15-routine maintenance instructions.pdf

8/12/2019 15-Routine Maintenance Instructions.pdf

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User ManualM900/M1800 Base Transceiver Station (BTS30) Table of Contents

Table of Contents

Chapter 1 Routine Maintenance Instructions............................................................................. 1-1

1.1 Routine Maintenance Overview......................................................................................... 1-1

1.1.1 Purpose of Routine Maintenance............................................................................ 1-1

1.1.2 Routine Maintenance Classification........................................................................ 1-1

1.1.3 BTS Routine Maintenance Record & Instructions................................................... 1-2

1.2 Weekly Maintenance Instructions...................................................................................... 1-8

1.3 Monthly Maintenance Instructions ..................................................................................... 1-9

1.4 Quarterly Maintenance Instructions................................................................................... 1-9

1.5 Yearly Maintenance Instructions...................................................................................... 1-10

1.6 Return Loss, VSWR and Reflection Coefficient .............................................................. 1-11

Huawei Technologies Proprietary

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User ManualM900/M1800 Base Transceiver Station (BTS30) Chapter 1 Routine Maintenance Instructions

Chapter 1 Routine Maintenance Instructions

1.1 Routine Maintenance Overview

1.1.1 Purpose of Routine Maintenance

Reliable running of the BTS depends on effective routine maintenance. The aim of

such maintenance is to detect and solve problems in time.

This chapter describes the contents of routine maintenance and the correctoperation procedures, thus providing the basic methods and reference basis of

routine maintenance for users in deciding local office maintenance solutions.

1.1.2 Routine Maintenance Classification

I. Classification by Implementing Methods

1) Conventional maintenance

To observe, test and analyze the equipment performance and operating conditions

by means of normal maintenance.

2) Unconventional maintenance

To check whether the equipment performance has degraded by observing, testing

and analyzing it in artificially-created special conditions.

For example, to avoid alarm system fault, the maintenance personnel can

deliberately create some faults and check whether the alarm system can generate

reports correctly.

II. Classification by Period Length

1) Unscheduled maintenance

Maintenance tasks incurred by equipment fault and network adjustment.

For example, the maintenance operations required at the time of user complaint,

equipment damage and line fault are unscheduled. In addition, problems found and

recorded in routine maintenance are also one of the triggering factors of

unscheduled maintenance operations.

2) Daily routine maintenance


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Maintenance operations conducted every day, which help the maintenance

personnel keep track of equipment running conditions and solve problems in time.

When a problem is found in daily maintenance, please record in detail the exact

physical position where it occurs and describe it in detail, so that maintenance

operations can be conducted in time to avoid bigger trouble.

3) Periodical routine maintenance

Maintenance operations conducted regularly, which help the maintenance personnel

keep track of the long-time performance of the equipment.

Periodical routine maintenance includes quarterly and yearly maintenance.

1.1.3 BTS Routine Maintenance Record & Instructions

BTS Weekly Maintenance Record

Please note down in this record the operations actually conducted in BTS weekly

maintenance. For methods of conducting weekly maintenance operations, please

refer to BTS Weekly Maintenance Instructions.

BTS Monthly Maintenance Record

Please note down in this record the operations actually conducted in BTS monthly

maintenance. For methods of conducting monthly maintenance operations, please

refer to BTS Monthly Maintenance Instructions.

BTS Quarterly Maintenance Record

Please note down in this record the operations actually conducted in BTS quarterly

maintenance. For methods of conducting quarterly maintenance operations, please

refer to BTS Quarterly Maintenance Instructions.

BTS Yearly Maintenance Record

Please note down in this record the operations actually conducted in BTS yearly

maintenance. For methods of conducting yearly maintenance operations, please

refer to BTS Yearly Maintenance Instructions.

BTS Unexpected Fault Handling Record

Please note down in this record the operations actually conducted in clearing the

unexpected faults that come up in BTS routine maintenance.

This record serves as a basis for future reference in equipment maintenance. The

maintenance personnel may modify the list of items in this record according to the

actual conditions of the local office, and compile several sheets of records into a

handbook on the clearing of unexpected faults.


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I. BTS Unexpected Fault Handling Record

Site name Home BSC

Time when faults occurTime when faultsget solved

Person on duty Faults handled by

Fault type:

Primary power supply Baseband frame Antenna and feeder system

Secondary power supply TRX frame

Others

Sources of fault information

Subscriber complaints Discovery in daily maintenance

Alarm system Other sources

Fault description:

Handling methods and results:


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II. BTS Weekly Maintenance Record

Site name:

Maintenance time: Maintenance personnel:

Maintenance item Maintenance status RemarksMaintenancepersonnel

Environment condition NormalAbnormal

Temperature condition NormalAbnormal

Humidity condition NormalAbnormal

Dust-proof condition NormalAbnormal

Indoor air-conditioner running state NormalAbnormal

Board running state NormalAbnormal

Fault description andhandling

Problems remained

Checked by shiftleader


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III. BTS Monthly Maintenance Record

Site name:



Call testNormalAbnormal

Check working status of battery setNormalAbnormal

Check grounding, lightning arrester and power supplysystem

NormalAbnormal

Check running status of antenna and feeder NormalAbnormal

Check running status of secondary power supplyNormalAbnormal


Problems remained

Checked by shift leader


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IV. BTS Quarterly Maintenance Record

Site name:



Check primary power supplyNormalAbnormal

Check running conditions of fanNormalAbnormal

Road testNormalAbnormal

VSWR test NormalAbnormal

Check alarm collecting devicesNormalAbnormal

Fault description andthe handling

Problems remained



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V. BTS Yearly Maintenance Record

Site name:


Maintenance item Maintenance status Remarks Maintenance personnel

Check running state of channel NormalAbnormal

Cabinet cleanness NormalAbnormal

Check base station power output NormalAbnormal

Earth resistance test and grounding cablecheck

NormalAbnormal

Check the waterproof status of antenna andfeeder connectors and lightning-proofgrounding cards

NormalAbnormal

Check the firmness of antenna and tower-topamplifier and the tilting angle of directionalantenna

NormalAbnormal


Problems remained



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1.2 Weekly Maintenance Instructions

Maintenance item Operation inst ruct ions Reference standard

Check the machine room for anyenvironment alarm including powersupply, fire and smoke alarms.

Everything should be normal. No alarmappears.

Environment conditionCheck the anti-theft net, doors andwindows, and other facilities in theequipment room.

The facilities including anti-theft net,doors and windows ought to be intact.

Temperature conditionObserve the thermometer indication inthe equipment room.

Normal equipment room environmental

temperature: 15C~30 C.

Humidity conditionObserve the hygrometer indication inthe equipment room.

Normal equipment room environmentalhumidity: 40% ~ 65%.

Dust-proof conditionObserve equipment housing,equipment interior, floor and desktop.

All items should be clean without anyvisible dust attaching. Then thedust-proof condition is good. If any itemis not up to the standard, then thedust-proof condition is bad.

Indoor air conditioner running statusCheck whether it is normally runningand whether the refrigeration functionis good.

The indication of the thermometer isconsistent with the temperature set andthe refrigeration system works.

Board running statusObserve whether indicators of allboards are normal.


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1.3 Monthly Maintenance Instructions


Call Test

Use the testor mobile station toperform call test with another onecooperating beside the BSC, andobserve whether calls are normalover all channels.

There should be no noises,interruptions or crosstalk.

Check the running status of batterysets

Check whether there is liquidleakage regarding the battery, or theconnection is loose.

Check the grounding, lightningarrester and power supply systems

Check whether the groundingsystem and lightning protectionsystem are working normally,whether the connection is reliable,whether the power supply system isworking normally and whether thereis any scorch for the lighteningarrester.

Make sure the signal lightningarrester, power supply lightningarrester, antenna and feeder lightningarrester are in good condition.

Check the working status of antennaand feeder system

Check whether there is standingwave alarm, whether there isdeviation of antenna support, andwhether the waterproofness of thefeeder line is good.

Check whether there is standing wavealarm from CDU.

Check the running conditions of

secondary power supply boards

See whether they are operating

normallyNo alarm.

1.4 Quarterly Maintenance Instructions


Primary power checkMeasure the output voltage and thevoltage of each battery, and checkthe aging of DC power cable.

Output voltage


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1.5 Yearly Maintenance Instructions


Check running conditions of channel

Use the testor mobile station to testthe communication conditions ofrespective channels. Observewhether there are call drop, callinterruption, noise and single-sidedcommunication, and make record forfuture reference.

Cabinet cleannessTools: vacuum cleaner, alcohol,towel etc.

Set strict operation regulations toavoid mis-touching switch or powersupply accidentally.

Check base station output power Measure TRX transmitting power.Check whether it is consistent withthe BSC setting.

Earth resistance test and groundingcable check

1. Measure earth resistance with anearth resistance meter.

2. Examine whether the connectorsof respective grounding cables areloose and check their agingcondition.

Check the waterproof conditions ofthe connectors and lightninggrounding clips

Check the external part or untie theinsulating tape to have a check

Reseal it with the same material!

Check the firmness of antenna andtower top amplifier and the tiltingangle of the antenna

1. Screw up the nut again with awrench.

2. Use an angle meter to check thetitling angle.

Do not apply too much force whenscrewing up the nut with the wrench.


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1.6 Return Loss, VSWR and Reflection Coefficient

Return loss (dB) VSWR Reflection coefficient ()4 4.41943 0.63096

5 3.56977 0.56234

6 3.00952 0.50119

7 2.61457 0.44668

8 2.32285 0.39811

9 2.09988 0.35481

10 1.92495 0.31623

11 1.78489 0.28184

12 1.6709 0.25119

13 1.57689 0.22387

14 1.49852 0.19953

15 1.43258 0.17783

16 1.37668 0.15849

17 1.32898 0.14125

18 1.28805 0.12589

19 1.25276 0.1122

20 1.22222 0.1

21 1.19569 0.08913

22 1.17257 0.07943

23 1.15238 0.07079

24 1.13469 0.0631

25 1.11917 0.05623

26 1.10553 0.05012

27 1.09351 0.04467

28 1.08292 0.03981

29 1.07357 0.03548

30 1.06531 0.03162

31 1.058 0.02818

32 1.05153 0.02512

33 1.0458 0.02239


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Return loss (dB) VSWR Reflection coefficient ()34 1.04072 0.01995

35 1.03621 0.01778

36 1.03221 0.01585

37 1.02866 0.01413

38 1.0255 0.01259

39 1.0227 0.01122

40 1.0202 0.01

41 1.01799 0.00891

42 1.01601 0.00794

43 1.01426 0.00708

44 1.0127 0.00631

45 1.01131 0.00562

46 1.01007 0.00501

47 1.00897 0.00447

48 1.00799 0.00398

49 1.00712 0.00355

50 1.00634 0.00316


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Formulas for calculating reflection coefficient , return Loss RL, and VSWR is

displayed in the following table:

Reflection coefficient VSWR Return loss (RL) Z1=Z2=Z3

=Ureflected

Uforward

VSWR=Uforward+Ureflected

UforwardUreflected

VSWR=Uforward+Ureflected

UforwardUreflected

=1

alog( )R20

VSWR=1+

1

RL=1

20log

=VSWR1

VSWR+1

VSWR=

alog( ) 1R20

R20alog( )+1

RL=VSWR+1

VSWR120log


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15-routine maintenance instructions.pdf

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