ZXSDR BS8900 GU360 (V4.00) Outdoor GSM&UMTS Dual Mode Macro Node B Maintenance Guide

ZXSDR BS8900 GU360Outdoor GSM&UMTS Dual Mode Macro Node B

Maintenance Guide

Version 4.00

ZTE CORPORATIONZTE Plaza, Keji Road South,Hi-Tech Industrial Park,Nanshan District, Shenzhen,P. R. China518057Tel: (86) 755 26771900Fax: (86) 755 26770801URL: http://ensupport.zte.com.cnE-mail: [email protected]

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Copyright © 2006 ZTE CORPORATION.

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All company, brand and product names are trade or service marks, or registered trade or service marks, of ZTE CORPORATIONor of their respective owners.

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ZTE CORPORATION or its licensors may have current or pending intellectual property rights or applications covering the subjectmatter of this document. Except as expressly provided in any written license between ZTE CORPORATION and its licensee,the user of this document shall not acquire any license to the subject matter herein.

ZTE CORPORATION reserves the right to upgrade or make technical change to this product without further notice.

Users may visit ZTE technical support website http://ensupport.zte.com.cn to inquire related information.

The ultimate right to interpret this product resides in ZTE CORPORATION.

Revision History

Revision No. Revision Date Revision Reason

R1.0 20090205 First edition

Serial Number: sjzl20090458

Content

About This Manual.............................................. i

Safety Instruction .............................................1Safety Overview............................................................. 1

Safety Symbols .............................................................. 1

Safety Specifications....................................................... 3

Routine Maintenance.........................................7Overview....................................................................... 7

Purpose..................................................................... 7

Methods .................................................................... 7

Precautions................................................................ 8

Daily Maintenance .......................................................... 9

Daily Routine Maintenance Items .................................. 9

Handling Alarm .........................................................10

Querying and Handling Current Alarms ................10

Querying and Analyzing Past 24-Hour History

Alarms .................................................12

Querying Real-Time Status of Each Cell ........................14

Analyzing Daily Cell Performance Report Data................15

Handling Common Faults ............................................17

Handling Subscriber Complaints ..................................17

Monthly Maintenance .....................................................18

Monthly Routine Maintenance Items .............................18

Analyzing Alarm Frequency .........................................18

Analyzing Monthly Cell Performance Report Data ...........21

Main Equipment Maintenance ......................................23

Checking Cabinet Power Supply ..........................23

Checking Cabinet Grounding...............................24

Checking Cabinet Protection ...............................24

Testing Heat Exchanger .....................................25

Cable Connection Checking .........................................25

Checking Trunk Cable Connection........................25

Checking Fiber Connection .................................26

Checking Data Cable and Monitoring Cable

Connections ..........................................26

Spare Part Checking...................................................26

Checking Storage Environment of Spare

Parts ....................................................26

Checking Amount of Spare Parts .........................27

Quarterly Maintenance ...................................................27

Quarterly Routine Maintenance Items...........................27

Testing Call, Coverage, and Handover...........................28

Main Equipment Maintenance ......................................28

Checking Fan’s Running Status ...........................28

Checking Board’s Running Status ........................28

Heat Exchanger Maintenance..............................34

Cable Connection Checking .........................................35

Checking RF Cable Connection ............................35

Checking GPS Cable Connection..........................35

Semiyearly Maintenance.................................................36

Biannual Routine Maintenance Items ............................36

Equipment Cleaning ...................................................36

Cleaning Fan Subrack ........................................36

Board Diagnosis and Test............................................37

Yearly Maintenance........................................................38

Yearly Routine Maintenance Items ...............................38

BTS Testing ..............................................................39

Measuring Power Amplifier’s Output Power ...........39

Measuring SWR ................................................40

Testing CC Board Changeover......................................40

Grounding Checking...................................................42

Checking Lightning Protector ..............................42

Checking Grounding Cable .................................43

Testing Grounding Resistance .............................43

Antenna Feeder System Checking ................................43

Checking Antenna Feeder Interface .....................43

Checking Firmness of Antenna and Tower

Amplifier...............................................44

Checking Directional Antenna Tilt ........................44

Checking Waterproof Status of Antenna Feeder

Connectors and Lightning Protection

Grounding Clips .....................................46

Other Checking .........................................................46

Checking Iron Tower..........................................46

Checking Pole...................................................46

Checking Running Status of Batteries ..................47

Emergency Maintenance..................................49Overview......................................................................49

Emergency Maintenance Scenarios...............................49

Emergency Maintenance Flow......................................49

Emergency Maintenance Precautions ............................52

Emergency Process........................................................53

Automatic Active-Standby Changeover .........................53

Manual Active-Standby Changeover .............................53

Resetting Power-Down Board ......................................54

Checking Whether Fan Is Running Normally ..................55

Service Recover ............................................................56

Service Resuming Flow...............................................56

Service Recover Procedure..........................................58

Checking Whether PM Is Normal .........................58

Repairing Power Supply System ..........................58

Checking Power Supply of Main Boards ................58

Checking Whether Service Boards Run

Normally...............................................58

Resetting/Replacing Board..................................59

Checking Whether Fault Is due to Configuration

Data Modification ...................................59

Resuming Original Configuration Data..................59

Collecting Fault Information................................60

Troubleshooting ..............................................61Common Troubleshooting Process ....................................61

Common Service Troubleshooting ....................................63

Low Call Completion Ratio...........................................63

Poor Call Quality........................................................64

Slow to Access the Internet ........................................66

Common Equipment Troubleshooting................................66

Temperature of RU Board Being High............................66

B121 DC Power Distribution Unit Fault ..........................67

B121 AC Power Distribution Unit Fault ..........................70

B121 Monitoring Unit Fault..........................................75

B121 Rectifier Fault....................................................75

Heat Exchanger Fault .................................................77

Environment Alarm unable to Be Reported ....................77

Part Replacement............................................79Replaceable Part List ......................................................79

Board Replacement........................................................80

Board Replacement Instructions ..................................80

Replacing RU ............................................................81

Replacing PM ............................................................83

Replacing CC/FS/UBPG/BPC ........................................84

Replacing SA.............................................................86

Replacing FA .............................................................86

Subrack Replacement.....................................................88

Subrack Replacement Instructions ...............................88

Replacing B121 Power Supply......................................89

Replacing PDM Subrack ..............................................90

Replacing Fan Subrack ...............................................91

Replacing Battery ......................................................92

Replacing Heat Exchanger...........................................93

Replacing Lightning Protection Subrack.........................94

Replacing BBU...........................................................95

Data Record Forms..........................................97Daily Maintenance Record Form.......................................97

Monthly Maintenance Record Form...................................99

Quarterly Maintenance Record Form............................... 100

Biannual Maintenance Record Form................................ 101

Yearly Maintenance Record Form ................................... 102

Part Replacement Data Record Form .............................. 104

Emergency Troubleshooting Record Form........................ 105

Figures ..........................................................107

Tables ...........................................................109

About This Manual

Purpose This manual introduces maintenance methods of ZXSDR BS8900GU360 (V4.00) Outdoor GSM&UMTS Dual Mode Macro Node B sys-tem (BS8900 GU360 for short), including routine maintenance,emergency maintenance, troubleshooting, and part replacement.It also provides tables for recording equipment maintenance infor-mation.

The BS8900 GU360 documents includes the following manuals:

ZXSDR BS8900 GU360(V4.00) Outdoor GSM&UMTS Dual ModeMacro Node B Documentation Guide

ZXSDR BS8900 GU360(V4.00) Outdoor GSM&UMTS Dual ModeMacro Node B System Description

ZXSDR BS8900 GU360(V4.00) Outdoor GSM&UMTS Dual ModeMacro Node B Hardware Description

ZXSDR BS8900 GU360(V4.00) Outdoor GSM&UMTS Dual ModeMacro Node B Hardware Installation Guide

ZXSDR BS8900 GU360(V4.00) Outdoor GSM&UMTS Dual ModeMacro Node B Configuration Guide

ZXSDR BS8900 GU360(V4.00) Outdoor GSM&UMTS Dual ModeMacro Node B Configuration Parameter Reference

ZXSDR BS8900 GU360(V4.00) Outdoor GSM&UMTS Dual ModeMacro Node B Alarm Code Reference

ZXSDR BS8900 GU360(V4.00) Outdoor GSM&UMTS Dual ModeMacro Node B Maintenance Guide

What Is in ThisManual

This guide contains the following chapters.

Section Summary

Chapter 1, SafetyInstruction

Gives safety instruction for BS8900 GU360maintenance.

Chapter 2, RoutineMaintenance

Introduces BS8900 GU360 routine maintenanceitems and methods.

Chapter 3,EmergencyMaintenance

Introduces BS8900 GU360 emergencymaintenance scenario, flow, handling methods,and the service resuming ways.

Chapter 4,Troubleshooting

Introduces common troubleshooting methodsfor BS8900 GU360.

Chapter 5, PartReplacement

Introduces methods of part replacement forBS8900 GU360.

Appendix A, DataRecord Forms

Gives maintenance record forms of BS8900GU360 for keeping the equipment maintenanceinformation.

Confidential and Proprietary Information of ZTE CORPORATION i

ZXSDR BS8900 GU360 Maintenance Guide

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ii Confidential and Proprietary Information of ZTE CORPORATION

C h a p t e r 1

Safety Instruction

Table of ContentsSafety Overview................................................................. 1Safety Symbols .................................................................. 1Safety Specifications........................................................... 3

Safety OverviewOnly qualified professional staff who has received BSS training caninstall, operate and maintain the equipment.

BSS maintenance personnel must:

Master basic theories of BSS system

Be familiar with BSS system principles and networking

Have network optimization skills

During the installation, operation and maintenance of the equip-ment, one should strictly abide by all the safety rules and relatedoperation procedures on the site to avoid body injuries or equip-ment damages. The safety precautions introduced in this manualare only supplementary to the local safety rules.

ZTE assumes no responsibility for consequences resulting from vi-olation of the general specifications for safety operations or safetystandards for design, production, and equipment usage.

Safety SymbolsTable 1 lists safety symbols.

TABLE 1 SAFETY SYMBOLS DESCRIPTION

Safety Symbol Meaning

Universal alerting symbol:General safety attentions.

Confidential and Proprietary Information of ZTE CORPORATION 1


Safety Symbol Meaning

Electrostatic: The device may besensitive to static electricity.

Electric shock: Risk of electricshock.

Scald: Be aware of scald.

Laser: Beware of strong laserbeam.

Microwave: Beware of strongelectromagnetic field.

Amongst these safety symbols, the universal alarm symbols areclassified into four levels: danger, warning, caution, and note. Theformats and meanings of the four levels are described as below:

Danger:

Indicates a potentially hazardous situation which, if not avoided,will result in death or serious injury of people, or equipment dam-ages and breakdown.

Warning:

Indicates a potentially hazardous situation which, if not avoided,could result in serious injuries, or equipment damages or interrup-tion of main services.

Caution:

Indicates a potentially hazardous situation which, if not avoided,could result in serious injuries, or equipment damages or interrup-tion of part services.

Note:

Indicates a potentially hazardous situation which, if not avoided,could result in injuries, or equipment damages or interruption ofpart services.

2 Confidential and Proprietary Information of ZTE CORPORATION

Chapter 1 Safety Instruction

Safety SpecificationsElectrical Safety

Electric Shock:

Never install or uninstall power cables while they are live becausewhen touched with a conductor may produce sparks, resulting infire or damage to eyes.

Do shut off power supply before connecting or disconnecting apower cable.

Before connecting a cable, make sure that the cable and its labelmeet the actual installation requirements.

Warning:

It is not allowed to drill cabinet holes without permission. Unqual-ified drilling could damage wiring inside the cabinet. Additionally,the metal pieces inside the cabinet created by drilling could resultin a shorted circuit board.

Antistatic

Electrostatic:

Static electricity produced by human body can damage static-sen-sitive components on circuit board, such as large-scale integratedcircuits.

Friction caused by human body activities is the root cause of elec-trostatic charge accumulation. Static voltage carried by a humanbody in a dry environment can be up to 30 kV, and can remain inthere for a long time. An operator with static electricity may dis-charge electricity through a component when he/she touches theconductor and causing damage.

Wear an antistatic wrist strap (the other end of wrist strap must bewell grounded) before touching the equipment or holding a plug-inboard, circuit board, Integrated Circuit (IC) chip or other devices,to prevent human static electricity from damaging sensitive com-ponents.



Laser

Laser:

Avoid looking straight at the laser beam from the outlet of theoptical transceiver or inside the optical fiber to avoid eye damage.

High Temperature

Danger:

Avoid touching the surface area of some devices due to high tem-perature to avoid a scald injury.

Fans

Warning:

Do not put fingers or any tools in the running fan to avoid an injury.Keep tools away from the running fan.

Sticking finger inside a running fan may cause hurt.

Put parts, screws, and tools away from the fan when replacingrelated parts, to avoid damage to the fan or related devices.

Keep fingers and board away from the fan when replacing devicesaround the fan, to avoid damage to the equipment or fingers.

Hoisting HeavyObjects

Warning:

Do not walk or stay under the hoisted objects during hoisting op-erations.

Ensure a proper hoisting capability of the hoister when disas-sembling heavy equipment moving, and replacing equipment.

The operator must receive the training and qualification forhoisting operations. Inspect and complete the hoisting toolsbefore getting into service.

Make sure to fix the hoisting tools firmly on a sufficiently se-cured object or wall before the hoisting operation.

Use brief oral instructions during the hoisting operations to pre-vent mistaken operation.

Plugging/Unplug-ging Modules

The modules mentioned in this document include front board, rearboard, and fan module.


Chapter 1 Safety Instruction

Caution:

Avoid inserting a module forcibly. Otherwise, the pin on thebackplane may bent.

Align the module with the guide rail and push it gently to thebackplane. Plug the module properly into the slot to preventshort circuit due to contact between the module and the circuitsurface.

Avoid touching the circuits, components, connectors, and ca-ble troughs when holding a module.

RF module turns hot when running. Avoid being scalded whenplugging and unplugging an RF module.

Personnel

Caution:

Non-professionals can only perform maintenance inside the equip-ment with the presence or under instructions of professionals onsite.

Replacing any parts or altering the equipment may result in un-expected dangers. Therefore, avoid replacing any parts or alter-ing the equipment unless authorized. Contact ZTE in case of anyqueries.


C h a p t e r 2

Routine Maintenance

Table of ContentsOverview........................................................................... 7Daily Maintenance .............................................................. 9Monthly Maintenance .........................................................18Quarterly Maintenance .......................................................27Semiyearly Maintenance.....................................................36Yearly Maintenance............................................................38

OverviewPurpose

Routine maintenance means checking the equipment status pe-riodically to find and solve problems in time to prevent potentialdamages or faults.

Methods

The following lists common methods for locating faults during rou-tine maintenance:

Alarm and notification check

Query equipment alarms and notifications at background, per-form analysis to determine whether there is anything abnor-mal, and implement appropriate handling.

Equipment running status check

Query the site’s running status at background, such as the cell’sreal-time status, perform analysis and implement appropriatehandling.

Performance index check

Query various site performance indices at background, analyzethese indices and implement appropriate handling.

Main equipment check



Check the site equipment’s running conditions, such as theequipment’s power supply and the board’s running status.

Cable connection check

Check various cable connections and make sure that cable la-bels are pasted appropriately.

Grounding and lightning protection check

Check the site’s lightning protection system and the groundingsystem to make sure that they are reliable.

Antenna feeder system check

Check the feeder cable connection of the site’s antenna feedersystem, the waterproof condition, and the antenna downtilt.

Spare part check

Check the amount of the spare parts and the storage environ-ment.

Site test

Perform the coverage test and the handover test for the site,measure the site’s power and SWR, and handle problems intime if there is any.

Board diagnosis and test

Perform diagnosis and test for boards at background.

Daily fault handling

Perform analysis for daily faults detected and handle them intime.

Equipment cleaning

Clean the equipment periodically to avoid dust accumulatingand guarantee the equipment’s normal running.

Precautions

The following matters should be noticed during routine mainte-nance:

1. Ensure the stability and reliability of the primary power supplyand check the system ground and lightning protection groundperiodically. Before stormy season and after thunder storms,check the lightning protection system to make sure all facilitiesare in good conditions.

2. Regulate the routine work of maintenance personnel. Keepa detailed duty log to provide details about system opera-tion, version, data change, upgrading, and troubleshooting onday-to-day basis for follow-up analysis and troubleshooting inthe event of a fault. Also keep a shift record to specify theresponsibility clearly.

3. Maintenance personnel should be trained to grasp certainknowledge related to equipment and network before perform-ing the routine maintenance. During maintenance operations,it is necessary to follow the instructions described in relatedmanuals of BS8900 GU360. Before touching the equipment,


Chapter 2 Routine Maintenance

maintenance personnel must wear antistatic wrist strap toavoid accidents.

4. It is strictly forbidden to run the signaling tracing program dur-ing daytime when the traffic is heavy. Signaling tracing canonly be performed in low-traffic hours with permission by thelocal ZTE office.

5. Check the spare parts periodically to guarantee that they are ingood conditions without being affected by moisture. Make surethat there is sufficient stock of commonly used spare parts.Keep the spare parts separate from those faulty parts and labelthem for identification.

6. Handle fault as soon as possible. Contact the local ZTE officefor any problem that cannot be resolved.

7. Place the local ZTE office’s contact information at a visible placeand make it known to all maintenance personnel. Update thecontact information in time.

Daily MaintenanceDaily Routine Maintenance Items

Table 2 lists the daily routine maintenance items.

TABLE 2 DAILY ROUTINE MAINTENANCE ITEMS

Category Items

Querying and handling currentalarms

Querying and analyzing the past24–hour history alarmsAlarms and notifications

Querying and analyzing the past24–hour history notifications

Running status Querying real-time BTS cells sta-tus

Performance indices Analyzing daily cell performancereport data

Handling common faultsTroubleshooting

Handling subscriber complaints



Handling Alarm

Querying and Handling Current Alarms

Prerequisites Communication between the NetNumen M31 client and theNetNumen M31 server is normal.

Connections between the NetNumen M31 server and networkelements are normal.

Steps 1. Log in to the NetNumen M31 client.2. Click View > Fault Management, the Fault Management

interface appears, as shown in Figure 1.

FIGURE 1 FAULT MANAGEMENT INTERFACE

3. Right-click on the site node to be queried in the left ResourceView, select Show current alarms > Show all currentalarms, as shown in Figure 2.



FIGURE 2 DISPLAYING CURRENT ALARMS

4. View the site’s current alarms in the right pane, as shown inFigure 3.

FIGURE 3 VIEWING SITE’S CURRENT ALARMS

ReferenceStandard

The site has no abnormal alarm in the fault management interface.

AbnormalityHandling

Double-click an alarm to obtain the alarm details in the Detailsdialog box, as shown in Figure 4. Handle the alarm accordingto suggestions given in the Maintenance Suggestion tab in thedialog.



FIGURE 4 ALARM DETAILS DIALOG BOX

Precautions None

Querying and Analyzing Past 24-Hour HistoryAlarms




interface appears.3. Click Query > View History Alarms, the History Alarms

Query Conditions tab appears on the right.4. In the History Alarms Query Conditions tab, click theQuick

Search button, as shown in Figure 5.



FIGURE 5 CLICKING QUICK SEARCH BUTTON

5. Set query conditions in the Query History Alarm dialog box.Select System Type and Location for the site to be queried,as shown in Figure 6.

FIGURE 6 SETTING QUERY CONDITION - LOCATION



6. Select Restore Time and set it to be the past 24 hours, asshown in Figure 7.

FIGURE 7 SETTING QUERY CONDITION - RESTORE TIME

7. Click the OK button after setting query conditions, and thesystem will display all history alarms during the past 24 hours.

ReferenceStandard

The alarm query result is displayed normally. There is no abnormalalarm and no frequently occurring alarm .

AbnormalityHandling

Perform analysis for abnormal alarms and alarms that frequentlyoccur. Find out causes for these alarms and handle frequentlyoccurring alarms in time.

Precautions None

Querying Real-Time Status of EachCell



Steps 1. Log in to the NetNumen M31 client.



2. Start the NE agent.3. In Physical View of the Topology Management tab, click

NE Agent > Dynamic Data Management.4. On the left pane, right-click on the Base station sys-

tem/logic site > Cell, select Channel Statistics Query.The system displays the service channel and signaling channelconfigurations and real-time status in the current cell.

5. Click Cell > Transceiver, and right-click on Refresh, the real-time status of all channels of the transceiver will be displayed.

ReferenceStandard

The channel status in the cell is normal, there is no blocked chan-nel. The real-time occupation of voice channel exists.

AbnormalityHandling

For sites with blocked channels, perform handling according tothe site alarms reported in Fault Management. For sites with-out channel occupation or abnormal channel occupation (such aschannel being released once being occupied), perform handlingaccording to information obtained in Fault Management and sig-naling tracing.

Precautions Before using Dynamic Data Management, the NE agent mustbe started first.

Analyzing Daily Cell PerformanceReport Data



Steps 1. Log in to the NetNumen M31 client.2. Click View > Performance Management, the Performance

Management interface appears.3. Click Performance Management > Performance data

query, the Query dialog box appears.4. In the Query dialog box, select the Query Index tab, set

the Ne Type to be IBSCMEID and the Object Type to beCellFunction(GSM). Select indices or measurement types tobe queried, as shown in Figure 8.



FIGURE 8 SETTING QUERY INDEX

5. In the Query Time tab, select Daily Summary, as shown inFigure 9.

FIGURE 9 SETTING QUERY TIME

6. In the Query Object tab, select the cell to be queried, asshown in Figure 10.



FIGURE 10 SETTING QUERY OBJECT

7. Click the OK button to analyze the query result.

ReferenceStandard

All performance indices in the query result are normal.

AbnormalityHandling

Perform relevant handling according to abnormal indices in thereport.

Precautions In the Query Index tab, the Object Type can also be set asIBTSTRX(GSM) or IBTSTS(GSM).

Handling Common Faults

Common fault handling involves handling fault indicated in alarmmessages, such as the transmission fault and board fault.

Handling Subscriber Complaints

Test and troubleshoot faults according to subscribers’ complaints.



Monthly MaintenanceMonthly Routine Maintenance Items

Table 3 lists the monthly routine maintenance items.

TABLE 3 MONTHLY ROUTINE MAINTENANCE ITEMS

Category Items

Alarms and notifications Analyzing alarm frequency

Performance indices Analyzing monthly cell perform-ance report data

Checking cabinet power supply

Checking cabinet grounding

Checking cabinet protectionMain equipment

Testing heat exchanger

Checking trunk cable connection

Checking fiber connectionCable connections

Checking data cable and monitor-ing cable connections

Checking storage environment ofspare parts

Spare partsChecking the amount of spareparts

Analyzing Alarm Frequency




interface appears.3. Click Query > History Alarm Statistics, the List of Report

Templates tab appears in the right pane.4. In the List of Report Templates tab, double-click Statistics

Frequency By Alarm Code, as shown in Figure 11.



FIGURE 11 DOUBLE-CLICKING STATISTICS FREQUENCY BY ALARM CODE

5. Set query conditions in the Parameter Input Box-StatisticsFrequency By Alarm Code dialog box. Set System Typeand Location for the site to be queried, as shown in Figure12.



FIGURE 12 SETTING QUERY CONDITION - LOCATION

6. Select Happen Time and set it to be the past one month, asshown in Figure 13.



FIGURE 13 SETTING QUERY CONDITION - HAPPEN TIME

7. Click the OK button after setting query conditions to analyzethe alarm frequency.

ReferenceStandard

The alarm frequency query result is output normally.

AbnormalityHandling

Perform analysis for alarms that occur frequently.

Precautions In the List of Report Templates tab, user can also select othertemplate to perform query and analysis for history alarms.

Analyzing Monthly Cell PerformanceReport Data



Steps 1. Log in to the NetNumen M31 client.2. Click View > Performance Management, the Performance

Management interface appears.



3. Click Performance management > Performance dataquery, the Query dialog appears.

4. In the Query dialog box, select the Query Index tab, setthe Ne Type to be IBSCMEID and the Object Type to beCellFunction(GSM). Select indices or measurement types tobe queried, as shown in Figure 14.

FIGURE 14 SETTING QUERYING INDEX

5. In the Query Time tab, select Monthly Summary, as shownin Figure 15.

FIGURE 15 SETTING QUERY TIME



6. In the Query Object tab, select the cell to be queried, asshown in Figure 16.

FIGURE 16 SETTING QUERY OBJECT

7. Click the OK button to analyze the query result.

ReferenceStandard

All performance indices in the query result are normal.

AbnormalityHandling

Perform relevant handling for abnormal indices in the report.

Precautions In the Query Index tab, the Object Type can also be set asIBTSTRX(GSM) or IBTSTS(GSM).

Main Equipment Maintenance

Checking Cabinet Power Supply

Prerequisites Prepare a multimeter for testing the power supply.

Steps 1. Check power input terminals and power output terminals of thepower distribution subrack to see whether they have normalsizes and good contact. Check whether there is any problemof corrosion, over-current, or over-temperature.

2. Check power input terminals, power output terminals, andpower sockets of each component inside the cabinet to seewhether they have normal sizes and good contact. Checkwhether there is any problem of corrosion, over-current, orover-temperature.

3. Use the multimeter to measure the power distribution sub-rack’s input voltage. Check whether the power cable is aging.



ReferenceStandard

1. All connection parts have good contact, and there is no problemof loosening or corrosion.

2. There is no equipment that has distorted appearance or theproblem of contacting part being hot for long term.

3. DC power nominal value: –48 V DC; allowed fluctuation range:–57 V DC ~ –40 V DC.

The DC power cable is not aging.

AbnormalityHandling

If the DC power supply is abnormal, check whether there is anyalarm of the power supply. Perform troubleshooting according tothe alarm indicator meanings and power supply equipment instruc-tions. Replace the DC power cable if it is aging.

Precautions None

Checking Cabinet Grounding

Prerequisites Prepare a grounding resistance tester before checking the cabinetgrounding.

Steps 1. Check connection terminals and fastening screws of all ground-ing cables inside the cabinet to see whether they have goodcontact. Check whether there is any problem of loosening orcorrosion.

2. Use the grounding resistance tester to measure grounding re-sistance of the equipment room.

ReferenceStandard

1. All connection parts have good contact, and there is no problemof loosening or corrosion.

2. The joint grounding resistance is less than 5 Ω; for specialdesign, the grounding resistance satisfies the design require-ment.

AbnormalityHandling

Replace damaged grounding cables or connection terminals, andfasten the screws. If the equipment room’s grounding resis-tance does not satisfy the design requirement, check whetherthe grounding downlead is firmly connected with the groundingnetwork.

Precautions None

Checking Cabinet Protection

Prerequisites None

Steps 1. Check the cabinet top and inside to see whether there is anyobject that is not the cabinet’s component.

2. Check the rodent-resistant net at the signal cable outlet oncabinet top or at cabinet bottom to see whether it is boundtightly and not damaged.

ReferenceStandard

1. On the cabinet top and inside the cabinet, there is no objectthat is not the cabinet’s component.

2. All rodent-resistance nets are bound tightly and not damaged.

AbnormalityHandling

On top of or inside the cabinet, remove object that is not the cab-inet’s component. Bind the rodent-resistance net tightly.



Precautions None

Testing Heat Exchanger

Prerequisites None

Steps 1. Press the TEST key, the internal circulating fan, the externalcirculating fan, and the heater will be forced to run for 2 min-utes, and then automatically resume to status before the testis performed.

2. Under the test status, press the TEST key to exit the test.

Note:

If serious sandstorm problem exists in the local area, cleanshutters of the heat exchanger and at the lower part of the frontdoor. For operation details, refer to Cleaning Shutter and HeatExchanger Maintenance.

Normal Result The five alarm indicators on the heat exchanger are green or yel-low, indicating that the working status is normal.

AbnormalityHandling

If the indicator of a part is red, it indicates that the part is faulty.For handling details, refer to Analysis and Handling of Heat Ex-changer Faults.

Precautions 36448

During the first half month after the heat exchanger starts running,the heat exchanger test should be performed.

Cable Connection Checking

Checking Trunk Cable Connection

Prerequisites None

Steps 1. Check whether the trunk cable connectors are reliable.2. Check whether the trunk cable is not damaged.3. Check whether the cable label is clear.

ReferenceStandard

1. The trunk cable connection is reliable.2. The trunk cable is not damaged.3. The cable label is clear.

AbnormalityHandling

Replace the trunk cable if it is damaged; for operations details,refer to Replacing E1/T1 Cable. Use clear cable label.

Precautions If it is necessary to replace the trunk cable, interrupt the BTS ser-vice.



Checking Fiber Connection

Prerequisites None

Steps 1. Check whether fiber connectors of BBU and RU are reliable.2. Check whether the fiber is not damaged.3. Check whether the cable label is clear.

ReferenceStandard

1. The fiber connection is reliable.2. The fiber is not damaged.3. The cable label is clear.

AbnormalityHandling

Replace the fiber if it is damaged; for operation details, refer toReplacing Internal Fiber. Use clear cable label.

Precautions If it is necessary to replace the fiber, interrupt the RU service.

Checking Data Cable and Monitoring CableConnections

Prerequisites None

Steps 1. Check whether the cable connectors are reliable.2. Check whether the cable is not damaged.3. Check whether the cable label is clear.

ReferenceStandard

1. The cable connection is reliable.2. The cable is not damaged.3. The cable label is clear.

AbnormalityHandling

Replace the cable if it is damaged; for operations details, referto Replacing Dry Contact Cable and Replacing RS232 and RS485Monitoring Cable. Use clear cable label.

Precautions None

Spare Part Checking

Checking Storage Environment of Spare Parts

Prerequisites None

Steps Periodically check the spare part storeroom for the temperature,humidity, fireproof condition, dampproof condition, dust-proofcondition, antimagnetic condition, shockproof condition, andventilation.

ReferenceStandard

The spare part storeroom environment satisfies ZTE communica-tion equipment storage requirements.



Precautions None

Checking Amount of Spare Parts

Prerequisites None

Steps Check the spare part types and amount to see whether they satisfythe equipment maintenance requirement.

ReferenceStandard

1. According to the equipment hardware configuration, each typeof board should have one spare board at least, and the CCboard and the FS board each should have two spare boards atleast.

2. All spare parts should be kept in good conditions, without cor-rosion or damage.

AbnormalityHandling

All damaged spare parts and replaced parts should be returned toZTE Corporation for repair as soon as possible.

Precautions None

Quarterly Maintenance

Quarterly Routine Maintenance Items

Table 4 lists the quarterly routine maintenance items.

TABLE 4 QUARTERLY ROUTINE MAINTENANCE ITEMS

Category Items

Base station testTesting call, coverage, and hand-over

Checking the fan’s running status

Checking the board’s running sta-tus

Main equipment Heat exchanger maintenance

Checking RF cable connections

Cable connections Checking GPS cable connections



Testing Call, Coverage, andHandover

Prerequisites Prepare the testing MS and drive tester before testing call, cover-age, and handover.

Steps Use the testing MS and drive tester to test the base station for call,coverage, and handover.

Normal Result The call quality is good, the handover process is normal withoutcall drop occurring, and the base station’s coverage range is nor-mal.

AbnormalityHandling

Perform relevant handling for problems found in the test.

Precautions None

Main Equipment Maintenance

Checking Fan’s Running Status

Prerequisites Communication between the NetNumen M31 client and the Net-Numen M31 server is normal.

Steps 1. At the NetNumen M31 client, check whether there is any fanalarm in Fault Management.

2. Check whether the fan in the cabinet’s fan subrack is runningnormally.

3. Check whether the fan in the FA module in BBU is runningnormally.

ReferenceStandard

All fans work normally with even rotational speed and withoutalarms.

AbnormalityHandling

If the fan is faulty, replace the fan subrack or replace the fan; foroperation details, refer to Replacing Fan Subrack and ReplacingFA.

Precautions When checking the fan’s running status, do not put the finger intothe fan.

Checking Board’s Running Status

Prerequisites Communication between the NetNumen M31 client and the Net-Numen M31 server is normal.

Steps 1. Check RU60 (or RU40/RU02), and check indicators on panelsof CC, UBPG (or BPC), FS, and SA, to see whether there is anyalarm.

2. Check whether the panel indicator indicates alarm but noalarm is reported in Fault Management at the NetNumenM31 client.



ReferenceStandard

All boards are running normally, without any alarm.

1. Table 5 lists normal status of indicators on RU60 (orRU40/RU02) panel.

TABLE 5 NORMAL STATUS OF RU PANEL INDICATORS

Indica-tor

Color Meaning Description

RUN Green Runningindicator

Constantly ON: RU is beingreset or started.

Flashing at 1 Hz: RU status isnormal.

Flashing at 5 Hz: version isbeing downloaded.

LINK Green Opticalinterfacelinkindicator

Constantly ON: the fiberconnection is normal.

Flashing at 5 Hz: the link istaken as clock reference source,and Phase Lock Loop (PLL) is infast pull-in status.

Flashing at 0.25 Hz: the link istaken as clock reference source,and PLL is in tracing status.

RF Orange RF workingstatusindicator

ON: RF has output.

2. Table 6 lists normal status of indicators on CC panel.

TABLE 6 NORMAL STATUS OF CC PANEL INDICATORS

Indica-tor


HS Blue Boardextractionindicator

ON: indicating that the boardcan be pulled out.

Flashing: indicating the board isbeing activated or deactivated.

OFF: indicating that the boardcan not be pulled out.


Constantly ON: the board isbeing reset.

Flashing at 1 Hz: the board isrunning in normal status.



Indica-tor


E0S Green 0 ~ 3 E1/T1statusindicator

Flashing according to time;flashing at most 4 times persecond; 5 Hz flashing frequency:

The first second: flashing once,indicating the 0th line is normal.

The third second: flashingtwice, indicating the 1st line isnormal.

The fifth second: flashing threetimes, indicating the 2nd line isnormal.

The seventh second: flashingfour times, indicating the 3rdline is normal.

The indicator flashes accordingto the above loop, each looptakes eight seconds.

E1S Green 4 ~ 7 E1/T1statusindicator

Same as above

E2S Green 8 ~ 11E1/T1statusindicator

Same as above

E2S Green 12 ~ 15E1/T1statusindicator

Same as above

MS Green Ac-tive/standbystatusindicator

ON: the board is in active status.

OFF: the board is in standbystatus.

REF Green GPS an-tenna sta-tus or 2MHz sta-tus indica-tor (corre-spondingto differ-ent con-nectionsof SMAinterfaceon boardpanel)

Constantly ON: indicating thatthe antenna feeder is normal.

Constantly OFF: indicatingthat the antenna feeder andsatellite are normal and arebeing initialized.



Indica-tor


ETH0 Green Abis/Iubinterfacelink statusindicator

Constantly ON: the Abis/Iubnetwork/electrical/opticalinterface physical links arenormal.

ETH1 Green ETH1networkinterfacelink statusindicator

ON: the network interfacephysical link is normal.

3. Table 7 lists normal status of indicators on UBPG (or BPC)panel.

TABLE 7 NORMAL STATUS OF UBPG (OR BPC) PANEL INDICATORS

Indica-tor









4. Table 8 lists normal status of indicators on FS panel.

TABLE 8 NORMAL STATUS OF FS PANEL INDICATORS

Indica-tor









MS Green Ac-tive/standbystatusindicator

ON: the board is in active status.

OFF: the board is in standbystatus.



5. Table 9 lists normal status of indicators on SA panel.

TABLE 9 NORMAL STATUS OF SA PANEL INDICATORS

Indica-tor









AbnormalityHandling

1. Table 10 lists abnormal status of indicators on RU60 (orRU40/RU02) panel.

TABLE 10 ABNORMAL STATUS OF RU PANEL INDICATORS

Indica-tor



OFF: indicating self-test failure.

ALM Red Alarmindicator

Flashing at 5 Hz: indicatingcritical or emergent alarm.

Flashing at 1 Hz: indicatingminor alarm.

LINK Green Opticalinterfacelinkindicator

OFF: the fiber is disconnected.

RF Orange RF workingstatusindicator

OFF: RF has no output.

2. Table 11 lists abnormal status of indicators on CC panel.

TABLE 11 ABNORMAL STATUS OF CC PANEL INDICATORS

Indica-tor





ON: indicating that the boardhas alarm.



Indica-tor


REF Green GPS an-tenna sta-tus or 2MHz sta-tus indica-tor (corre-spondingto differ-ent con-nectionsof SMAinterfaceon boardpanel)

Flashing at 1 Hz: indicatingthat the antenna feeder isdisconnected.

Flashing at 2 Hz: the antennafeeder is normal but can notreceive the satellite signal.

Flashing at 0.5 Hz: the antennais short-circuited.

Flashing at 5 Hz: no message isreceived at initialization.

ETH0 Green Abis/Iubinterfacelink statusindicator

OFF: the Abis/Iub networkinterface physical link isdisconnected.

ETH1 Green ETH1networkinterfacelink statusindicator

OFF: The network interfacephysical link is disconnected.

3. Table 12 lists abnormal status of indicators on UBPG (or BPC)panel.

TABLE 12 ABNORMAL STATUS OF UBPG (OR BPC) PANEL INDICATORS

Indica-tor



ON: the board has alarm.



4. Table 13 lists abnormal status of indicators on FS panel.

TABLE 13 ABNORMAL STATUS OF FS PANEL INDICATORS

Indica-tor






5. Table 14 lists abnormal status of indicators on SA panel.



TABLE 14 ABNORMAL STATUS OF SA PANEL INDICATORS

Indica-tor






Precautions None

Heat Exchanger Maintenance

Prerequisites Quarterly heat exchanger maintenance includes testing heatexchanger, replacing heat box, and cleaning heat exchangercavity.

Tools: cotton thread, cross screwdriver

Steps 1. Test the heat exchanger: Press the TEST key, the internal cir-culating fan, the external circulating fan, and the heater willbe forced to run for 2 minutes, and then automatically resumeto status before the test is performed. Under the test status,press the TEST key to exit the test.

2. Clean the heat box: Dust might accumulate in the heat boxafter long term usage or after serious sandstorm, which mightinfluence the heat exchanging effect. Replace the heat box tokeep the heat exchanger clean.

i. Automatic dust cleaning

If the external circulating fan stops running for 60 minutes,then after the 60 minutes, it will automatically run in fullrate for 3 minutes to clean dust on the heat box. In lowtemperature, this function is disabled when the heater isstarted.

ii. Manual dust cleaning

Press the CLEAN key to make the external circulating fanrun in full rate for 3 minutes, the fan then automaticallyresumes to status before dust is cleaned. Under the dust-cleaning status, press the CLEAN key to resume to statusbefore the dust is cleaned.

3. Clean the heat exchanger cavity.

i. Disconnect the heat exchanger’s power supply. Pull out the–48 V DC connector, 220 V AC connector, and DB9 connec-tor that are connected with the heat exchanger.

ii. Use screwdriver to disassemble cross screws on the coverplate and remove the cover plate.

iii. Use clean cotton thread to clean the inside of heat ex-changer cavity and the fan’s blade.

iv. Clean the heat box gently with clean cotton thread.

v. Clean the waterspout at the bottom of heat exchanger.



vi. Install the cover plate after cleaning is completed, and fas-ten screws.

Normal Result The five alarm indicators on the heat exchanger are green or green(flashing), indicating that the working status is normal.

AbnormalityHandling

If the indicator of a part is red, it indicates that the part isfaulty. For handling details, refer to Analysis and Handling ofHeat Exchanger Faults.

If the heat exchanger does not perform automatic dust clean-ing within specified time, or the heat exchanger has no re-sponse after the CLEAN key is pressed, perform troubleshoot-ing according to operation details described in Analysis andHandling of Heat Exchanger Faults.

Precautions In low temperature, when the heater is started, do not use themanual dust cleaning function randomly, because it might influ-ence the heating effect on internal equipments.

Cable Connection Checking

Checking RF Cable Connection

Prerequisites None

Steps 1. Check RF cable connectors to see whether they are tight, reli-able, and waterproof.

2. Check whether the RF cable is not damaged.3. Check whether the RF cable label is clear.

ReferenceStandard

1. The RF cable connection is reliable and waterproof.2. The RF cable is in good condition.3. The RF cable label is clear.

AbnormalityHandling

If water infiltrates the RF cable, perform waterproof handling. If aRF cable is damaged, replace the RF cable; for operation details,refer to Replacing RF Jumper.

Precautions When performing waterproof handling or replacing the RF cable,turn off the RU’s power supply, and relevant services supported byRU will be interrupted.

Checking GPS Cable Connection

Prerequisites None

Steps 1. Check GPS cable connectors to see whether they are tight,reliable, and waterproof.

2. Check whether the GPS cable is not damaged.3. Check whether the GPS cable label is clear.

ReferenceStandard

1. The GPS cable connection is reliable and waterproof.2. The GPS cable is in good condition.3. The GPS cable label is clear.



AbnormalityHandling

If water infiltrates the GPS cable, perform waterproof handling.If a GPS cable is damaged, replace the GPS cable; for operationdetails, refer to Replacing GPS Jumper.

Precautions None

Semiyearly Maintenance

Biannual Routine Maintenance Items

Table 15 lists the biannual routine maintenance items.

TABLE 15 BIANNUAL ROUTINE MAINTENANCE ITEMS

Category Items

Equipment cleaning Cleaning fan subrack

Board diagnosis and test Board diagnosis and test

Equipment Cleaning

Cleaning Fan Subrack

Prerequisites 1. Tools: clean cotton gauze, antistatic soft brush or dust collec-tor.

2. Standby fan subrack.

Steps 1. Use clean cotton gauze, antistatic soft brush, or dust collectorto clean the fan and circuit board in the standby fan subrack.

2. Use the standby subrack to replace the running fan subrackin the cabinet. For operations details, refer to Replacing FanSubrack.

3. Clean the replaced fan subrack as described in step 1, and thecleaned fan subrack can be used as standby fan subrack.

4. Replace all other running fan subracks in the cabinet and cleanthem as described above.

ReferenceStandard

The fan subrack is clean.

AbnormalityHandling

None

Precautions The process of replacing fan subrack can not exceed 5 minutes.



Board Diagnosis and Test



Steps 1. Log in to the NetNumen M31 client.2. Start the NE agent.3. In Physical View of the Topology Management tab, click

NE Management > Test Management, as shown in Figure17.

FIGURE 17 ENTERING TEST MANAGEMENT

4. In the left equipment view of Test Management, find theBS8900 node.

5. Select the board in BS8900 GU360 to be diagnosed and per-form the test.

ReferenceStandard

After the test is completed, the board color is yellow/green. Clickthe board and the test result is displayed.

The test result is normal.



AbnormalityHandling

Analyze the fault cause according to the test result.

Precautions Before using Test Management, the NE agent must be startedfirst.

Yearly MaintenanceYearly Routine Maintenance Items

Table 16 lists the yearly routine maintenance items.

TABLE 16 YEARLY ROUTINE MAINTENANCE ITEMS

Category Items

Measuring power amplifier’s out-put power

Base station testMeasuring Standing Wave Ratio(SWR)

Board changeover test Testing CC board changeover

Checking lightning protector

Checking grounding cableGrounding lightning protectioncheck Testing grounding resistance

Checking antenna feeder interface

Checking tightness of antenna andtower amplifier

Checking directional antennadowntilt

Antenna feeder system check

Checking waterproof conditionsfor antenna feeder connector andlightning protective grounding clip

Checking iron tower (optional)

Checking pole (optional)

Other checks

Checking running status of bat-teries



BTS Testing

Measuring Power Amplifier’s Output Power

Prerequisites Tools:

1. One 3 1/2 digital multimeter2. One 150 W thru-line wattmeter3. RF cables4. Other metal fittings

Steps 1. Turn off the Radio Unit (RU)’s power supply. The RU’s powerswitch is on the front panel of PDM.

2. Disconnect the power supply and make the RU not outputpower, loosen the antenna feeder cable connectors, and con-nect them with a thru-line wattmeter and a large-power load.

Note:

When the RU is not connected with any antenna, connect it witha 100 Wmicrowave power load. When the RU is connected withantenna, it needs not be connected with any load.

3. Turn on the power supply and add excitation (RU has output).Read the power of the set frequency band (GSM900: 925 MHz~ 960 MHz; GSM1800: 1805 MHz ~ 1880 MHz). In the caseof full power, read the output power and the gain flatness.

4. After the test is completed, disassemble connections amongthru-line wattmeter, large-power load, and the Power Amplifier(PA) output end, restore the connection between PA output endand the antenna feeder cable. Make the RU power on again.

ReferenceStandard

RU60: for GMSK, the maximum cabinet-top output power is47.8 dBm (60 W); for 8PSK, the maximum cabinet-top outputpower is 46.0 dBm (40 W).

RU02: for GMSK, the maximum cabinet-top output power is46.0 dBm (40 W); for 8PSK, the maximum cabinet-top outputpower is 43.5 dBm (22.5 W).

AbnormalityHandling

If the test result is abnormal, check whether power control param-eters at background are set correctly, and check whether RF cableconnections between modules and antenna feeders are reliable.

Common PA faults include PA module (front-end) faults and PAtube (rear-end) faults. They cause low gain and decreased outputpower. If PA is faulty, replace the RU where the faulty PA is located.

Precautions During the measuring process, services supported by the RUshould be interrupted.



Measuring SWR

Prerequisites Site Master

50 Ω SMA (M) matching load

SMA torque spanner

Allen screwdriver

One N(M) -N(M) testing cable

Steps 1. Turn on the power switch of Site Master2. Select OPT in the main menu.3. Select the item to be measured: SWR.4. Select the FREQ key in the main menu, and enter start and

stop scanning frequencies.5. Select the START CAL key to calibrate the measuring instru-

ment as follows:

i. Connect the circuit breaker (OPEN) with TEST PORT, andselect ENTER.

ii. Connect the short-circuit device (SHORT) with TEST PORTand select ENTER.

iii. Connect the 50 Ω load with TEST PORT and select ENTER,the system performs calibration automatically.

6. In SCALE of the main menu, enter the values of TOP, BOTTOM,and LIMIT. To facilitate query, it is recommended to set thevalue of TOP to be 1.5 and BOTTOM to be 1.0.

7. In the FREQ menu, select the MARKER key, and then selectEDIT to edit MARKER to make it show the Standing WaveRatio (SWR) value.

8. Read the values. Examine whether these values meet the re-quirements and then save them.

9. Reconnect connectors of the equipment and restore the sys-tem.

ReferenceStandard

Normal test result: SWR < 1.5

AbnormalityHandling

If the test result is abnormal, use the fault location function (DTF)to find the fault position and fault cause, and perform troubleshoot-ing.

Precautions 1. Each time before power-on for measurement, calibrate themeasuring instrument.

2. If the measurement is conducted during equipment running, itis necessary to notify the customer. Lock relevant sectors orget the customer’s approval, then turn off relevant equipmentpower supply and perform the test. Usually, it is not recom-mended to perform the measurement in this way.

3. During the measurement, observe the equipment’s runningstatus with care.

Testing CC Board Changeover





Steps 1. Log in to the NetNumen M31 client.2. Start the NE agent.3. In Physical View of the Topology Management tab, click

NE Management > Configuration Management, as shownin Figure 18.

FIGURE 18 ENTERING CONFIGURATION MANAGEMENT

4. In the left equipment view of Configuration Management,find the BS8900 node, double-click it to open the rack view.

5. Right-click on the CC board in BS8900 GU360 to perform ac-tive-standby changeover.

ReferenceStandard

The board changeover is normal. Perform the dialing test after theboard changeover, and all services are normal.

AbnormalityHandling

None



Precautions None

Grounding Checking

Checking Lightning Protector

Prerequisites 1. Site Master2. 50 Ω N(F) matching load3. One testing cable4. Adapters N(M)-7/16DIN(M), N(M)-7/16DIN(F)

Steps The following takes the 1/4λ lightning protector for example toexplain the method of examining whether a lightning protector isnormal.

1. Turn off the BS8900 GU360 power supply.2. Loosen the jumper connectors connected to both ends of the

lightning protector.3. Select the START CAL key to calibrate the measuring instru-

ment as follows:

i. Connect the circuit breaker (OPEN) with TEST PORT, andselect ENTER.

ii. Connect the short-circuit device (SHORT) with TEST PORTand select ENTER.

iii. Connect the 50 Ω load with TEST PORT and select ENTER,the system performs calibration automatically.

4. Connect the Site Master to a port on the lightning protector viatesting cable.

5. Connect the other port on the lightning protector with thematching load.

6. Read the Site Master and examine whether the lightning pro-tector’s return loss is within the normal range.

7. Repeat Step 4 through 6 to measure the return loss of the otherport on the lightning protector.

8. Adjust the multimeter to ×10 K to measure the resistance ofconductors in the high-frequency sockets at both ends of thelightning protector.

9. Adjust the multimeter to ×1 to measure the resistance be-tween the conductor in the antenna and the ground.

10. If the test result is normal, connect jumper connectors to thetwo ports on the lightning protector. Power-on the BS8900GU360 to restore the system.

ReferenceStandard

Technical indices of the lightning protector satisfy the productspecifications. The normal test result is larger than 20 dB.

The resistance of conductors in the high-frequency sockets at bothends of the lightning protector is larger than 20 MΩ.

The resistance between the conductor in the antenna and theground is approximately 0 Ω.

AbnormalityHandling

If the test result is abnormal, it is advised to replace the lightningprotector.



Precautions Take care of the grounding connection of the lightning protectorso that they may not be damaged.

Checking Grounding Cable

Prerequisites None

Steps Check each grounding cable to see whether its connectors areloose, rusty or aging.

ReferenceStandard

No connector is loose, rusty or aging.

AbnormalityHandling

Replace the grounding cables and reconnect them.

Testing Grounding Resistance

Prerequisites Prepare the earth resistance tester (model ZC-8) before testingthe grounding resistance.

Steps 1. Disconnect the grounding down-lead from the equipment, andconnect it to the earth resistance tester.

2. Mount two auxiliary piles 20 m and 40 m away from the testingpoint (local voltage/remote current). To ensure good contactbetween the piles and the earth, sprinkle water around them.

3. Connect the two auxiliary piles and the earth resistance tester’sterminals through conducting wire. Shake the handle of thetester to measure the grounding resistance. If the earth re-sistance tester gets power supply from battery, the groundingresistance can be read directly by pressing the button.

ReferenceStandard

Grounding resistance ≤ 5 Ω. In area where the number of thun-derstorm days per year is less than 20, the grounding resistancecan be less than 10 Ω. Measure the grounding resistance accord-ing to the design requirement if there is any.

AbnormalityHandling

1. Check whether the connection between the grounding down-lead and the grounding net is reliable.

2. Check whether the grounding net system satisfies the designrequirement and whether the resistance-reducing agent isadded periodically.

Antenna Feeder System Checking

Checking Antenna Feeder Interface

Prerequisites None

Steps 1. Observe indicators on the backplane to see whether there isany SWR alarm.

2. Check whether the RF cables of the antenna feeder system areaging.

ReferenceStandard

1. Indicators on the backplane show no SWR alarm.2. The RF cables of the antenna feeder system are not aging.



AbnormalityHandling

1. According to the SWR measuring method described in Measur-ing SWR, check SWR of the jumpers, main feeders and anten-nas. Check segment by segment from the combiner’s outputport to locate the faulty parts. Replace the faulty parts untilthe fault is removed.

2. If the RF cables are aging, replace them.

Checking Firmness of Antenna and TowerAmplifier

Prerequisites Prepare the spanner before checking the firmness of antenna andtower amplifier.

Steps 1. Check whether the fixing clips of antennas and antenna sup-ports are reliable.

2. Check whether the fixing clips of the tower amplifier are reli-able.

ReferenceStandard

The fixing clips of antennas and tower amplifiers are reliable, with-out shaking or sliding.

AbnormalityHandling

Use the spanner to tighten the fastening screws.

Checking Directional Antenna Tilt

Prerequisites Prepare the angle gauge before checking a directional antenna’stilt.

Steps Use the rotary angle gauge with a bubble tube to check the tiltof a directional antenna, as shown in Figure 19. If using otherinstrument, refer to the corresponding instrument’s instructions.

FIGURE 19 ANGLE GAUGE

1. Press the angle gauge against the object to be measured, asshown in Figure 20.



FIGURE 20 MEASURING OBJECT WITH ANGLE GAUGE (1)

2. Rotate the dial until the bubble in the tube is located in themiddle of the two indication rings.

3. Read the scale on the dial.

ReferenceStandard

The tilt is consistent with that specified in network planning.

AbnormalityHandling

1. Rotate the dial to the set angle.2. Press the object to be measured against the dial chassis firmly.

Move the object and chassis together until the bubble in thetube moves to the middle of the two indication rings, as shownin Figure 21.

FIGURE 21 MEASURING OBJECT WITH ANGLE GAUGE (2)



Checking Waterproof Status of Antenna FeederConnectors and Lightning Protection GroundingClips

Prerequisites Prepare the following materials before checking the waterproofstatus of antenna feeder connectors and lightning protectiongrounding clips:

Waterproof adhesive

Sealant

Insulating tape

Steps Check whether water leakage or cracks exist on antenna feederconnectors and lightning protection grounding clips.

ReferenceStandard

No water leakage or cracks exist on antenna feeder connectorsand lightening protection grounding clips.

AbnormalityHandling

Perform the following steps to make waterproof treatment:

1. Turn off the power supply of BS8900 GU360.2. Disassemble the existing waterproof materials.3. Wrap the waterproof adhesive at the connector, apply the

sealant, and then wrap the insulating tape. Wrap the tapelayer by layer from bottom to top to avoid rainwater leakage.

4. Make the BS8900 GU360 power on.

Other Checking

Checking Iron Tower

Prerequisites None

Steps Check tower lamps, tower structure distortion, and tower basesinking.

Measure the verticality and height of the iron tower.

Check the degree of tightness of structure bolts. Check thecorrosion-proof and rustproof conditions.

ReferenceStandard

The structure distortion, base sinking, and verticality of the irontower all satisfy the design requirements. The structure bolts arefixed tightly and there is no corrosion or rust on them.

AbnormalityHandling

Perform appropriate handling for abnormality if there is any.

Checking Pole

Prerequisites None

Steps Check the following items:

Installation of the pole fasteners.



Forces on devices including the pole, cables on the guyedtower, and ground anchors.

Corrosion-proof and rustproof conditions.

Pole verticality.

ReferenceStandard

The pole is vertical and tightly fixed, without any corrosion or rust.

AbnormalityHandling

Perform appropriate handling for abnormality if there is any.

Checking Running Status of Batteries

Prerequisites None

Steps Check whether the battery has leakage and whether connectioncables have reliable contact.

ReferenceStandard

There is no battery leakage and the connection is normal.

AbnormalityHandling

Refer to the battery instructions.

Precautions None


C h a p t e r 3

Emergency Maintenance

Table of ContentsOverview..........................................................................49Emergency Process............................................................53Service Recover ................................................................56

OverviewEmergency Maintenance Scenarios

Table 17 lists the application scenarios of BS8900 GU360 emer-gency maintenance.

TABLE 17 FAULT SYMPTOM AND DETAILS

Fault Symptom Fault Details

The service is interrupted at a fewBS8900 GU360.

The service is interrupted at afew BS8900 GU360, all mobilesubscribers in correspondingcoverage areas encountercommunication break or can notaccess the network normally.

The service is interrupted at alarge amount of BS8900 GU360.

The service is interrupted at alarge amount of BS8900 GU360that are mutually associated, a lotof mobile subscribers encountercommunication break or can notaccess the network normally.

Emergency Maintenance Flow

Figure 22 shows the flow of emergency maintenance.



FIGURE 22 EMERGENCY MAINTENANCE FLOW

The emergency maintenance flow include the following steps:

Check Service According to the emergency fault symptom, and through the topol-ogy at Network Management System (NMS) client and reportedalarms, decide whether the fault is caused by site problems andwhether the fault exists in a few sites or a large amount of sites.

Recordabnormality and

locate fault

According to the emergency maintenance flow given in Figure 22,locate the fault and make records in the abnormality record formas shown in Table 1.

TABLE 1 ABNORMALITY RECORD FORM

Record Item Abnormality Details

Emergency fault occurrence time

Emergency fault occurrence range


Chapter 3 Emergency Maintenance

Record Item Abnormality Details

Critical alarm reported

Abnormal performance index

Board with abnormal indicator

Site version number

NMS version number

Operation log information

Status query information

Signaling tracing information

Note:

In case of any emergency fault occurring, record the fault detailsas much as possible to facilitate fault locating.

Analyze fault Perform fault analysis and troubleshooting according to the posi-tion located in previous fault locating.

If the fault is not due to BSS problems, contact relevant mainte-nance personnel to solve the problem.

If the fault is due to BSS problems, perform analysis to decidewhether the fault cause is at BSC or base station, and implementcorresponding handling.

Emergency help If on–site maintenance personnel can not remove the fault, con-tact ZTE Corporation.

Resume service After the fault is located, resume the service as soon as possible.If the fault can not be located immediately, try methods such asboard changeover, resetting board, or replacing board, to resumethe service in time.

Caution:

Before resuming service, maintenance personnel should performsystem data backup. If it is necessary to change hardware config-uration, such as cable connection or board’s slot position, recordthe current condition first.

The procedure of resuming service must be recorded.

Observe resumedservice

Perform the dialing test and performance report statistics, and col-lect subscribers’ complaints, to learn details of service resumption.

After the service is resumed through emergency maintenance,make sure that the system is running normally. Arrange personnelto attend during service peak hours to ensure that problems canbe solved in time if there is any.



Epilogue Summarize the emergency maintenance experience and fill in theemergency troubleshooting record form, and give feedback of thetroubleshooting result to the customer and ZTE Corporation.

Emergency Maintenance Precautions

Precautions The following items should be noticed in the emergency mainte-nance:

Usually, the emergency maintenance has great influence onthe system running. Consequently, it is required that mainte-nance personnel must be familiar with the equipment. Mainte-nance personnel should have certain maintenance experienceor perform the maintenance under the guidance of experiencedmaintenance personnel.

If the fault greatly influences the system running, contact ZTECorporation as soon as possible no matter whether the main-tenance personnel could remove the fault.

Before the emergency maintenance is performed, implementdata backup for the site first.

MaintenanceGuide

Before performing emergency maintenance for BS8900 GU360,the following basic principles of emergency maintenance shouldbe fully considered and followed:

1. The purpose of emergency maintenance is to rapidly resumethe system service. Consequently, the maintenance personnelshould study and grasp the emergency maintenance materialof BS8900 GU360 and related equipments.

2. Maintenance personnel should keep calm in case of any emer-gency service interruption occurring at BS8900 GU360. Con-tact NMS maintenance personnel first, query relevant alarmsat NMS to locate the site where the service interruption occurs.

If the service interruption occurs at a large amount ofBS8900 GU360, check BSCs to which the Abis interface ofthese sites are connected and transmission circuits to seewhether there is any abnormality, such as faulty moduleof faulty board, data modification, or version changes. Ifthe BSC, transmission equipment, and transmission circuithave no problem, then maintenance personnel can go todifferent sites to perform maintenance. NMS maintenancepersonnel should cooperate with the site maintenancepersonnel.

If the service interruption is due to problems at a single site,contact NMS maintenance personnel first to obtain alarminformation of the faulty site to locate the fault range. Taketools and spare parts of the base station to the faulty siteto perform emergency maintenance.

3. After the emergency maintenance is completed, collect equip-ment alarm information related to the fault in time. Send rel-evant troubleshooting report, equipment alarm file, and logfile to ZTE Corporation for further analysis, which helps betterZTE’s after-sale service.



Emergency ProcessAutomatic Active-StandbyChangeover

Redundant backup is adopted in the clock, IQ switching, and trans-mission of BS8900 GU360. If no problem exists in redundantboards:

When one of the control clock modules of BS8900 GU360 be-comes faulty, the system automatically performs cold switch-ing, and the service will be interrupted for about 10 seconds.

When one of the FS network switching module becomes faulty,it only influences the running of the RU connected with it. Forring networking, the system automatically performs switchingto another FS IQ, and the service will be interrupted for about10 seconds.

Manual Active-Standby Changeover

Context The manual active-standby changeover is performed when faultoccurs at the transmission or the clock. The changeover time iswithin 30 seconds.

Steps 1. Log in the local or centralized NMS.

2. Right-click on the main CC board to initiate the active-standbychangeover.

Figure 23 shows the operation in the centralized NMS.



FIGURE 23 OMM ACTIVE-STANDBY CHANGEOVER

Note:

If only one board is configured, then the changeover menu willnot be displayed. If two boards are configured, and one boardis in active status while the other board is in standby status,then the changeover menu will be displayed.

END OF STEPS

Resetting Power-Down Board

Context Perform power-down resetting for the faulty board.

Steps 1. Log in the local or centralized NMS.

2. Right-click on the faulty board to initiate the power-down re-setting.

Figure 24 shows the operation in the centralized NMS.



FIGURE 24 OMM POWER-DOWN RESETTING

END OF STEPS

Checking Whether Fan Is RunningNormally

Context Check whether the fan is running normally.

Steps 1. Log in the local NMS.

2. Right-click on the SA/SE, RTR/DTR/FCE board to initiate theenvironment information query.

3. Check whether the temperature is within the nromal range.Usually, the temperature should be lower than 55.

END OF STEPS



Service RecoverService Resuming Flow

The flow of resuming service is shown in Figure 25.



FIGURE 25 SERVICE RESUMING FLOW



Service Recover Procedure

Checking Whether PM Is Normal

Context Check the PM’s power supply to see whether the cabinet has nor-mal power supply.

Steps 1. On the rack panel, check whether the RUN indicator of PM isgreen, which indicates normal status.

2. If the indicator is abnormal, check the PM board.

END OF STEPS

Repairing Power Supply System

Context Usually, abnormal power supply of the cabinet is caused by faultin the power supply system of the equipment room. Perform thefollowing steps to solve the problem.

Steps 1. To avoid accidents, before the equipment room’s power supplysystem becomes normal, turn off all power switches on thepanel of the power distribution shelf of the cabinet.

2. Repair the power supply system as soon as possible.

END OF STEPS

Checking Power Supply of Main Boards

Context After the cabinet’s power supply becomes normal, check whetherthe main service shelf’s power supply is normal.

Steps 1. On the rack panel, check the RUN indicator of CC to seewhether it is ON, which indicates normal running.

2. On the rack panel, check the RUN indicator of SA/SE to seewhether it is ON, which indicates normal running.

3. If the main service shelf’s power supply is abnormal, i.e. theRUN indicator is OFF, then before finally finding out the faultcause, it is recommended not to perform any operation, in-stead, maintenance personnel should contact ZTE Corporationimmediately to get technical support.

END OF STEPS

Checking Whether Service Boards Run Normally

Context After the cabinet’s power supply becomes normal, check whetherthe power supply of service boards is normal.



Steps 1. On the rack panel, check the RUN indicator of FS to seewhether it is ON, which indicates normal running.

2. On the rack panel, check the RUN indicator of BPC to seewhether it is ON, which indicates normal running.

3. On the rack panel, check the RUN indicator of UBPG to seewhether it is ON, which indicates normal running.

4. Check whether corresponding boards are configured inOMM/LMT.

5. If a board has been configured in OMM/LMT but its RUN indi-cator is OFF, then unplug and plug this board.

6. If the problem persists, replace the board.

END OF STEPS

Resetting/Replacing Board

Context If a board fails, reset it or replace it.

Steps 1. Check whether the RUN indicator of the board is abnormal. Ifthe board is abnormal, the RUN indicator is not green and theAlarm indicator flashes periodically.

2. Log in OMM/LMT to check the current alarms.

3. Perform troubleshooting according to the alarm information.

END OF STEPS

Checking Whether Fault Is due to ConfigurationData Modification

Context If the configuration data is inappropriate or the system patch isloaded incorrectly, then reloading such data and program willcause board fault or system fault.

Steps Perform analysis and comparison of configuration data through theLMT/OMM operation log.

END OF STEPS

Resuming Original Configuration Data

Context If the equipment fault is due to inappropriate configuration data,then resume the original configuration data.

Steps 1. Extract the backup data which is prepared before the operationis performed.

2. Resume the original configuration data.



3. Maintenance personnel can also resume correct configurationdata under the guidance of ZTE technical personnel.

END OF STEPS

Collecting Fault Information

Context Maintenance personnel should collect fault information in time nomatter whether the fault is removed or not. This facilitates furtherfault analysis and locating.

Steps 1. Export the operation log of the current site through LMT.

2. Export current alarms and history alarms of the current site.

3. Export the service failure statistics information of the currentsite through LMT.

4. Export all information under the directory Log of CC-1 andCC-2 of the current site, as shown in Figure 26.

FIGURE 26 EXPORTING FOREGROUND LOG INFORMATION

Note:

Log in the foreground through ftp, both the user name and thepassword are null, ftp>cd /ROOT/log

Extract files under the directory Log to the local machine.

5. Export the abnormal probe information of the current site.

END OF STEPS


C h a p t e r 4

Troubleshooting

Table of ContentsCommon Troubleshooting Process ........................................61Common Service Troubleshooting ........................................63Common Equipment Troubleshooting....................................66

Common TroubleshootingProcessUsually, the troubleshooting process includes the following fourstages:

Collecting fault information

Analyzing fault causes

Locating fault

Removing fault

Collecting FaultInformation

The following lists sources of fault information collection:

Subscribers’ complaints;

Abnormality detected in daily maintenance;

Alarms and notifications reported at NMS client;

Boards’ indicator status.

Maintenance personnel should collect relevant original informationfrom various sources as much as possible.

Analyzing FaultCauses

After the fault information is obtained, maintenance personnel per-form analysis to decide the probability of each fault cause, whichis taken into account in the sequence of troubleshooting.

Locating Fault After the fault cause analysis is completed, maintenance personneluse various troubleshooting methods to exclude impossible faultcauses and decide the real fault causes. The following lists somecommon methods for fault analysis and locating:

Viewing alarms and operation log

Alarms and operation log viewing is performed through alarmmanagement and operation log view interfaces in BSS opera-tion and maintenance system.



The alarm management interface allows viewing and analyz-ing current alarms, history alarms and common notificationsreported by the Network Element (NE). This ensures detect-ing network operation abnormalities in time, locating, isolatingand troubleshooting the fault as early as possible

The operation log in user management allows tracing systemparameter modifications, locating relevant terminals and op-erators, and detecting faults caused by improper operations.

Indicator status analysis

Analyzing indicator status helps in fault detection. Indicatorson the boards are observed to locate the fault position.

This method requires familiarity with status of all indicatorsand their respective meanings.

Performance analysis

This is done in the performance management interface of BSSoperation and maintenance system, through which the BSSperformance management and signaling tracing can be imple-mented.

Through the performance management interface, users cancreate performance measurement tasks, generate various per-formance reports, and understand various performance indicesof BSS. Through such information analysis, maintenance per-sonnel can learn the load distribution in the network and adjustnetwork parameters in time to improve network performance.

Through the signaling tracing interface, users can trace BSS-related signaling (including signaling at Gb interface). It facili-tates checking various signaling flows during the commission-ing and debugging process.

Using analysis tools

During BS8900 GU360 maintenance , the maintenance per-sonnel use testing mobile phone, signaling analyzer, bit erroranalyzer, and other instruments to analyze, locate and trou-bleshoot faults.

Plugging and unplugging

When a fault occurs in a board, loosen the fixing screws on thefront panel, unplug and plug the board and external connec-tors. This method helps ensure good contact or handle abnor-mal processor problems.

Pressing the cable connector after the system is powered offalso helps remove faults due to bad contact.

Comparison and interchange

The comparison method refers to comparing the possibly faultyboard with another normal board in similar condition in thesystem (such as another normal board in the same slot of adifferent module). Compare the running status, jumpers, andcable connections. It can be diagnosed through comparisonwhether the board is faulty.

The interchange method refers to replacing the possibly faultyboard with a spare board or another identical normally-run-ning board. If the fault disappears after replacement, then theboard is faulty.


Chapter 4 Troubleshooting

Note:

When performing fault analysis and fault locating, the oper-ation of plugging or unplugging board might be performed.Maintenance personnel should strictly follow relevant specifi-cations to perform such operations.

Isolation method

When a system component is faulty, relevant boards or shelfcan be separated to judge whether the fault is caused by mu-tual influence.

Self-test

This method refers to fault judgment through self-test afterthe system or board is powered-on again. Generally, duringthe power-on and self-test process, indicators flash accordingto certain rules, which can be used to diagnose whether theboard is faulty.

Contacting ZTE Corporation to get technical support

During the troubleshooting process, if maintenance personnelencounter difficult problems that can not be solved, they cancontact ZTE Corporation via telephone, fax, or e-mail to gettechnical support.

Removing Fault After a fault is located, maintenance personnel perform appropri-ate handling to remove the fault to resume normal system running.

Common ServiceTroubleshootingLow Call Completion Ratio

Fault Symptom Users complain that the call completion ratio (i.e. the ratio of thecalled party being connected) decreases significantly and calls can-not be connected at all in the worst cases.

Fault Analysis The call completion ratio is a basic index to evaluate overall per-formance of the system. There are a lot of factors that may affectit, including:

1. Boards and parts of the access–side equipments (including BTSand BSC) fail; or parts of the core–network–side equipments(such as MSC) fail. Hence, fewer resources are available andusers’ access requests are mostly rejected.

2. Software version mismatch exists among equipments or parts,which is caused by incorrect operations during system upgradeor version update. It influences normal running of the system,causing disorder in the interactive flow of important signaling



or messages. As a result, the user’s access becomes very dif-ficult.

3. Early-stage network planning or network construction is notcomplete or resource configuration is incorrect, causing inap-propriate allocation of system service resources. Resources insome areas are insufficient, especially areas with heavy traffic,which reduces the call completion ratio.

4. Electromagnetic interference, such as the pilot pollution, existsin the propagation environment, causing degradation of Signalto Noise Ratio (SNR), which reduces the call completion ratio

Troubleshooting 1. Set statistics tasks on the performance statistics interface atthe operation and maintenance background, measure the callcompletion ratio in the problem area, and compare the resultwith old statistic data.

2. If the statistics index does not decrease significantly, thenthere is a great probability that external electromagneticinterference exists.

Use a radio signaling analyzer to observe the radio signalingconnection process, and record characteristics of abnormal in-terruptions.

Use a spectrum analyzer to scan the frequency band in use todetect whether there is any external electromagnetic pollution.

Locate the interference source and try to eliminate it.

3. If the statistics index does decrease significantly, then checkequipment faults, resource configuration, and software ver-sions.

i. According to the problem area complained by users, de-termine whether the whole network, a BTS, or a sector isinfluenced.

ii. Query current alarms and history alarms. Check the work-ing status of equipment parts, transmission equipments,and clock source. Eliminate any fault found.

iii. Observe the utilization of relevant resources continuously,for example, the board’s CPU utilization, link load, cell traf-fic, and radio channel utilization. Adjust resource config-uration data and expand the equipment capacity if neces-sary.

iv. Check software/hardware versions of each equipment andpart to eliminate faults due to version mismatch.

4. If performance indices of the whole network degrade, it mightbe a sign that the system is to be down. Handle the problemimmediately, and report it to ZTE Corporation in time.

Poor Call Quality

Fault Symptom The following lists some common symptoms of poor call quality:

1. Call drop: Abnormal interruptions occur frequently during thecall process.

2. Unidirectional call: One party can not hear the other partyduring the call process.



3. Intermittent voice: The voice is intermittent during the callprocess.

Fault Analysis 1. The mobile terminal has poor demodulation performance(receiving sensitivity), and fluctuation of the receiving fieldstrength affects the call quality.

2. Either party or both parties of the call are on the edge of cell(s)or the signal is blocked by landform or buildings, thus the signalfield strength is weak and fluctuates greatly. It results in a highframe error rate, affecting the voice quality.

3. Strong electromagnetic interference exists in the space, includ-ing pilot pollution, carrier interference, and abnormal sectorpower of adjacent BTS. It results in the decreased voice qual-ity.

i. Pilot pollution: When there are three or more pilot frequen-cies with nearly equal magnitude in the coverage area, sur-plus pilot frequencies become a strong interference source.

ii. Carrier interference: In the coverage area, if a frequencythat approximates the BTS’s carrier frequency exists,strong signal interference will be generated. The interfer-ence might be continuous or in a burst.

iii. The power of adjacent BTS’s sector being abnormal: Thepower output of the adjacent BTS’s sector often fluctuatesat an amplitude of over 3 dB, causing interference to cor-responding sectors of other BTS and overlapped soft–han-dover area of adjacent BTS.

4. The user is moving during the call process, when there areobstacles in the surrounding, the signal is blocked suddenly,air links undergo fast fading or the receiving signal strengthundergoes sudden change. Because the rapid power controlfunction can not efficiently take into effect, the continuity ofvoice quality is affected.

5. Resources occupied during the call process, such as carrier,link, board, switching network, and transmission equipment,have faults and do not work stably, affecting the stability ofthe call process.

6. Data configurations are incorrect or versions of hardwareand software do not match, affecting the stability of the callprocess.

Troubleshooting 1. Check the mobile terminal used in the call process. Use multi-ple terminals of different models for comparison if possible, todetermine whether the terminal has any problem.

2. Test the signal field strength in the conversation area to eval-uate the coverage effect. Optimize the network if the signalfield strength in the area is weak.

3. Use instruments to monitor whether there is any pilot pollutionor carrier interference in the area. If so, find out the interfer-ence source and perform appropriate handling.

4. At the operation and maintenance background, query the re-cent downlink power output status of all adjacent BTS. For anyabnormal power output detected, check the corresponding BTSand eliminate relevant fault.

5. If the voice quality degradation occurs only in the movingprocess, then it might be due to that the power control mech-anism can not adapt to the special geographical environmentwhere the call process is proceeded. In this case, networkoptimization should be performed, such as adjusting theantenna.



6. Use a signaling monitoring meter or start signaling tracing atthe operation and maintenance background, perform the dial-ing test on the site to monitor the signaling flow. Query historyalarms and current alarms simultaneously as a supplementarymethod to locate the fault. If the fault can be located to aspecific board or part, then check corresponding data configu-ration and hardware/software versions to eliminate the fault.

Slow to Access the Internet

Fault Symptom The connection speed is relatively slow when the user accessesthe Internet through packet service.

Fault Analysis 1. The downlink radio link signal is of poor quality. For exam-ple, the receiving power at the edge is below -90 dBm, orthe receiving power is high but the downlink Frame Error Rate(FER) is above 10%, causing the downlink rate unable to beincreased.

2. The system resource is insufficient, failing to provide the band-width that high-speed download requires.

3. Equipments other than BS8900 GU360 fail.

Troubleshooting 1. Use instruments to test the receiving power and BER of thedownlink radio link. Perform network optimization if it is re-quired.

2. Check the current occupation and allocation of system re-sources, such as carriers, links, boards and the switchingnetwork, to find out the “bottleneck” of resources. Upgradethe equipment or expand the capacity if condition permits.

Common EquipmentTroubleshootingTemperature of RU Board Being High

Fault Symptom The temperature of the RU board is too high.

Fault Analysis This problem might be due to that the RU board has run with fullpower for a long time but the fan does not work, causing the envi-ronment temperature to become very high, or the detecting circuitis faulty.

Troubleshooting 1. Check whether the fan works normally and whether the envi-ronment temperature is too high.

2. If the fan works normally and the environment temperatureis normal, but the alarm of the RU board’s temperature beinghigh is still reported, then it indicates that the fault might existin the detecting circuit.



B121 DC Power Distribution UnitFault

DC Output VoltageIs Low

Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm. Alarm meaning: the DC output voltage is low; the DCoutput voltage is less than DC Vol.Min. (default: 48 V; range:–41 V ~ –52 V).

Fault analysis

The DC output voltage is low.

The setting of DC Vol.Min. is incorrect.

The detection cable of DC output has problems.

The monitoring unit is faulty.

Other causes.

Troubleshooting

i. Select the DC voltage scale on a multimeter and measurethe voltage between the positive and the negative connect-ing terminal. If the DC output voltage is lower than DCVol.Min., then it is a normal alarm.

ii. Check the setting of DC Vol.Min. on the monitoring unit.If the setting is too high, set it to the default value or avalue required by the customer.

iii. Check whether the detection cable of the positive and thenegative connecting terminal is broken or of bad contact.

iv. If no problem is found in the above steps, the problemmight exist inside the monitoring unit. Replace the moni-toring unit.

v. Contact ZTE Corporation for technical support if the faultpersists.

DC Output VoltageIs High

Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm. Alarm meaning: the DC output voltage is high; theDC output voltage is larger than DC Vol.Max. (default: 58 V;range: 57 V ~ 59 V).

Fault analysis

The DC output voltage is high.

The setting of DC Vol.Max. is incorrect.

The detection cable of DC output has problems.


Other causes.

Troubleshooting



i. Select the DC voltage scale on a multimeter and measurethe voltage between the positive and the negative connect-ing terminal. If the DC output voltage is higher than DCVol.Max., then it is a normal alarm. Check the reasonfor DC over-voltage. Basically, there are two conditions.One is that the fault exists inside the rectifier, causing thehigh output voltage; the other is that the monitoring unitis faulty.

– If it is the fault inside the rectifier that causes high out-put voltage, shut down all the rectifiers first. Then, turnon the first rectifier, and check the output voltage. If theoutput voltage is normal, shut down the first rectifier.Turn on the second rectifier, and check the output volt-age. Check all the rectifiers according to this method,find out the faulty rectifier and replace it, and restartthe system.

– If all the rectifiers work normally, the problem mightexist inside the monitoring unit. Replace the monitoringunit.

ii. If the monitoring unit still gives the DC Over-Vol alarmwhen the voltage between the positive and the negativeconnecting terminal is normal, check the setting of DCVol.Max.. If the setting is too low, set it to the defaultvalue or a value required by the customer.

iii. Check whether the detection cable of the positive and thenegative connecting terminal is broken or of bad contact.

iv. Contact ZTE Corporation for technical support if the faultpersists.

The Load’s Fuse IsBroken

Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm . Alarm meaning: the fuse of load X is OFF; if the load’sfuse is ON, the voltage between the detecting terminal and thenegative connecting terminal is 0 V. If the load fuse is OFF, thevoltage between the detecting terminal and the negative con-necting terminal is 48 V.

Fault analysis

The fuse of the load loop is burned (or the air breaker isOFF).

The detection cable of the load loop is broken or of badcontact.


Other causes.

Troubleshooting

i. It is a normal alarm when the fuse of the load loop is burned(or the air breaker is OFF). Check whether short circuitexists in the load loop, whether the current of the load loopis too high, and whether the capacity of the fuse (or theair breaker) is appropriate (normally, the capacity of DCfuse is 1.5 times or twice of output current of the DC load).Replace the fuse or turn the air breaker ON after the faultis removed.



ii. Check whether the detection cable of the load loop is bro-ken or of bad contact.

iii. If no problem is found in the above steps, the problemmight exist inside the monitoring unit. Replace the moni-toring unit.


The DC LightningProtector IsAbnormal

Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm . Alarm meaning: the DC lightning protector is faulty;check the DC lightning protector’s contact and measure thecontact voltage. If the lightning protector is working normally,the voltage is 12 V; otherwise, the lightning protector hasalarms and the voltage is about 0.7 V.

Fault analysis

The DC lightning protector is damaged.

The detection cable of the DC lightning protector is brokenor of bad contact.


Other cases.

Troubleshooting

i. If any indicator (HL1, HL2, HL3) of the DC lightning pro-tector is not ON, then the lightning protector is faulty, andthe alarm is normal. Handling the case with the followingmethod:

Open the case of the DC lightning protector, check the cor-responding fuse and varistor, and replace the damaged de-vices. (The fuse is most likely to be damaged.)

ii. Check whether the detection cable of the DC lightning pro-tector is broken or of bad contact. Select the DC voltagescale on a multimeter to measure the voltage of the detect-ing terminal. If the lightning protector is working normally,the voltage is 12 V; otherwise, the voltage is about 0.7 V.



The Load’sCircuit BreakerIs Abnormal

Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm . Alarm meaning: the load’s circuit breaker X is abnor-mal (the DC contactor is faulty; after executing the actions of“1st Shut-down” and “2nd Shut-down”, the load’s total currentdoes not decrease evidently (the current is decreased by lessthan 3 A or not decreased at all).

Fault analysis

The DC circuit breaker is damaged.



The connection of DC breaker is disconnected or of badcontact.


Other causes.

Troubleshooting

i. Check whether the DC circuit breaker is damaged.

Select the DC voltage scale on a multimeter and measurethe voltage of the DC circuit breaker. If the voltage is 48V, then it is in good condition. If the voltage is 0 V or verylow, then the DC circuit breaker is faulty. Replace the circuitbreaker.

If the voltage is 48 V, select the Ohm (Ω) scale and mea-sure the resistance of the DC circuit breaker. Normally, theresistance is infinite. If the measured resistance is 0, thenthe DC circuit breaker is faulty, Replace the circuit breaker.

ii. If the voltage is lower than 48 V, check whether the DCcircuit breaker is disconnected or of bad contact.



B121 AC Power Distribution UnitFault

AC Power Is Off Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm. Alarm meaning: The AC input power is OFF and thereis no standby AC input power. The AC input phase voltage isless than 20 V.

Fault analysis

The AC input power is OFF.

The AC transducer is disconnected or of bad contact. TheAC transducer is faulty.


Other causes.

Troubleshooting

i. Check whether the AC input power is cut OFF. If so, it is anormal alarm. The user can determine whether to generateelectricity.

ii. If AC input power is not OFF, check whether the AC trans-ducer’s working voltage (-12 V and +12 V) is normal. Ifnot, check the power supply of corresponding monitoringunit.



iii. If the AC transducer’s working voltage is normal, checkwhether the AC input is properly connected to the AC trans-ducer input.

Select the AC voltage scale on a multimeter and measurethe phase voltage of AC transducer input. If the measuredvoltage is incorrect, then the cable connection between theAC input and the AC transducer input is disconnected.

iv. If the AC input is properly connected to the AC transducerinput, select the DC voltage scale on a multimeter and mea-sure the voltage of the AC transducer output to see whetherit is normal. If not, then the AC transducer is faulty. Re-place the AC transducer.

The ratio of the transducer’s DC output voltage to AC inputvoltage is 1:60. For example, when the transducer workswith the normal voltage (+/-12V), if the AC input phasevoltage is 300 V AC, then the DC output voltage should be5 V DC.

v. If no problem is found in the above steps, the problemmight exist inside the monitoring unit. Replace the moni-toring unit.

vi. Contact ZTE Corporation for technical support if the faultpersists.

AC AuxiliaryOutput Is Off

Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm. Alarm meaning: The air breaker of the AC auxiliary out-put is OFF; check contacts of the air breaker, if the air breakeris ON, then the alarm is normal; otherwise, alarm is reportedwhen the air breaker is OFF.

Fault analysis

The air breaker of the AC auxiliary output is OFF.

Signal cables are disconnected from contacts of the auxil-iary air breaker or of bad contact.


Other causes

Troubleshooting

i. If the air breaker of the AC auxiliary output is OFF, turn itON.

ii. Check whether the connection of the auxiliary air breaker’scontacts is disconnected or of bad contact. If yes, plug thecables again.

iii. Select the Ohm (Ω) scale on a multimeter to measure theresistance between the contacts of the auxiliary air breaker.When the air breaker is ON, the contacts is ON and theresistance is 0. When the air breaker is OFF, the contactsis OFF and the resistance is infinite. If the status of the airbreaker contacts is abnormal, replace the air breaker.





AC Main AirBreaker Is Off

Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm. Alarm meaning: The main air breaker of AC input isOFF; check contacts of the main air breaker, if the air breakeris ON, the alarm is normal; otherwise, alarm is reported whenthe air breaker is OFF.

Fault analysis

The main air breaker of AC input is OFF.

Some signal cables are disconnected from the main airbreaker’s contacts or of bad contact.


Other causes.

Troubleshooting

i. If the air breaker of the AC main input is OFF, turn it ON.

ii. Check contacts of the air breaker.

Select the Ohm (Ω) scale on a multimeter to measure theresistance between contacts of the air breaker. If the airbreaker is ON and the contact is ON, resistance is 0. Ifthe air breaker is OFF and the contact is OFF, resistance isinfinite. If status of the air breaker contacts is not correct,replace the air breaker.

Check whether cables are disconnected from the airbreaker contacts or of bad contact.



AC LightningProtector LoopIs Abnormal

Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm. Alarm meaning: The lightning protector loop is abnor-mal. Check the condition of the contacts of level B+C lightningprotector. If the contact is ON, it is normal. If the contact isOFF, alarm occurs.

Fault analysis

The lightning protector is faulty.

The base of lightning protector is of bad contact.

The detection cable of lightning protector is disconnectedor of bad contact.


Other causes.

Troubleshooting



i. Check the lightning protector module. If window displayof the module is RED, the lightning protector is damaged.Replace the lightning protector.

ii. If the lightning protector module is normal, pull it out andcheck whether the base of the lightning protector is of badcontact.

iii. Check whether connection of the contact on the lightningprotector base is disconnected or of bad contact.

Select the Ohm (Ω) scale on a multimeter and measurethe contact on the lightning protector base. Normally, thecontact is ON and resistance is 0. In abnormal cases, thecontact is OFF and the resistance is infinite.



AC Voltage Is Low Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm. Alarm meaning: Phase voltage is low. Phase voltage <AC Vol. Min. (Default: 154 V; range 80 V ~ 200 V)

Fault analysis

The AC input voltage is low.

The setting of AC Vol. Min. on the monitoring unit isincorrect.

The AC transducer or its connection is faulty.


Other causes.

Troubleshooting

i. If the AC input voltage is lower than AC Vol. Min., it is thenormal alarm.

ii. Check whether the setting of AC Vol. Min. is correct. Ifthe setting is too high, set it to default value or a valuerequired by the customer.

iii. If the setting of AC Vol. Min. is correct, check whetherthe working voltage (+/-12V) of AC transducer is normal.If it is abnormal, check the power supply of correspondingmonitoring unit.

iv. If the working voltage of AC transducer is normal, checkwhether there are line break from AC input to AC transducerinput.

Select the AC voltage scale on a multimeter and measurephase voltage of AC transducer input interface. If the mea-sured voltage is abnormal, then there is line break from ACinput to AC transducer input.

v. If there is no line break from AC input to AC transducer in-put, select the DC voltage scale on a multimeter and mea-sure the phase voltage of AC transducer output interface.



If the measured voltage is abnormal, then AC transduceris faulty. Replace the transducer.

The ratio of the transducer’s DC output voltage to AC inputvoltage is 1:60. For example, when the transducer workswith the normal voltage (+/-12V), if the AC input phasevoltage is 180 V AC, then the DC output voltage of the ACtransducer should be 3 V DC.

vi. If no problem is found in the above steps, the problemmight exist inside the monitoring unit. Replace the moni-toring unit.

vii. Contact ZTE Corporation for technical support if the faultpersists.

AC Voltage Is High Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm. Alarm meaning: Phase voltage is high; the phase volt-age is larger than AC Vol. Max. ( Default: 286 V; range: 240V~ 300 V )

Fault analysis

The AC input voltage is high.

The setting of AC Vol. Max. is incorrect.

The AC transducer or its connection is faulty.


Other causes.

Troubleshooting

i. If AC input voltage is higher than AC Vol. Max., it is thenormal alarm.

ii. Check whether the setting of AC Vol. Max. is correct.If the setting is too low, set it to default value or a valuerequired by the customer.

iii. If the setting of AC Vol. Max. is incorrect, check whetherthe working voltage (+/-12V) of AC transducer is normal.If it is abnormal, check the power supply of correspondingmonitoring unit.

iv. If the working voltage of AC transducer is normal, checkwhether there is line break from AC input to AC transducerinput.

Select the AC voltage scale on a multimeter and measurethe phase voltage of AC transducer input. If the measuredvoltage is abnormal, then there is line break from AC inputto AC transducer input.

v. If there is no line break from AC input to AC transducer in-put, select the DC voltage scale on a multimeter and mea-sure the voltage of AC transducer output . If the measuredvoltage is abnormal, then the AC transducer is faulty. Re-place the AC transducer.

The ratio of the transducer’s DC output voltage to AC inputvoltage is 1:60. For example, when the transducer workswith normal voltage (+/-12V), if the AC input voltage is 300



V AC, then the DC output voltage (Va) of the AC transducershould be 5 V DC.

vi. If no problem is found in the above steps, the problemmight exist inside the monitoring unit. Replace the moni-toring unit.

vii. Contact ZTE Corporation for technical support if the faultpersists.

AC Current Is High Fault symptom

The foreground monitoring unit has visual alarm, the back-ground monitoring unit (if configured) has audible and visualalarm. Alarm meaning: Current of AC input is high; the cur-rent of AC input is larger than AC Cur. Max. (Default: 80 A;range: 45 A ~ 150 A)

Fault analysis

The AC input current is high.

The setting of AC Cur. Max. is incorrect.


Other causes.

Troubleshooting

i. Measure AC input current with a clamp-on ammeter. It isa normal alarm if the measured AC input current is higherthan AC Cur. Max..

ii. Check the setting of AC Cur. Max.. If the setting is too low,set it to default value or a value required by the customer.



B121 Monitoring Unit Fault

Fault Symptom The monitoring LCD has erratic display or illegible code.

Fault Analysis Unconventional voltage fluctuation occurs.

Troubleshooting 1. Press the Reset button to make the monitoring LCD to resumenormal display.

2. Unplug the monitoring unit, then plug it in and reset it.

B121 Rectifier Fault

Table 18 lists the rectifier’s fault symptoms and correspondingtroubleshooting methods.



TABLE 18 RECTIFIER FAULT ANALYSIS AND TROUBLESHOOTING

Fault Symptom Troubleshooting

The rectifier has no DC output,indicators on the panel are all OFF.

1. Check whether the AC inputvoltage of the rectifier isnormal.

2. Check whether thecorresponding air breakswitch of the rectifier is ON.

3. Check whether the input fuseof the rectifier is burned.

The temperature of the main heatradiator inside the rectifier is over85, and the rectifier output isOFF.

1. Check whether obstacle existsin the fan or whether the fanis aging. Remove the obstacleor replace the fan.

2. If the internal circuit of therectifier is faulty, causing toomuch heat, then replace therectifier.

The rectifier’s output iscurrent–limited.

1. Check whether the system isin the charging status, checkthe battery’s charging currentthrough the monitoring unit.

2. Check whether the outputload is short-circuited.

3. Check whether the rectifier isfaulty. If so, replace the faultyrectifier.

The rectifier’s fan is faulty. 1. Check whether the rectifier’sfan rotates.

2. If the rectifier’s fan stops,unplug the rectifier andcheck whether there is anyobstacle in the fan. Removethe obstacle if there is anyand plug the rectifier intothe cabinet again. If the fanstill stops after the rectifier isstarted, replace the fan.

3. If the problem persistsafter the above steps areperformed, replace therectifier.

The rectifier’s average current isabnormal.

1. Measure the output voltage ofeach rectifier to see whetherthey are equal. If not, adjustthe rectifier’s output voltage.

2. If the problem is due to therectifier’s internal circuit fault,repair the rectifier.

3. If the problem is due to therectifier’s bad contact, unplugand plug the rectifier.



Heat Exchanger Fault

Fault Symptom The heat exchanger’s indicator prompts fault, and alarm is re-ported at background.

Fault Analysis The heat exchanger’s power supply is abnormal.

The heat exchanger is faulty, and alarm is reported at back-ground.

The heat exchanger has internal fault, causing alarm reported.

Other causes.

Troubleshooting 1. Check the 3–core power supply connector (DC INPUT) on theheat exchanger to see whether its power supply is normal andwhether the connection is reliable. Select the DC voltage scaleon a multimeter and measure the voltage between pin1 andpin3 of the power supply connector to see whether it is 48 V.If the voltage is not 48 V, check whether the cable connectionbetween the connector and the output copper busbar is dis-connected or loosened; if the voltage is 48 V, check whetherthe connector and the socket are loosened.

2. In the case of the heat exchanger being faulty, the commonfault symptom is that the heat exchanger’s internal/external-circulating fan is faulty, causing the fan to stop rotating, andalarm is reported at background. If the fan stops rotating, re-place the faulty fan. The heat exchanger’s internal circuit beingfaulty also occurs sometimes, but the probability is compara-tively small.

3. The heat exchanger’s internal circuit is faulty (usually, the fanstops rotating), and alarm is reported at background. In thiscase, replace the heat exchanger.

4. If no problem is found in the above steps, contact ZTE Corpo-ration for technical support.

Environment Alarm unable to BeReported

Fault Symptom The foreground monitoring unit has visual alarm, the environmentunit communication is broken, the monitoring unit is disconnectedfrom the environment unit.

Fault Analysis The environment unit configuration of the monitoring unit isincorrect.


Other causes.

Troubleshooting 1. Check the setting of EnvUnit Exist of the monitoring unit, thedefault value is No. When the EMB board is configured, set itto Yes.

2. If the setting of EnvUnit Exist is correct, the problem mightexist inside the monitoring unit. Replace the monitoring unit.

3. If no problem is found in the above steps, contact ZTE Corpo-ration for technical support


C h a p t e r 5

Part Replacement

Table of ContentsReplaceable Part List ..........................................................79Board Replacement............................................................80Subrack Replacement.........................................................88

Replaceable Part ListTable 19 lists parts that can be replaced.

TABLE 19 REPLACEABLE PART LIST

Category Part

RU60

RU02

RU40

CC

UBPG

BPC

FS

SA

PM

Board/Module FA



Category Part

Fan subrack

PDM subrack

Lightning protection subrack

BBU

B121 power supply

Battery

Subrack Heat exchanger

Board ReplacementBoard Replacement Instructions

Table 20 lists the influence of board/module replacement on thesystem.

TABLE 20 INFLUENCE OF BOARD REPLACEMENT ON SYSTEM

Board/Module Functions Influence onSystem

RU RF unit, processingradio signaltransmitting andreceiving.

Replacing RU willcause servicessupported by theRU to interrupt.

PM BBU power module. Replacing PM willcause BBU to poweroff and all services tointerrupt.

CC BBU control and clockboard, implementingbaseband unit controland management,Ethernet switching,and providing systemclock.

Replacing the standbyCC has no influenceon the system.

If no standby CC isavailable, replacingthe active CC willcause all services tointerrupt.

FS BBU fiber switchingboard, providingbaseband fiberinterface betweenbaseband unit and RFunit, implementingbaseband IQ dataswitching andprocessing.

Replacing FS willcause servicessupported by theFS to interrupt.


Chapter 5 Part Replacement

Board/Module Functions Influence onSystem

UBPG/BPC BBU basebandprocessing board,processing physicallayer protocols andframe protocolsdefined by 3GPP.

Replacing UBPG/BPCwill cause servicessupported by thebaseband board tointerrupt.

SA BBU on-site alarmboard.

Replacing SA willcause the equipmentalarm monitoringto interrupt, andall services will beinterrupted too.

If Abis E1 is used,then all services willbe interrupted.

FA BBU fan module. Replacing FA willcause BBU’s fan tostop running, andmonitoring of the fanstatus and systemtemperature will beinterrupted too.

When replacing a board or module, the following items should benoticed:

Record the board/module version number to avoid the problemthat the new board/module is incompatible with the system.

Strictly follow operation specifications to avoid misoperation.

Test or verify relevant functions of the new board/module toensure that the replacement is successful.

When inserting a board/module, align it with the slot and insertit tightly. If a board/module is not inserted tightly, it mightcause electrical interference in equipment running and thencause damage to boards and modules.

Operation personnel should wear antistatic wrist strap or anti-static glove when replacing the board/module. The groundingterminal of the antistatic wrist strap must be grounded reliably.

The average system maintenance (replacement) time is lessthan 0.5 hour.

Replacing RU

Prerequisites Through fault observation and analysis, locate the module faultand decide whether the module should be replaced.

Prepare antistatic bag, moisture-proof bag, carton, and severallabels.

Ensure that the spare part is normal and is of the same typeas the faulty module.



Record RF cable positions on the front panel of the module tobe replaced. After the module replacement is completed, thesecables should be inserted to their original positions.

Wear antistatic wrist strap.

Context For details of influence of board replacement on the system, referto Board Replacement Instructions.

Steps 1. Turn off power supply of the faulty RU. The RU’s power switchis on the front panel of the power distribution subrack.

2. Unplug the RF cable on the RU’s front panel.

3. Loosen the fastening screws on the RU panel, and draw thefaulty module’s handle outwards. When the module is poppedout of the slot, hold the module bottom and pull it out gently.

FIGURE 27 PULLING OUT RU MODULE

1. Fastening screw 2. RU

Note:

Avoid to touch components and circuits of the module withhand.

4. Insert the new module into corresponding slot in the subrack,push the circuit board into the subrack, and then tighten thefastening screws.

5. Make the RU power on.

6. Put the replaced faulty module into the antistatic bag insidemoisture-proof bag. Paste label on the bag, marking the mod-ule type, slot, software version, and fault. Store faulty modulesin the carton according to types. Paste label on the carton foridentification in the future.

END OF STEPS



Postrequisite When the module is being powered on, there will be a certain timefor self-test. If the self-test succeeds, indicators are normal andservices are recovered, then the replacement is successful.

If the module’s self-test fails, in other words, the self-test repeatsor the final display result is abnormal, relevant services are notrecovered, then the replacement fails. Check whether the sparepart is damaged or the replaced module is not faulty. Operationpersonnel can observe alarms at foreground and background tofind the fault cause.

Replacing PM






Steps 1. Pull out the micro switch (handle) on the left of the faulty mod-ule for a certain length.

2. Hold the handle and pull the board out along the guide rails.

FIGURE 28 PULLING OUT PM BOARD

1. PM board 2. Micro switch

Note:


3. Align the new board with the left and right guide rails and insertit until the circuit board is in the correct position.



Note:


4. Hold the micro switch on the left of the module and push it in.Make sure that the micro switch is connected with the lock ofthe subrack reliably.


END OF STEPS

Replacing CC/FS/UBPG/BPC





If replacing the active board, perform active/standbychangeover first to make the standby board become active.

Context The method of replacing FS is similar to that of replacingCC/UBPG/BPC. The following takes replacing FS board for exampleto explain the procedure of board replacement. For details ofinfluence of board replacement on the system, refer to BoardReplacement Instructions.


2. Hold the two handles simultaneously.

3. Pull the board out along the guide rails.



FIGURE 29 PULLING OUT FS BOARD

1. FS board 2. Left micro switch

Note:



Note:




END OF STEPS

Postrequisite When FS is being powered on, there will be a certain time for self-test. If the self-test succeeds, indicators are normal and servicesare recovered, then the replacement is successful.

If the module’s self-test fails, in other words, the self-test repeatsor the final display result is abnormal, relevant services are notrecovered, then the replacement fails. Check whether the sparepart is damaged or the replaced module is not faulty. Operationpersonnel can observe alarms at foreground and background tofind the fault cause.



Replacing SA







2. Hold the handle and pull the board out along the guide rails.

Note:



Note:




END OF STEPS

Replacing FA








Steps 1. Move the locker on the faulty module’s panel to the right.

2. Hold the FA module’s handle and pull the FA module out.

FIGURE 30 PULLING OUT FA MODULE

1. Dustproof component2. FA module

3. Locker

The BBU dustproof component can be pulled out by pulling theFA module’s handle. If it is only required to replace the BBUdustproof component, just hold the handle of the dustproofcomponent to pull it out.

3. Align the new FA module with the upper and lower guide railsof the subrack and push it in. Make sure that the dustproofcomponent is locked tightly in the subrack. Push the new FAmodule into the subrack until hearing the click of the locker,which indicates that the FA module and the dustproof compo-nent are installed reliably.


END OF STEPS



Subrack ReplacementSubrack Replacement Instructions

Table 21 lists the influence of subrack replacement on the system.

TABLE 21 INFLUENCE OF SUBRACK REPLACEMENT ON SYSTEM

Subrack Functions Influence onSystem

PDM subrack Implementing powerdistribution for the RFcabinet and BC8910DC cabinet, andpower switch control.

Replacing the PDMsubrack will cause thecabinet to power offand all services tointerrupt.

Fan subrack Implementing heatdissipation for thecabinet.

Replacing the fansubrack will cause thefan to stop running,but it has no influenceon services.

Lightning protectionsubrack

Implementinglightning protectionfor input/outputsignal.

Replacing thelightning protectionsubrack will causeall services tointerrupt and thealarm monitoring tointerrupt.

B121 power supply Implementing powerconversion andallocation for BC8910AC cabinet.

Replacing the B121power supply willcause the cabinetto power off and allservices to interrupt.

BBU subrack ImplementingAbis/Iub interfacefunctions, signalingprocessing, basebandprocessing, and localand remote operationand maintenance;monitoring workingstatus; reportingalarm information.

Replacing BBU willcause all services tointerrupt.



Subrack Functions Influence onSystem

Battery Standby battery,supporting theequipment runningwhen the equipmentis power off.

If the system adoptsexternal powersupply, then replacingthe battery hasno influence onequipments.

Heat exchanger Implementing heatdissipation for thecabinet

Replacing the heatexchanger has noinfluence on serviceswithin a short periodof time. However,in low temperature,it will influence theheating effect insideequipment.

When replacing a subrack, the following items should be noticed:

Strictly follow operation specifications to avoid misoperation.

Test or verify relevant functions of the new subrack to ensurethat the replacement is successful.

Operation personnel should wear antistatic wrist strap or anti-static glove when replacing the subrack. The grounding termi-nal of the antistatic wrist strap must be grounded reliably.

The average system maintenance (replacement) time is lessthan 0.5 hour.

Replacing B121 Power Supply




Record cable positions on the panel of the module to be re-placed. After the module replacement is completed, these ca-bles should be inserted to their original positions.


Context The BC8910 cabinet AC configuration adopts B121 power supplyto implement power supply conversion and allocation. To replaceB121 power supply, the cabinet should be powered off, which willcause all services to interrupt. Thus permission from relevanttechnical personnel must be obtained before performing the op-eration.

Steps 1. Make the cabinet power off. For power-off operation details,refer to Power-on/off Check in ZXSDR BS8900 GU360 (V4.00)Indoor GSM&UMTS Dual Mode Macro Node B Hardware Instal-lation Guide.



2. Pull out cables at the back of the cabinet. Record the cableconnection positions.

3. Loosen the four fastening screws on the power subrack’smounting flange, hold the subrack bottom, and pull it outgently.

4. Insert the new subrack into the shelf, and tighten the fasteningscrews.

5. Reinstall cables according to recorded cable connection posi-tions.

6. Make the cabinet power on. For power-on operation details,refer to Power-on/off Check in ZXSDR BS8900 GU360 (V4.00)Indoor GSM&UMTS Dual Mode Macro Node B Hardware Instal-lation Guide.

7. Put the replaced faulty module into the antistatic bag insidemoisture-proof bag. Paste label on the bag, marking the typeand fault. Store it in the carton. Paste label on the carton foridentification in the future.

END OF STEPS

Replacing PDM Subrack






Context The DC configuration of RF cabinet and BC8910 cabinet adoptsPDM subrack to implement power distribution inside cabinet. Toreplace the PDM subrack, the cabinet should be power off, whichwill cause all services to interrupt. Thus permission from relevanttechnical personnel must be obtained before performing the oper-ation.

Steps 1. Make the cabinet power off.

For power-off operation details, refer to Power-on/off Check inZXSDR BS8900 GU360 (V4.00) Indoor GSM&UMTS Dual ModeMacro Node B Hardware Installation Guide.

2. Pull out cables at the back of the cabinet. Record the cableconnection positions.

3. Loosen the fastening screws on the subrack’s panel, hold thesubrack bottom, and pull it out gently.

4. Insert the new subrack into the shelf, and tighten the fasteningscrews.



5. Reinstall cables according to recorded cable connection posi-tions.

6. Make the cabinet power on.

For power-on operation details, refer to Power-on/off Check inZXSDR BS8900 GU360 (V4.00) Indoor GSM&UMTS Dual ModeMacro Node B Hardware Installation Guide.


END OF STEPS

Replacing Fan Subrack






Context For details of influence of subrack replacement on the system, re-fer to Subrack Replacement Instructions. The following takes thefan subrack of RC8910 for example to explain how to replace thefan subrack. The fan subrack replacement methods of RC8911 andRC8931 are the same.

Steps 1. Turn off the fan subrack’s power supply. The power switch ison the power distribution subrack’s front panel.

2. Unplug cables on the front panel of the fan subrack.

3. Loosen the fastening screws on the subrack’s panel, use onehand to pull the subrack’s handle out and the other hand tohold the subrack and pull it out gently.



FIGURE 31 PULLING OUT FAN SUBRACK

1. Fan subrack 2. Fastening screw

4. Use the cross screwdriver to loosen screws that fasten the fan.

5. Unplug the socket of the fan’s cables, cut the cable tie, andcarefully take the fan out.

6. Put the replaced fan into the antistatic bag inside moisture-proof bag. Paste label on the bag, marking the type and fault.Store it in the carton. Paste label on the carton for identificationin the future.

7. Use fastening screws to fix the new fan in the fan subrack.Insert the fan’s socket into corresponding position in the fansubrack and fix it with screws.

8. After the fan is installed, recover cables to their original posi-tions.

Caution:

Fan cables must be arranged tidily, otherwise, cables might behit during the fan’s running, causing damage to equipment.

9. Install the fan subrack in the cabinet.

10.Make the fan subrack power on.

END OF STEPS

Postrequisite Observe whether the fan is running normally. If it is, tighten fas-tening screws on the panel of the fan subrack, and the replacementis completed.

Replacing Battery








Context Batteries can be configured in RC8911, RC8931, and PC8910. Fordetails of influence of battery replacement on the system, refer toSubrack Replacement Instructions.

Steps 1. Disconnect the input air break switch of B121 power supply.

2. Unplug the charging/discharging cable between the batteryand B121 power supply, unplug the power cable of the bat-tery’s heating film, and record the cable connection positions.

3. Take the battery from the tray of the battery shelf.

4. Put the spare battery on the tray of the battery shelf.

5. Connect the charging/discharging cable and the power cableof the battery’s heating film according to recorded cable con-nection positions.

6. Connect the input air break switch of B121 power supply.

END OF STEPS

Replacing Heat Exchanger






Context BC8910 adopts the heat exchanger to dissipate heat. For detailsof influence of heat exchanger replacement on the system, referto Subrack Replacement Instructions.

Steps 1. Turn off the heat exchanger’s power supply.

2. Unplug the power cable and the monitoring cable at the sideof the heat exchanger.

3. Loosen the four fastening screws on the heat exchanger’smounting flange, use one hand to pull the heat exchanger’shandle out and the other hand to hold the heat exchanger andpull it out.

4. Fix the spare heat exchanger in the cabinet with fasteningscrews.

5. Connect the power cable and the monitoring cable of the heatexchanger.



6. Turn on the heat exchanger’s power supply.

7. Put the replaced module into the antistatic bag inside moisture-proof bag. Paste label on the bag, marking the type and fault.Store it in the carton. Paste label on the carton for identificationin the future.

END OF STEPS

Postrequisite Observe indicators on the heat exchanger. If status of indicatorsare normal, then the replacement is successful.

Replacing Lightning ProtectionSubrack






Context The lightning protection subrack is installed in the BC8910 cabinet.For details of influence of lightning protection subrack replacementon the system, refer to Subrack Replacement Instructions.

Steps 1. Unplug E1 cable and dry contact cable on the lightning protec-tion subrack. Record the cable connection positions.

2. Loosen the four fastening screws on the lightning protectionsubrack’s mounting flange, use one hand to hold the subrack,and take the subrack out.

3. Fix the spare lightning protection subrack in the cabinet withfastening screws.

4. Connect various cables of the lightning protection subrack ac-cording to recorded cable connection positions.


END OF STEPS



Replacing BBU






Context Replacing the BBU subrack will cause all services to interrupt, thuspermission from relevant technical personnel must be obtained be-fore performing the operation.

Steps 1. Turn off the BBU subrack’s power supply. The power switch ison the front panel of PDM subrack or B121 power subrack.

2. Unplug cables of all boards in the BBU subrack.

3. Loosen the fastening screws on the BBU subrack’s panel, holdthe subrack bottom, and pull it out gently.

FIGURE 32 REPLACING BBU

1. Fastening screw

4. Insert the spare subrack into the shelf, and tighten the fasten-ing screws.

5. Reinstall cables for each board.

6. Make the BBU power on.


END OF STEPS



Postrequisite Observe indicators on each board of the BBU. If the board’s self-test succeeds, indicators are normal and services are recovered,then the replacement is successful.

If the board’s self-test fails, in other words, the self-test repeatsor the final display result is abnormal, relevant services are notrecovered, then the replacement fails. Check whether the sparepart is damaged or the fault is not in the board. Operation per-sonnel can observe alarms at foreground and background to findthe fault cause.


A p p e n d i x A

Data Record Forms

Table of ContentsDaily Maintenance Record Form...........................................97Monthly Maintenance Record Form.......................................99Quarterly Maintenance Record Form................................... 100Biannual Maintenance Record Form.................................... 101Yearly Maintenance Record Form ....................................... 102Part Replacement Data Record Form .................................. 104Emergency Troubleshooting Record Form............................ 105

Daily Maintenance RecordFormBS8900 GU360 maintenance personnel should make the dailymaintenance record form every day. Table 22 shows the dailymaintenance record form.



TABLE 22 DAILY MAINTENANCE RECORD FORM

On-duty Date:

On-duty Time:

Person Hand-ing over theShift: Relief Person:

Current Alarm Records of the BTS

SiteNo.

Alarm De-scription

Time of Oc-currence End Time

Re-marks

History Alarm Records of the BTS

Site No. Alarm Description and Troubleshooting Remarks

History Abnormal Notification Message Records of the BTS

Site No.Abnormal Notification Message De-scription and Troubleshooting Remarks

Real–time Status Abnormality Records of Cells

Site No. Abnormalities and Troubleshooting Remarks

Customer Complaints

Site No.Complaint Description and Trouble-shooting Remarks

Shift Description:

Shift Leader:

Verification:


Appendix A Data Record Forms

Monthly MaintenanceRecord FormBS8900 GU360 maintenance personnel should make the monthlymaintenance record form every month. Table 23 shows themonthly maintenance record form.



TABLE 23 MONTHLY MAINTENANCE RECORD FORM

Maintenance Time: Maintenance Staff:

Check ItemConditionRecord

HandlingMethod Remarks

Cabinet’s powersupply andgroundingcondition

Cabinet’sprotection anddust-proofcondition

Heat exchangerstatus

Trunk cable,fiber, andvariousdata cableconnections

Alarm frequencyanalysis

Record of theWorst Cell

Handling theWorst Cell Remarks

Monthly cellperformancereport dataanalysis

Spare parts

The spare partsare completeand in goodcondition Yes No

Shift Leader:

Verification:

Quarterly MaintenanceRecord FormTable 24 shows the quarterly maintenance record form of BS8900GU360.



TABLE 24 QUARTERLY MAINTENANCE RECORD FORM


Category Check Item Check Result Remarks

The coveragetest result isnormal Yes No

The conversa-tion test resultis normal Yes No

Conversation,coverage, andhandover tests

The handovertest result isnormal Yes No

The fans arerunning nor-mally Yes No

The boards arerunning nor-mally Yes No

Main equipmentcheck

The heat ex-changer is run-ning normally Yes No

The RF cableconnections arenormal Yes No

Cable connec-tion check

The GPS cableconnections arenormal Yes No

Shift Leader:

Verification:

Biannual MaintenanceRecord FormTable 25 shows the biannual maintenance record form of BS8900GU360.



TABLE 25 BIANNUAL MAINTENANCE RECORD FORM



The fan shelf isclean Yes No

Equipmentcleanness

The shutter isclean Yes No

Board diagnosisand test

The test resultis normal Yes No

Shift Leader:

Verification:

Yearly Maintenance RecordFormTable 26 shows the yearly maintenance record form of BS8900GU360.



TABLE 26 YEARLY MAINTENANCE RECORD FORM



Measuring theoutput powerof power ampli-fiers

Output power:

Main equipmentcheck

Measuring theSWR SWR:

Board change-over test

The CC boardchangeover isnormal

Yes No

The lightningprotector is nor-mal

Yes No

The groundingcable is reliable Yes No

Grounding andlightning pro-tection check

Testing thegrounding re-sistance

Grounding re-sistance:

The antennafeeder interfaceis normal

Yes No

The antennatower amplifieris firm

Yes No

The directionalantenna tilt sat-isfies require-ments

Yes NoAntenna feedersystem check

The waterproofconditions ofantenna feederinterface andlightning pro-tective ground-ing clip are nor-mal

Yes No





The iron toweris normal Yes No

The pole is nor-mal Yes No

The transmis-sion equip-ments are run-ning normally

Yes No

Other checks

The batteriesare normal Yes No

Shift Leader:

Verification:

Part Replacement DataRecord FormTable 27 shows the part replacement data record form.



TABLE 27 PART REPLACEMENT DATA RECORD FORM

Module/Cable Replacement Data Record Form

BTS No.: Maintenance Staff:

Board/Ca-ble Type

ModuleSlot/Ca-ble Con-nectionPosition

Time ofFault Oc-currence

Time ofReplace-ment

FaultyMod-ule/Ca-ble Se-rial No.

Replac-ing Mod-ule/Ca-ble Se-rial No.

Emergency TroubleshootingRecord FormTable 28 shows the emergency troubleshooting record form.



TABLE 28 EMERGENCY TROUBLESHOOTING RECORD FORM

Emergency Troubleshooting Record Form

Office name: Handled by:

Time of fault occurrence: Time of fault being solved:

Fault source: Subscriber complaints Alarm system Detected indaily routine maintenance Others

Fault type:

Fault symptom:

Troubleshooting:

Result:

Leader’s comments:


Figures

Figure 1 Fault Management Interface ...................................10

Figure 2 Displaying Current Alarms ......................................11

Figure 3 Viewing Site’s Current Alarms .................................11

Figure 4 Alarm Details Dialog Box ........................................12

Figure 5 Clicking Quick Search Button ..................................13

Figure 6 Setting Query Condition - Location ..........................13

Figure 7 Setting Query Condition - Restore Time....................14

Figure 8 Setting Query Index ..............................................16

Figure 9 Setting Query Time ...............................................16

Figure 10 Setting Query Object ...........................................17

Figure 11 Double-Clicking Statistics Frequency By Alarm

Code................................................................19

Figure 12 Setting Query Condition - Location.........................20

Figure 13 Setting Query Condition - Happen Time..................21

Figure 14 Setting Querying Index ........................................22

Figure 15 Setting Query Time..............................................22

Figure 16 Setting Query Object ...........................................23

Figure 17 Entering Test Management....................................37

Figure 18 Entering Configuration Management.......................41

Figure 19 Angle Gauge .......................................................44

Figure 20 Measuring Object with Angle Gauge (1) ..................45

Figure 21 Measuring Object with Angle Gauge (2) ..................45

Figure 22 Emergency Maintenance Flow................................50

Figure 23 OMM Active-Standby Changeover ..........................54

Figure 24 OMM Power-Down Resetting .................................55

Figure 25 Service Resuming Flow.........................................57

Figure 26 Exporting Foreground Log Information ...................60

Figure 27 Pulling Out RU Module..........................................82

Figure 28 Pulling Out PM Board ...........................................83

Figure 29 Pulling Out FS Board ............................................85

Figure 30 Pulling Out FA Module ..........................................87

Figure 31 Pulling Out Fan Subrack .......................................92

Figure 32 Replacing BBU ....................................................95


Tables

Table 1 Safety Symbols Description....................................... 1

Table 2 Daily Routine Maintenance Items ............................... 9

Table 3 Monthly Routine Maintenance Items ..........................18

Table 4 Quarterly Routine Maintenance Items ........................27

Table 5 Normal Status of RU Panel Indicators ........................29

Table 6 Normal Status of CC Panel Indicators ........................29

Table 7 Normal Status of UBPG (or BPC) Panel Indicators........31

Table 8 Normal Status of FS Panel Indicators.........................31

Table 9 Normal Status of SA Panel Indicators ........................32

Table 10 Abnormal Status of RU Panel Indicators ...................32

Table 11 Abnormal Status of CC Panel Indicators ...................32

Table 12 Abnormal Status of UBPG (or BPC) Panel Indicators...33

Table 13 Abnormal Status of FS Panel Indicators....................33

Table 14 Abnormal Status of SA Panel Indicators ...................34

Table 15 Biannual Routine Maintenance Items .......................36

Table 16 Yearly Routine Maintenance Items...........................38

Table 17 Fault Symptom and Details.....................................49

Table 18 Rectifier Fault Analysis and Troubleshooting..............76

Table 19 Replaceable Part List .............................................79

Table 20 Influence of Board Replacement on System ..............80

Table 21 Influence Of Subrack Replacement on System...........88

Table 22 Daily Maintenance Record Form ..............................98

Table 23 Monthly Maintenance Record Form ........................ 100

Table 24 Quarterly Maintenance Record Form ...................... 101

Table 25 Biannual Maintenance Record Form ....................... 102

Table 26 Yearly Maintenance Record Form........................... 103

Table 27 Part Replacement Data Record Form...................... 105

Table 28 Emergency Troubleshooting Record Form ............... 106


ZXSDR BS8900 GU360 (V4.00) Outdoor GSM&UMTS Dual Mode Macro Node B Maintenance Guide

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Transcript of ZXSDR BS8900 GU360 (V4.00) Outdoor GSM&UMTS Dual Mode Macro Node B Maintenance Guide