Abis Crossed Pair Diagnosis(GBSS14.0_02)

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GSM BSS

GBSS14.0

Abis Crossed Pair Diagnosis Feature

Parameter Description

Issue 02

Date 2012-11-07

HUAWEI TECHNOLOGIES CO., LTD.


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Copyright Huawei Technologies Co., Ltd. 2013. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written

consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

The purchased products, services and features are stipulated by the contract made between Huawei and the

customer. All or part of the products, services and features described in this document may not be within the

purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information,and recommendations in this document are provided "AS IS" without warranties, guarantees or representations

of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Issue 02 (2012-11-07) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.

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Contents

1 About This Document..................................................................................................................1

1.1 Scope..................................................................................................................................................................1

1.2 Intended Audience..............................................................................................................................................1

1.3 Change History...................................................................................................................................................1

2 Technical Description...................................................................................................................3

3 Engineering Guidelines...............................................................................................................5

3.1 When to Use Abis Crossed Pair Diagnosis........................................................................................................5

3.2 Information to Be Collected...............................................................................................................................5

3.3 Deployment Procedure.......................................................................................................................................5

4 Parameters.......................................................................................................................................6

5 Counters..........................................................................................................................................7

6 Glossary...........................................................................................................................................8

7 Reference Documents...................................................................................................................9

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1 About This Document

1.1 Scope

This document describes the GBFD-119306 Abis Crossed Pair Diagnosis feature.

1.2 Intended Audience

It is assumed that users of this document are familiar with GSM basics and have a working

knowledge of GSM telecommunication.

This document is intended for:

l Personnel who work with Huawei GSM products

l Personnel who need to understand the Abis Crossed Pair Diagnosis feature

1.3 Change History

This section provides information about the changes in different document versions.

There are two types of changes, which are defined as follows:

lFeature change: refers to a change in the Abis Crossed Pair Diagnosis feature of a specificproduct version.

l Editorial change: refers to a change in wording or the addition of information that was not

described in the earlier version.

Document Issues

The document issue is as follows:

l 02 (2012-11-07)

l 01 (2012-04-28)

l Draft A (2012-02-15)

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02 (2012-11-07)

This is the second commercial release of GBSS14.0.

Compared with issue 01 (2012-04-28) of GBSS14.0, issue 02 (2012-11-07) of GBSS14.0

incorporates the changes described in the following table.

Change Type Change Description Parameter Change

Feature change Added descriptions about

parameters controlling this

feature. Specifically,

modified chapters "2

Technical Description" and

"3 Engineering

Guidelines".

The RSVID and

RSVVALUEparameters

control whether to enable this

feature.

Editorial change None None

01 (2012-04-28)

This is the first release of GBSS14.0.

Compared with issue draft A (2012-02-15) of GBSS14.0, issue 01 (2012-04-28) of GBSS14.0

has no change.

Draft A (2012-02-15)

This is a draft.

Compared with issue 01 (2011-10-30) of GBSS13.0, draft A (2012-02-15) of GBSS14.0 has no

change.

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2 Technical DescriptionThe Abis Crossed Pair Diagnosis feature enables the BSC to detect crossed pair connections of

E1/T1 cables over the Abis interface in TDM transmission mode.

Bit 0 ofRSVVALUEfor which RSVID is set to 1 controls whether to enable this feature. Set

RSVVALUEbased on the current parameter setting. For example, if the current value of

RSVVALUEis 254 (0000 0000 1111 1110 in binary), set this parameter to 255 (0000 0000 1111

1111 in binary) with bit 0 set to 1.

When detecting a crossed pair connection of an E1/T1 cable, the BSC reports an alarm and sets

this link to the faulty state so that services are no longer allocated to the link.

This feature enables the BSC to detect the following crossed pair connections:

l All crossed pair connections between E1/T1 cables that connect ports on the same BTS to

the BSC

l Most of the crossed pair connections between E1/T1 cables that connect different BTSs to

the BSC except in the following scenario: E1/T1 cables connect two ports with the same

port number on two BTSs to the BSC and the two BTSs have the same model and

configuration

With this feature, the timeslot allocation algorithm is adjusted to ensure that each E1/T1 cable

carries at least one signaling link. Then, the BSC determines whether the transmission over an

E1/T1 cable is normal by checking signaling links over this E1/T1 cable.

If the signaling links over the E1/T1 cable can be set up successfully, the transmission over the

E1/T1 cable is normal. If the signaling links over the E1/T1 cable fail to be set up, the

transmission over the E1/T1 cable is faulty, for example, the link connection fails or crossedpair connection exists.

The principle for signaling link detection is as follows: Link Access Procedure on the D channel

(LAPD) is the underlying protocol of signaling links over the Abis interface, and both the BSC

and BTS allocate a Terminal Equipment Identifier (TEI) to each LAPD link. LAPD negotiation

over an LAPD link is successful only when the TEIs allocated by the BSC and the BTS are the

same. A BTS allocates a unique TEI to each LAPD link under the BTS. Therefore, the BSC can

detect all transmission failures of E1/T1 links inside a BTS. There is a probability of about 1/72

for LAPD links between different BTSs and the BSC to have the same TEI. Therefore, the BSC

can detect most transmission failures of E1/T1 links between different BTSs and the BSC.

However, if two BTSs have the same model and configuration, and if two LAPD links are

allocated the same TEI, the BSC cannot detect the crossed pair connection between the two E1/T1 cables carrying the two LAPD links.

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When detecting a transmission failure of a signaling link, the BSC reports an ALM-28006 Radio

Signaling Link Disconnected alarm and sets all channels on the TRX that the faulty signaling

link serves to the faulty state. If another physical-layer alarm has been reported on an E1/T1

link, the ALM-28006 Radio Signaling Link Disconnected alarm will not be reported on this E1

link because this alarm is a child alarm of physical-layer alarms.

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3 Engineering Guidelines

3.1 When to Use Abis Crossed Pair Diagnosis

It is recommended that the Abis Crossed Pair Diagnosis feature be used in Abis over TDM mode.

3.2 Information to Be Collected

Before deploying this feature, collect the following information:

l Status of physical transmission

l Status of E1/T1 ports connected to the BTS

To check the status of the E1/T1 ports, run the DSP E1T1 command. Ensure that physical

transmission and E1/T1 ports are normal to prevent a large number of transmission-related

alarms after this feature takes effect.

If any E1/T1 link is faulty, check whether this link will be used later. If the E1/T1 link will not

be used, run the RMV BTSCONNECT command to remove the link. If the E1/T1 link will be

used and the fault cannot be rectified currently, run the SET BTSFORBIDTS command to

inhibit all timeslots on the E1/T1 link. After the fault in the E1/T1 link is cleared, resume the

timeslots.

3.3 Deployment ProcedureFor details about how to activate, verify, and deactivate this feature, see Configuring Abis

Crossed Pair Diagnosis.

NOTE

If this feature is enabled when multiple E1 links are configured for the BTS and some E1 links are faulty,

exceptions will be detected, and some TRXs will report alarms related to signaling link disconnection.

Therefore, troubleshoot transmission faults before deploying this feature to prevent a large number of

alarms.

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4 ParametersTable 4-1 Parameter description

Parameter ID NE MMLCommand

Feature ID Feature Name Description

RSVID BSC6900 SET BTSRSV GBFD-111202 O&M of BTS Meaning:Index

of a BTS

reserved

parameter.

GUI Value

Range:1~10

Unit:None

Actual ValueRange:1~10

Default

Value:None

RSVVALUE BSC6900 SET BTSRSV GBFD-111202 O&M of BTS Meaning:Value

of a BTS

reserved

parameter.

GUI Value

Range:0~65535

Unit:NoneActual Value

Range:0~65535

Default

Value:None

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5 CountersThere are no specific counters associated with this feature.

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6GlossaryFor the acronyms, abbreviations, terms, and definitions, see the Glossary.

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7 Reference DocumentsNone.

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