Abis Crossed Pair Diagnosis(GBSS16.0_01).pdf

GSM BSS GBSS16.0

Abis Crossed Pair Diagnosis Feature Parameter Description Issue

01

Date

2014-04-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2014. 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 01 (2014-04-30)

Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

i

GSM BSS Abis Crossed Pair Diagnosis Feature Parameter Description

Contents

Contents 1 About This Document..................................................................................................................1 1.1 Scope..............................................................................................................................................................................1 1.2 Intended Audience..........................................................................................................................................................1 1.3 Change History...............................................................................................................................................................1

2 Overview.........................................................................................................................................3 2.1 Introduction....................................................................................................................................................................3 2.2 NEs Supporting the Feature............................................................................................................................................3

3 Technical Description...................................................................................................................4 4 Engineering Guidelines...............................................................................................................6 4.1 When to Use Abis Crossed Pair Diagnosis....................................................................................................................6 4.2 Required Information.....................................................................................................................................................6 4.3 Deployment Procedure...................................................................................................................................................6 4.3.1 Deployment Requirements..........................................................................................................................................6 4.3.2 Activation....................................................................................................................................................................7 4.3.3 Activation Observation................................................................................................................................................8 4.3.4 Deactivation.................................................................................................................................................................8

5 Parameters.....................................................................................................................................10 6 Counters........................................................................................................................................15 7 Glossary.........................................................................................................................................16 8 Reference Documents.................................................................................................................17

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1

1 About This Document

About This Document

1.1 Scope This document describes GBFD-119306 Abis Crossed Pair Diagnosis, including its technical principles and engineering guidelines.

1.2 Intended Audience This document is intended for personnel who: l

Need to understand the features described herein

l

Work with Huawei products

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: l

Feature change Changes in features of a specific product version

l

Editorial change Changes in wording or addition of information that was not described in the earlier version

01 (2014-04-30) This issue does not include any changes.

Draft A (2014-01-23) Compared with Issue 01 (2013-05-06) of GBSS15.0, Draft A (2014-01-23) of GBSS16.0 includes the following changes. Issue 01 (2014-04-30)


1


Issue 01 (2014-04-30)

1 About This Document

Change Type

Change Description

Parameter Change

Feature change

Updated descriptions about the support of batch parameter modification using the CME.

None

Editorial change

None

None


2


2 Overview

2

Overview

2.1 Introduction The Abis Crossed Pair Diagnosis feature enables the BSC to automatically detect transmission cable faults on the Abis interface and to promptly generate alarms for crossed pair connections. This reduces the duration in which transmission faults last and subsequent user complaints.

2.2 NEs Supporting the Feature Table 2-1 NEs supporting the feature Feature

BSC6900

BSC6910

GBTS

eGBTS

Abis Crossed Pair Diagnosis

√

√

√

×

NOTE

√ indicates that the NE supports this feature. × indicates that the NE does not support this feature.

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3

3 Technical Description

Technical Description

The Abis Crossed Pair Diagnosis feature enables the BSC to detect crossed pair connections of E1/T1 cables in Abis over time division multiplexing (TDM) mode. TRANDETSWITCH (BSC6900,BSC6910) controls whether to enable this feature. When services become abnormal because of incorrect cable connections, this feature enables the BSC to quickly identify a transmission exception according to the reported alarm and set this link to the faulty state. In this way, the BSC no longer allocates services to the link. This feature enables the BSC to quickly 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 the 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 crossed pair 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. Issue 01 (2014-04-30)


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3 Technical Description

When detecting a transmission failure of a signaling link, the BSC reports ALM-28006 Radio Signaling Link Disconnected and sets all channels on the transceiver (TRX) that the faulty signaling link serves to the faulty state. If another physical-layer alarm on an E1/T1 link exists, the BSC does not report ALM-28006 Radio Signaling Link Disconnected because it reports only physical-layer alarms.

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4

4 Engineering Guidelines

Engineering Guidelines

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

4.2 Required Information 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.

4.3 Deployment Procedure 4.3.1 Deployment Requirements Table 4-1 Deployment requirements

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Aspect

Requirement

Related features

None

BSC

None Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

6



Aspect

Requirement

BTS

None

GSM networking

The Abis interface uses TDM transmission.

MS

None

MSC

None

License

None

Others

None

4.3.2 Activation Using MML Commands On the BSC LMT, run the MOD BTS command. In this step, set Abis Transmission Cable Detection Switch to ON(On).

MML Command Examples MOD BTS: IDTYPE=BYID, BTSID=0, TRANDETSWITCH=ON;

Using the CME NOTE

When configuring the Abis Crossed Pair Diagnosis feature on the CME, you must perform a single configuration first, and then perform batch modifications if required. You must perform a single configuration for a parameter before batch modifications of the parameter. You are advised to perform batch modifications before logging out of the parameter setting interface.

Step 1 Configure a single object on the CME. (CME single configuration) Set parameters on the CME configuration interface according to the operation sequence described in Table 4-2. For the method of performing the CME single configuration, see CME Single Configuration Operation Guide. Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center) icon on the To modify objects, such as BSCs, BTSs, cells, and TRXs, in batches, click the CME configuration interface to start the batch modification wizard. For the method of performing batch modifications through the CME batch modification center, press F1 on the wizard interface to obtain online help. ----End

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Table 4-2 Configuring parameters on the CME SN

Managed Object (MO)

NE

Parameter Name

Parameter ID

Configura ble in CME Batch Modificati on Center

1

BTS

BSC6900/ BSC6910

Abis Transmissio n Cable Detection Switch

TRANDETS WITCH

Yes

4.3.3 Activation Observation When this feature is enabled, the BSC reports ALM-28006 Radio Signaling Link Disconnected and switches all channels on the TRX to the faulty status after detecting an exception in signaling links.

4.3.4 Deactivation Using MML Commands On the BSC LMT, run the MOD BTS command. In this step, set Abis Transmission Cable Detection Switch to OFF(Off).

MML Command Examples MOD BTS: IDTYPE=BYID, BTSID=0, TRANDETSWITCH=OFF;

Using the CME NOTE

When configuring the Abis Crossed Pair Diagnosis feature on the CME, you must perform a single configuration first, and then perform batch modifications if required. You must perform a single configuration for a parameter before batch modifications of the parameter. You are advised to perform batch modifications before logging out of the parameter setting interface.

Step 1 Configure a single object on the CME. (CME single configuration) Set parameters on the CME configuration interface according to the operation sequence described in Table 4-3. For the method of performing the CME single configuration, see CME Single Configuration Operation Guide. Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center) icon on the To modify objects, such as BSCs, BTSs, cells, and TRXs, in batches, click the CME configuration interface to start the batch modification wizard. For the method of Issue 01 (2014-04-30)


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performing batch modifications through the CME batch modification center, press F1 on the wizard interface to obtain online help. ----End Table 4-3 Configuring parameters on the CME

Issue 01 (2014-04-30)

SN

Managed Object (MO)

NE

Parameter Name

Parameter ID

Configura ble in CME Batch Modificati on Center

1

BTS

BSC6900/ BSC6910

Abis Transmissio n Cable Detection Switch

TRANDETS WITCH

Yes


9


5 Parameters

5

Parameters

Table 5-1 Parameter description Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TRANDETSW ITCH

BSC6900

ADD BTS

GBFD-119306


Meaning:Wheth er to enable the Abis transmission cable detection function. This function is supported only in TDM transmission mode. The working mode of the Abis transmission cable detection function is as follows: For a BTS with multiple E1s/ T1s, the BSC tries to allocate an RSL for each E1/T1 when allocating Abis transmission timeslots for the BTS. In this case, when one E1/T1 is incorrectly connected (such

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MOD BTS


10


Parameter ID

NE

MML Command

5 Parameters

Feature ID

Feature Name

Description as crossed connection), the timeslots carrying some RSLs on the E1/ T1 cannot be interconnected to timeslots at the peer end. As a result, these RSLs are faulty. This helps maintenance engineers to locate problems in a timely manner. If this function is disabled, the BSC may only allocate RSLs for some E1/T1 links when allocating Abis transmission timeslots. Note: To ensure that no extra Abis transmission timeslot is occupied when the Abis transmission cable detection function is enabled, the BSC multiplexes multiple RSLs to a 64 kbit/s timeslot based on the multiplexing mode. If a BTS has only a few TRXs, for example, two E1s and 3 TRXs

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Parameter ID

NE

MML Command

5 Parameters

Feature ID

Feature Name

Description in 4:1 multiplexing mode, the BSC cannot ensure that each E1/T1 is allocated with an RSL. GUI Value Range:OFF (Off), ON(On) Unit:None Actual Value Range:ON, OFF Default Value:ON(On)

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5 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TRANDETSW ITCH

BSC6910

ADD BTS

GBFD-119306


Meaning:Wheth er to enable the Abis transmission cable detection function. This function is supported only in TDM transmission mode. The working mode of the Abis transmission cable detection function is as follows: For a BTS with multiple E1s/ T1s, the BSC tries to allocate an RSL for each E1/T1 when allocating Abis transmission timeslots for the BTS. In this case, when one E1/T1 is incorrectly connected (such as crossed connection), the timeslots carrying some RSLs on the E1/ T1 cannot be interconnected to timeslots at the peer end. As a result, these RSLs are faulty. This helps maintenance engineers to locate problems in a timely manner. If this

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MOD BTS


13


Parameter ID

NE

MML Command

5 Parameters

Feature ID

Feature Name

Description function is disabled, the BSC may only allocate RSLs for some E1/T1 links when allocating Abis transmission timeslots. Note: To ensure that no extra Abis transmission timeslot is occupied when the Abis transmission cable detection function is enabled, the BSC multiplexes multiple RSLs to a 64 kbit/s timeslot based on the multiplexing mode. If a BTS has only a few TRXs, for example, two E1s and 3 TRXs in 4:1 multiplexing mode, the BSC cannot ensure that each E1/T1 is allocated with an RSL. GUI Value Range:OFF (Off), ON(On) Unit:None Actual Value Range:ON, OFF Default Value:ON(On)

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6 Counters

6

Counters

There are no specific counters associated with this feature.

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7 Glossary

7

Glossary

For the acronyms, abbreviations, terms, and definitions, see Glossary.

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8

8 Reference Documents

Reference Documents

There are no specific reference documents associated with this feature.

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Abis Crossed Pair Diagnosis(GBSS16.0_01).pdf

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