CSM6800 bit test is passed. The CSM6800
bit test can be passed only when the 32-chip, 16-chip, and PP2S clock are normal. If a
32-chip, 16-chip, or PP2S clock is problematic, the BTS reports either an undetected
CHM board alarm or a CSM6800 bit test failure alarm. When reaching the preset time
interval, the CHM board gets automatically reset. In this case, the CSM6800 bit test
failure alarm disappears; however, the BTS reports the undetected CHM board alarm.
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The BTS repeats the test-failure-alarm cycle. If the BTS reports a 32-chip, 16-chip, or
PP2S clock alarm, you need to check whether the GCM board is problematic or the OMC
can detect the CHM board.
2.3.3 Configuration Problem
The CHM board varies from type to type, from version to version. The physically inserted
boards may be incorrectly configured in the OMC. To avoid an undetected CHM board
problem, ensure that the physically inserted boards are consistent with those configured
in the OMC.
2.3.4 Board Problem
After having been running for a long time, the CHM board may experience one of the
following component failures:
Power supply failure
Crystal oscillator failure
BGA failure
In this case, the CHM board cannot be started, the field engineer cannot identify any
potential cause, and the OMC can neither detect the CHM board nor report any alarm.
Therefore, you need to replace the CHM board with a new one, and then return thereplaced CHM board for repair.
2.3.5 Back Board Problem
If this problem still persists after the CHM board is replaced, check whether the back
CHM board is incorrectly inserted. In this case, you need to replace the back CHM board
or insert the back CHM board in a different slot.
2.3.6 Engineering Problem
If an engineering problem occurs, you need to check whether the cabinet is correctly
grounded or the power supply is reliable.
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3 CSM6800 Bi t Test Failure Alarm
3.1 Symptom Descrip tion
The ALL-IP CCM board reports a CSM6800 bit test failure alarm.
3.2 Troubleshooting Procedure
Take BTSB I4 for example. You can troubleshoot CBTS I2 in a similar way.
To troubleshoot a CSM6800 bit test failure alarm, perform the following steps:
1. Check whether the BTS reports one of the following alarms:
41258: 32-chip clock alarm
41259: 16-chip clock alarm
41260: PP2S clock alarm
2. If the BTS reports a 32-chip, 16-chip, or PP2S clock alarm, check whether the GCM
board is normal, as shown in Figure 3-1.
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Figure 3-1 GCM Board Check
3. Double-click Alarm ID 41531 to obtain the failure information, as shown in Figure
3-2.
Figure 3-2 Failure Information
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4. Report the failure information to the R&D Dept. for cause analysis.
5. Check whether the clocks are normal. If yes, replace the CHM board or insert the
CHM board in a different slot, and then return the replaced CHM board for repair.
3.3 Cause Analysis
3.3.1 Clock Problem
The CHM board cannot start running until the CSM6800 bit test is passed. The CSM6800
bit test can be passed only when the 32-chip, 16-chip, and PP2S clock are normal. If a
32-chip, 16-chip, or PP2S clock is problematic, the BTS reports either an undetected
CHM board alarm or a CSM6800 bit test failure alarm. When reaching the preset timeinterval, the CHM board gets automatically reset. In this case, the CSM6800 bit test
failure alarm disappears; however, the BTS reports the undetected CHM board alarm.
The BTS repeats the test-failure-alarm cycle. If the BTS reports a 32-chip, 16-chip, or
PP2S clock alarm, you need to check whether the GCM board is problematic or the OMC
can detect the CHM board.
3.3.2 Board Problem
After having been running for a long time, the CHM board may experience one of the
following failures:
Crystal oscillator failure
CSM6800 bit test failure
In this case, the CHM board cannot be started, the field engineer cannot identify any
potential cause, and the OMC reports the undetected CHM alarm and CSM6800 bit test
failure alarm. Therefore, you need to replace the CHM board with a new one, and then
return the replaced CHM board for repair.
Recommended