BSS TROUBLESHOOTING GUIDE 1 BSC
2 RNC
3 TRANSMISSION
4 BTS
BSS TROUBLESHOOTING GUIDE
OSS connectivity down - both x.25 down One X.25 down NSEI Down BVCI Down Zero Voice calls on particular Cell Unit re-start SIGNALLING LINK OVERLOAD SIGNALLING LINK DOWN SIGNALLING LINK ACTIVATION OR RESTORATION FAILURE SIGNALLING LINK SET DOWN GPRS/EDGE LOAD IS VERY HIGH IN PCU OF PSE BTS AND TC UNSYNCHRONIZATION CLEAR CALLS ON ABIS INTERFACE WDU FAULTY STMU FAULTY MCMU RESTART BCSU RESTART BCSU SWITCHOVER
Iu-CS link down Both Iu-PS links down One Iu-PS link down BASE STATION FAULTY BASE STATION OPERATION DEGRADED BASE STATION NOTIFICATION CELL FAULTY CELL OPERATION DEGRADED CELL NOTIFICATION BASE STATION LICENCE NOTIFICATION BASE STATION TRANSMISSION ALARM BEATING WCDMA BTS ALARM FAILURE IN WCDMA WBTS O&M CONNECTION RNW O&M SCENARIO FAILURE WCDMA CELL OUT OF USE HSDPA CONFIGURATION FAILED WCDMA BTS DEDICATED MEASUREMENT FAILURE HSUPA FAILURE IN WCEL WCDMA BASE STATION OUT OF USE
BFD Down in AXC (Tellabs) 3G Sites down 2G or 3G sites down (Mw ring collapsed) 2G/3G multiple sites down
SYNCHRONISATION IS MISSING Some Subscribers not able to latch on TATA network from specific handsets Rx levels differ too much between main and diversity antennas, RSSI detected Rx signal difference exceeding EXxx TRX module cooling fan s report no rotation,ESMA System module cooling fan s report no rotation ERxx DDU module has detected VSWR above minor limit at anten
Problem
Alarm No. at BSC
Alarm Description / Comments
Catergory
Service affecting
S. No.
OSS connectivity down - both x.25 down
2175
OSI CLNS LINKAGE NOT AVAILABLE
non-Service affecting
1
2175
3
NSEI Down
3315
ALL NETWORK SERVICE ENTITIES UNAVAILABLE
4
BVCI Down
Service affecting
One X.25 down
NonService affecting
Service affecting
2
OSI CLNS LINKAGE NOT AVAILABLE
BVCI Down
5
Zero Voice calls on particular Cell
7738
BTS WITH NO TRANSACTIONS
7
SIGNALLING LINK OVERLOAD
26
SIGNALLING LINK LOAD OVER THRESHOLD
8
SIGNALLING LINK DOWN
1072
SIGNALLING LINK OUT OF SERVICE
9
SIGNALLING LINK ACTIVATION OR RESTORATION FAILURE
2072
FAILURE IN SIGNALLING LINK ACTIVATION OR RESTORATION
10
SIGNALLING LINK SET DOWN
2070
LINK SET UNAVAILABLE
Service affecting
11
GPRS/EDGE LOAD IS VERY HIGH IN PCU OF PSE
3415
GPRS/EDGE LOAD IS VERY HIGH IN PCU OF PSE
NonService affecting
12
BTS AND TC UNSYNCHRONIZ ATION CLEAR CALLS ON ABIS INTERFACE
2993
BTS AND TC UNSYNCHRONIZATION CLEAR CALLS ON ABIS INTERFACE
Service affecting
Service affecting
4
13
DISK FAILURE
2860
DISK FAILURE
WDU FAULTY
2861, 2692
15
STMU FAULTY
2794
HW BLOCK FAILURE IN PLUG-IN UNIT
Service Threatening
INCORRECT WORKING 2692 STATE MCMU RESTART 0690,1001 working State Changed , Unit restarted
Service Threatening
non-Service affecting
14
NO ACCESS TO DISK ,INCORRECT WORKING STATE
16
INCORRECT WORKING STATE working State Changed , Unit restarted
18
BCSU SWITCHOVER
2692 0690 1001
INCORRECT WORKING STATE working State Changed Unit Restarted
Service Threatening
19
Loss of Synchronization in BSC
2,641
Failure in Synchronization Signal
Service Threatening
Service affecting
BCSU RESTART
2692 0690 1001
17
Affect / Steps to be follow for troubleshoot
1. Check the signalling links states at MSS end 2. If signalling links / link set down means BSC down(Alarm-Link Set Unavailable) 3. Send local engineer at BSC site 4. Check BSC end Mux status & alarm. 1st: Mux unmanaged - check alarm at connected Mux, Power issue at BSC site. 2. Mux managed - check alarm at Mux & verify the power status for BSC. 5. Login BSC via VDU / LANU. Check the alarms & current computer unit status, if login is possible.In case login is not possible ,get login through OMU CPU and check the status of OMU and other computer units.If we will not get the login through OMU also ,raise the emergency and follow steps as per with care team recommandation.
1. Check the signalling links states at MSS end 2. If Signalling links found ok, Check the voice & data traffic at MSS & PACO end (normal or any 3. Check the Transmission path - Is there any alarm in X.25 E1 path / path broken, then re-route path & check X.25 links status. 5. If media ok, Send local engineer at BSC site 6. Locally login the BSC via VDU / LANU & check the alarms. Reset the X.25 ET as well as X.25 links. 7. If BSC not login via VDU / LANU than login through CPU of OMU unit and check the status: after login ask for password then login ok, or if continuously restarting phase means OMU unit faulty. Do as per care team recommendations. 1. Check the Transmission path - Is there any alarm in X.25 E1 path / path broken. 2. Check the alarms. If PCM ok then reset the X.25 ET as well as X.25 links from BSC . Data traffic affect, down Check no. of NESI's down, if down all - Trace PCU IP from SGSN & find last hop address & check media B/W that hop to BSC If only some NSEI down (one or two) follow below steps 1. Check the PCU - BCSU combination 2. Ping SGSN (PAPU) IP from that BCSU-PCU 3. Trace PCU IP from SGSN 4. Shift the traffic (DAP) to other PCU-BCSU 5. During MW Hrs diagnose that BCSU. 1. Diagnose ok make BCSU in WO state and observe the alarm & Data traffic affect, down 1. GENA toggle & check status.
2. Check PCU-BCSU combination: (a) In case a particular PCU-BCSU combination: shift the(b)traffic to other PCU & Switchover in MW PCU-BCSU combination random BCSU on many BCSUPCU combinations - Traffic prevent - unprevent from (c) BCSU switchover. (d) PAPU re-set / switchover . Check hardware, cabling & commissioning
Check UP/DL quality, path imbalance/VSWR/RSSI
This notice appears repeatedly - consider adding more signalling links A signalling link has failed and changed state from IN SERVICE to OUT OF SERVICE, or its initial alignment attempt has failed. Check the Transmission path If there are other path available, signalling links path re-route with discussion with planning team The activation or restoration of a signalling link fails. Signalling transmission capacity decreased. Check the Transmission path If there are other path available, signalling links path re-route with discussion with planning team All signalling links in the signalling link set are Check alarm: 2064 - ROUTE SET UNAVAILABLE. If this alarm means no route is available Check present for the end to end connectivity for the Aters carrying signalling (MSC,TXN and BSC), transmission Check GPRS/EDGE load & balance the load by reallocate the DAPs Thershold value need to be change or PCU addition require if load balancing ok.
Impact: Call drop, Quality degradation, Call muting Check the Transmission Media, if not ok then clear the path issue. If Transmission Media found OK, then check the timeslot mapping between bts and bsc should be checked. if mapping is fine, timeslot bypassing should be checked for the problem BTS/TRX, and if it is coming on more than one timeslot, and everything else is fine, trx should be replaced and call test should be done on all time slots after replacement. If it is coming for only one timeslot, the time may be The system has detected a serious errorslot that may have been caused by the hard disk or the SCSI controller plug-in unit breaking down.Saving data into the hard disk or reading data from the hard disk fails.Run the diagnosis on the faulty hard disk and if
Impact: No hard disk Redundancy, Measurements might be affected. 1.Check the WDU state with ZISI :; commands . Alarm history and current alarm should be checked. If it is one WDU or both WDU are in BL-SY state . 2. Perform the JOJI of harddisk ( with JOJI the HDSAM ) and DCAR card .perform the OMU restart and check .if problem reolved, perform the diagonisis of WDU 1. Check the status of STMU with ZUSI:STMU:; commands. Check the current & History alarms & Site/aters outage if any related to faulty STMU. 2. Check the supplementary information of alarms & work as per information . 3. Clear the faulty tag with ZUST command and observe. 4. Check the alarms of ET/ transmission and set loss with ZYWI command. 5. Temperature condition need to check at BSC location. 6. Check the STMU cabling and if required replace the Hardware.
1. Check the status of computer units with ZUSI:COMP:; commands. Check the current & History alarms. 2. Check the supplementary information of alarms & work as per information (switchover / diagnose). 3. check ZIGO & ZUDH. 4. Change the state of MCMU to SE-NH and perform the JOJI of all cards og MCMU and GSW .after Diagonise the unit and check. 4. if problem repeates on same MCMU ,replace the hardware with help of alarm info. 5. Perform the diagonistics of that MCMU /EMB and make it in working State. 6. If no alarm found or problem occur on different different units with same alarm Number it may be a SW bug. Note : Kindly note before switchoff the MCMU respective MCMU and EMB should be in SE-NH state also during any hardware replacement check the Jumper setting of the card.during any hardware replacement check the Jumper setting of the card.
1. Check the status of computer units with ZUSI:COMP:; commands. Check the current & History alarms. 2. Check the supplementary information of alarms & work as per information (switchover / diagnose). 3. check ZIGO & ZUDH. 4. if problem repeates on same BCSU ,replace the hardware with help of alarm info. 5. Perform the diagonistics of the BCSU with both MCMU and make it in working State. 6. Check the BVCI state and lapd States 7. If no alarm found or problem occur on different different units with same alarm Number it may be a SW bug. Note : During any hardware replacement check the Jumper setting of the card accordingly. 1. Check the status of computer units with ZUSI:COMP:; commands. Check the current & History alarms. 2. Check the supplementary information of alarm & work as per information (switchover / diagnose). 3. check ZIGO & ZUDH. 4. if problem repeates on same BCSU ,replace the hardware with help of alarm info. 5. Perform the diagonistics of the BCSU with both MCMU and make it in working State. 6. Check the BVCI and Lapd state. 7. If no alarm found or problem occur on different different units with same alarm Number it may be a SW bug. Note : During any hardware replacement check the Jumper setting of the card accordingly. 1. Check the ZDRI :; command output with Current alarms. 2. Check the ET alarms on Sync ET . 3. Disconnect the all sync with ZDRC command ,setthe ossilator control word value to 32000 on both CLS and reconnect the all sync inputs with correct priority. Note : If any BSC is out of Sync ,there will be slip on all ETs of that BSC .
S. No.
Problem
1
Iu-CS link down
2
Both Iu-PS links down
3
One Iu-PS link down
BASE STATION FAULTY
Alarm No. at RNC
Cateagory
Impact
2070
LINK SET UNAVAILABLE
SA
RNC Total Outage
2070
LINK SET UNAVAILABLE
SA
RNC data traffic outage
2070
LINK SET UNAVAILABLE
NSA
No Data traffic outage
No connection to Flexi transport submodule
SA
Transmission to NodeB will be affected
BTS reference clock missing
SD
Service will be affected based on the degradtion threshold level
BTS RNC/IHSPA interface signalling link failure
SA
NBAP/AAL2 signalling link failure
System module failure
SA
NodeB Capacity may be reduced/NodeB totally may not be opreational
7650
4
5
BASE STATION OPERATION DEGRADED
Alarm Description / Comments
7651
BTS requires restart because license status has changed
6
7
BASE STATION NOTIFICATION
CELL FAULTY
7652
7653
SA
BTS time not corrected
NSA
BTS time will not be correct
Difference between BTS master clock and reference frequency
NSA
BTS frequecy deviates from IuB referecne
Fan failure
NSA
Temparature will be increased
Heating element not working
SA
Heating from the heating element is not available. The module temperature may not reach the working level or may reach it very slowly
Temperature alarm
SA
Depending on severity BTS Capacity may be reduced/BTS totally may not be opreational
SA
Depending on severity BTS Capacity may be reduced/BTS totally may not be opreational Depending on severity BTS Capacity may be reduced/BTS totally may not be opreational Sectors will be affected depends on severity Depending on severity BTS Capacity may be reduced/BTS totally may not be opreational
SA
Sectors Operation will be degraded
NSA
Sectors Operation will be degraded
Failure in optical RP3 interface Incompatible SW version detected RF module failure VSWR alarm RF module failure
8
CELL OPERATION DEGRADED
7654
Mentioned licence feature will not work
Rx signal level failure
9
CELL NOTIFICATION
7655
Radio resources switched off HW capacity too low for feature 308, Licence Based BTS channel c
10
11
BASE STATION LICENCE NOTIFICATION
BASE STATION TRANSMISSION ALARM
SA
NSA
Cell will be down
The licenses are granted but cannot be used. Some of the licensed features are not available.
Licence missing 00000001125, Flexi WCDMA BTS 60W Power License
SA
Sector down
Licence missing 0000000306, HSDPA 16QAM SW Licence Support
SA
SDPA Traffic will affect
Licence missing 0000000307, HSDPA Proportional Fair Resource Pac
NSA
Degradation
Licence missing 0000000649, Shared HSDPA Scheduler for Baseband
NSA
Degradation
Verification of target ID failed 3 times.
SA
Degradation of system module
7661
7665
License missing for feature Additional 2 E1, T1, JT1 interface o
Service Degraded SA
11
BASE STATION TRANSMISSION ALARM
7665
SA License missing for feature UBR+.
12
13
14
15
Cell Down
BEATING WCDMA BTS ALARM
7740
(blank)
NSA
Repeatation of any alarm causes
FAILURE IN WCDMA WBTS O&M CONNECTION
7750
(blank)
NSA
BTS Cannot be logined remotly & Measurements will not be updated
RNW O&M SCENARIO FAILURE
WCDMA CELL OUT OF USE
7761
7771
AAL2 path unblock not accomplished BCCH information updating has failed Common channel deletion has failed
Cell Down
Cell Down
SA Cell Down
NBAP interface type unknown failure
Cell Down
Block resource request, normal priority
Sector down
Common measurement failure scenario
Sector down
NBAP link failure
SA
Sector down
Resource status indication, cell disabled
Sector down
WCEL state not WO
Sector down
WCEL state not WO after setup
When Site Down Or Sector Down
RNC internal error 16
HSDPA CONFIGURATION FAILED
7772
Service Degraded SD
WBTS rejects the configuration
WCDMA BTS DEDICATED MEASUREMENT FAILURE
7778
Service Degraded
SA
DCN state - Disable Or Cell Faulty
17 A unit (or units),taking care of HSUPA traffic in the WCEL can be faulty 18
HSUPA FAILURE IN WCEL
7780
SA
A unit (or units),taking care of HSUPA traffic in the WCEL can be faulty A unit (or units),taking care of HSUPA traffic in the WCEL can be faulty
19
WCDMA BASE STATION OUT OF USE
7786
(blank)
SA
WBTS will be down
Affect / Steps to be follow for troubleshoot Possible Causes
Solution
Affects: Communication with MSS down: Total outage 1. Check the unit status for any failure and check the current and history alarms 2. Ping & trace MSS control plane and user plane IP 3. Check Association set and association links status and end IP 4. Check connectivity B/W end trace IP to MSS. Affects: Communication with Both SGSN down: Total data Traffic outage 1. Check the unit status for any failure and check the current and history alarms 2. Ping & trace SGSN control plane and user Association plane IP 3. Check set and association links statusB/W andend endtrace IP 4. Check connectivity IP to MSS. Affects: Communication with one 1. Check the unit status for any failure and check the current 2. Ping & trace SGSN control plane and user Association plane IP 3. Check set and association links statusB/W andend endtrace IP 4. Check connectivity IP to MSS. Malfunction of Transport Module in System Module
Reset System Module/Replace Transport Module in System Module
Site Clock E1 having errors / AIS
Clock E1 Interface needs to be check & Check the SYNC of TXN side
Transmission break or fluctuations
Check transmission configurations and paths
Abnormal functioning of FSM
Reset FSM/Replace FSM
After licence installation BTS not given restart
Restart BTS.
NTP Server IP mismatch
Check NTP server IP it should be same as RNC OMS IP
DAC Valure variations
Set DAC value to standard value
H/W Faulty
Check working status of Fans or replcae FAN units in FSM
Check whether the heating element The heater control connection of the exists at all./ Check the heater FSM is faulty, there is no heater or control connection and that the the heater is faulty. heater is working./ Replace the alarming component. The internal temperature of the RF Module or System Module exceeds the threshold value, or the ambient temperature of the module(s) is outside the specified limits.
Check the FAN units in FSM/FRGP
Abnormal/ failure in optical cable between FSM & FRGP
Check the Optical cable connecton between FSM & FRGP/Reset FSM/Replace cable.
SW Mismatch of BTS
Recomission BTS with Correct SW version
Abnormal functioning of FRGP
Reset FRGP/FSM/Check interface cables/Replace FRGP
High VSWR
Check the VSWR, should be less than 1.3
Abnormal functioning of FRGP
Reset FRGP/FSM/Check interface cables/Replace FRGP
The RX signal level is less than 112dBm or the difference between the maximum and minimum power Check the VSWR & Antenna cables levels of all RX antennas in the same cell and sector is more than the limit (4 dB).
As per configuration H/W mismatch/unavailability
Check the cell configration & H/W availbilty at site
The HW capacity is too low to support all licenses of an optional feature.
Call to GNSC CM Delete the licenses or insert new hardware.
During NodeB commissioning seleted Login to nodeB and change 60W power for sector. parameters of sector power to 20W
HSDPA License Missing Or Cell Down Call to GNSC CM get it clear
License missing
License missing
License missing
License missing
Hanged/config issue/comm issue
Hanged/config issue/comm issue
This basic license missing
GNSC has to load this basic license from Netact
HSDPA License Missing
GNSC has to load this basic license from Netact
Repeatation of any alarm causes
Cancels once causing Alarm is cleared
DCN Configuration mismimatch in NodeB/RNC/tellabs
To be checked DCN Configrations at RNC/NodeB/Tellabs
To be checked CoCo/ATM CoCo/ATM Configuration Mismatches Configuration Mismatches between between NodeB/RNC/Tellabs NodeB/RNC/Tellabs To be checked CoCo/ATM CoCo/ATM Configuration Mismatches Configuration Mismatches between between NodeB/RNC/Tellabs NodeB/RNC/Tellabs To be checked CoCo/ATM CoCo/ATM Configuration Mismatches Configuration Mismatches between between NodeB/RNC/Tellabs NodeB/RNC/Tellabs To be checked CoCo/ATM CoCo/ATM Configuration Mismatches Configuration Mismatches between between NodeB/RNC/Tellabs NodeB/RNC/Tellabs
Cell Down
Need to check WCELL/WBTS alarm
Cell Down
Need to check WCELL/WBTS alarm
Cell Down
Need to check WCELL/WBTS alarm
Cell Down
Need to check WCELL/WBTS alarm
Cell Down
Need to check WCELL/WBTS alarm
Cell Down
Once Node-b is up, alarm will clear
Node-B Lock & Unlock Or Restart Node-B / Cross check & Rectify Cell Down / Interface Down Or H/W Node-B H/W Configuration --All This configuration In Node-B action based on Sublimentory information of Alarm Node-B Lock & Unlock Or Restart Cell Down / Interface Down Or H/W Node-B / Cross check Node-B H/W configuration In Node-B Configuration --All This action based on supplementary Alarm Info. DCN Interface / Lock all the cells under the BCF and delete & ReDCN connected E1 Interface needs to create COCO configuration and be cross check unlock all the cells / If required Site reset has to be given ( Anlaysis based on supplementary info) Cell Down
A unit (or units),taking care of HSUPA traffic in the WCEL can be faulty
Cell Down
A unit (or units),taking care of HSUPA traffic in the WCEL can be faulty
Cell Down
A unit (or units),taking care of HSUPA traffic in the WCEL can be faulty
CNBAP/BRM Break
Check the transmission path & Configuration between NodeB to RNC
Problem
Alarm No. at BSC
Alarm Description / Comments
1
BFD Down in AXC (Tellabs)
7665
BFD down
2
3G Sites down
3
4
5
2G or 3G sites down (Mw ring collapsed)
2G/3G multiple sites down
M/W Link Problem
No Alarm observed in the link, except RSL dip at one end.
Catergory
Service Degradation
Base Station out use
Service affecting
Fault rate monitoring & PCM failures
Service affecting
Fault rate monitoring & PCM failures
Service affecting
At one end, RSL of the link is OK, on other end it dips to -90dBm. No typical alarm observed in the link.
Service Threatning
S. No.
Affect / Steps to be follow for troubleshoot BFD down or fluctutating in AXC & data traffic shifted to ATM, Cause HSPA fallback enabled. Checked txn media as well as ISA card or reset Mux ISA card to restore BFD. Need to check utilization of GE ports, If broadcast packets incresing then need to check the txn- media & ISA card. Deimplement trails for culprits ISA & raplace ISA ASAP. Downs sites need to be check belongs particular AXC card or Mux particular STM-1 port. Need to check alarms on port, If any alarm appears then switch to redundant port to restore sites If the CPU utilization for both Main & Spare IFMcard are hign then remove one by one & inserted Main card to reduce CPU utilization. Atlast switched CDC card from main to redundant card.
Need to check alrams on ALU mux port during ring collapsed at both end. Need to ping connecting IDU from GNOC to check alarms & w.r.t appeared alarms we identify either power issue or hardware fault Enginners need to send at site with hardware for further trouble shooting. Sites need to be indentified on particular MUX Core mux malfunctioning at BSC/RNC location 2G & 3G site database shared with all CTLs Impact: Microwave Link gets down Reason of the problem: Normally in this type of scenario, ODU of the link (at the end where RSL is OK) is misbehaving. Its transmitor gets off, stops radiating. But, it receives the signal properly.
Troubleshooting: ODU to be replaced
S. No. Problem
1 SYNCHRONISATION IS MISSING All External Q1 device fail to respond
BTS Type
Flexi/MR
2 a)Some Subscribers were not able Flexi Edge to latch on TATA network from BTS specific handsets.While Same Handsets were running fine with IDEA or any other operator from a perticular site (N_UW_NRA_001,Muzzafarnagar)
Alarm Alarm Description / Comments No. at BSC 7787 DFCA not working in that particular Site,One more Observation:Site will continously restart when DFCA is enabled in the site
Observation:At Problematic location/Premises(N_UW_NRA_001,Muzzafa rnagar) there are two NSN equipments serving for IDEA/TATA.No alarm was found on problematic site.
3 Rx levels differ too much between Flexi main and diversity antennas, RSSI detected Rx signal difference exceeding threshold
7607 Rx levels differ too much between main and diversity antennas, RSSI Value is high than 10.
4 EXxx TRX module cooling fan s report no rotation,ESMA System module cooling fan s report no rotation
Flexi
7607 TRX cooling fan not rotate ESMA cooling Fan not rotate
5 a)ERxx DDU module has detected VSWR above minor limit at anten
Flexi/MR
7607 VSWR limit is high than 1.5 for Minor alarm and >2.7 for major alarm
Catergory
Affect / Steps to be follow for troubleshoot
Service affecting 1.First step to check the site is down or not (ZEOL) 2.if site is working with DFCA unsync and LMU is in stand by mode (ZEFL) than visit the site 3.Check the parameters such as LMU area parameter,DFCA disabled or enabled 4.Check ESLA cable connectivity between ESMA to LMU ,if found any Service affecting Activities steps as follow:1.Firstly we Check Infra condition of the site 2.Check the BTS configuration of the site ,properly check weather there is any alarm in site,But no service affecting/Service degrading alarm found 3.After that we check DAC value,RSSI comparision value and VSWR value with Site master but problem not resolved. 4.Change the PLMN allowed from 1 upto 7. 5.Replaced the ESMA card. 6.Shift BCCH to another TRX and check 7.Shift BCCH to another TRX and check. 8.Swapping of TRX's from other perfet site to problamatic site and check. 9.Site deletion and further recreation done still no improvement found 10.Rehome the site BCF-22/ Muzaffarnagar BSC to Meerut -1 BSC with Service 1.Check the RSSI measurements with BTS Manager. Degrading 2.Check the BTS RF cables and connections.Check the antenna and RX cabling. 3.If the antenna and RX cabling are faulty, correct the problem and run TRX test to cancel the alarm. 4.Check and measure VSWR of the antenna lines. Service 1.90% there is a chance of Over heating or Room tempurature high inside Degrading shelter 2.if there in an issue of tempurature resolve the issue along with IP 3.Check that the fan unit cable is correctly connect to DTRX/ESMA 4.Check that there are no obstacles preventing the fan(s) from rotating 5.Clean the fan unit of dust and/or dirt 6.if problem is still presist then Replace the fan unit service affecting 1.Measure VSWR value with Site Master ,If value is found high then second step is to see the fault via Distance to fault location . 2.According to distance found, replace connector,Jumper ,Anteena or damaged feeder cable 3.With external test equipment check VSWR of the antenna line. Repeat step 1 if the measurement is again high
D:\userdata\alekar\ Desktop\BSS Fault
D:\userdata\alekar\ Desktop\BSS Fault
BCF Alarm Guide
