BSS Troubleshooting Guide (2)

BSS TROUBLESHOOTING GUIDE

1 BSC

2 RNC

3 TRANSMISSION

4 BTS

BSS TROUBLESHOOTING GUIDE

OSS connectivity down - both x.25 downOne X.25 downNSEI DownBVCI DownZero Voice calls on particular CellUnit re-startSIGNALLING LINK OVERLOADSIGNALLING LINK DOWNSIGNALLING LINK ACTIVATION OR RESTORATION FAILURESIGNALLING LINK SET DOWNGPRS/EDGE LOAD IS VERY HIGH IN PCU OF PSEBTS AND TC UNSYNCHRONIZATION CLEAR CALLS ON ABIS INTERFACEWDU FAULTYSTMU FAULTYMCMU RESTARTBCSU RESTARTBCSU SWITCHOVER

Iu-CS link downBoth Iu-PS links downOne Iu-PS link downBASE STATION FAULTYBASE STATION OPERATION DEGRADEDBASE STATION NOTIFICATIONCELL FAULTYCELL OPERATION DEGRADEDCELL NOTIFICATIONBASE STATION LICENCE NOTIFICATIONBASE STATION TRANSMISSION ALARMBEATING WCDMA BTS ALARMFAILURE IN WCDMA WBTS O&M CONNECTIONRNW O&M SCENARIO FAILUREWCDMA CELL OUT OF USEHSDPA CONFIGURATION FAILEDWCDMA BTS DEDICATED MEASUREMENT FAILUREHSUPA FAILURE IN WCELWCDMA 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

Some Subscribers not able to latch on TATA network from specific handsets

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

SYNCHRONISATION IS MISSING All External Q1 device fail to respond

Rx levels differ too much between main and diversity antennas, RSSI detected Rx signal difference exceeding threshold

S. No. Problem Alarm Description / Comments Catergory

1 2175

Serv

ice

affec

ting

non-

Serv

ice

affec

ting

2 One X.25 down 2175

3 NSEI Down 3315

Serv

ice

affec

ting

4 BVCI Down

Serv

ice

affec

ting

Alarm No. at BSC

OSS connectivity down - both x.25

downOSI CLNS LINKAGE NOT

AVAILABLE

OSI CLNS LINKAGE NOT AVAILABLE

Non-Service

affecting

ALL NETWORK SERVICE ENTITIES UNAVAILABLE

4 BVCI Down

Serv

ice

affec

ting

5 7738

7 26

8 1072

9 2072

10 2070 LINK SET UNAVAILABLE

11 3415

12 2993

Serv

ice

affec

ting

Zero Voice calls on particular Cell

BTS WITH NO TRANSACTIONS

SIGNALLING LINK OVERLOAD

SIGNALLING LINK LOAD OVER THRESHOLD

SIGNALLING LINK DOWN

SIGNALLING LINK OUT OF SERVICE

SIGNALLING LINK

ACTIVATION OR RESTORATION

FAILURE

FAILURE IN SIGNALLING LINK ACTIVATION OR

RESTORATION

SIGNALLING LINK SET DOWN

Service affecting

GPRS/EDGE LOAD IS VERY

HIGH IN PCU OF PSE

GPRS/EDGE LOAD IS VERY HIGH IN PCU OF

PSE

Non-Service

affecting

BTS AND TC UNSYNCHRONIZ

ATION CLEAR CALLS ON ABIS

INTERFACE

BTS AND TC UNSYNCHRONIZATION CLEAR CALLS ON ABIS

INTERFACE

13 DISK FAILURE 2860 DISK FAILURE

14 WDU FAULTY 2861, 2692

non-

Serv

ice

affec

ting

15 STMU FAULTY 2794Se

rvic

e Th

reat

enin

g

NO ACCESS TO DISK ,INCORRECT WORKING STATE

HW BLOCK FAILURE IN PLUG-IN UNIT

16 MCMU RESTART

Serv

ice

Thre

aten

ing

17 BCSU RESTART

Serv

ice

affec

ting

26920690,1001

INCORRECT WORKING STATEworking State Changed , Unit restarted

269206901001

INCORRECT WORKING STATEworking State Changed , Unit restarted

18

Serv

ice

Thre

aten

ing

19 2,641

Serv

ice

Thre

aten

ing

BCSU SWITCHOVER

269206901001

INCORRECT WORKING STATEworking State ChangedUnit Restarted

Loss of Synchronization in BSC

Failure in Synchronization Signal

Affect / Steps to be follow for troubleshoot

1. Check the signalling links states at MSS end

3. Send local engineer at BSC site

1. Check the signalling links states at MSS end

5. If media ok, Send local engineer at BSC site

Data traffic affect, down

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

Data traffic affect, down

2. If signalling links / link set down means BSC down(Alarm-Link Set Unavailable)

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.

2. If Signalling links found ok, Check the voice & data traffic at MSS & PACO end (normal or any degradation)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.

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 .

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

5. During MW Hrs diagnose that BCSU. 1. Diagnose ok - make BCSU in WO state and observe the alarm & UP/DL tbf. 2 Diagnose not ok - change the PCU and again run diagnosis.

1. GENA toggle & check status.

2. Check PCU-BCSU combination:

(c) BCSU switchover.

(d) PAPU re-set / switchover .Check hardware, cabling & commissioning

Check UP/DL quality, path imbalance/VSWR/RSSI

Check the Transmission path

Check the Transmission path

Impact: Call drop, Quality degradation, Call muting

(a) In case a particular PCU-BCSU combination: shift the traffic to other PCU & Switchover BCSU in MW and run diagnosis. (b) PCU-BCSU combination random on many BCSU-PCU combinations - Traffic prevent - unprevent from both end and PSE re-set.

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.

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.

If there are other path available, signalling links path re-route with discussion with planning teamAll signalling links in the signalling link set are unavailable. 100% traffic of that link set down.Check alarm: 2064 - ROUTE SET UNAVAILABLE. If this alarm present means no route is availableCheck for the end to end connectivity for the Aters carrying signalling (MSC,TXN and BSC), transmission alarms.If found OK then send the engineers at the BSC for further troubleshooting.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.

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 slot may be locked till the time , replacement is made. the site should also be checked for other alarms and reqd action should be taken .

The system has detected a serious error 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 diagnosis fail then change the hard disk as per standard procedure for replacing the WDUImpact: No hard disk Redundancy, Measurements might be affected.

) and DCAR card .perform the OMU restart and check .if problem reolved, perform the diagonisis of WDU and check the all database is updated or not .3. if problem does not resolved , swap the position of WDUs in DCAR card and check if problem shifted to another hard dsik it means it is hard disk issue ,if problem is with same slot it means it is a problem of DCAR card. (During this troubleshooting SOMAFI

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 States7. 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 Cateagory Impact

1 Iu-CS link down 2070 SA RNC Total Outage

2 2070 SA RNC data traffic outage

3 2070 NSA No Data traffic outage

4

7650 SA Transmission to NodeB will be affected

5 7651

SD

SA NBAP/AAL2 signalling link failure

SA

Alarm No. at RNC

Alarm Description /

Comments

LINK SET UNAVAILABLE

Both Iu-PS links down


One Iu-PS link down


BASE STATION FAULTY

No connection to Flexi transport submodule

BASE STATION OPERATION DEGRADED

BTS reference clock missing

Service will be affected based on the degradtion threshold level

BTS RNC/I-HSPA interface signalling link failure

System module failure

NodeB Capacity may be reduced/NodeB totally may not be opreational

6 7652

SA

NSA BTS time will not be correct

NSA

Fan failure NSA Temparature will be increased

SA

SA

7 CELL FAULTY 7653 SA

VSWR alarm

8 7654

SA Sectors Operation will be degraded

BASE STATION NOTIFICATION

BTS requires restart because license status has changed

Mentioned licence feature will not work

BTS time not corrected

Difference between BTS master clock and reference frequency

BTS frequecy deviates from IuB referecne

Heating element not working

Heating from the heating element isnot available. The module temperaturemay not reach the working level ormay reach it very slowly

Temperature alarm

Depending on severity BTS Capacity may be reduced/BTS totally may not be opreational

Failure in optical RP3 interface


Incompatible SW version detected


RF module failure

Sectors will be affected depends on severity


CELL OPERATION DEGRADED

RF module failure

8 7654NSA Sectors Operation will be degraded

97655 SA Cell will be down

10 7661

NSA

SA Sector down

SA SDPA Traffic will affect

CELL OPERATION DEGRADED Rx signal level

failure

CELL NOTIFICATION

Radio resources switched off

BASE STATION LICENCE

NOTIFICATION

HW capacity too low for feature 308, Licence Based BTS channel c

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

Licence missing 0000000306, HSDPA 16QAM SW Licence Support

Licence missing 0000000307, HSDPA Proportional Fair Resource Pac

NSA Degradation

Licence missing 0000000649, Shared HSDPA Scheduler for Baseband

NSA Degradation

10 7661

SA

11 7665 SA

Service Degraded

Cell Down

127740 (blank) NSA Repeatation of any alarm causes

13

7750 (blank) NSA

14 7761 SA

Cell Down

Cell Down

Cell Down

Cell Down

15 7771 SA

Sector down

Sector down

BASE STATION LICENCE

NOTIFICATION

Verification of target ID failed 3 times.

Degradation of system module

BASE STATION TRANSMISSION

ALARM

License missing for feature Additional 2 E1, T1, JT1 interface o

License missing for feature UBR+.

BEATING WCDMA BTS ALARM

FAILURE IN WCDMA WBTS O&M CONNECTION

BTS Cannot be logined remotly & Measurements will not be updated

RNW O&M SCENARIO FAILURE

AAL2 path unblock not accomplished

BCCH information updating has failed

Common channel deletion has failed

NBAP interface type unknown failure

WCDMA CELL OUT OF USE

Block resource request, normal priority

Common measurement failure scenario

15 7771 SA Sector down

Sector down

Sector down

When Site Down Or Sector Down

16 7772 SD

Service Degraded

Service Degraded

17

7778 SA DCN state - Disable Or Cell Faulty

18 7780 SA

197786 (blank) SA WBTS will be down

WCDMA CELL OUT OF USE

NBAP link failure

Resource status indication, cell disabled

WCEL state not WO

WCEL state not WO after setup

HSDPA CONFIGURATION FAILED

RNC internal error

WBTS rejects the configuration

WCDMA BTS DEDICATED MEASUREMENT FAILURE

HSUPA FAILURE IN WCEL

A unit (or units),taking care of HSUPA traffic in the WCEL can be faulty



WCDMA BASE STATION OUT OF USE


Possible Causes Solution

Site Clock E1 having errors / AIS

Transmission break or fluctuations

Abnormal functioning of FSM Reset FSM/Replace FSM

Affects: Communication with MSS down: Total outage1. Check the unit status for any failure and check the current and history alarms2. Ping & trace MSS control plane and user plane IP3. Check Association set and association links status and end IP4. Check connectivity B/W end trace IP to MSS.Affects: Communication with Both SGSN down: Total data Traffic outage1. Check the unit status for any failure and check the current and history alarms2. Ping & trace SGSN control plane and user plane IP3. Check Association set and association links status and end IP4. Check connectivity B/W end trace IP to MSS.Affects: Communication with one SGSN down: data working fine with connected SGSN, no outage happened in this case,only redundant path down.1. Check the unit status for any failure and check the current and history alarms2. Ping & trace SGSN control plane and user plane IP3. Check Association set and association links status and end IP4. Check connectivity B/W end trace IP to MSS.

Malfunction of Transport Module in System Module

Reset System Module/Replace Transport Module in System Module

Clock E1 Interface needs to be check & Check the SYNC of TXN side

Check transmission configurations and paths

Restart BTS.

NTP Server IP mismatch

DAC Valure variations Set DAC value to standard value

H/W Faulty

Check the FAN units in FSM/FRGP

SW Mismatch of BTS

Abnormal functioning of FRGP

High VSWR

Abnormal functioning of FRGP

After licence installation BTS not given restart

Check NTP server IP it should be same as RNC OMS IP

Check working status of Fans or replcae FAN units in FSM

The heater control connection of the FSM is faulty, there is no heater or the heater is faulty.

Check whether the heating element exists at all./ Check the heater control connection and that the 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.

Abnormal/ failure in optical cable between FSM & FRGP

Check the Optical cable connecton between FSM & FRGP/Reset FSM/Replace cable.

Recomission BTS with Correct SW version

Reset FRGP/FSM/Check interface cables/Replace FRGP

Check the VSWR, should be less than 1.3

Reset FRGP/FSM/Check interface cables/Replace FRGP

Check the VSWR & Antenna cables

HSDPA License Missing Or Cell Down Call to GNSC CM get it clear

The RX signal level is less than -112dBm or the difference between the maximum and minimum power 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 60W power for sector.

Login to nodeB and change parameters of sector power to 20W

License missing License missing

License missing License missing

This basic license missing

HSDPA License Missing

Repeatation of any alarm causes

Cell Down Need to check WCELL/WBTS alarm

Cell Down

Hanged/config issue/comm issue Hanged/config issue/comm issue

GNSC has to load this basic license from Netact

GNSC has to load this basic license from Netact

Cancels once causing Alarm is cleared

DCN Configuration mismimatch in NodeB/RNC/tellabs

To be checked DCN Configrations at RNC/NodeB/Tellabs

CoCo/ATM Configuration Mismatches between NodeB/RNC/Tellabs

To be checked CoCo/ATM Configuration Mismatches between NodeB/RNC/Tellabs







Need to check WCELL/WBTS alarm

Cell Down

Cell Down

Cell Down

Cell Down

Cell Down

Cell Down

Cell Down

CNBAP/BRM Break




Once Node-b is up, alarm will clear

Cell Down / Interface Down Or H/W configuration In Node-B

Node-B Lock & Unlock Or Restart Node-B / Cross check & Rectify Node-B H/W Configuration --All This action based on Sublimentory information of Alarm

Cell Down / Interface Down Or H/W configuration In Node-B

Node-B Lock & Unlock Or Restart Node-B / Cross check Node-B H/W Configuration --All This action based on supplementary Alarm Info.

DCN connected E1 Interface needs to be cross check

DCN Interface / Lock all the cells under the BCF and delete & Re-create COCO configuration and unlock all the cells / If required Site reset has to be given ( Anlaysis based on supplementary info)




Check the transmission path & Configuration between NodeB to RNC

S. No. Problem Alarm No. at BSC Alarm Description / Comments Catergory

1 7665 BFD down

2 3G Sites down Base Station out use

3 Fault rate monitoring & PCM failures

4 Fault rate monitoring & PCM failures

5 M/W Link Problem

Serv

ice

Thre

atni

ng

BFD Down in AXC (Tellabs)

Service Degradation

Service affecting

2G or 3G sites down (Mw ring collapsed)

Service affecting

2G/3G multiple sites down

Service affecting

No Alarm observed in the link, except RSL dip at one end.

At one end, RSL of the link is OK, on other end it dips to -90dBm.

No typical alarm observed in the link.


Deimplement trails for culprits ISA & raplace ISA ASAP.

Sites need to be indentified on particular MUX

Core mux malfunctioning at BSC/RNC location

2G & 3G site database shared with all CTLs

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.

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.

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 BTS Type

1 Flexi/MR 7787

2

3 Flexi 7607

4 Flexi 7607

5 Flexi/MR 7607

Alarm No. at BSC

SYNCHRONISATION IS MISSING All External Q1 device fail to respond

a)Some Subscribers were not able to latch on TATA network from specific handsets.While Same Handsets were running fine with IDEA or any other operator from a perticular site (N_UW_NRA_001,Muzzafarnagar)

Flexi Edge BTS

Rx levels differ too much between main and diversity antennas, RSSI detected Rx signal difference exceeding threshold

EXxx TRX module cooling fan s report no rotation,ESMA System module cooling fan s report no rotation

a)ERxx DDU module has detected VSWR above minor limit at anten

Alarm Description / Comments Catergory

Service affecting

Service affecting

service affecting

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,Muzzafarnagar) there are two NSN equipments serving for IDEA/TATA.No alarm was found on problematic site.

Rx levels differ too much between main and diversity antennas,RSSI Value is high than 10.

Service Degrading

TRX cooling fan not rotate ESMA cooling Fan not rotate

Service Degrading

VSWR limit is high than 1.5 for Minor alarm and >2.7 for major alarm


BCF Alarm Guide

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 enabled4.Check ESLA cable connectivity between ESMA to LMU ,if found any abnormality then Replace ESLA cable 5.Check LMU unit Activities steps as follow:-1.Firstly we Check Infra condition of the site2.Check the BTS configuration of the site ,properly check weather there is any alarm in site,But no service affecting/Service degrading alarm found3.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 check7.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 found10.Rehome the site BCF-22/ Muzaffarnagar BSC to Meerut -1 BSC with different LAC and CI and check.11.Finally problem resolved after replacing the ESMA card of IDEA site serving at same location.Conclusion - There was some Sync problem at Idea Site of that perticular loaction 1.Check the RSSI measurements with BTS Manager.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.5.Check that the RX-DL parameter at the BSC is set to a reasonable value in order to prevent unnecessary alarms.1.90% there is a chance of Over heating or Room tempurature high inside 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 7.If problem is not resolved with all above steps then Replace TRX/ESMA

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 4.Check RSSI comparision value between Main and diversity of that particular sector

D:\userdata\alekar\Desktop\BSS Fault

BSS Troubleshooting Guide (2)

Documents

userdataalekar

osi clns linkage

user association

vdu lanu

send local

mw ring collapsed

link set unavailable

2g3g multiple