ZXSDR BTS&Node B Maintenance Guide v1.0

TAMIN TELECOM

ZXSDR BTS&Node B Maintenance Guide

Version 1.00

ZTE CORPORATION NO. 55, Hi-tech Road South, ShenZhen, P.R.China Postcode: 518057 Tel: (86) 755 26771900 Fax: (86) 755 26770801 URL: http://ensupport.zte.com.cn E-mail: [email protected]

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Copyright © 2011 ZTE CORPORATION.

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Revision History

Revision No. Revision Date Revision Reason

R1.0 20110207 First edition

ZTE MSDoc SN:Iran-Tamin-1.4.1

Contents

About This Manual............................................. I

Safety Instructions............................................ 1 Safety Instructions Overview ........................................... 1

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

Safety Instructions Guideline ........................................... 3

Maintenance Overview ...................................... 7 Purpose......................................................................... 7

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

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

Daily Maintenance ........................................... 11 Daily Routine Maintenance Items .....................................11

Alarm and Notification Check ..........................................12

Checking Alarm Box ...................................................12

Querying and Handling Current Alarms .........................13

Querying and Analyzing Past 24-Hour History

Alarms .............................................................14

Querying Real-Time Status of Each cell.............................16

Analyzing Daily Cell Performance Report Data ...................17

Handling Common Faults ................................................19

Handling Complaints ......................................................19

Monthly Maintenance ...................................... 21 Monthly Routine Maintenance Items .................................21

Analyzing Alarm Frequency .............................................22

Analyzing Monthly Cell Performance Report Data ...............24

Equipment Room Maintenance.........................................26

Checking Temperature................................................26

Checking Humidity.....................................................27

Checking Equipment Room Cleanness...........................27

Main Equipment Maintenance ..........................................27

Checking Cabinet Power Supply ...................................27

Checking Cabinet Grounding .......................................28


Checking Cabinet Protection........................................28

Checking Cabinet's Dustproof Conditions ......................29

Cable Connection Check .................................................29

Checking Trunk Cable Connection ...............................29

Check Fiber Connection ..............................................30

Checking Data Cable and Monitoring Cable

Connections ......................................................30

Spare Part Check...........................................................31

Checking Storage Environment of Spare Parts ...............31

Checking Amount of Spare Parts..................................31

Quarterly Maintenance .................................... 33 Quarterly Routine Maintenance Items ...............................33

Testing Call, Coverage, and Handover...............................34

Equipment Room Maintenance.........................................34

Checking Fire Fighting Conditions ................................34

Checking Burglarproof Net, Doors, and Windows............34

Checking Air Conditioners ...........................................35

Checking Lighting Conditions of Equipment Room ..........35

Checking Sockets in Equipment Room ..........................35

Checking Environment Alarm Collection Devices ............36

Main Equipment Maintenance ..........................................36

Checking Fan's Running Status ....................................36

Checking Board's Running Status.................................36

Cable Connection Check .................................................42

Checking GPS Cable Connections .................................42

Semiyearly Maintenance ................................. 45 Semiyearly Routine Maintenance Items ............................45

Equipment Cleaning .......................................................45

Cleaning Fan Module ..................................................45

Board Diagnosis and Test................................................46

Yearly Maintenance ......................................... 47 Yearly Routine Maintenance Items ...................................47

BTS Testing ..................................................................48

Measuring Output Power of Power Amplifier ..................48

Measuring VSWR .......................................................49

Testing CC Board Changeover .........................................50

Grounding and Lightning Protection Check ........................50

Checking Lightning Protector.......................................50

Checking Grounding Cable ..........................................51

Testing Grounding Resistance ......................................51


Other Checks ................................................................52

Checking Iron Tower ..................................................52

Checking Pole ...........................................................52

Checking Running Status of Transmission

Equipment ........................................................53

Checking Running Status of Batteries ...........................53

Part Replacement ............................................ 55 Board Replacement........................................................55

Board Replacement Instructions ..................................55

Replacing PM ............................................................56

Replacing CC/FS/UBPG/BPC ........................................58

Replacing SA.............................................................59

Replacing FA .............................................................60

Cable Replacement ........................................................61

Cable Replacement Instructions...................................61

Replacing DC Power Cable ..........................................63

Replacing Protective Earth Cable..................................64

Replacing E1/T1 Cable................................................64

Replacing Internal Fiber..............................................65

Replacing Ethernet Cable ............................................66

Replacing SA Panel Cable............................................67

Replacing Dry Contact Cable .......................................68

Replacing RS232 and RS485 Monitoring Cable ...............69

Replacing GPS Jumper................................................70


Maintenance Data Record Forms ................... . . 73 Daily Maintenance Record Form ....................................... 73

Monthly Maintenance Record Form .................................... 74

Quarterly Maintenance Record Form .................................. 75

Semiyearly Maintenance Record Form ............................... 76

Yearly Maintenance Record Form ...................................... 77

Emergency Troubleshooting Record Form ........................... 78

Part Replacement Data Record Form ................................. 79

Figures .......................................................... …81

Tables ........................................................... …83

Glossary ......................................................... …85


Section Summary

Chapter 1, Safety Instructions Gives safety instructions for routing maintenance.

Chapter 2, Maintenance Overview Introduces maintenance items and methods.

Chapter 3, Daily Routine Maintenance

Introduces maintenance items and relevant methods of BTS daily maintenance.

Chapter 4, Monthly Routine Maintenance

Introduces maintenance items and relevant methods of BTS monthly maintenance.

Chapter 5, Quarterly Routine Maintenance

Introduces maintenance items and relevant methods of BTS quarterly maintenance.

Chapter 6, Semiyearly Routine Maintenance

Introduces maintenance items and relevant methods of BTS semiyearly maintenance.

Chapter 7, Yearly Routine Maintenance

Introduces maintenance items and relevant methods of BTS yearly maintenance.

Chapter 8, Part Replacement Introduces methods of part replacement for BTS.

Appendix A, Maintenance Data Record Forms

Gives maintenance record forms of BTS for keeping the equipment maintenance information.

About This Manual

Purpose This manual introduces maintenance methods of ZXSDR BTS&Node B, including routine maintenance and part replacement. It also pro- vides tables for recording equipment maintenance information.

Intended Audience

What Is in This Manual

Maintenance Engineer

This manual contains the following chapters.


This page is intentionally blank.

ZTE MSDoc SN:Iran-Tamin-1.4.1 1

C h a p t e r 1

Safety Instructions

Table of Contents Safety Instructions Overview ............................................... 1 Safety Symbols .................................................................. 1 Safety Instructions Guideline ............................................... 3

Safety Instructions Overview

Only the professional personnel who have received relevant training of BTS&Node B system can operate and maintain the equipment.

The following lists basic requirements for BTS&Node B maintenance personnel: Master fundamental theory of BTS&Node B system.

Be familiar with BTS&Node B equipment principles and

networking.

Acquire certain network optimization skill.

Operation and maintenance of the equipment must follow the local safety regulations to avoid body injuries or equipment damages. The safe instructions given in this manual are supplementary to the local safety regulations.

ZTE shall not bear any liabilities incurred by violation of universal safety operation requirements, or violation of safety standards for designing, manufacturing and equipment usage.

Safety Symbols

Table 1 lists safety symbols and their meanings.


TABLE 1 SAFETY SYMBOLS AND MEANINGS

Safety Symbol Meaning

Universal alarm: General safety precaution.

Electrostatic: Device may be sensitive to static electricity.

Electric shock: There is a risk of electric shock.

High temperature: Surface is hot and may cause personal injury if touched.

Laser: Beware of strong laser beam.

Microwave: Beware of strong electromagnetic field.

Universal alarm symbols comprises of four levels: Danger, Warn- ing, Caution, and Note in descending order of criticality. The safety level description is given on the right of the safety symbol. De- tailed safety level information is given below the safety symbol, in the following format.

Danger:

Indicates an imminently hazardous situation, which, if not avoided, could result in death or serious injury. Limit its use to only extreme situations.

Warning:

Indicates a hazardous situation, which, if not avoided, could result in serious injuries, equipment damages or interruption of major services.

Caution:

Indicates a potentially hazardous situation, which, if not avoided, could result in moderate injuries, equipment damages or partial service interruption.


Note:

Indicates helpful information, which, if ignored, could result in mi- nor injuries, equipment damages or partial service interruption.

Safety Instructions Guideline

Electrical Safety Electric Shock:

Never install or uninstall power cables while they are live. At the instant when the power cable touches a conductor, electric spark or electric arc might be generated, resulting in fire or damage to eyes.

Shut down the power supply before installing or uninstalling a power cable.

Before connecting cables, make sure that the cables and cable labels match the practical installation conditions.

Warning:

Drilling in the cabinet without prior permission is prohibited. Un- necessary drilling can damage cables inside the cabinet. The metal pieces blown in during drilling can cause short circuits in the circuit board.

Static Electricity Electrostatic:

Static electricity produced by human body can damage electrostatic-sensitive components on the circuit board, such as Large Integrated Circuits (LIC).

Friction caused by human body is the root cause of electrostatic charge accumulation. In a dry environment, the static voltage carried by human body can be up to 30 kV and can remain in human body for a long time. Person carrying static charge can damage a component by touching it and hence transferring the charge to the component.

To prevent human body's static charge from damaging sensitive components, wear the antistatic wrist strap and ground its other end before touching the equipment or holding a plug-in board, circuit board, or IC chip etc.


Laser

Laser:

Do not stare at the laser beam from the optical terminal or the laser beam inside the optical fiber; otherwise human eyes would be injured.

High Temperature

Danger:

The temperature of some components' surface is quite high. Do not touch the surface to avoid a scald injury.

Fans

Warning:

Keep fingers or tools away from the running fan blades unless the fan is powered off and fan blades stop running. Keep your fingers or body away from any component that is still running.

While replacing components, put screws, tools and components in a safe place. Do not let them fall into the running fan to avoid damaging the fan or relevant devices.

While replacing devices near the fan, keep fingers or boards away from the fan to avoid human injuries or device damages.

Hoisting Weights

Warning:

Make sure that no one stays or walks under the hoisted weight.

To disassemble, move, or replace a heavy equipment, make sure that facilities with proper hoisting capability are available.

Personnel performing the hoisting task must have received proper training. Before the hoisting operation is performed, the hoisting tools must be checked and be complete.

Make sure that the hoisting tools are firmly fixed on the support frame or the wall.

Use short command to avoid misoperation.


Plugging/Unplug-

ging a Module Here, modules include boards and subracks.

Caution:

Operators must wear the antistatic wrist strap.

Do not plug in a board with great force as it might bend the pins at the backplane.

Insert the module along the slot to avoid the circuit surface of modules touching each other lest there is any short circuit.

While holding a module, do not touch its circuits, components, connectors, and wiring trough.

The RF module is very hot during the running process, operators must be very careful in plugging/unplugging it to avoid a scald injury.

Personnel

Caution:

Non-professionals can not perform maintenance inside the equipment unless under the instructions of professionals on the site.

Replacing any part or altering the equipment might result in un- expected dangers. Therefore, do not replace any part or alter the equipment unless being authorized. To ensure your safety, contact ZTE in case of any queries.


C h a p t e r 2

Maintenance Overview

Table of Contents Purpose ............................................................................ 7 Methods ............................................................................ 7 Precautions........................................................................ 8

Purpose

Routine maintenance means checking the equipment status periodically to find and solve problems in time to prevent potential damages or faults.

Methods

The following methods are used in routine maintenance for base stations. Alarm and notification check

Query equipment alarms and notifications at background, perform analysis to determine whether there is anything abnormal, and implement appropriate handling.

Equipment running status check

Query the base station's running status at background, such as the cell's real-time status, perform analysis, and implement appropriate handling.

Performance index check

Query various performance indices of the base station at background, analyze these indices, and implement appropriate handling.

Main equipment check

Check the base station equipment's running conditions, such as the equipment's power supply and the board's running status.

Cable connection check

Check various cable connections and make sure that cable labels are pasted appropriately.


Grounding and lightning protection check

Check the base station's lightning protection system and the grounding system to make sure that they are reliable.

Antenna feeder system check

Check the feeder cable connection of the base station's antenna feeder system, the waterproof condition, and the antenna downtilt.

Spare part check

Check the amount of the spare parts and the storage environment.

BTS testing

Perform the coverage test and the handover test for the base station, measure the base station's power and VSWR, and handle problems in time 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 in time.

Equipment cleaning

Clean the equipment periodically to avoid dust accumulating and guarantee the equipment's normal running.

Precautions

The following items should be noticed during routine maintenance:

1. Ensure the temperature and humidity in equipment room are normal, keep the environment clean, and take dustproof measure and moisture-proof measure.

2. Ensure the stability and reliability of the primary power supply, and check the system ground and lightning protection ground periodically. Before stormy season and after thunder storms, check the lightning protection system to make sure all facilities are in good conditions.

3. Regulate the routine work of maintenance personnel. Keep a detailed duty log to provide details about system operation, version, data change, upgrading, and troubleshooting on day-to-day basis for subsequent analysis and troubleshooting in case a fault occurring. Keep a shift record to specify the responsibility clearly.

4. Maintenance personnel should be trained to grasp certain knowledge related to equipment and network before performing the routine maintenance. During maintenance operations, it is necessary to follow the instructions described in related manuals of BTS&Node B. Before touching the equipment, maintenance personnel must wear antistatic wrist strap to avoid accidents.


Chapter 2 Maintenance Overview

5. It is strictly forbidden to run the signaling tracing program during daytime when the traffic is heavy. Signaling tracing can only be performed in low-traffic hours with permission by the local ZTE office.

6. Check the spare parts periodically to guarantee that they are in good conditions without being affected by moisture. Keep the spare parts separate from those faulty parts and label them for identification. Make sure that there is sufficient stock of commonly used spare parts.

7. Handle fault as soon as possible. Contact the local ZTE office for any problem that cannot be resolved.

8. Place the local ZTE office's contact information at a visible place and make it known to all maintenance personnel. Update the contact information in time.


C h a p t e r 3

Daily Maintenance

Table of Contents Daily Routine Maintenance Items .........................................11 Alarm and Notification Check ..............................................12 Querying Real-Time Status of Each cell.................................16 Analyzing Daily Cell Performance Report Data .......................17 Handling Common Faults ....................................................19 Handling Complaints ..........................................................19

Daily Routine Maintenance Items

Table 2 lists the daily routine maintenance items.

TABLE 2 DAILY ROUTINE MAINTENANCE ITEMS

Category Check Items Alarms and notifications

Checking the alarm box

Querying and handling current alarms

Querying and analyzing the past 24-hour history alarms

Querying and analyzing the past 24-Hour history notifications

Running status Querying real-time status of each

cell Performance indices Analyzing daily cell performance

report data

Troubleshooting

Handling common faults

Handling complaints

Chapter 3 Daily Maintenance


Alarm and Notification Check

Checking Alarm Box

The alarm box prompts faults during the equipment's running in multiple forms, including sound, light, LCD display, short message, or file transmission. The NetNumen M31 server sends the equipment alarm message to the alarm box through TCP/IP.

Prerequisites 1. The NetNumen M31 server program is started. 2. The NetNumen M31 client program is started. 3. The equipment is configured with the alarm box.

Steps 1. Check whether the communication between the alarm box and the NetNumen M31 server is normal.

i. At NetNumen M31 client, check whether the alarm box'scommunication status is normal.

ii. At the alarm box, check whether the network connection icon in the LCD screen is in the connection status.

2. Check the alarm box for audible and visual alarm and check whether the buttons function normally.

Normal Result 1. In the alarm box list in NetNumen M31, the alarm box's communication status is normal. At the alarm box, the network connection icon in the LCD screen is .

2. The alarm box's audible and visual alarm function is normal and the buttons function normally.

Abnormality Handling

1. Log in to the NetNumen M31 server. Execute the ping command to check whether the alarm box's IP address can be accessed. Check whether the alarm box is physically connected in the network. If the IP address can not be accessed, check whether the network cable is normal, and check the alarm box's IP address setting. If the alarm box's IP address and the NetNumen M31 server's IP address are not in the same network segment, Telnet the alarm box to set the alarm box's route.

2. Check whether the alarm box's IP address/TCP port number set at the NetNumen M31 server is consistent with that set at the alarm box.

3. Check whether the port number set at the alarm box has been used by other services at the NetNumen M31 server. If it is, modify the alarm box's port number.

4. If the network connection icon in the LCD screen at the alarm box is in the connection status but the alarm box's communication status is abnormal at NetNumen M31 interface, then check whether the alarm box is also set at other NetNumen M31 servers. If it is, delete such connections, and the communication status will become normal.

5. If the alarm box's audible and visual alarm and buttons function abnormally, contact the alarm box vendor for repair.

Precautions None



Querying and Handling Current Alarms

Prerequisites

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

Connections between the NetNumen M31 server and network elements are normal.

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

FIGURE 1 FAULT MANAGEMENT INTERFACE

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

FIGURE 2 DISPLAYING CURRENT ALARMS



4. View the site's current alarms in the right pane, as shown in

Figure 3.

FIGURE 3 VIEWING SITE'S CURRENT ALARMS

Reference Standard


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

Double-click an alarm to obtain the alarm details in the Details dialog box, and handle the alarm according to suggestions given in the Maintenance Suggestion tab in the dialog.

Precautions None

Querying and Analyzing Past 24-Hour History Alarms

Prerequisites

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



3. Click Query > View History Alarms, the History Alarm Query Conditions tab appears on the right. 4. In the History Alarm Query Conditions tab, click the Quick Search button, as shown in Figure 4.



FIGURE 4 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 5.

FIGURE 5 SETTING QUERY CONDITION - LOCATION

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



FIGURE 6 SETTING QUERY CONDITION - RESTORE TIME

Reference Standard


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

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

Perform analysis for abnormal alarms and alarms that frequently occur. Find out causes for these alarms and handle frequently occurring alarms in time.

Precautions None

Querying Real-Time Status of Each cell

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


Steps 1. Log in to the NetNumen M31 client. 2. Start the NE agent.



Reference Standard


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

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

The channel status in the cell is normal, and there is no blocked channel. There are traffic channels being occupied in real time.

For sites with blocked channels, perform handling according to the site alarms reported in Fault Management. For sites without channel occupation or sites with abnormal channel occupation (for example, channel is released once being occupied), perform handling according to information obtained in Fault Management and signaling tracing.

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

Analyzing Daily Cell Performance Report Data

Prerequisites Communication between the NetNumen M31 client and the

NetNumen M31 server is normal. Connections between the NetNumen M31 server and network

elements are normal. 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. Select the Query Index tab, set Ne Type to be IBSCMEIDand Object Type to be CellFunction(GSM). Select indices or

measurement types to be queried, as shown in Figure 7.



FIGURE 7 SETTING QUERY INDEX

5. In the Query Time tab, select Daily Summary, as shown in Figure 8.

FIGURE 8 SETTING QUERY TIME

6. In the Query Object tab, select the cell to be queried, as shown in Figure 9.



FIGURE 9 SETTING QUERY OBJECT

Reference Standard


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

All performance indices in the query result are normal.

Perform appropriate handling according to the abnormal indices in the performance report.

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

Handling Common Faults

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

Handling Complaints

Perform test for complained faults and handle them appropriately.


C h a p t e r 4

Monthly Maintenance

Table of Contents Monthly Routine Maintenance Items .....................................21 Analyzing Alarm Frequency .................................................22 Analyzing Monthly Cell Performance Report Data ...................24 Equipment Room Maintenance.............................................26 Main Equipment Maintenance ..............................................27 Cable Connection Check .....................................................29 Spare Part Check...............................................................31

Monthly Routine Maintenance Items

Table 3 lists the monthly routine maintenance items.

TABLE 3 MONTHLY ROUTINE MAINTENANCE ITEMS

Category Check Items

Alarms and notifications Analyzing alarm frequency Performance indices Analyzing monthly cell perform-

ance report data Equipment room

Checking temperature

Checking humidity

Checking equipment room cleanness

Main equipment

Checking cabinet power supply

Checking cabinet grounding

Checking cabinet protection

Checking cabinet's dustproof conditions

Cable connections

Checking trunk cable connection

Check fiber connection

Chapter 4 Monthly Maintenance


Category Check Items Checking data cable and monitor-

ing cable connections

Spare parts

Checking the storage environment of spare parts

Checking the amount of spare parts

Analyzing Alarm Frequency




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 10.

FIGURE 10 DOUBLE-CLICKING STATISTICS FREQUENCY BY ALARM CODE

5. Set query conditions in the Parameter Input Box-Statistics Frequency By Alarm Code dialog box. Select System Type and Location for the site to be queried, as shown in Figure 11.



FIGURE 11 SETTING QUERY CONDITION - LOCATION

6. Select Happen Time and set it to be the past one month, as shown in Figure 12.



FIGURE 12 SETTING QUERY CONDITION - RESTORE TIME

Reference Standard


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

The alarm frequency query result is normal. Perform analysis for alarms that occur frequently.

Precautions In the List of Report Templates tab, user can also select other

template to perform query and analysis for history alarms.

Analyzing Monthly Cell Performance Report Data






2. Click View > Performance Management, the Performance

Management interface appears.

3. Click Performance Management > Performance data query, the Query dialog box appears.

4. Select the Query Index tab, set Ne Type to be IBSCMEID and Object Type to be CellFunction(GSM). Select indices or measurement types to be queried, as shown in Figure 13.

FIGURE 13 SETTING QUERY INDEX

5. In the Query Time tab, select Monthly Summary, as shown in Figure 14.

FIGURE 14 SETTING QUERY TIME



6. In the Query Object tab, select the cell to be queried, as

shown in Figure 15.

FIGURE 15 SETTING QUERY OBJECT

Reference Standard


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

All performance indices in the query result are normal.

Perform appropriate handling according to the abnormal indices in the performance report.

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

Equipment Room Maintenance

Checking Temperature

Prerequisites None

Steps Record the temperature on the thermometer.

Reference Standard

Working temperature range: -15 ~ 50 In normal cases, the environment temperature in equipment room must be between 15 and 30. If the environment temperature in equipment room can not satisfy the above requirement for a long time, check or replace the air conditioning system in the equipment room.



Abnormality

Handling Check whether the air conditioner works normally.

Checking Humidity

Prerequisites None

Steps Observe the humidity on the hygrometer.

Reference Standard


Long-term relative working humidity: 5% ~ 95%

In normal cases, the relative humidity in equipment room must be between 40% and 65%.

If the relative humidity in equipment room is too large, install dehumidifier in the equipment room. If the relative humidity in equipment room is too small, install humidifier in the equipment room.

Check whether the air conditioner works normally.

Checking Equipment Room Cleanness

Prerequisites None

Steps Check the equipment room to see whether the ground, cabinet, doors and windows, equipment files, and the insides of equipment are clean.

Reference Standard


All equipments are clean and tidy, without obvious dust.

If there is a lot of dust, it indicates that dustproof conditions in the equipment room are poor. Clean the equipment room and take relevant dustproof measures.

Precautions None

Main Equipment Maintenance

Checking Cabinet Power Supply

Prerequisites Prepare a multimeter for testing the power supply.

Steps 1. Check power input terminals of the power supply module to see whether they have normal sizes and good contact. Check whether there is any problem of corrosion, over-current, or over-temperature.



Reference Standard


2. Check power input terminals and power sockets of each component inside the cabinet to see whether they have normal sizes and good contact. Check whether there is any problem of corrosion, over-current, or over-temperature.

3. Use the multimeter to measure the power supply module's input voltage. Check whether the power cable is aging.

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

2. There is no equipment that has distorted appearance or the problem 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.

If the DC power supply is abnormal, check whether there is any alarm of the power supply. Perform troubleshooting according to the alarm indicator meanings and power supply equipment instructions. Replace the DC power cable if it is aging.

Precautions None

Checking Cabinet Grounding

Prerequisites Prepare a grounding resistance tester before checking the cabinet grounding.

Steps 1. Check connection terminals and fastening screws of all grounding cables inside the cabinet to see whether they have good contact. Check whether there is any problem of loosening or corrosion.

2. Use the grounding resistance tester to measure grounding resistance of the equipment room or the outdoor grounding point.

Reference Standard


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

2. The joint grounding resistance is less than 5 Ω. For special design, the grounding resistance satisfies the design requirement.

Replace damaged grounding cables or connection terminals, and fasten the screws. If the equipment room's grounding resistance does not satisfy the design requirement, check whether the grounding downlead is firmly connected with the grounding network.

Precautions None

Checking Cabinet Protection

Prerequisites None



Steps 1. Check the cabinet top and inside to see whether there is any

object that is not the cabinet's component.

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

Reference Standard


1. On the cabinet top and inside the cabinet, there is no object that is not the cabinet's component.

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

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

Precautions None

Checking Cabinet's Dustproof Conditions

Prerequisites Prepare dry cotton gauze and dust collector before checking the cabinet's dustproof conditions.

Steps 1. Use clean and dry cotton gauze to clean the cabinet's shell. Use dust collector to clean the air inlet at the cabinet bottom.

2. Disassemble the cabinet's dustproof net and wash it with clean water. Assemble the dustproof net into cabinet after it is dried.

Reference Standard


1. There is no dust on the cabinet's shell and at the air inlet at the cabinet bottom.

2. The dustproof net is clean.

None

Precautions None

Cable Connection Check

Checking Trunk Cable Connection

Prerequisites None

Steps 1. Check whether the trunk cable connectors are tight and reliable.

2. Check whether the trunk cable is not damaged.

3. Check whether the cable label is clear.

Reference Standard

1. The trunk cable connection is reliable.

2. The trunk cable is not damaged.

3. The cable label is clear.



Abnormality

Handling 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 service.

Check Fiber Connection

Prerequisites None

Steps 1. Check whether fiber connectors of the transmission subrack are tight and reliable.

2. Check whether the fiber is not damaged.


Reference Standard


1. The fiber connection is reliable.

2. The fiber is not damaged.


Replace the fiber if it is damaged. For operation details, refer to Replacing Internal Fiber. Use clear cable label.

Precautions If it is necessary to replace the fiber, the service will be interrupted.

Checking Data Cable and Monitoring Cable Connections

Prerequisites None

Steps 1. Check whether the cable connectors are tight and reliable.

2. Check whether the cable is not damaged.


Reference Standard


1. The cable connection is reliable.

2. The cable is not damaged.


Replace the cable if it is damaged. For operations details, refer to Replacing Dry Contact Cable and Replacing RS232 and RS485 Monitoring Cable. Use clear cable label.

Precautions None



Spare Part Check

Checking Storage Environment of Spare Parts

Prerequisites None

Steps Periodically check the spare part storeroom for the temperature, humidity, fireproof condition, moisture-proof condition, dustproof condition, antimagnetic condition, shockproof condition, and ventilation.

Reference Standard

The spare part storeroom environment satisfies ZTE communication equipment storage requirements.

Precautions None

Checking Amount of Spare Parts

Prerequisites None

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

Reference Standard


1. According to the equipment hardware configuration, each type of board should have one spare board at least, and the CMB board should have two spare boards at least.

2. All spare parts should be kept in good conditions, without corrosion or damage.

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

Precautions None


C h a p t e r 5

Quarterly Maintenance

Table of Contents Quarterly Routine Maintenance Items ...................................33 Testing Call, Coverage, and Handover...................................34 Equipment Room Maintenance.............................................34 Main Equipment Maintenance ..............................................36 Cable Connection Check .....................................................42

Quarterly Routine Maintenance Items

Table 4 lists the quarterly routine maintenance items.

TABLE 4 QUARTERLY ROUTINE MAINTENANCE ITEMS


BTS test

Testing call, coverage, and handover

Equipment room

Checking fire fighting conditions

Checking burglarproof net, doors, and windows

Checking air conditioners

Checking lighting conditions of the equipment room

Checking sockets in the equipment room

Checking environment alarm collection

Main equipment

Checking the fan's running status

Checking the board's running status

Cable connections Checking GPS cable connections

Chapter 5 Quarterly Maintenance


Testing Call, Coverage, and Handover

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 without call drop occurring, and the base station's coverage range is normal.


Perform appropriate handling for problems found in the test.

Precautions None

Equipment Room Maintenance

Checking Fire Fighting Conditions

Prerequisites None

Steps 1. Check the power distribution cabinet, BTS&Node B cabinet, shelves, and cable troughs.

2. Check fire fighting apparatus in the equipment room, including the water supply system, fire hydrant, alarm system, and fire extinguisher.

Reference Standard


1. All parts are in good conditions, without hidden troubles of fire fighting.

2. All fire fighting apparatus in the equipment room are in good conditions, the fire extinguisher has normal pressure and is within the period of validity.

If a fire fighting apparatus is damaged, repair or replace it in time.

Precautions None

Checking Burglarproof Net, Doors, and Windows

Prerequisites None



Steps Check the burglarproof net, doors, and windows in the equipment

room.

Reference Standard


The burglarproof net, doors, and windows are in good conditions.

If there is anything damaged in the burglarproof net, doors, or windows, repair it in time.

Precautions None

Checking Air Conditioners

Prerequisites None

Steps Check the air conditioner's running status in the equipment room. Clean the air conditioner's dustproof net periodically.

Reference Standard

Abnormality

Handling

The air conditioner is running normally. The ventilation system of the air conditioner's outdoor unit is normal.

Repair the air conditioner that works abnormally in time.

Precautions None

Checking Lighting Conditions of Equipment Room

Prerequisites None

Steps Check the daily lighting system and emergency lighting system in the equipment room.

Reference Standard


Lighting conditions in the equipment room are normal. If there is any damaged lighting device, repair it in time.

Precautions None

Checking Sockets in Equipment Room

Prerequisites None

Steps Check sockets in the equipment room to see whether they are normal.

Reference Standard


All sockets in the equipment room are normal. If there is any damaged socket, repair it in time.



Precautions None

Checking Environment Alarm Collection Devices

Prerequisites None

Steps Check environment alarm collection devices in the equipment room to see whether they are normal. Such devices include those for detecting temperature, humidity, fire alarm, power supply, and burglarproof purpose.

Reference Standard


All environment alarm collection devices in the equipment room are working normally.

If there is any damaged environment alarm collection device, repair it in time.

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 fan alarm in Fault Management.

2. Check whether the fan in the FA module of BBU is running normally.

Reference Standard

Abnormality

Handling

All fans work normally with even rotational speed and without alarms.

If the fan is faulty, replace the fan subrack or replace the fan. For operation details, refer to Replacing FA.

Precautions When checking the fan's running status, do not put the finger into the fan.

Checking Board's Running Status

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



Steps 1. Check indicators on panels of CC, UBPG (or BPC), FS, and SA,

to see whether there is any alarm.

2. Check whether the panel indicator indicates alarm but no alarm is reported in Fault Management at the NetNumen M31 client.

Reference Standard

All boards are running normally, without any alarm.

1. Table 5 lists normal status of indicators on CC panel.

TABLE 5 NORMAL STATUS OF INDICATORS ON CC PANEL

Name Color Meaning

Description

HS Blue Board extraction indicator

ON: Indicates that the board can be extracted.

Flashing: Indicates that the board is being activated or being deactivated.

OFF: Indicates that the board can not be extracted.

RUN Green Running indicator

Constantly ON: The board is being reset.

Flashing at 1 Hz: The board is running in normal status.

E0S Green 0th ~ 3rd E1/T1 status indicator

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

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

The third second: flashing twice, indicating that the 1st line is normal.

The fifth second: flashing three times, indicating that



Name Color Meaning

Description the 2nd line is

normal.

The seventh second: flashing four times, indicating that the 3rd line is normal.

The indicator is displayed in this way in a 8-second cycle.

E1S Green 4th ~ 7th E1/T1 status indicator

Same as above


Same as above


Same as above

MS Green Active/standby status indicator

ON: The board is in active status.

OFF: The board is in standby status.

REF Green GPS antenna status or 2 MHz status indicator (corresponding to different connections of SMA interface on board panel)

Constantly ON: Indicates that the antenna feeder is normal.

Constantly OFF: Indicates that the antenna feeder and the satellite are normal and being initialized.

ETH0 Green Abis/Iub interface link status indicator

Constantly ON: Indi- cates that the Abis/Iub network/electrical/optical interface physical links are normal.

Flashing: Indicates there are data being



Name Color Meaning

Description transceived at

Abis interface.

ETH1 Green ETH1 network interface link status indicator

ON: Indicates that the network interface physical link is normal.

Flashing: Indicates there are data being transceived at DBG/CAS/OMC network interface.

2. Table 6 lists normal status of indicators on UBPG (or BPC)

panel.

TABLE 6 NORMAL STATUS OF INDICATORS ON UBPG (OR BPC) PANEL

Name Color Meaning

Description








3. Table 7 lists normal status of indicators on FS panel.



TABLE 7 NORMAL STATUS OF INDICATORS ON FS PANEL

Name Color Meaning

Description








MS Green Active/standby status indicator

ON: The board is in active status.

OFF: The board is in standby status.

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

TABLE 8 NORMAL STATUS OF INDICATORS ON SA PANEL

Name Color Meaning

Description







Flashing at 1 Hz: The board



Name Color Meaning

Description is running in

normal status.

Abnormality

Handling 1. Table 9 lists abnormal status of indicators on CC panel.

TABLE 9 ABNORMAL STATUS OF INDICATORS ON CC PANEL

Name Color Meaning

Description


OFF: Indicates the self-test fails.

ALM Red Alarm indicator ON: Indicates that the board has alarm.

REF Green GPS antenna status or 2 MHz status indicator (corresponding to different connections of SMA interface on board panel)

Flashing at 1 Hz: The antenna feeder is disconnected.

Flashing at 2 Hz: The antenna feeder is normal but can not receive the satellite signal.

Flashing at 0.5 Hz: The antenna is short- circuited.

Flashing at 5 Hz: No message is received at initialization.

ETH0 Green Abis/Iub interface link status indicator

OFF The Abis network interface physical link is disconnected.

ETH1 Green ETH1 network interface link status indicator

OFF The DBG/CAS/OMC network interface physical link is disconnected.

2. Table 10 lists abnormal status of indicators on UBPG (or BPC)

panel.



TABLE 10 ABNORMAL STATUS OF INDICATORS ON UBPG (OR BPC) PANEL

Name Color Meaning

Description




3. Table 11 lists abnormal status of indicators on FS panel.

TABLE 11 ABNORMAL STATUS OF INDICATORS ON FS PANEL

Name Color Meaning

Description




4. Table 12 lists abnormal status of indicators on SA panel.

TABLE 12 ABNORMAL STATUS OF INDICATORS ON SA PANEL

Name Color Meaning

Description




Precautions None

Cable Connection Check

Checking GPS Cable Connections

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.



Reference Standard


3. Check whether the GPS cable label is clear.

1. The GPS cable connection is reliable.

2. The GPS cable is in good condition.

3. The GPS cable label is clear.

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

Precautions None


C h a p t e r 6

Semiyearly Maintenance

Table of Contents Semiyearly Routine Maintenance Items ................................45 Equipment Cleaning ...........................................................45 Board Diagnosis and Test....................................................46

Semiyearly Routine Maintenance Items

Table 13 lists the semiyearly routine maintenance items.

TABLE 13 SEMIYEARLY ROUTINE MAINTENANCE ITEMS


Equipment cleaning Cleaning fan module

Board diagnosis and test Board diagnosis and test

Equipment Cleaning

Cleaning Fan Module

Prerequisites

1.

Tools: clean cotton gauze, antistatic soft brush or dust collector.

2. Standby fan subrack Steps 1. Use clean cotton gauze, antistatic soft brush, or dust collector

to clean the fan and circuit board in the standby fan module.

2. Use the standby fan module to replace the running fan module in the cabinet. For operations details, refer to Replacing FA.

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

Reference Standard

The fan module is clean.


Abnormality

Handling None

Precautions The process of replacing fan module can not be longer than 5 min-

utes.

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 Agent > Test Management.

4. In the left equipment view of Test Management, find the SDR node. 5. Select the board in BTS&Node B to be diagnosed, and test.

Reference Standard


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

The test result is normal.

Analyze the fault cause according to the test result.

Precautions Before using Test Management, the NE agent must be started

first.


C h a p t e r 7

Yearly Maintenance

Table of Contents Yearly Routine Maintenance Items .......................................47 BTS Testing ......................................................................48 Testing CC Board Changeover .............................................50 Grounding and Lightning Protection Check ............................50 Other Checks ....................................................................52

Yearly Routine Maintenance Items

Table 14 lists the yearly routine maintenance items.

TABLE 14 YEARLY ROUTINE MAINTENANCE ITEMS


BTS test

Measuring output power of power amplifier (optional)

Measuring Voltage Standing Wave Ratio (VSWR) (optional)

Board changeover test Testing CC board changeover Grounding and lightning protection check

Checking lightning protector

Checking grounding cable

Testing grounding resistance Other checks

Checking running status of transmission equipment

Checking iron tower (optional)

Checking pole (optional)

Checking battery


BTS Testing

Measuring Output Power of Power Amplifier

Prerequisites Tools:

1. One 3 1/2 digital multimeter

2. One 150 W thru-line wattmeter

3. RF cables

4. Other metal fittings Steps 1. Turn off the Radio Unit (RU)'s power supply. The RU's power

switch is on the front panel of PDM. 2. Disconnect the power supply and make the RU not output

power, loosen the antenna feeder cable connectors, and connect them with a thru-line wattmeter and a large-power load.

Note:

When the RU is not connected with any antenna, connect it with a 100 W microwave power load. When the RU is connected with antenna, it needs not be connected with any load.

Reference Standard


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 case of full power, read the output power and the gain flatness.

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

RSU60: For GMSK, the maximum cabinet-top output power is 49 dBm (80 W); for 8PSK, the maximum cabinet-top output power is 47 dBm (50 W).

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

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

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

Chapter 7 Yearly Maintenance


Measuring VSWR

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 Master. 2. 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, and

Reference Standard


select ENTER.

ii. Connect the short-circuit device (SHORT) with TEST PORT and 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 the value of TOP to be 1.5 and BOTTOM to be 1.0.

7. In the FREQ menu, select the MARKER key, and then select EDIT to edit MARKER to make it show the peak value of Standing Wave Ratio (SWR).

8. Read the values. Examine whether these values meet the requirements and then save them.

9. Reconnect connectors of the equipment and restore the system.

Normal test result: VSWR < 1.5

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

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

2. If the measurement is conducted during equipment running, it is necessary to notify the customer. Lock relevant sectors or get the customer’s approval, then turn off relevant equipment's power supply and perform the test. Usually, it is not recommended to perform the measurement in this way.

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



Testing CC Board Changeover




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

4. In the left equipment view of Configuration Management, find the SDR node, double-click it to open the rack view. 5. Select the CC board to perform active-standby changeover.

Reference Standard

Abnormality

Handling

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

None

Precautions None

Grounding and Lightning Protection Check

Checking Lightning Protector

Prerequisites

1.

Site Master

2. 50 Ω N(F) matching load

3. One testing cable 4. Adapters N(M)-7/16DIN(M), N(M)-7/16DIN(F)

Steps The following takes the 1/4λ lightning protector for example to explain the method of examining whether a lightning protector is normal.

1. Turn off the power supply of BTS&Node B.

2. Loosen the jumper connectors connected to both ends of the lightning protector.

3. Select the START CAL key to calibrate the measuring instrument as follows:

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



Reference Standard


ii. Connect the short-circuit device (SHORT) with TEST PORT and 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 via testing cable.

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

6. Read the Site Master and examine whether the lightning protector's return loss is within the normal range.

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

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

9. Adjust the multimeter to ×1 to measure the resistance between the conductor in the antenna and the ground.

10. If the test result is normal, connect jumper connectors to the two ports on the lightning protector. Power-on the BTS&Node B to restore the system.

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

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

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

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

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

Checking Grounding Cable

Prerequisites None

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

Reference Standard


No connector is loose, rusty or aging. Replace the grounding cables and reconnect them.

Testing Grounding Resistance

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



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

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

3. Connect the two auxiliary piles and the earth resistance tester's terminals through conducting wire. Shake the handle of the tester to measure the grounding resistance. If the earth resistance tester gets power supply from battery, the grounding resistance can be read directly by pressing the button.

Reference Standard


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

1. Check whether the connection between the grounding downlead and the grounding net is reliable.

2. Check whether the grounding net system satisfies the design requirement and whether the resistance-reducing agent is added periodically.

Other Checks

Checking Iron Tower

Prerequisites None Steps Check tower lamps, tower structure distortion, and tower base

sinking. Measure the verticality and height of the iron tower.

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

Reference Standard


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

Perform appropriate handling for abnormality if there is any.

Checking Pole

Prerequisites None Steps Check installation of the pole fasteners.

Check forces on devices including the pole, cables on the guyed tower, and ground anchors.

Check corrosion-proof and rustproof conditions.



Reference Standard

Abnormality

Handling

Check the pole's verticality.

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

Perform appropriate handling for abnormality if there is any.

Checking Running Status of Transmission Equipment

Prerequisites None

Steps Observe indicators on the transmission equipment to see whether there is any alarm.

Reference Standard


No alarm is reported.

Refer to User Guide of the transmission equipment for fault handling details.

Checking Running Status of Batteries

Prerequisites None

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

Reference Standard


There is no battery leakage and the connection is normal. Refer to the battery instructions.

Precautions None


C h a p t e r 8

Part Replacement

Table of Contents Board Replacement............................................................55 Cable Replacement ............................................................61

Board Replacement

Board Replacement Instructions

Table 15 lists the influence of board/module replacement for BTS&Node B on the system.

TABLE 15 INFLUENCE OF BOARD REPLACEMENT ON SYSTEM

Board/Module Functions Influence on System

PM BBU's power module Replacing PM will cause BBU to power off and all services to interrupt.

CC BBU control and clock board, implementing baseband unit control and management, Ethernet switching, and providing system clock.

Replacing the standby CC has no influence on the system.

If no standby CC is available, replacing the active CC will cause all services to interrupt.

FS BBU fiber switching board, providing baseband fiber interface between baseband unit and RF unit, implementing baseband IQ data switching and processing.

Replacing FS will cause services supported by the FS to interrupt.

UBPG/BPC BBU baseband processing board,

Replacing UBPG/BPC will cause services

Chapter 8 Part Replacement


Board/Module Functions Influence on System

processing physical layer protocols and frame protocols defined by 3GPP.

supported by the baseband board to interrupt.

SA BBU on-site alarm board

Replacing this board will cause the equipment alarm monitoring to interrupt, and all services will be interrupted too.

If Abis E1 is used, then all services will be interrupted.

FA BBU fan module Replacing this board will cause BBU's fan to stop running, and monitoring of the fan status and system temperature will be interrupted too.

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

Record the board/module version number to avoid the problem that 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 to ensure that the replacement is successful.

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

Operation personnel should wear antistatic wrist strap or antistatic glove when replacing the board/module. The grounding terminal of the antistatic wrist strap must be grounded reliably.

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

Replacing PM

Prerequisites

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

Prepare antistatic bag, moisture-proof bag, carton, and several labels.

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

Wear the antistatic wrist strap.



Context For details of influence of board replacement on the system and

relevant precautions, refer to Board Replacement Instructions.

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

2. Hold the handle and pull the board out along the guide rails. FIGURE 16 PULLING OUT PM BOARD

1. PM board 2. Micro switch

Note:

During this process, do not touch components and circuits of the module with hand.

3. Align the new board with the left and right guide rails and insert it 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 subrack's latch reliably.

5. Put the replaced faulty module into the antistatic bag inside moisture-proof bag. Paste label on the bag, marking the module type, slot, software version, and fault. Store faulty modules in the carton according to types. Paste label on the carton for identification in the future.

END OF STEPS



Replacing CC/FS/UBPG/BPC

Prerequisites




Wear the antistatic wrist strap. If the active board is to be replaced, perform active-standby

changeover first to make the standby board become active. Context The method of replacing FS is similar to that of replacing

CC/UBPG/BPC. The following takes replacing FS board for example to explain the procedure of board replacement. For details of influence of board replacement on the system, refer to Board Replacement Instructions.

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

2. Hold the two handles simultaneously.

3. Pull the board out along the guide rails. FIGURE 17 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 services are recovered, then the replacement is successful.

If the module’s self-test fails, in other words, the self-test repeats or the final display result is abnormal, relevant services are not recovered, then the replacement fails. Check whether the spare part is damaged or the replaced module is not faulty. Operation personnel can find the fault cause by observing alarms at fore- ground and background.

Replacing SA

Prerequisites




Wear the antistatic wrist strap. Context For details of influence of board replacement on the system and


Steps 1. Pull out the micro switch (handle) on the left of the faulty mod-

2.

ule for a certain length.

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

Note:





Note:




END OF STEPS

Replacing FA

Prerequisites




Wear the antistatic wrist strap. Context For details of influence of board replacement on the system and


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.

1. Dustproof component 2. FA module

3. Latch

The BBU dustproof component can be pulled out by pulling the FA module's handle. If it is only required to replace the BBU



dustproof component, just hold the handle of the dustproof component to pull it out.

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


END OF STEPS

Cable Replacement

Cable Replacement Instructions

Table 16 lists the influence of cable replacement for BTS&Node B on the system.

TABLE 16 INFLUENCE OF CABLE REPLACEMENT ON SYSTEM

Cable Name Functions Influence on System

External power cable The external power cable connects external power supply to BTS&Node B.

Replacing this cable will cause the system to power off and all services to interrupt.

Protective Grounding Cable

The protective grounding cable connects the equipment and the grounding network, protects the equipment from electrostatic damage, and guarantees reliable equipment running.

Replacing this cable has no influence on system services.

E1/T1 cable The E1 cable is the transmission cable between BTS&Node B and RNC/BSC.

Replacing this cable will cause all services to interrupt.



Cable Name Functions Influence on System

Internal fiber The internal fiber connects service signal and control signal for BBU and RU. Each RU has one pair of fibers connecting with BBU.

Replacing the fiber of a RU will cause services supported by the RU to interrupt.

Ethernet cable When the base station and BSC are based on IP bearer, the Ethernet cable is used as the transmission medium at Abis/Iub interface.

Replacing this cable will cause all services to interrupt.

SA panel cable The SA board is used for input of E1/T1 signal, dry contact input/output signal, and serial port (RS232/RS485) signal of external equipments. These signals are joined by the SA panel cable into one interface and then are led into the system.

Replacing this cable will cause the equipment alarm monitoring to interrupt.

If Abis E1 is used, then all services will be interrupted.

Dry contact cable The dry contact cable inputs external equipment's dry contact signal and outputs the equipment's dry contact signal.

Replacing this cable will cause the equipment's dry contact alarm to interrupt.

RS232/RS485 monitoring cable

The RS232/RS485 monitoring cable connects external monitoring equipments.

Replacing this cable will cause the equipment alarm monitoring to interrupt.

GPS jumper The GPS jumper is used when GPS signal is taken as clock source.

Replacing the GPS jumper does not influence system services within a short period of time.

When replacing cable, the following items should be noticed: Strictly follow operation specifications to avoid misoperation.

Before replacing a cable, record the cable position.

After the cable is replaced, test or verify relevant system functions to ensure that the replacement is successful.

Operation personnel should wear antistatic wrist strap or antistatic glove when replacing the cable. The grounding terminal of the antistatic wrist strap must be grounded reliably.



The average system maintenance (replacement) time is less

than 0.5 hour.

Replacing DC Power Cable

Prerequisites Wear the antistatic wrist strap.

Make sure that the new power cable is of the same type as the old one, and both have the same length.

Context The external power cable is used to connect the BTS&Node B

cabinet and the external power cabinet. There are two external power cables: the blue –48 V power input cable, the black power grounding cable.

Steps 1. Record the power cable's connection positions at the external power cabinet.

2. Make sure that the power supply branch output is disconnected.

3. Disassemble connections between the power cable and the external power cabinet.

4. Disassemble connections between the power cable and the BTS&Node B cabinet.

Note:

The power cable connecting terminal at the BTS&Node B cabinet is located at the power distribution subrack.

5. Cut the cable tie and take out the old power cable.

6. Connect the new power cable with the external power cabinet according to recorded connecting positions. Reserve certain length at the other end of the power cable.

7. Lay the new power cable to the BTS&Node B cabinet according to the old power cable layout.

The power cable and the protective grounding cable must be bound and laid separately with other cables. When cabling outside of the cable rack, also bind them every 200 mm separately. Reserve 0.2 m ~ 0.5 m at the two ends of the cable.

8. Lead the blue –48 V power input cable and the black power grounding cable into cabinet through the cabinet-top cable inlet, and lay them to the power distribution subrack along the vertical cable trough on the right of the cabinet.

9. Install the –48 V power input cable and the power grounding cable on the connecting terminals in the power distribution subrack.



Note:

Connect the power cable according to cable label. Make sure not to connect the power cable inversely.

10. After the cable replacement is completed, put away replaced cables.

END OF STEPS

Postrequisite Connect the power supply branch output, and make the

BTS&Node B cabinet power on.

Replacing Protective Earth Cable

Prerequisites Make sure that the new Protective Earth (PE) cable has the same length as the old one.

Context The customer is responsible for building the infrastructure of grounding system, the grounding project of iron tower and buildings, and connection points of indoor/outdoor grounding copper bars. Engineering personnel on the site is responsible for installing the PE cable of the BTS&Node B cabinet shell.

Steps 1. Record the PE cable's connecting position at the PE terminal in the equipment room.

2. Disassemble connections between PE cables and the equipment room's PE.

3. Disassemble connections between PE cables and PE binding posts on the BTS&Node B cabinet top.

4. Cut the cable tie and take the old PE cable out. 5. Connect the new PE cable with the equipment room's PE termi-

nal according to recorded connecting position. Reserve certain length at the other end of the PE cable.

6. Lay the new PE cable to the BTS&Node B cabinet according to the old PE cable layout.

7. Install the PE cable on the PE binding post on the cabinet top.


END OF STEPS

Replacing E1/T1 Cable

Prerequisites


Make sure that the new E1/T1 cable is of the same type as the old one.



Context Usually, the trunk cable fault has large influence on the system

running, thus the faulty cable should be replaced immediately.

Steps 1. Decide the new trunk cable type.

The trunk cable can be E1 coaxial cable or E1/T1 twisted pair. Before the cable replacement, make sure that the new trunk

cable is of the same type as the old one. 2. Disassemble the faulty cable. Use flathead screwdriver to disassemble the fastening screws

between the trunk cable connectors and interfaces, and remove the cable connectors.

3. Lay and bind the new trunk cable. Cut the cable tie, take the old trunk cable out, and put in the

new trunk cable. During the cable binding process, follow the trunk cable binding specifications.

4. Install the new trunk cable. 5. Check the trunk cable replacement result. Check whether boards related to the replaced trunk cable work

normally, and whether relevant alarms are reported in Fault Management.

6. Paste the trunk cable label. Paste the trunk cable label. Make sure that the label of the

new trunk cable is same as that of the old one. 7. After the cable replacement is completed, put away replaced

cables.

END OF STEPS

Replacing Internal Fiber

Prerequisites Make sure that the new fiber is of the same type as the old one.

Context The internal fiber is used for signal interaction between BBU and RU. Single-mode fiber is used between BBU and RU. The following items should be noticed in replacing fiber:

Do not damage the fiber's protection layer.

Protect the fiber connector against being polluted.

When extracting the old fiber and binding the new fiber, do not use strong force.

Bend the new fiber in arc form at the bend. Steps 1. Paste temporary label on the new fiber. Paste temporary labels at the two ends of the new fiber to form

corresponding relationship. If there are more than one fibers to be replaced, mark the label to distinguish them. 2. Lay the new fiber. The layout position and cabling mode of the new fiber is the same as those of the old one.



3. Extract the old fiber's connector at RU, and insert the new

fiber's connector.

Note:

Extract one connector of the old fiber, cover the optical interface with protective cap to protect it against being polluted. Insert the new fiber's connector and tighten it.

4. Extract the old fiber's connector at RU, and insert the new fiber's connector.

According to the old fiber's serial number, find the other connector of the old fiber and extract it. According to the new fiber's temporary label, find the other connector of the new fiber and insert it.

Note:

Extract one connector of the old fiber, cover the optical interface with protective cap to protect it against being polluted. Insert the new fiber's connector and tighten it.

5. Check the fiber replacement result.

Check whether boards related to the replaced fiber work normally, and whether relevant alarms are reported in Fault Man- agement.

6. Bind the new fiber.

Cut the cable tie, take the old fiber out, and put in the new fiber. During the fiber binding process, follow the fiber binding specifications.

7. Paste the fiber label.

Remove the temporary label on the new fiber and paste the fiber label. Make sure that the new fiber's label is same as the old fiber's.

8. After the fiber replacement is completed, put away replaced fibers.

END OF STEPS

Replacing Ethernet Cable

Prerequisites


Make sure that the new Ethernet cable is of the same type as the old one.

Context BTS&Node B has three types of Ethernet cable according to cable functions.



When the base station and base station controller are based on IP bearer, the Ethernet cable is used as the transmission

medium at Abis/Iub interface.

When BBUs are cascaded, the Ethernet cable functions as the transmission media of cascading signals.

When users log in through the LMT software, the Ethernet cable is used as O&M cable.

Steps 1. Disassemble the faulty cable. Press the Ethernet cable connector and pull out the Ethernet cable. 2. Lay and bind the new Ethernet cable. Cut the cable tie, take the old Ethernet cable out, and put in the

new Ethernet cable. During the cable binding process, follow the Ethernet cable binding specifications.

3. Install the Ethernet cable, insert the cable connector into the Ethernet cable interface.

4. Check the Ethernet cable replacement result. Check whether boards related to the replaced Ethernet cable

work normally, and whether relevant alarms are reported in Fault Management.

5. Paste the Ethernet cable label. Paste the Ethernet cable label. Make sure that the new Ether- net cable's label is same as the old one's. 6. After the cable replacement is completed, put away replaced cables.

END OF STEPS

Replacing SA Panel Cable


The SA panel is configured.

Make sure that the new SA panel cable is of the same type as the old one.

Context The SA panel cable leads the E1/T1 signal, dry contact input/out-

put signal, and external equipment serial port (RS232/RS485) signal into the cabinet. For SA panel cable, the end connecting with BTS&Node B is DB25 connector (End A), while the other end is 1–to-4 connector (DB44 connector, DB9 connector, DB25 connector, and OT terminal) (End B).

Steps 1. Paste label on the new cable.

According to cable terminal and sequence, paste label on the new cable. Make sure that the new label is the same as that on the old cable.

2. Connect End B of the new cable.



i. Disassemble one connector of the old cable's End B, and

connect with the cable connector (with the same sequence and color) of the new cable's End B.

ii. Repeat the previous operation to disassemble another connector of the old cable and connect with a new cable connector, until all new cable connectors are connected.

Note:

Make OT terminal of the SA panel cable's End B ground to the nearest grounding point.

3. Take out the old cable.

i. Cut the cable tie.

ii. Pull out the old cable's End A.

iii. Take out the old cable.

4. Replace the SA panel cable.

i. Lay the new cable according to the old cable's cabling di- rection and sequence. During the cable binding process, follow the Ethernet cable binding specifications.

ii. Connect the new cable's End A to corresponding socket on the SA panel and fix it.

5. Check the cable replacement result.

Check whether boards related to the replaced cable work normally, and whether relevant alarms are reported in Fault Man- agement.


END OF STEPS

Replacing Dry Contact Cable


The SA panel and SA panel cables are configured.

Make sure that the new dry contact input/output cable is of the same type as the old one.

Context The dry contact input cable is used to lead in the dry contact signal of the external equipments. The end connecting with BTS&Node B is SCSI50 connector (End A), while the other end with serial number is End B.

End A is connected with the DB25 connector of the SA panel cable (1–to-4).




According to cable terminal and sequence, paste label on the new cable. Make sure that the new label is the same as that

on the old cable. 2. Connect End B of the new cable. i. Disassemble one connector of the old cable's End B, and







4. Lay the new dry contact input/output cable.


ii. Connect the new cable's End A to the SA panel cable and fix it.




END OF STEPS

Replacing RS232 and RS485 Monitoring Cable


The SA panel and SA panel cables are configured.

Make sure that the new RS232 and RS485 monitoring cable is of the same type as the old one.

Context The RS232 and RS485 monitoring cable is used to connect external

monitoring equipments. The end connecting with BTS&Node B is DB9 connector (End A), while the other end contains two bare wires (End B).

End A is connected with the DB9 connector of the SA panel cable (1–to-3).





on the old cable. 2. Connect End B of the new cable. i. Disassemble one connector of the old cable's End B, and







4. Lay the new RS232 and RS485 monitoring cable.


ii. Connect the new cable's End A to the SA panel cable and fix it.




END OF STEPS

Replacing GPS Jumper


Make sure that the new GPS jumper is of the same type as the old one.

Context The GPS jumper leads the satellite signal into the cabinet. It

connects the BTS&Node B cabinet-top GPS lightning protector and CC board.



on the old cable. 2. Extract the old GPS jumper's connector on the cabinet top, and

insert the new GPS jumper's connector. 3. Take out the old cable.




ii. Extract the old cable's connector on CC board.


4. Lay the new GPS jumper.

i. Lay the new GPS jumper along the vertical cable trough in the left of the cabinet to the CC board in baseband layer.

ii. Insert the new GPS jumper's connector.

5. Check the GPS jumper replacement result.

Check whether boards related to the replaced GPS jumper work normally, and whether relevant alarms are reported in Fault Management.

6. After the GPS jumper replacement is completed, put away replaced jumpers.

END OF STEPS


A p p e n d i x A

Maintenance Data Record Forms

Table of Contents Daily Maintenance Record Form ......................................... 105 Monthly Maintenance Record Form ..................................... 106 Quarterly Maintenance Record Form................................... 107 Semiyearly Maintenance Record Form ................................ 108 Yearly Maintenance Record Form ....................................... 109 Emergency Troubleshooting Record Form ............................ 110 Part Replacement Data Record Form .................................. 110

Daily Maintenance Record Form

BTS&Node B maintenance personnel should make the daily maintenance record form every day. Table 17 shows the daily maintenance record form.

TABLE 17 DAILY MAINTENANCE RECORD FORM

On-duty Date:

On-duty Time:

Person Hand- ing over the Shift:

Relief Person:

Current Alarm Records of the BTS

Site No.

Alarm De- scription

Time of Oc- currence

End Time

Re- marks

History Alarm Records of the BTS

Site No. Alarm Description and Troubleshooting

Remarks

Appendix A Maintenance Data Record Forms


History Notification Message Records of the BTS

Site No.

Notification Message Description and Troubleshooting

Remarks

Real–time Status Abnormality Records of Cells

Site No. Abnormalities and Troubleshooting

Remarks

Customer Complaints

Site No. Complaint Details and Troubleshooting

Remarks

Shift Description:

Shift Leader:

Verification:

Monthly Maintenance Record Form

BTS&Node B maintenance personnel should make the monthly maintenance record form every day. Table 18 shows the monthly maintenance record form.

TABLE 18 MONTHLY MAINTENANCE RECORD FORM

Maintenance Time: Maintenance Staff:

Check Item

Condition Record

Handling Method

Remarks

Equipment room's

temperature, humidity, and

cleanness

Cabinet's power supply and



grounding condition

Cabinet's

protection and dust-proof condition

Trunk cable, fiber, and

various data cable connections

Alarm

frequency analysis

Monthly cell performance report data analysis

Record of the Worst Cell

Handling the Worst Cell

Remarks

Spare parts

The spare parts are complete and in good

condition

Yes No

Shift Leader:

Verification:

Quarterly Maintenance Record Form

Table 19 shows the quarterly maintenance record form of BTS&Node B.

TABLE 19 QUARTERLY MAINTENANCE RECORD FORM


Category Check Item Check Result

Remarks Conversation, coverage, and handover tests

The coverage test result is normal

Yes No

The conversation test result is normal

Yes No

The handover test result is normal

Yes No





Remarks

Equipment room maintenance

The fire fighting facilities are complete

Yes No

The burglar nets, doors and windows are in- tact

Yes No

The air conditioners in the equipment room are running normally

Yes No

The equipment room is clean

Yes No

The equipment room's lighting system is normal

Yes No

The sockets in the equipment room are normal

Yes No

The environment alarm collection devices are normal

Yes No

Main equipment check

The fans are running normally

Yes No

The boards are running normally

Yes No

Cable connection check

The GPS cable connections are normal

Yes No

Shift Leader:

Verification:

Semiyearly Maintenance Record Form

Table 20 shows the semiyearly maintenance record form of BTS&Node B.



TABLE 20 SEMIYEARLY MAINTENANCE RECORD FORM



Remarks Equipment cleanness

The fan is clean

Yes No

Board diagnosis and test

The test result is normal

Yes No

Shift Leader:

Verification:

Yearly Maintenance Record Form

Table 21 shows the yearly maintenance record form of BTS&Node B.

TABLE 21 YEARLY MAINTENANCE RECORD FORM



Remarks Board changeover test

The CC board changeover is normal

Yes No

Grounding and lightning protection check

The lightning protector is normal

Yes No

The grounding cable is reliable

Yes No

Testing the grounding resistance

Grounding resistance:

Other Checks

The iron tower is normal

Yes No

The pole is normal

Yes No

The transmission equipments are running normally

Yes No

The batteries are normal

Yes No

Shift Leader:

Verification:



Emergency Troubleshooting Record Form

Table 22 shows the emergency troubleshooting record form.

TABLE 22 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 in daily routine maintenance Others

Fault type:

Fault symptom:

Troubleshooting:

Result:

Leader's comments:

Part Replacement Data Record Form

Table 23 shows the part replacement data record form.

TABLE 23 PART REPLACEMENT DATA RECORD FORM

Module/Cable Replacement Data Record Form

BTS No.: Maintenance Staff:

Board/Ca- ble Type

Module

Slot/Cable Connection

Position

Time of

Fault Occurrence

Time of Re- placement

Faulty Mod- ule/Cable Serial No.

Replacing Module/

Cable Serial No.



Module/Cable Replacement Data Record Form

BTS No.: Maintenance Staff:

Board/Ca- ble Type

Module

Slot/Cable Connection

Position

Time of

Fault Occurrence

Time of Re- placement

Faulty Mod- ule/Cable Serial No.

Replacing Module/

Cable Serial No.

Figures


Figure 1 Fault Management Interface ................................13

Figure 2 Displaying Current Alarms ......................................13

Figure 3 Viewing Site's Current Alarms .................................14

Figure 4 Clicking Quick Search Button ................................15

Figure 5 Setting Query Condition - Location ..........................15

Figure 6 Setting Query Condition - Restore Time....................16

Figure 7 Setting Query Index ..............................................18

Figure 8 Setting Query Time ...............................................18

Figure 9 Setting Query Object .............................................19

Figure 10 Double-Clicking Statistics Frequency By Alarm

Code ...............................................................22

Figure 11 Setting Query Condition - Location.........................23

Figure 12 Setting Query Condition - Restore Time ..................24

Figure 13 Setting Query Index ............................................25

Figure 14 Setting Query Time..............................................25

Figure 15 Setting Query Object ...........................................26

Figure 16 Pulling Out PM Board ...........................................57

Figure 17 Pulling Out FS Board ............................................58

Figures


Tables


Table 1 Safety Symbols and Meanings ................................... 2

Table 2 Daily Routine Maintenance Items ..............................11

Table 3 Monthly Routine Maintenance Items ..........................21

Table 4 Quarterly Routine Maintenance Items ........................33

Table 5 Normal Status of Indicators on CC Panel ....................37

Table 6 Normal Status of Indicators on UBPG (or BPC) Panel ...39

Table 7 Normal Status of Indicators on FS Panel ....................40

Table 8 Normal Status of Indicators on SA Panel ....................40

Table 9 Abnormal Status of Indicators on CC Panel.................41

Table 10 Abnormal Status of Indicators on UBPG (or BPC)

Panel ...............................................................42

Table 11 Abnormal Status of Indicators on FS Panel ...............42

Table 12 Abnormal Status of Indicators on SA Panel ...............42

Table 13 Semiyearly Routine Maintenance Items ....................45

Table 14 Yearly Routine Maintenance Items ...........................47

Table 15 Influence of Board Replacement on System ..............55

Table 16 Influence of Cable Replacement on System...............61

Table 17 Daily Maintenance Record Form ............................... 81

Table 18 Monthly Maintenance Record Form ............................82

Table 19 Quarterly Maintenance Record Form ......................... 83

Table 20 Semiyearly Maintenance Record Form ....................... 85

Table 21 Yearly Maintenance Record Form .............................. 85

Table 22 Emergency Troubleshooting Record Form .................. 86

Table 23 Part Replacement Data Record Form ......................... 86

Tables



Glossary


VSWR - Voltage Standing Wave Ratio

ZXSDR BTS&Node B Maintenance Guide v1.0

Documents

Transcript of ZXSDR BTS&Node B Maintenance Guide v1.0