wr_ts02_e1_0 zxwr node b maintenance 86
DESCRIPTION
WR_TS02_E1_0 ZXWR Node B Maintenance 86TRANSCRIPT
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WR_TS02_E1_0 ZXWR Node B Maintenance
ZTE CORPORATION ZTE Plaza, Keji Road South, Hi-Tech Industrial Park, Nanshan District, Shenzhen, P. R. China 518057 Tel: (86) 755 26771900 800-9830-9830 Fax: (86) 755 26772236 URL: http://support.zte.com.cn E-mail: [email protected]
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Contents
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Appendix A 79
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C h a p t e r 1
Maintenance Overview
This chapter introduces common maintenance types, maintenance principles and analysis methods and provides precautions for routine maintenance.
Maintenance Description
Maintenance Requirements
Maintenance personnel must receive systematic training to be qualified in system maintenance, master fundamentals of ZXWR B09, and know overall structure and functions of each board, in addition to some knowledge about network optimization and network maintenance.
Maintenance Principles This section introduces what maintenance personnel must pay attention to in ZXWR B09 maintenance. Any operation against following principles may have a negative impact on system operation.
Right Management
Assign personnel-specific usernames and passwords for system login, operation and maintenance, to restrict operation rights of maintenance individuals and find operation history through system logs in case of system malfunction.
Different users are able to perform different groups of operations, depending on their levels and rights. Operation and
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maintenance software classifies operators into four levels, root user, advanced user, medium-level user, and ordinary user in descending order of rights.
1. Root user, with highest level of right, can perform any operations, including creating users, modifying user information, deleting users, setting rights and modifying system configuration. Change initial password of root user immediately after logging in to the system, for security of the system
2. Advanced user has the same rights as a root user, except that it cannot manage user accounts, add/delete boards and add/delete local cells.
3. Medium-level user, with basic viewing right, can view alarm and system information. In addition, a medium-level user can only perform limited types of configuration operations.
4. Ordinary user, with lowest right, can only view information rather than perform any configuration operation.
Caution
Use right management function to set ordinary equipment maintenance personnel as medium-level users.
Do not log into the system as root user unless absolutely necessary.
Do not change network settings of NMS server and Client.
Do not run and operate any other programs not related to operation and maintenance on NMS server or Client.
Follow general principles of network management to guard against any virus.
Data Observation
Caution
Perform data observation operations carefully with large quantities of data to report, including signaling tracing, running information observation, all users of service observation, and alarm refreshing. Excessive data report during data observation may cause system breakdown in extreme cases.
Caution
Select appropriate time (low traffic period) for data observation operation, take appropriate measures, save results in time and clean temporary data in time.
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Data Modification
Caution
Take care in modifying data, particularly wireless data.
Observe carefully whether there is any effect on system operation after modifying data.
Caution
Be sure to perform backup before modifying any data, to ensure rapid restoration when any problem occurs.
Do not perform data synchronization at rush hours (at 10 AM or 5 PM, Time varies from place to place).
Do not modify foreground database during daytime.
Data Synchronization
Caution
Be sure to backup data before modifying configuration.
Caution
Do not perform data synchronization in daytime unless necessary.
Check operation log to identify the source if finding any data of an unknown source.
Man-machine Commands
Caution
Be careful in using commands that lead to foreground actions, including restart, reset, changeover, save, hardware test, software download and cell block/unblock.
Do not delete current alarms and history alarms unless absolutely necessary.
Be sure to lock background man-machine interface after maintenance personnel leave operation and maintenance console, to avoid any accidents.
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Board Operations
Caution
Do not reset a board, plug/unplug it or power it off unless absolutely necessary.
Prepare spare board before replacing a board. Make sure there are sufficient technicians present for unexpected emergencies in the case of major operations, such as changing versions of important boards, or plugging, unplugging and replacing key boards. Maintenance personnel working on boards in the foreground must have support from background personnel.
Caution:
Always wear an antistatic wrist strap before operating boards on the rack and connect it to the rack before touching a board.
Touch a metal object first to release static electricity on hands.
Reduce power gradually (to change users in conversation or in network access and to prevent users off-conversation from accessing) when replacing LPA (Linear Power Amplifier).
Update
Caution
Perform upgrade at midnight when there is low traffic.
Keep contact information available for relevant personnel (like transmission and power supply) to get their timely assistance when required.
Formulate upgrade plan in advance, covering all emergency measures.
Do not change procedures set forth in the plan, unless necessary.
Inform supervisors before upgrading for necessary technical support.
Assign a person to closely monitor the system for any faults occurring since the upgrade.
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Maintenance Classification Maintenance falls into routine maintenance, notification message handling, alarm message handling and troubleshooting, by contents.
1. Routine maintenance
Routine maintenance refers to checking equipment running status periodically. It is to find out and handle problems in time to prevent potential damage or fault.
2. Notification message handling
Notification message handling is to analyze all kinds of notifications during running of the system, to judge whether anything is abnormal and to take appropriate measures.
3. Alarm message handling
Alarm message handling is to analyze different alarm messages during running of the equipment, to judge equipment running condition and to take appropriate measures.
4. Troubleshooting
Troubleshooting is to analyze, handle and remove detected faults.
Analysis Methods Common maintenance analysis methods:
Analysis of indicator status
Analysis of signalling tracing
Analysis of alarm logs
Analysis through instruments and meters
Comparison by replacement
Others
Indicator Status Analysis
Analyze running of a board by statuses of its indicators.
Boards need frequent observation, for the ZXWR B09, are: control clock switching board CCS, Iub-ATM interface board IIA, baseband processing board BP and transceiver unit TRXU.
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Signaling Tracing Analysis
Signaling tracing analysis is to check whether signaling flow is correct. All services have their own signaling flows. It is acceptable to diagnose system problems according to experience by viewing differences between current flow and correct flow, when a service is abnormal.
Important workflow, for the ZXWR B09, includes: cell setup, common transmission channel setup, paging, random access, system information update and wireless link setup.
Alarm Logs Analysis
Alarm log analysis is to query history alarms and current alarms of the system at NM interface, and to analyze and determine running status of the equipment. Instruments and Meters Analysis
Commonly-used instruments and meters in routine maintenance include signaling meters, line testers and power meters.
Signaling Meter Analysis
Signaling meter is to monitor signaling interaction between Node B and RNC in real time. Figure 1 shows the connection mode of signaling meter with the equipment.
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FI G U R E 1 AP P L I C AT I O N O F S I G N AL L I N G M E T E R AT RNS
RNC
RNC
Node B
Node B
Laptop computer
1
2
90%
100%
10%
100%90
%Optical splitter
Signaling meter
10%
RNC and Node B setup several AAL5 links to bear ALCAP, common NBAP, dedicated NBAP and IPoA after powering on the equipment. It is acceptable to query VPI and VCI corresponding to each AAL5 link from OMC background man-machine interface. It is also acceptable to monitor signaling of corresponding AAL5 link after configuring appropriate VPI and VCI on signaling meter.
Set up appropriate VPI, VCI and CID on signaling meter, when AAL2 bears common transport channels (FACH, PCH, and RACH) and DCH and observes AAL2 signaling. Similarly, it is acceptable to query its signaling from WOMCR background man-machine interface. Signaling meter can resolve RRC message of Uu interface and non-access layer messages.
Signaling meter analysis allows monitoring signaling flows between Node B, RNC and UE in real time and saving results.
Line Tester Measurement
Line tester supports:
1. To measure information of common channels.
2. To measure related items in coverage area, such as locations, signal strength and signal quality.
3. To measure energy of each synchronization code in each timeslot on synchronization channel.
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4. To measure channel power.
5. To measure scramble of the cell.
Power Meter Measurement
Power meter is to measure output power of TRXU and LPA and to judge whether TRXU and LPA are working normally.
Replacement Analysis
Replace a board module or possibly a faulty connection cable with a normal board module or connection cable of same type, and observe whether the fault is recovered after the replacement.
Use the following replacement analysis methods to rectify faulty boards or a subsystem.
Active/Standby Switchover
This method applies to active and standby boards configured on the ZXWR B09 rack, such as CCS.
Operate on background man-machine interface or press active/standby switchover key on front panel of the board to reset the board and to trigger active/standby switchover function.
Perform a switchover again when traffic is light and observe whether system is normal if the system recovers after active/standby switchover. Circuit or interface of currently active board may fail if system is not normal. Replace it and perform further tests.
Board Resource Block
This method applies to BP.
Block, possibly a faulty BP and check the working status of the system. Fault resides in BP or interface of the board if system recovers. Replace the board, unblock it and perform further tests.
Slot Exchange
This method applies to BP and TRXU. There is need to configure multiple BPs and TRUXs on the ZXWR B09 rack.
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Exchange slot of a normal board with a possibly faulty board, and check working states of boards to determine whether fault resides in the board or interface of the board.
Board Replacement
This method applies to EMU and TRXU configured for single carrier and single fan. Directly replace a possibly faulty board with a new board verified as normal.
Cable Replacement
Cables that easily fail include TRXU RF cable, IIA port fiber/E1 line and rack fan connection line. Specific method:
1. Connect RF cable of the TRXU, parts of which are possibly faulty, to DDL of another normal cell, and check status of the cell. TRXU and related parts are normal if the cell is still normal. Otherwise, replace them.
2. Remove connected optical fiber and check it through self-loop if an optical interface of IIA is blocked. This optical interface is faulty if self-check is abnormal. Connect the fiber to another available optical interface of IIA and reconfigure the data. Replace the optical fiber or check peer equipment if the other optical interface is found normal in self-loop test.
Caution
Do not direct optical fiber interface to eyes, this may result in a serious injury.
Do not look at IIA board optical interface directly, this may result in a serious injury.
It is very difficult to remove fans on the rack. Check power cable first by connecting it to another slot or using other methods when finding that a fan is not working normally.
Precautions
Personnel Qualifications
Maintenance personnel must receive pre-service training to learn necessary knowledge about the equipment and related network, and they must follow instructions given in related manuals of the ZXWR B09 to conduct maintenance.
Maintenance personnel must have earnest attitudes and high competence.
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Maintenance Management
Make a complete set of equipment room maintenance regulations to standardize daily work of the maintenance personnel. Forbid non-maintenance management personnel to perform any maintenance operation.
Make a detailed on-duty log to provide detailed records about system running, version status, data change, upgrade and problem handling for easy analysis and troubleshooting once any fault occurs.
Make a work shift record to clearly define responsibilities.
Do not play games or access the Internet through computer terminal. Do not install, run and copy any other software not related to the system at the terminal. Do not use the computer terminal for other purposes.
Set NM passwords by level. Put them under strict management and change them periodically so that they are only accessible to maintenance personnel.
Data Maintenance
Do not reset the equipment, load or change any data unless absolutely necessary. Do not change background database at will.
Backup the data before making any changes. Do not delete backup data after changing data until observation period (usually one week) expires and be sure that the equipment is running normally.
Equipment Room Environment
Maintain normal temperature/humidity in the equipment room. Keep the environment tidy and clean, free from dust and moisture. Keep rodents or insects out of the equipment room.
Ensure that primary power of the system is stable and reliable, and check system grounding and lightning protection ground periodically. Check lightning protection system to make sure all facilities are in good condition, especially before storm seasons and after thunderstorms.
The equipment room must have sufficient luminance compliant with relevant standards. Repair lamps damaged in time and make sure that light reaches all around the equipment room.
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Tools and Instruments/Meters
All common-use tools, instruments and meters must be available.
Instruments and meters must be subject to periodic checking and calibration to ensure function availability and accuracy.
Spare Materials and Parts
Check spare materials and parts regularly to ensure sufficient stocks and to prevent them from mold.
Store spare materials and parts and faulty ones separately. Mark them properly for easy identification.
Technical Documents
Store maintenance-related application software and technical documents by category at a specified location for easy access when necessary.
Technical Support
Handle faults immediately when they occur. Contact local office of ZTE Corporation for any faults you cannot solve.
Display contact information of local office of ZTE at a conspicuous location in the equipment room. Make it known to all maintenance management personnel, and update it regularly.
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C h a p t e r 2
Routine Maintenance
This chapter introduces basic contents for routine maintenance of the ZXWR B09 and lists daily, weekly, monthly and semiannual routine maintenance items.
Overview Routine maintenance refers to periodic preventive maintenance and check on the equipment so that the equipment can run in a stable state for long. Routine maintenance includes:
1. Periodic maintenance check: Make routine check and test the BTS equipment running, required functions, important performance indices and hardware in compliance with prescribed operation steps and methods through various designated background operations or with necessary instruments and meters on regular and scheduled basis.
2. Periodic check: Check hardware parts of BTS equipment and its attached equipment one by one. Adjust, correct or replace any defective part promptly to ensure equipment hardware is in good condition. Regularly maintain and clean components with high dust-proof requirements. Clean important components of other peripherals regularly for normal running.
Caution
Not all routine maintenance items described apply to all kinds of possible cases. It is acceptable to refer to them and work out routine maintenance items according to actual situation.
RNC (Radio Network Controller), in WCDMA system, controls all radio parameters, so following maintenance items do not include network quality analysis and statistics.
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Daily Routine Maintenance Items Table 1 shows daily routine maintenance items of the ZXWR B09.
T AB L E 1 D AI L Y R O U T I N E M AI N T E N AN C E I T E M S
Item Sub-item Contents Remar
ks
Alarms and notifications check
Alarm message handling
Check all alarms at the NM terminal, and handle them according to alarm level
Notification message handling
Analyze notification messages that frequently occur and it is acceptable to ignore common ones
Troubleshooting
Troubleshooting
Handle common faults such as transmission fault and board fault
Handle faults reflected by the users
Analyze and handle network quality problem reflected by the user
Weekly Routine Maintenance Items Table 2 shows weekly routine maintenance items of ZXWR B09.
T AB L E 2 W E E K L Y RO U TI N E M AI N TE N AN C E I T E M S
Item Sub-item Contents Remarks
NM
Data backup Backup configuration data for OMCB NMS
Perform system backup at low-traffic
Check and update operating system, anti-virus software and firewall software
Install a patch for operation system of OMCB system
Update virus library and check firewall record
Update operating system immediately when there is a key update for it
Disk capacity check
Check whether disk space satisfies system running requirements
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Monthly Routine Maintenance Items Table 3 shows monthly routine maintenance items of ZXWR B09.
T AB L E 3 M O N T H L Y RO U TI N E M AI N T E N AN C E I TE M S
Item Sub-item Contents Remarks
Radio parameters
Engineering parameters
Check BTS location parameters
Check antenna parameters
Update parameters according to project situation. Save parameters for at least two years
NM
Hardware check
Check whether host and peripherals are in good condition
Check whether network communication is normal
Software check
Check whether operating system is running normally
Checking whether NMS process is normal
Check whether database system is running normally
Data backup
Complete backup log files
Complete backup data files
Backup the files every time before system upgrade, patching or network structure adjustment
BTS equipment
Check BTS equipment and its accessories
Clean the equipment rack
Clean the air filter
Check the cable tree
Check DDF, E1/fiber and all connectors
Check BTS equipment
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Item Sub-item Contents Remarks
indicators
Equipment room environment
Temperature and humidity
Check temperature in the equipment room
Check humidity in the equipment room
Spare materials and parts
Spare parts check
Check spare parts for boards
Check spare parts for racks
Check other spare parts
Semiannual Routine Maintenance Items Table 4 shows semiannual routine maintenance items of the ZXWR B09.
T AB L E 4 SE M I AN N U AL RO U T I N E M AI N T E N AN C E I T E M S
Item Sub-item Contents Remarks
Lightning grounding
Lightning grounding
Check working ground of the equipment
Check protection ground of the equipment room
Check grounding trunk line of BTS
Check lightning grounding of the building
Test each type of grounding resistance
Check all items before and after a natural disaster
Antenna feeder system
Iron tower
Check tower light
Check structure and foundation for any distortion or sinking
Check uprightness and height of the tower
Check all types of bolts
Check anticorrosion and rustproof measures
Check all items comprehensively when meeting gale force above 8, earthquake or other natural disaster
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Item Sub-item Contents Remarks
Pole
Check installation of fixing parts
Check stress on the pole, pull wire of pull wire tower and ground anchor
Check anticorrosion and rustproof measures
Check uprightness of the pole
Antenna
Check antenna installation parameters
Check fixing status of the antenna
Check pitch angle of the antenna
Feeder
Check installation of feeder and jumper
Check feeder connectors
Check waterproof and airproof measures for antenna feeder system
Check grounding status for feeder
Check water-dropping bend
Other Recommended Maintenance Items Daily Routine Maintenance Items and Semiannual Routine Maintenance Items list maintenance items closely related to the ZXWR B09. There are still other maintenance items that affect the running of the network in daily operations. Refer to Table 5 for examples and recommended maintenance periods.
T AB L E 5 EX AM P L E S O F O T H E R M AI N T E N AN C E I T E M S
Item Sub-item Contents Recommended
Period
BTS equipment
Standing wave ratio test
Test standing wave ratio of each cell
Semiannual
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Item Sub-item Contents Recommended
Period
Equipment room environment
Cleanness
Clean the floor, doors, windows, cabinets and other parts
Monthly
Lighting
Check routine lighting and emergency lighting facilities
Sockets
Check whether AC sockets are complete and in good condition
Safety
Check to find out hidden safety troubles
Check fire-control facilities
Check protection measures for the equipment
Devices in the equipment room
Air conditioner
Clean outdoor machine
Clean the air filter
Check all alarm messages
Check installation of air conditioners
Check drainages of air conditioners
Measure input voltage and current
Semiannual
Environment monitoring system
Check running status of each type of sensor
Check the power display.
Check the battery display.
Clean chassis of monitoring system
Monthly
Low-voltage power distribution and switch power supply
Check whether switch and connector are in good condition
Check whether signal indicator and alarm are normal
Clean power distribution device
Check AC feeder
Monthly
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Item Sub-item Contents Recommended
Period
and connection parts
Measure temperature rise of the fuser
Battery
Clean batteries
Measure voltage of a single battery
Measure end voltage of each battery and ambient temperature
Check whether there is any liquid leakage
Check whether contact of leading wire and terminal are well and whether there is erosion
Check whether connection pieces between batteries are tight
Quarterly
Capacity discharging test
Yearly
Diesel generator
Charge startup battery, and add distilled water when necessary
Semimonthly
Clean the equipment
Check startup, cooling, lubricating and fuel systems
Run the machine for 20 minutes, without any load
Monthly
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C h a p t e r 3
Notification and Handling
This chapter introduces types of notification messages that may occur during running of the ZXWR B09, and gives possible causes of them.
Notification Messages When any unrepeatable or transient abnormality occurs during the running of ZXWR B09, the system reports in the form of notification. Maintenance management personnel learn running status of each part of Node B from notification message.
Board Notification
SSCOP Error
Item Contents
Description SSCOP error
Alarm level Alarm notification
Alarm type Communication alarm
Cause SSCOP receives error PDU
ALCAP Link Error
Item Contents
Description ALCAP link error
Alarm level Alarm notification
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Item Contents
Alarm type Error handling alarm
Cause ALCAP receives invalid message or the status is error
AAL5_MAC Error
Item Contents
Description AAL5_MAC error
Alarm level Alarm notification
Alarm type Communication alarm
Cause Packet loss or error packet occurs on this link, or the switching network is error
RS232 Serial Port Error
Item Contents
Description RS232 serial port error
Alarm level Notification
Alarm type Communication alarm
Cause
1. GPS RS232 serial port receiving frame CRC error;
2. GPS RS232 serial port sending data error;
3. Micro-Control Unit (MCU) RS232 serial port receiving frame CRC error;
4. Micro-Control Unit (MCU) RS232 serial port sending data error.
STM-1 B1 Error Code
Item Contents
Description STM-1 B1 error code alarm
Alarm level Alarm notification
Alarm type Communication alarm
Cause
Quality of transmission line is deteriorated (optical power is too big or too small); there is strong electromagnetic interference near the optical interface; optical connector is not clean; ambient temperature where the equipment works is too high.
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STM-1 B2 Error Code
Item Contents
Description STM-1 B2 error code alarm
Alarm level Alarm notification
Alarm type Communication alarm
Cause
Quality of transmission line is deteriorated (optical power is too big or too small); there is strong electromagnetic interference near the optical interface; optical connector is not clean; ambient temperature where the equipment works is too high.
STM-1 Remote B2 Error Code Indication
Item Contents
Description STM-1 remote B2 error code indication alarm
Alarm level Alarm notification
Alarm type Communication alarm
Cause This alarm is the reply alarm when peer end detects received B2 error codes.
Examples of Other Maintenance Items STM-1 B3 Error Code
Item Contents
Description STM-1 B3 error code alarm
Alarm level Alarm notification
Alarm type Communication alarm
Cause
Quality of transmission line is deteriorated (optical power is too big or too small); there is strong electromagnetic interference near the optical interface; optical connector is not clean; ambient temperature where the equipment works is too high.
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STM-1 B3 Remote Error Code Indication
Item Contents
Description STM-1 B3 remote error code indication alarm
Alarm level Alarm notification
Alarm type Communication alarm
Cause This alarm is the reply alarm when peer end detects received B2 bit error.
STM-1 Multiplex Section Remote Defect Indication (MSRDI)
Item Contents
Description STM-1 Multiplex Section Remote Defect Indication (MSRDI)
Alarm level Alarm notification
Alarm type Communication alarm
Cause Peer end returns MSRDI alarm to this end when receiving LOS, LOF or MSAIS alarm.
STM-1 Higher-order Path Defect Indication (HPRDI)
Item Contents
Description STM-1 Higher-order Path Defect Indication (HPRDI)
Alarm level Alarm notification
Alarm type Communication alarm
Cause Remote end returns HPRDI alarm to this end when receiving HP-AIS, AU-LOP or path tracing byte mismatching message.
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STM-1 Higher-order Path Lady Type Mismatching (HPPLM)
Item Contents
Description STM-1 Higher-order Path Lady Type Mismatching (HPPLM)
Alarm level Alarm notification
Alarm type Communication alarm
Cause Load type (C2 byte) borne by higher-order path in STM-1 frame structure received by this end is not ATM. This alarm occurs along with other alarms.
Loss of STM-1 Cell Delimitation (LCD)
Item Contents
Description Loss of Cell Delimitation (LCD) of STM-1
Alarm level Alarm notification
Alarm type Communication alarm
Cause The clock is not synchronized or there is a bit error. Other STM-1 alarms occur at the same time usually.
STM-1 Received Cell with CRC Error
Item Contents
Description STM-1 received cell with CRC error
Alarm level Alarm notification
Alarm type Communication alarm
Cause The clock is not synchronized or there are error codes. Other STM-1 alarms occur at the same time generally.
E1 Link HDB3 Coding Violation
Item Contents
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Item Contents
Description E1 link HDB3 coding violates the rule
Alarm level Alarm notification
Alarm type Communication alarm
Cause IIA board interface performance; E1 cable quality is poor; equipment shares the ground.
E1 Link Slip
Item Contents
Description E1 link slip alarm
Alarm level Alarm notification
Alarm type Communication alarm
Cause The E1 clock is out of synchronization.
Too-Heavy ATM Traffic
Item Contents
Description ATM traffic is too heavy.
Alarm level Alarm notification
Alarm type Communication alarm
Cause Actual traffic of ATM exceeds the preset bandwidth.
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C h a p t e r 4
Alarm and Handling
This chapter introduces types of alarm messages that may occur during running of the ZXWR B09, and gives severities (levels), possible causes and troubleshooting methods.
Alarm Messages Any problem or fault that occurs during running of the ZXWR B09 is reported in form of an alarm message.
Usually, alarm messages last some time and do not disappear until corresponding problems or faults disappear.
Alarm messages fall into four levels, level 1: Critical, level 2: Major, level 3: Minor and level 4: Alarming.
1. Critical alarm
It is an alarm for board failure.
For example: related resources of a board are blocked, functions of the system are fatally affected, and maintenance and management personnel need to replace the board or perform other troubleshooting procedures to clear the fault.
2. Major alarm
It is an alarm for a serious fault, and it will last for some time.
Functions of the system are seriously affected, with signs of services being affected. For example, QoS of a type of equipment severely degrades, and maintenance and management personnel need to perform emergency repair to eliminate the fault.
3. Minor alarm
It is an alarm for a minor fault.
Functions of the system are slightly affected, indicating existence of factors that do not affect normal services. It is necessary to take measures to prevent severe faults and to
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let maintenance and management personnel eliminate the fault.
4. Alarming alarm
It is an alarm that indicates existence of potential problems or problems that are about to affect normal services. It is necessary to take measures to prevent them from developing into faults that may severely affect normal services.
Following sections details possible alarms in the system for users reference. Contact Customer Support Center of ZTE in time if failing to handle a generated alarm.
CCS Alarms Note
When handling with alarms, perform in the order of Handling until alarm vanish. For example, if there are 5 steps in Handling and alarms vanish when you go on with Step 3, Seps 4 and 5 are unnecessary.
SSCOP Signaling Link Disconnected
Item Contents
Description SSCOP signaling link is disconnected.
Alarm level Major alarm
Alarm type Communication alarm
Cause
1. Transmission layer parameters are not configured consistent for Node B, RNC and cascaded Node B;
2. Node B transmission layer error;
3. Communication cable error;
4. Peer RNC or cascaded Node B fails.
Handling
1. Check whether transmission layer parameters are configured consistent for Node B, RNC and cascaded Node B. Modify configurations if not consistent;
2. Reset IIA or CCS;
3. Check whether communication cable gets faulty;
4. Check whether peer RNC or cascaded Node B fails.
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Clock Reference Source Lost
Item Contents
Description Clock reference source lost
Alarm level Alarming alarm
Alarm type Equipment alarm
Cause
1. IIA1 clock reference source lost;
2. IIA2 clock reference source lost;
3. GPS clock lost;
4. BITS clock lost,
Handling
If it is the line clock reference source lost, check whether the system configures the line clock reference source by mistake;
If it is GPS 1pps reference source lost:
1. Check whether there are alarms with GPS. Handle with them if there are any;
2. Check whether connection between EMC and CCS is normal;
3. Replace GPS.
If it is 8 kHz clock reference source lost:
1. Check whether connection between EMU and CCS is normal;
2. Check the external clock.
Clock Module Error
Item Contents
Description Clock module error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause
1. 61.44 M clock alarm;
2. 10 M clock alarm;
3. FR alarm;
4. FN alarm.
Handling
1. Check whether system clock signal are abnormal;
2. Check whether there are clock signals input on boards;
3. Check whether connection between boards and backplane is abnormal;
4. Check whether board clock receiving module is abnormal.
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Board Communication Link Disconnected
Item Contents
Description Board communication link is disconnected.
Alarm level Critical alarm
Alarm type Communication alarm
Cause 1. Communication cables error;
2. Board error.
Handling
1. Configuration board must be inserted in the slot. If it is the middle transfer board error, unplug the middle link disconnected board first;
2. Unplug the link disconnected board;
3. Replace the link disconnected board or middle transfer board.
Active/Standby Synchronization Failure
Item Contents
Description Active/Standby synchronization failure
Alarm level Minor alarm
Alarm type Error handling alarm
Cause
1. Database active/standby synchronization failure;
2. Operation software version synchronization failure;
3. Backup software version synchronization failure.
Handling
1. Confirm whether there are active/standby link disconnected alarm;
2. Confirm there are version error alarms on MS board and hardware error on backup board;
3. Not intervene, waiting for the system to restore automatically;
4. Reset the board if the system fails to restore automatically;
5. Replace CCS backplane.
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Software Version Error
Item Contents
Description Software version error
Alarm level Major alarm
Alarm type Error handling alarm
Cause There are correlated records of this software on the foreground or the file of this type software saved on the foreground is damaged.
Handling Re-download faulty software version.
Software Operation Failure
Item Contents
Description Software operation failure
Alarm level Critical alarm
Alarm type Error handling alarm
Cause Software version error or board error
Handling
1. Check whether software version alarm exits;
2. Reset the board;
3. Replace the board.
Board Parameter Synchronization Abnormal
Item Contents
Description Board parameter synchronization abnormal
Alarm level Critical alarm
Alarm type Communication alarm
Cause
1. Board is configured but not plugged;
2. Board link is disconnected;
3. Board software is abnormal.
Handling
1. Check whether there are board link alarms. If so, handle with the alarm and repeat the configuration process or restart the board;
2. Check whether there are board application software monitoring alarms. If so, handle with the alarm and reset the board;
3. Re-configure parameters on the background;
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4. Re-start the board.
Application Software Monitoring Alarm
Item Contents
Description Application software monitoring alarm
Alarm level Critical alarm
Alarm type Communication alarm
Cause 1. Communication line error;
2. Board error.
Handling
1. Check whether there are board link alarms;
2. Reset;
3. Replace the board with alarms.
Database Save Failure
Item Contents
Description Database save failure
Alarm level Minor alarm
Alarm type Error handling alarm
Cause 1. Harddisk error;
2. Harddisk is full.
Handling Replace the board.
Reference Resource PRI Configuration Failure
Item Contents
Description Reference resource PRI configuration failure
Alarm level Minor alarm
Alarm type Equipment alarm
Cause The system configures the reference source that is not supported.
Handling Check whether the system has configured the reference source that is not supported. If so,
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Item Contents
delete it and reset the board and the switching.
SSCOP Delivery Buffer Overflow
Item Contents
Description SSCOP delivery buffer overflow
Alarm level Major alarm
Alarm type Communication alarm
Cause The message is abnormal.
Handling Reset the CCS.
Board Configuration Error Alarm
Item Contents
Description Board configuration error alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause
1. The board on the left RBI slot is configured error;
2. The board on the right RBI slot is configured error;
3. The board on the BP slot is configured error.
Handling Modify the background configurations.
SNTP Time Alignment Failure Alarm
Item Contents
Description SNTP time alignment failure alarm
Alarm level Alarming alarm
Alarm type Communication alarm
Cause 1. IP address of SNTP server is configured faulty;
2. Link with SNTP server error.
Handling
1. Check whether the link with SNTP server is error;
2. Check whether the IP address of SNTP server is configured faulty.
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Clock Reference Source Deterioration
Item Contents
Description Clock reference source deterioration
Alarm level Major alarm
Alarm type Equipment alarm
Cause The reference clock quality is too bad.
Handling
1. If current reference source is a line clock, inform RNC-related personnel of normal clock input;
2. Replace the reference source.
CPU Overload Alarm
Item Contents
Description Board configuration error alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause High-layer software operation abnormal or board error, which results in frequent alarm reports.
Handling Check whether there are alarms on the board and isolate the faulty board.
Board Hardware Error
Item Contents
Description Board hardware error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Equipment hardware is abnormal.
Handling Replace the error board.
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RBI Alarms
Clock Module Alarm
Item Contents
Description RBI clock module alarm
Alarm level Critical alarm
Alarm type Equipment alarm
Cause
1. System clock signal is abnormal;
2. Connection between board and backplane is abnormal;
3. Board clock receiving module gets abnormal.
Handling
1. Check whether CCS has a clock alarm. Solve it first if such a clock alarm exists;
2. Reset the RBI;
3. Unplug and plug the RBI;
4. Replace the RBI.
Downlink LVDS Link Error
Item Contents
Description Downlink LVDS link error
Alarm level Critical alarm
Alarm type Communication alarm
Cause
1. LVDS transmitting module of upstream board is abnormal;
2. LVDS link of corresponding backplane is abnormal;
3. Interface between board and backplane is abnormal;
4. LVDS receiving module gets abnormal.
Handling
1. Make sure corresponding board and backplane are in good contact;
2. Reset the RBI;
3. Reset upstream boards (BP and TRXU);
4. Replace the RBI;
5. Replace upstream boards.
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Uplink LVDS Link Error
Item Contents
Description Uplink LVDS link error
Alarm level Critical alarm
Alarm type Communication alarm
Cause
1. LVDS transmitting module of corresponding TRXU is abnormal;
2. LVDS link of corresponding backplane is abnormal;
3. Interface between board and backplane is abnormal;
4. LVDS receiving module gets abnormal.
Handling
1. Make sure corresponding board and backplane are in good contact;
2. Reset the RBI;
3. Reset corresponding TRXU;
4. Replace the RBI;
5. Replace corresponding TRXU.
Software Operation Failure
Item Contents
Description Software operation failure
Alarm level Critical alarm
Alarm type Error handling alarm
Cause Software version error or board error
Handling
1. Check whether there are software version alarm;
2. Reset the board;
3. Replace the board.
Board Configuration Parameter Error
Item Contents
Description Board configuration parameter error
Alarm level Major alarm
Alarm type Equipment alarm
Cause Configuration parameter error or hardware error
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Item Contents
Handling 1. Reset the board;
2. Replace the board.
CPU Overload Alarm
Item Contents
Description CPU overload alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause High-layer software operation abnormal or board error, which results in frequent alarm reports.
Handling Observe whether there are alarms on the board and isolate the faulty board.
Remote Clock Reference Alarm
Item Contents
Description Remote clock reference alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause
1. System clock signals are abnormal;
2. Connection between the board and the backplane is abnormal;
3. Board clock receiving module is abnormal.
Handling
1. Check whether there are clock type alarms on the CCS. If so, handle with it first;
2. Reset the RBI;
3. Unplug the RBI;
4. Replace RBI.
Board Hardware Error
Item Contents
Description Board hardware error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Equipment hardware is abnormal.
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Handling Replace the error board.
Optical Module Not-in-position
Item Contents
Description Optical module is not in position.
Alarm level Major alarm
Alarm type Equipment alarm
Cause Corresponding optical module is not in position or abnormal.
Handling Check whether the corresponding optical module is in position. If so, replace the corresponding optical module.
Optical Module Receiving Failure
Item Contents
Description Optical module receiving failure
Alarm level Minor alarm
Alarm type Equipment alarm
Cause
1. The corresponding RF remote is abnormal;
2. Fibers on corresponding optical interface are abnormal;
3. Connection of optical interface that the board corresponds to is abnormal;
4. Optical module that the board corresponds to is abnormal.
Handling
1. Confirm that the connection of the corresponding optical interface is well;
2. Self-loop corresponding optical interface. If the alarm still exists, go on with Step 3. If the alarm disappears, it proves that it is the fiber or corresponding RF remote error. Check the fibers. If the fibers are normal, go on with Step 6;
3. Reset the RBI;
4. Replace RBI alarm optical module;
5. Replace the RBI;
6. If conditions permit, check whether corresponding RF remote is normal.
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IIA Alarms
Loss Of Signal (LOS) of STM-1
Item Contents
Description Loss Of Signal (LOS) of STM-1
Alarm level Major alarm
Alarm type Communication alarm
Cause
The fiber is not corrected or connected with inverse receiving and transmitting; the fiber is disconnected; local optical module is damaged; peer end does not send optical interface.
Handling
1. Connect the fiber with Node B if not already connected. Exchange receiving and transmitting fibers if the alarm still exists;
2. Make self-loop for Node-B optical interface with a fiber. Replace optical module of IIA or replace IIA if the alarm still exists. Node B is OK if the alarm disappears. Go on with Step 3;
3. Check status of RNC or optical transmission equipment connecting Node B. Loop back with fiber level by level to locate the fault.
Loss Of Frame (LOF) of STM-1
Item Contents
Description Loss Of Frame (LOF) of STM-1
Alarm level Major alarm
Alarm type Communication alarm
Cause The clock is not synchronized.
Handling
1. Check CCS alarm status. Eliminate clock alarm first if it exists;
2. Check whether clock status of RNC or transmission equipment is normal.
Multiplex Section Alarm Indication of STM-1 (MSAIS)
Item Contents
Description Multiplex Section Alarm Indication of STM-1 (MSAIS)
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Alarm level Major alarm
Alarm type Communication alarm
Cause
MS-AIS alarm is sent to downstream equipment when LOS and LOF alarms occur to upstream equipment of Node B. It is also possible that NMS inserts an MSAIS alarm in transmission equipment.
Handling Check alarm status of upstream equipment of Node B and eliminate the alarm.
Loss Of Pointer (LOP) of STM-1 AU4
Item Contents
Description Loss Of Pointer (LOP) of STM-1 AU4
Alarm level Major alarm
Alarm type Communication alarm
Cause Unsynchronized clock of transmission equipment results in pointer adjustment.
Handling
1. Check whether CCS has a clock alarm;
2. Check whether RNC or transmission equipment has a clock alarm.
Loss Of Electrical Signal (LOS) of E1 Link
Item Contents
Description Loss Of electrical Signal (LOS) of E1 Link
Alarm level Major alarm
Alarm type Communication alarm
Cause
E1 line is not connected or connected with inverse receiving and transmitting; E1 cable is disconnected; local E1 receiving module or peer E1 transmitting module is damaged.
Handling
1. Check whether E1 line of the alarm link is connected properly or connected with inverse receiving and transmitting;
2. Make self-loop for the alarm link with E1 line. Node B is OK if the alarm disappears. Check whether peer equipment is normal;
3. Insert IIA to another slot, and make self-loop with E1 line. E1 cable or E1 transfer board fails and must be
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Item Contents
replaced if the alarm disappears and replace IIA if the alarm still exists.
Loss Of Frame (LOF) Synchronization of E1 Link
Item Contents
Description Loss Of Frame (LOF) synchronization of E1 Link
Alarm level Major alarm
Alarm type Communication alarm
Cause The clock is out of synchronization.
Handling
1. Check whether there are Loss of electric Signal (LOS) alarm on IIA;
2. Check whether there are lock alarms on the IIA;
3. Check the alarm status of CCS;
4. Reset the IIA;
5. Check whether the clock status of RNC or transmission equipment is normal.
Loss of Cell Delimitation (LCD) of E1 Link
Item Contents
Description Loss of Cell Delimitation (LCD) of E1 link
Alarm level Major alarm
Alarm type Communication alarm
Cause
1. The clock is out of synchronization;
2. The TC layer parameters for IMA connecting both parties are inconsistent.
Handling
1. Check the TC layer parameters for IMA connecting both parties. Modify them consistent if they are inconsistent;
2. Check whether the RNC has a clock alarm.
Loss of IMA Frame (LIF) of E1 Link
Item Contents
Description Loss of IMA Frame (LIF) of E1 link
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Alarm level Major alarm
Alarm type Communication alarm
Cause
1. The scrambling/descrambling parameters for IMA connecting dual-transmitting are set inconsistent;
2. The clock is out of synchronization.
Handling
1. Check scrambling/descrambling parameters for IMA connecting dual-transmitting. Modify them consistent if they are inconsistent;
2. Check whether the CCS has a clock alarm;
3. Check whether RNC has a clock alarm.
E1 IMA Group in Non-Working Status
Item Contents
Description The E1 IMA group is not in a working status.
Alarm level Major alarm
Alarm type Communication alarm
Cause
This alarm indicates E1 link in IMA group gets faulty, and IMA group is not in a working state, unable to receive/send data. All above E1 alarms may result in this alarm.
Handling
1. Make self-loop for E1 link in IMA group at Node-B side. Node B fails if the alarm still exists. Solve the problem step by step by with the method for solving other E1 alarms. Go on with Step 2 if the alarm disappears
2. Check whether both parties IMA settings (IMA version, scrambling/descrambling or not and frame length) are consistent. Modify them if they are inconsistent. Set IMA clock mode of Node B as ITC if doubting the clock fails. The clock is error and check clock boards of the peer end and local end if the alarm disappears. Make loop-back level by level to locate the section where the problem occurs if doubting E1 connection line fails.
PVC Error
Item Contents
Description PVC error
Alarm level Major alarm
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Item Contents
Alarm type Communication alarm
Cause ATM link error
Handling
Perform the link self-loop. If the alarm disappears, it indicates that Node B is normal. Check the opposite equipment. If the alarm still exists, replace the board.
Transmission Clock Abnormal
Item Contents
Description Transmission clock abnormal
Alarm level Minor alarm
Alarm type Communication alarm
Cause The board is not inserted tight. CCS clock unit error. Board error. Backplane error, etc.
Handling
1. Check whether there are clock type alarm on CCS;
2. Unplug and plug the IIA;
3. Replace the IIA.
Software Operation Failure
Item Contents
Description Software operation failure
Alarm level Critical alarm
Alarm type Error handling alarm
Cause Software version error or board error
Handling
1. Check whether there are software version alarm;
2. Reset the board;
3. Replace the board.
Board Configuration Parameter Error
Item Contents
Description Board configuration parameter error
Alarm level Major alarm
Alarm type Equipment alarm
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Cause Configuration parameter error or hardware error
Handling 1. Reset the board;
2. Replace the board.
Configuring IMA Group Failure
Item Contents
Description Configuring IMA group failure
Alarm level Major alarm
Alarm type Communication alarm
Cause Iub port already exists or parameter error
Handling
1. Confirm that parameter configurations are correct;
2. Delete this IMA group and configure again;
3. Reset the board;
4. Replace the board.
Configuring STM-1 Port Failure
Item Contents
Description Configuring STM-1 port failure
Alarm level Major alarm
Alarm type Communication alarm
Cause Iub port already exists or parameter error
Handling
1. Confirm that parameter configurations are correct;
2. Delete this IMA group and configure again;
3. Reset the board;
4. Replace the board.
Configuring TC Port Failure
Item Contents
Description Configuring TC port failure
Alarm level Major alarm
Alarm type Communication alarm
Cause Parameter error
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Item Contents
Handling
1. Confirm that parameter configurations are correct;
2. Delete this TC group and configure again;
3. Reset the board;
4. Replace the board.
Configuring PVC Failure
Item Contents
Description Configuring PVC failure
Alarm level Major alarm
Alarm type Communication alarm
Cause 1. Parameter error;
2. Hardware error.
Handling
1. Confirm that parameter configurations are correct;
2. Delete this PVC and configure again;
3. Reset the board;
4. Replace the board.
CPU Overload Alarm
Item Contents
Description CPU overload alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause High-layer software operation abnormal or board error, which results in frequent alarm reports.
Handling Observe whether there are alarms on the board and isolate the faulty board.
Board Hardware Error
Item Contents
Description Board hardware error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Equipment hardware error
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Handling Replace the error board
Optical Module Not-in-position
Item Contents
Description Optical module is not in position.
Alarm level Major alarm
Alarm type Equipment alarm
Cause Corresponding optical module is not in position or abnormal.
Handling Check whether the corresponding optical module is in position. If so, replace the corresponding optical module.
TAC Alarms
Software Operation Failure
Item Contents
Description Software operation failure
Alarm level Critical alarm
Alarm type Error handling alarm
Cause Software version error or board error
Handling
1. Check whether there are software version alarm;
2. Reset the board;
3. Replace the board.
Board Configuration Parameter Error
Item Contents
Description Board configuration parameter error
Alarm level Major alarm
Alarm type Equipment alarm
Cause Configuration parameter error or hardware error
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Item Contents
Handling 1. Reset the board;
2. Replace the board.
Board Hardware Local Channel Error
Item Contents
Description Board hardware local channel error
Alarm level Major alarm
Alarm type Equipment alarm
Cause Error of tower amplifier that TA corresponds to
Handling Replace the tower amplifier
Board Hardware Error
Item Contents
Description Board hardware error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Equipment hardware error
Handling Replace the error board.
EMU Alarms
Ambient Temperature Abnormal
Item Contents
Description Ambient temperature is abnormal.
Alarm level Major alarm
Alarm type Ambient alarm
Cause
1. The temperature is too high or too low (out of the temperature range that the system configures);
2. EMU board error
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Handling
1. Check whether the threshold of configuration parameters is too high or too low;
2. Check whether the ambient temperature is too high (low) with the thermometer;
3. Reset the EMU;
4. Replace the temperature sensor;
5. Replace the EMU.
Whole Equipment Temperature Rise Alarm
Item Contents
Description Whole equipment temperature rise alarm
Alarm level Major alarm
Alarm type Ambient alarm
Cause
Temperature difference at EMU intake and outtake detected by EMU is over 15 C. Possible causes
are:
1. Dust-proof net is blocked;
2. Fan error;
3. Temperature sensor error;
4. EMU board error.
Handling
1. Check whether there are alarms on fans;
2. Check whether the dust-proof net on racks are blocked;
3. Replace the two temperature sensors of set-top fans;
4. Reset the EMU;
5. Replace the EMU.
Clock Reference Source Loss
Item Contents
Description Clock reference source loss
Alarm level Alarming alarm
Alarm type Equipment alarm
Cause 1. EMU 2 MHz loss;
2. EMU 2 Mbps loss.
Handling 1. Check whether the clock reference source is configured;
2. Check whether there are external BITS. If so,
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Item Contents
check whether the BITS has clock output signals and whether it is normal;
3. Check whether the connection between BITS and EMU is correct.
Rack Power Abnormal
Item Contents
Description Rack power abnormal
Alarm level Major alarm
Alarm type Equipment alarm
Cause
1. 48 V over-voltage (over 57 V 1 V);
2. 48 V under-voltage (below 40 V 1 V);
3. EMU board error;
4. Lightening arrester error.
Handling
1. If it is the voltage alarm, use the multimeter to detect the rack power voltage. If the measured value is over or under voltage, it indicates that something is wrong with the voltage of 48 V power and it needs solution;
2. If it is the lightening arrester alarm, replace it to detect the alarm status. If the alarm disappears, it indicates that the lightening arrester is damaged and it is necessary to replace one;
3. Reset the EMU;
4. Replace the EMU.
Board Communication Link Disconnected
Item Contents
Description Board communication link disconnected
Alarm level Critical alarm
Alarm type Communication alarm
Cause 1. Communication cable error;
2. Board error.
Handling
1. The configured board should be inserted in the slot. If it is the middle transit board error, unplug it first;
2. Unplug the link disconnected board;
3. Replace the link disconnected board or middle transit board.
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Software Operation Failure
Item Contents
Description Software operation failure
Alarm level Critical alarm
Alarm type Error handling alarm
Cause Software version error or board error
Handling
1. Check whether there are software version alarms;
2. Reset the board;
3. Replace the board.
Board Configuration Parameter Error
Item Contents
Description Board configuration parameter error
Alarm level Major alarm
Alarm type Equipment alarm
Cause Configuration parameter error or hardware error
Handling 1. Reset the board;
2. Replace the board.
Fan Alarm
Item Contents
Description Fan alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause
1. Cable error;
2. Fan error;
3. EMU error.
Handling
1. Check whether there are alarms on the whole layer of fans. If so, check cables of EMU and fans;
2. Replace faulty fans;
3. Reset the EMU;
4. Replace the EMU.
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Temperature Sensor Not-in-position
Item Contents
Description Temperature sensor is not in position.
Alarm level Minor alarm
Alarm type Equipment alarm
Cause
1. Cables between EMU and fan layer is error;
2. Temperature sensor connection is error;
3. FCC or FCD error;
4. EMU error.
Handling
1. Check whether connection between the fan board in the layer that faulty temperature sensor locates and EMU is faulty;
2. Open corresponding fan layer to check whether the temperature sensor is connected to FC correctly;
3. Replace the FC board that the faulty temperature sensor corresponds to;
4. Reset EMU;
5. Replace EMU.
Father Node External Equipment Error
Item Contents
Description Father node external equipment error
Alarm level Alarming alarm
Alarm type Equipment alarm
Cause
1. External equipment error;
2. Father node connection error;
3. EMU error.
Handling
1. Check whether there are faults with external equipment;
2. Check whether connections between external equipment and father node is normal;
3. Replace the EMU.
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CPU Overload Alarm
Item Contents
Description CPU overload alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause High-layer software operation abnormal or board error, which results in frequent alarm reports.
Handling Observe whether there are alarms on the board and isolate the error board.
Board Hardware Error
Item Contents
Description Board hardware error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Equipment hardware is abnormal.
Handling Replace the error board.
TRXU Alarms
Clock Module Error
Item Contents
Description Clock module error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause
1. 61.44 M clock alarm;
2. 10 M clock alarm;
3. FR alarm;
4. FN alarm.
Handling
1. Check whether system clock signals are normal;
2. Check whether there are clock signal input on boards;
3. Check whether the connection between the
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Item Contents
board and the back plane is normal;
4. Check whether the board time receiving module is normal.
Downlink LVDS Link Error
Item Contents
Description Downlink LVDS link error
Alarm level Critical alarm
Alarm type Communication alarm
Cause
1. Upstream board LVDS transmitting module is abnormal;
2. LVDS link of corresponding backplane is abnormal;
3. Interface between board and backplane is abnormal;
4. Board LVDS receiving module is abnormal.
Handling
1. Make sure alarm board and backplane are in good contact;
2. Reset the alarm board;
3. Reset the upstream boards (RBI);
4. Replace the alarm board;
5. Replace the upstream boards.
Software Operation Failure
Item Contents
Description Software operation failure
Alarm level Critical alarm
Alarm type Error handling alarm
Cause Software version error or board error
Handling
1. Check whether there are software version alarm;
2. Reset the board;
3. Replace the board.
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Board Configuration Parameter Error
Item Contents
Description Board configuration parameter error
Alarm level Major alarm
Alarm type Equipment alarm
Cause Configuration parameter error or hardware error
Handling 1. Reset the board;
2. Replace the board.
CPU Overload Alarm
Item Contents
Description CPU overload alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause High-layer software operation abnormal or board error, which results in frequent alarm reports.
Handling Observe whether there are alarms on the board and isolate the faulty board.
Board Hardware Local Channel Error
Item Contents
Description Board hardware local channel error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Transmitting or receiving channel error
Handling Replace the tower amplifier
Board Hardware Error
Item Contents
Description Board hardware error
Alarm level Critical alarm
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Item Contents
Alarm type Equipment alarm
Cause Equipment hardware error
Handling Replace the error board
BP Alarms
Clock Module Error
Item Contents
Description Clock module error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause
1. 61.44 M clock alarm;
2. 10 M clock alarm;
3. FR alarm;
4. FN alarm.
Handling
1. Check whether system clock signals are normal;
2. Check whether there are clock signal input on the board;
3. Check whether the connection between the board and the backplane is normal;
4. Check whether the board clock receiving module is normal.
Uplink LVDS Link Error
Item Contents
Description Uplink LVDS link error
Alarm level Major alarm
Alarm type Communication alarm
Cause
1. LVDS link of corresponding backplane is abnormal;
2. Interface between the board and the backplane is abnormal;
3. Board LVDS receiving module is abnormal.
Handling 1. Determine whether the board and the backplane is well connected;
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Item Contents
2. Reset the RBI;
3. Reset the corresponding TRXU;
4. Replace the RBI;
5. Replace the corresponding TRXU.
Uplink Path Operation Abnormal
Item Contents
Description Uplink path operation is abnormal.
Alarm level Major alarm
Alarm type Equipment alarm
Cause 1. Internal communication error;
2. Hardware error.
Handling 1. Reset or unplug the board;
2. Replace the BP.
Downlink Path Operation Abnormal
Item Contents
Description Downlink path operation is abnormal.
Alarm level Critical alarm
Alarm type Communication alarm
Cause BP high-layer software and DSP communication error
Handling 1. Reset or unplug the board;
2. Replace the BP.
Software Operation Failure
Item Contents
Description Software operation failure
Alarm level Critical alarm
Alarm type Error handling alarm
Cause Software version error or board error
Handling
1. Check whether there are software version alarm;
2. Reset the board;
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Item Contents
3. Replace the board.
Board Configuration Parameter Error
Item Contents
Description Board configuration parameter error
Alarm level Major alarm
Alarm type Equipment alarm
Cause Configuration parameter error or hardware error
Handling 1. Reset the board;
2. Replace the board.
CPU Overload Alarm
Item Contents
Description CPU overload alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause High-layer software operation abnormal or board error, which results in frequent alarm reports.
Handling Observe whether there are alarms on the board and isolate the faulty board.
Board Hardware Error
Item Contents
Description Board hardware error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Equipment hardware is abnormal.
Handling Replace the error board.
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Signal Receiving Path Quality Abnormal Alarm
Item Contents
Description Signal receiving path quality abnormal alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause Receiving path error
Handling Check whether the RF cable interface (including antenna interface) of corresponding path is loose.
RDM Alarms
Clock Module Error
Item Contents
Description Clock module error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause
1. 61.44 M clock alarm;
2. 10 M clock alarm;
3. FR alarm;
4. FN alarm.
Handling
1. Check whether system clock signals are normal;
2. Check whether there are clock signal input on the board;
3. Check whether the connection between the board and the backplane is normal;
4. Check whether the board clock receiving module is normal.
Antenna VSWR Exceeding 3.0
Item Contents
Description The antenna VSWR (Voltage Standing Wave Ratio) exceeds 3.0.
Alarm level Critical alarm
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Item Contents
Alarm type Equipment alarm
Cause The backplane and RF cable are not in good contact.
Handling
1. Unplug and plug RDM board to make sure it is in good contact with the backplane;
2. Check to make sure antenna at DDL antenna interface is screwed tight;
3. Check to confirm if water enters the antenna;
4. Reset RDM.
Antenna VSWR Exceeding 1.8
Item Contents
Description The antenna VSWR exceeds 1.8.
Alarm level Major alarm
Alarm type Equipment alarm
Cause The backplane and RF cable are not in good contact.
Handling
1. Unplug and plug RDM to make sure it is in good contact with the backplane;
2. Check to make sure the antenna at the DDL antenna interface is screwed tight;
3. Check to confirm if water enters the antenna;
4. Reset RDM.
Calibration Interface Over-power Alarm
Item Contents
Description Calibration interface over-power alarm
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Power at calibration interface is over 30 dBm.
Handling
1. Check whether there are RF cables connected with DDL antenna interface at RDM calibration interface. If so, go on with Step 2. If not, go on with Step 3;
2. Check whether there are local cells in TRXU connecting DDL RF cables. If so, block this local cell;
3. Reset the RDM.
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Software Operation Failure
Item Contents
Description Software operation failure
Alarm level Critical alarm
Alarm type Error handling alarm
Cause Software version error or board error
Handling
1. Check whether there are software version error;
2. Reset the board;
3. Replace the board.
Board Configuration Parameter Error
Item Contents
Description Board configuration parameter error
Alarm level Major alarm
Alarm type Equipment alarm
Cause Configuration parameter error or board error
Handling 1. Reset the board;
2. Replace the board.
CPU Overload Alarm
Item Contents
Description CPU overload alarm
Alarm level Major alarm
Alarm type Equipment alarm
Cause High-layer software operation abnormal or board error, which results in frequent alarm reports.
Handling Observe whether there are alarms on the board and isolate the faulty board.
Board Hardware Error
Item Contents
Description Board hardware error
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Item Contents
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Equipment hardware is abnormal.
Handling Replace the error board
LPA30 Alarms
Board Hardware Error
Item Contents
Description Board hardware error
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Equipment hardware is abnormal.
Handling Replace the error board.
Link Disconnected between LPA30 and EMC
Item Contents
Description Link between LPA30 and EMC is disconnected.
Alarm level Critical alarm
Alarm type Communication alarm
Cause 1. Communication cable is error;
2. LPA30 fails.
Handling 1. Unplug and plug the LPA30;
2. Replace the LPA30.
Over-power Alarm
Item Contents
Description LPA30 over-power alarm
Alarm level Critical alarm
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Alarm type Equipment alarm
Cause Possibly signal power of power amplifier LPA30 input port, exceeds maximum output power 2dB.
Handling
1. Enable protected power amplifier;
2. Reset or restart the alarm power amplifier LPA30;
3. Replace the TRXU;
4. Replace the LPA30.
Over-VSWR Alarm: VSWR2.8
Item Contents
Description LPA30 over-VSWR alarm, VSWR2.8
Alarm level Critical alarm
Alarm type Equipment alarm
Cause
Matching of power amplifier LPA30 port may fail (for example, cable output to the duplexer is not in good contact, or duplexer output port is not in good contact with the feeder).
Handling
1. Check whether power amplifier cable output to the duplexer is in good contact, and whether cable connector is screwed tightly;
2. Check whether connectors between duplexer output port and feeder and between antenna and feeder are screwed tightly;
3. Reset the LPA30;
4. Replace the LPA30.
Over-Temperature Alarm
Item Contents
Description LPA30 over-temperature alarm
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Power amplifier layer may fail in heat sinking. For example, fans on the power amplifier layer work abnormally.
Handling
1. Confirm if EMU generates a heat-sinking fan alarm on power amplifier layer;
2. Enable protected LPA30 board and make a recovery attempt;
3. Reset the LPA30;
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Item Contents
4. Replace the LPA30.
Over-Current Alarm
Item Contents
Description LPA30 over-current alarm
Alarm level Critical alarm
Alarm type Equipment alarm
Cause Possibly power amplifier LPA30 fails.
Handling
1. Enable protected LPA30 board and make a recovery attempt;
2. Reset the LPA30;
3. Replace the LPA30.
LPA30 VSWR Alarm, 2.8>VSWR1.8
Item Contents
Description LPA30 VSWR alarm, 2.8>VSWR1.8
Alarm level Major alarm
Alarm type Equipment alarm
Cause Matching of power amplifier LPA30 port may fail.
Handling
1. Check to make sure that power amplifier cable output to duplexer is in good contact and cable connector is screwed tightly;
2. Check to make sure that connectors between duplexer output port and feeder and between antenna and feeder are screwed tightly.
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C h a p t e r 5
Troubleshooting Examples
This chapter introduces some common problems during routine operation and maintenance of the ZXWR B09, and presents symptoms, possible causes and solutions.
Overview Table 6 shows possible problems during routine maintenance of the ZXWR B09.
T AB L E 6 CO M M O N P R O B L E M S I N RO U T I N E M AI N T E N AN C E
Classification Problem Remarks
System monitoring
CPU utilization too high
See High CPU Utilization
Decreased cell radius of BTS coverage
See Decreased Radius of BTS Coverage
User complaint
Difficult call connection
See Difficult Call Connection
Poor call quality See Poor Call Quality
Slow to access Internet
See Slow to Access Internet
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System Monitoring
High CPU Utilization
Symptoms and Effects
Alarm man-machine interface of operation and maintenance console has a CPU utilization alarm reported, or CPU utilization exceeds normal value for a long time when monitoring CPU utilization at performance management man-machine interface.
High CPU utilization is of great concern. Processing capability of the system decreases if CPU of CCS is at a high utilization for a long time. It results in sharp rise of call loss and may cause memory exhaustion or system breakdown.
Causes
Rise of CPU utilization of a board (particularly CCS board) may result from:
1. The system is busy currently, for example, high traffic.
2. Too many measurement tasks are set, and there are more measurement report messages.
3. The system has a local emergency fault, causing a large number of alarm messages reported
Handling
Analyze the cause and take appropriate measures in case of high CPU utilization ratio for a long time.
1. Locate the fault and isolate it by blocking failed board and parts or using other methods if there is a large amount of burst alarm reports.
2. Adjust measurement strategy properly if there are too many measurement message reported, for example, cancel some less important measurement tasks or change the period when performing measurement tasks.
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Decreased Radius of BTS Coverage
Symptoms and Effects
Conversation quality at the edge of cell decreases, and measurement with instruments shows that coverage radius of BTS signals decreases.
Causes
1. Some radio parameters are set improperly, particularly pilot channel transmitting power and forward transmitting power, which affects actual coverage of BTS.
2. Surrounding landform and geographical feature changes, for example, urban construction, also affect actual coverage.
3. Interference in space electromagnetic environment causes pilot pollution.
4. Antenna feeder system gets faulty.
Handling
Conduct an on-site survey and detailed spectrum test near the site, and configure radio parameters again based on ambient characteristics and test result. It is better to let professional network optimization personnel perform this task.
User Complaints
Difficult Call Connection
Symptoms and Effects
Users complain that call completion rate (successfully connected to called party) decreases significantly and calls cannot be connected at all in extreme cases.
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Causes
Call completion rate is a basic index to evaluate overall performance of the system. A great variety of factors may affect it, inclu