CDMA IP BTS CHM Troubleshooting Guide_R1[1].0

8/9/2019 CDMA IP BTS CHM Troubleshooting Guide_R1[1].0

http://slidepdf.com/reader/full/cdma-ip-bts-chm-troubleshooting-guider110 1/19

CDMA IP BTS CHMTroubleshooting Guide



CDMA IP BTS CHM Troubleshooting Guide Internal Use Only▲

LEGAL INFORMATION

By accepting this certain document of ZTE CORPORATION you agree to the following terms. If you do

not agree to the following terms, please notice that you are not allowed to use this document.

Copyright © 2010 ZTE CORPORATION. Any rights not expressly granted herein are reserved. This

document contains proprietary information of ZTE CORPORATION. Any reproduction, transfer,

distribution, use or disclosure of this document or any portion of this document, in any form by any

means, without the prior written consent of ZTE CORPORATION is prohibited.

and are registered trademarks of ZTE CORPORATION. ZTE’s company name, logo

and product names referenced herein are either trademarks or registered trademarks of ZTECORPORATION. Other product and company names mentioned herein may be trademarks or trade

names of their respective owners. Without the prior written consent of ZTE CORPORATION or the

third party owner thereof, anyone’s access to this document should not be construed as granting, by

implication, estopped or otherwise, any license or right to use any marks appearing in the document.

The design of this product complies with requirements of environmental protection and personal

security. This product shall be stored, used or discarded in accordance with product manual, relevant

contract or laws and regulations in relevant country (countries).

This document is provided “as is” and “as available”. Information contained in this document is subject

to continuous update without further notice due to improvement and update of ZTE CORPORATION’s

products and technologies.

ZTE CORPORATION

Address: NO. 55

Hi-tech Road South

ShenZhen

P.R.China518057

Website: http://dms.zte.com.cn (Technical Support)

Email: [email protected]

ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. I

http://dms.zte.com.cn/

mailto:[email protected]

mailto:[email protected]

http://dms.zte.com.cn/




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 - -

ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. II




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 - -

ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. III




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

ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. IV




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

ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. V




ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. VI

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




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

ZTE Confidential Proprietary © 2010 ZTE CORPORATION. All rights reserved. 1




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.





Figure 2-1 Running Status

2. Check whether the BTS reports one of the following alarms:

41258: 32-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.





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.





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.





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





Figure 2-6 Board Alarm Information





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.





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.





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:



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.





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






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.

Date post:	01-Jun-2018
Category:	Documents
Upload:	prashant-mara
View:	229 times
Download:	0 times

CDMA IP BTS CHM Troubleshooting Guide_R1[1].0

Documents