tma gsm bts maintenance guide(02)

7/23/2019 TMA GSM BTS Maintenance Guide(02)

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TMA

GSM BTSMaintenance Guide

Issue 02

Date 2013-02-08

HUAWEI TECHNOLOGIES CO., LTD.


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Issue 02 (2013-02-08) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.

i

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 orrepresentations 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 the 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]
http://www.huawei.com/http://www.huawei.com/mailto:[email protected]:[email protected]:[email protected]://www.huawei.com/


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GSM BTS Maintenance Guide About This Document



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About This Document

Overview

TMA (Tower Mounted Amplifier) currently can be divided into DTMA (Dual Tower MountedAmplifier) and MTMA (Multiband Tower Mounted Amplifier). This document describes thesymptoms, causes, and troubleshooting methods of common faults in Huawei TMAs. It

provides guidance for field engineers in rectifying the cause of a fault.

Intended Audience

This document is intended for:

Technical support personnel

Maintenance personnel

Change History02 (2013-02-08)

It is the second official release. Compared with the initial release, Modify the product

description and add that this document can be applicable to the DTMA and MTMA.

01 (2011-12-26)

It is initial release.


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GSM BTS Maintenance Guide Contents



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Contents

About This Document .................................................................................................................... ii

1 General Safety Information ........................................................................................................ 1

2 Maintenance Preparations ........................................................................................................... 3

3 Operation and Maintenance ....................................................................................................... 4

3.1 Troubleshooting ................................................................... ................................................................. ............ 4

3.1.1 TMA Scanning Failure .......................................................... .................................................................. 4

3.1.2 ALD Link Disconnection ................................................................ ........................................................ 5

3.2 Clearing Alarms ...................................................... .................................................................. ....................... 6

3.2.1 TMA Maintenance Link Failure ................................................................. ............................................. 6

3.2.2 TMA Hardware Fault Major Alarm ............................................................................................ ............ 8

3.2.3 TMA Hardware Fault Minor Alarm ...................................................................... ................................ 10

3.2.4 RF Unit TMA Current out of Range Alarm .......................................................... ................................ 11

3.3 Abnormality Operation ................................................................... ................................................................ 13

3.4 Device Replacement ............................................................ ................................................................. .......... 14

A Appendix ..................................................................................................................................... 16

A.1 Acronyms and Abbreviations ............................................. ................................................................. .......... 16


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GSM BTS Maintenance Guide 1 General Safety Information



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1 General Safety InformationThe precautions described in this chapter should be followed when you select the measuring

and testing equipment for installing, operating and maintaining Huawei products andequipment.

Safety Precautions

For the safety of personnel and equipment, comply with the symbols on the equipment and

the safety instructions in this document when installing, operating, and maintaining Huawei

products and equipment.

Indications such as Caution, Warning, and Danger in this document are supplementary

information. They do not contain all the safety precautions for operations.

Local Regulations and Standards

Comply with local safety regulations during the operations. Safety precautions described in

this document are only supplementary to local safety regulations.

General Requirements for Installation

Before installing and maintaining Huawei products, the associated engineers should be trained

in proper operation methods and safety precautions.

Only the qualified engineers are allowed to install, operate, and maintain Huawei

products and equipment. Only the qualified engineers can remove safety devices and maintain the devices.

,

The operation and maintenance personnel should timely report the faults or errors thatmay endanger the safety to the person in charge.

Grounding Requirements

The following requirements are specific to the equipment to be grounded:

Never install the equipment before it is properly grounded. Do not disconnect the ground

cable before the equipment is removed.


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GSM BTS Maintenance Guide 1 General Safety Information



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Never damage the ground conductor.

Never operate the equipment before the ground conductor is installed.

The equipment must be grounded permanently. Before operating the equipment, checkthe electrical connection of the equipment to ensure that the equipment is securely

grounded.

Personal Safety Never operate the equipment or touch the cables in the case of a thunderstorm.

Remove the AC power connector in case of a thunderstorm. Do not use the fixedterminal, or touch the terminal or the antenna connector in such weather conditions.

To avoid electric shocks, never connect the safety extra-low voltage (SELV) circuit to thetelephone-network voltage (TNV) circuit.

Never look at the optical port directly with naked eyes to prevent laser from injuringyour eyes.

Before operating the equipment, wear ESD clothes, ESD gloves, and ESD wrist strap.

Remove conductive objects such as jewelry and watches to avoid electric shocks orburns.

In case of fire, immediately leave the building or the equipment room. Ring the firealarm bell or make an emergency call. Never enter the building on fire.

Equipment Safety Before operation, ensure that the equipment is firmly anchored to the floor or other solid

objects, such as a wall or an installation rack.

Never block the air vent when the system is running.

When installing a front panel, use tools to tighten the screws.

After the installation, remove the packing materials from the equipment area.


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GSM BTS Maintenance Guide 2 Maintenance Preparations



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2 Maintenance PreparationsBefore performing maintenance, you need to know sites well and ensure the maintenancetools are available.

Before configuring, checking, debugging, and maintaining the TMA, maintenance engineers

and technical support should ensure that the tools described inTable 2-1 are available.

Table 2-1List of maintenance tools

Tool Exterior Function

Flat-head screwdriver

(150mm x 6mm)

Fastens and removes screws.

Adjustable wrench

(300 mm x 36 mm)

Fastens or loosens the

hexagon or square bolts/nutsof a proper size. Theopening width of the wrenchis adjustable.

Black PVC insulation tape Insulates the RF connector

of the TMA.

Waterproof tape Waterproofs the RFconnector of the TMA.

Gloves Protect hands.

Safety belt Protects the personnel

working on the tower.


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GSM BTS Maintenance Guide 3 Operation and Maintenance



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3 Operation and Maintenance3.1 Troubleshooting

This chapter describes the symptoms and troubleshooting methods of the following problems:TMA scanning failure, and the ALD link disconnection alarm.

3.1.1 TMA Scanning Failure

Context

The running TMA cannot be scanned. For the symptom, seeTable 3-1.

Table 3-1Symptoms

Symptom Impact on theSystem

Severity Cause

One or more TMAs

cannot be scannedthe whole time.

The TMAs

connected to themain site cannot beidentified, and then

cannot be configuredand managed.

Major A TMA is not installed inthe related sector.

TMA hardware is not

installed properly. Forexample, TMA ANT portsand BTS ports are

reversely connected;

feeders and jumpers areloosely connected; feeder

and jumper connectors aredamaged.

A TMA is faulty.

The power supply switch

of the TMA is not turnedon.

The BTS equipment isfaulty.

Some communication linksare faulty.


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Procedure

Step 1 Run DSP BTSBRDand LST BTSRXUBP, and check the returned information, including thecurrent of the TMA, status of the ALD power supply switch, and parameter settings.

If the current is normal, the power supply switch is turned on, and parameters areconfigured correctly, go to step 2.

Otherwise, run SET BTSRXUBPto turn on the power supply switch, correctly setrelated parameters, and then go to step 2.

Step 2 Run STR BTSALDSCANand check the returned information.

If the TMA is scanned, the procedure ends.

Otherwise, go to step 3.

Step 3 Exchange jumpers with the closest normal sector, scan the TMA again, and check the result.

If an exception is still found in the original sector, the MAFU, RFU, or RRU of the

sector is faulty. If the TMA is scanned after the faulty MAFU, RFU, or RRU is replacedwith a new one, the procedure ends. Otherwise, go to step 4.

If an exception is found in the closest normal sector, the TMA is faulty and needs to bereplaced. In this case, go to step 5.

Step 4 Check the connection of TMA hardware.

If the connection is correct, go to step 6.

Otherwise, reconnect TMA hardware and then go to step 1.

Step 5 Replace the TMA that cannot be scanned. For details, see3.4 Device Replacement.


If all TMAs are scanned, the procedure ends.

If some TMAs still cannot be scanned, contact Huawei technical support personnel.

3.1.2 ALD Link Disconnection

Context

The alarm ALD Link Disconnection is generated when a TMA is added. For the symptom of

this alarm, seeTable 3-2.


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Table 3-2Symptoms


Severity Cause

1. After a TMA isadded, the alarmTMA MaintenanceLink Failure l is

generated on theLMT alarm window.

2. After other MML

commands are run,the ALD LinkDisconnection alarmis generated.

The communicationlink is not set up. Inthis case, the mainbase station cannot

interact with the

standby base station.Therefore, the mainbase station cannotmanage the TMA.

Major

A TMA cannot be scanned.An error of the vendor

code or serial number

occurs after the ADD ALDcommand is run.

The base station sends thescanning command frame

in which the vendor code

and serial number arearranged in the reverseorder. After handling the

frame, the TMA regards

that the frame fails to meetthe requirements, andmakes no response. In thiscase, the base station

regards thatcommunication is faulty.

Procedure


If the TMA is scanned, the procedure ends.

Otherwise, go to 3.1.1 TMA Scanning Failure.

Step 2 Run RMV BTSTMAto delete the TMA.

Step 3 Run ADD BTSTMAto add the TMA.

Step 4 For any exception, contact Huawei technical support personnel.

3.2 Clearing Alarms

This section describes how to clear the alarms TMA Maintenance Link Failure, TMA Fault

and RF Unit TMA Current Out of Range Alarm which are generated during TMA application.These alarms can be classified into major alarms and minor alarms.

3.2.1 TMA Maintenance Link Failure

Context

When the TMA is running, the base station regularly detects the status of the AISG link

between the TMA and the base station. If an error occurs on the AISG link, the TMA

Maintenance Link Failure alarm is generated. For the symptom of this alarm, seeTable 3-3.


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Table 3-3Symptoms


Severity Cause

The TMACommunicationAbnormal alarm isgenerated during

the operation and

maintenance of theTMA.

The TMA cannotbe configured andthe TMA workingmode and gaincannot be queried.

Major

Extra TMAs are configured.The TMA is not installed.

In the unconventionalinstallation scenario, the

vendor code and serial numberof the TMA is not configuredor is configured incorrectly.

The TMA is faulty.

The Power Supply Switchofthe base station is set to OFF.

The cable between the base

station and the TMA is notproperly connected.

The serial number of theadded subunit is incorrect.

The base station is faulty.

When base station resetting,MTMA supporting AISG 1.1link failure.

For the details of the TMA Maintenance Link Failure alarm, seeFigure 3-1.

Figure 3-1TMA Maintenance Link Failure

Procedure

Step 1 Run LST BTSTMA, check whether the TMA is correctly configured.

If yes, go to Step 2.


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If no, go to Step 3.

Step 2 Run DSP BTSBRD, check whether the power switch is turned on.

If yes, go to Step 5.


Step 3 Run STR BTSALDSCAN, modify the configuration information according to scannedresult

If the alarm is cleared, the procedure ends.


Step 4 Run SET BTSRXUBP to turn on the power switches.



Step 5 Check whether the TMA is MTMA which supports AISG 1.1, and whether the BTS has donea reset operation.

If yes, go to Step 6

If no, contact Huawei technical support personnel.

Step 6 Run RMV BTSTMAto delete the TMA, run ADD BTSTMAto add the TMA again, andcheck whether the alarm is cleared.

If yes, the procedure ends.

If no, contact Huawei technical support personnel..

3.2.2 TMA Hardware Fault Major AlarmContext

In application, the TMA continuously detects the current of the low noise amplifier (LNA). If

a severity fault occurring to the LNA, the LNA is switched to BYPASSmode, and the TMAreports a major alarm to the base station by the Antenna Interface Standards Group (AISG)

protocol. For the symptom of this major alarm, seeTable 3-4.

Table 3-4Symptoms

Symptom Impact on the

System

Severity Cause

The alarm TMA

Hardware Fault is

generated during theTMA operation andmaintenance. The

main base station

determines whetherto clear this alarmaccording to the

actual linkrequirements.

When this alarm is

generated, the LNA

is not running andthe TMAautomatically

switches to the

BYPASS mode.Therefore, thecommunication link

of the TMA is notaffected.

Major The LNA is

unavailable due to a

major faultoccurring to theLNA.


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For the alarm TMA Hardware Fault, seeFigure 3-2.

Figure 3-2TMA Hardware Fault Major alarm

Procedure

Step 1 Run RST BTSALDand check whether the alarm is cleared in the alarm window in fiveminutes.


If no, go to step 2.

Step 1 Run MOD BTSTMASUBUNITand set the operating mode of the TMA to NORMAL.Step 2 Run DSP BTSTMASUBUNITto check the operating mode of the TMA.

If the operating mode is NORMALand the alarm is cleared, the procedure ends.

If the operating mode is BYPASSand the alarm is not cleared, go to step 4.

Step 3 Run SET BTSRXUBP, disconnect the power supply to the TMA, and then connect the powersupply.


If the alarm is not cleared, go to step 2.

Step 4 Run RMV BTSTMAto delete the TMA, run ADD BTSTMAto add the TMA again, andcheck whether the alarm is cleared in 5 minutes.


If no, replace the TMA by referring to3.4 Device Replacement,and contact Huaweitechnical support personnel.


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3.2.3 TMA Hardware Fault Minor Alarm

Context

In application, the TMA continuously detects the current of the LNA. If a minor faultoccurring to the LNA, the TMA reports the minor alarm to the base station by the AISGprotocol. For the symptom of this minor alarm, seeTable 3-5.

Table 3-5Symptoms


Severity Cause

The alarm TMA

hardware Fault is

generated during the

OM of the TMA.This is a minoralarm.

When this alarm is

generated, the LNA

is not running and

the TMA does notautomaticallyswitches to theBYPASS mode.

Therefore, the

communication linkof the TMA is notaffected.

Minor The LNA with a

minor fault can runnormally.

For the alarm TMA Fault, seeFigure 3-3.

Figure 3-3TMA Hardware Fault Minor alarm

Procedure

Step 1 Run RST BTSALDand check whether the alarm is cleared in the alarm window in fiveminutes.


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Step 2 Run MOD BTSTMASUBUNITand set the operating mode of the TMA to NORMAL.

Step 3 Run DSP BTSTMASUBUNITto check the operating mode of the TMA.

If the operating mode is NORMALand the alarm is cleared, the procedure ends.

If the operating mode is BYPASSand the alarm is not cleared, go to step 4.

Step 4 RunSET BTSRXUBP, disconnect the power supply to the TMA, and then connect the powersupply.



Step 5 Run RMV BTSTMAto delete the TMA, run ADD BTSTMAto add the TMA again, andcheck whether the alarm is cleared in 5 minutes.


If no, replace the TMA by referring to3.4 Device Replacement,and contact Huaweitechnical support personnel.

3.2.4 RF Unit TMA Current out of Range Alarm

Context

When you turn on the switch of the RF unit antenna to configure the TMA, a message is

displayed saying RF Unit TMA Current out of Range. For the symptom of the RF ALD

current alarm, see Table 3-6.


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Table 3-6Symptoms


Severity Cause

1. After you turn onthe switch of the RFunit antenna toconfigure the TMA,

a message is

displayed sayingXX.

2. When you checkthe antenna portdynamic

information and turn

off the switch, the

current is 0.

The RF unit andALD do not workproperly.

Minor

There arelightning rods inantennas, leadingto short circuit or

open circuit. This

leads to opencircuit of the RFunit or

disconnection ofshort-circuitprotection.

TMA operating

currents aregreater than theupper threshold.

Feeders and

jumpers are loose

and feeder andjumper connectorsare abnormal.

Figure 3-4RF Unit TMA Current out of Range Alarm

Procedure

Step 1 Run DSP BTSBRDand LST BTSRXUBPto query the current consumed by the TMA andthe status of the power supply switch of the ALD.

If the current is 0 or the ALD switch is turned off, go to step 2.

If the overcurrent or undercurrent thresholds queried out by running LST ALDPWRSWare much close to the critical threshold, go to step 3.


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Step 2 Run SET BTSRXUBPand reset the power supply switch of the TMA.



Step 3 Run SET BTSRXUBPto set the overcurrent alarm generation threshold to 950 mA,overcurrent alarm clearance threshold to 900 mA, undercurrent alarm generation threshold to30 mA, and undercurrent alarm clearance threshold to 40 mA.



Step 4 Check whether the feeder between the BTS antenna port and TMA is configured with surgeprotection devices.

If yes, go to step 5.


Step 5 Check whether a standing wave alarm is reported.

If yes, go to step 6.


Step 6 Remove the surge protection devices and run SET BTSRXUBPto turn on the switch of theRF unit antenna.



Step 7 Check whether the antenna port and connector are loosened or have water drop and whetherthe feeders are squeezed, bent, or damaged. Secure the connector or replace feeders if any

exception occurs.



Step 8 If the configured gain of the TMA is consistent with the actual gain, contact Huawei technicalsupport for help.

3.3 Abnormality Operation

ContextIn the TMA and RCU daisy chain scenario, after you add TMAs and scan them repeatedly, no

TMA is scanned and a link abnormality alarm is generated. In this case, you can delete allTMAs and add them again.

Procedure

Step 1 Run LST BTSTMAand LST BTSRETto search for devices added to the BTS.

Step 2 Run RMV BTSTMAand RMV BTSRETto delete all added devices.

Step 3 Scan the TMA again and add devices.


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3.4 Device Replacement

This chapter describes the procedure for replacing the TMA.

Before installing the TMA on old sites, check whether there is an SBT in the system link. If an SBT is

in the system link, analyze whether the SBT affects the communication of the TMA. If the SBT affects

the communication, remove the SBT.

Procedure

Step 1 Close all carriers in the sector where the TMA is located. Then, check whether the carriers areblocked. If they are blocked, go to next step.

Step 2 On the LMT, enter theSET BTSRXUBPcommand, set Power Supply Switchto OFF, andthen run the command.

Step 3 Remove black PVC insulation tape and waterproof tape from the TMA.

Step 4 Mark the cables connected to the TMA.

Step 5 Remove the connection cable from the TMA. Then, wrap the connector up with tape to keepit clear and dust-free.

Step 6 While holding the TMA with hands, remove the hoop iron using a screwdriver, and thenremove the TMA.

Step 7 Install the hoop iron and the TMA.

For the installation of the TMA, see the related TMA Installation Guide.

Step 8 Connect the cable and fasten it using a wrench.

Step 9 Wrap the connector with waterproof tape and black PVC insulation tape.

Step 10 Open all the carriers of the RF unit where the TMA is located.

Step 11 Configure the TMA through the LMT.
http://172.121.139.201/interface201172918950/GO/cn/help/mbsc/m-mml/set-btsrxubp.htmlhttp://172.121.139.201/interface201172918950/GO/cn/help/mbsc/m-mml/set-btsrxubp.htmlhttp://172.121.139.201/interface201172918950/GO/cn/help/mbsc/m-mml/set-btsrxubp.htmlhttp://172.121.139.201/interface201172918950/GO/cn/help/mbsc/m-mml/set-btsrxubp.html


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Follow-up Procedure

Check the following items after configuring the TMA:

The TMA is fixed securely.

All alarms are cleared from the Alarm Management System of the LMT or the M2000.


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GSM BTS Maintenance Guide A Appendix

Issue 02 (2013-02-08) Huawei Proprietary and Confidential 16

AAppendixA.1 Acronyms and Abbreviations

Acronym or Abbreviation Full Name

ALD Antenna Line Device

TMA Tower Mounted Amplifier

DTMA Dual Tower Mounted Amplifier

MTMA Multi- Tower Mounted Amplifier

LMT Local Maintenance Terminal

MML Man Machine Language

RCU Remote Control Unit

SASU Same-band Antenna Sharing Unit

RRU Remote Radio Unit

MAFU Multi-Carrier Antenna Filter Unit

tma gsm bts maintenance guide(02)

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