Basic command for 2G BTS1.
For UP/DOWN Status-
RLCRP: CELL=ALL; ( if shows 0 for all value site/sector will be down)
2. If site down check the condition of PCM –if it is ABL (not working) verify theloop test to
identify the fault and if PCM is working check the alarm on BTS.
3. For finding the PCM use command-
RXTCP: MOTY=RXOTG, CELL=cell; (cell id with sector i.eBST001A)It gives TG VAULE
RXAPP: MO=RXOTG-tg $; (tg$ is TG VALUE)
It gives device no. use last device RADEP: DEV=dev$; (dev$ is device value i.eRBLT-2719)
It gives SNT value NTCOP: SNT=snt$;
Find the device no that is used in dev$ and corresponding vaule of DIP
4. Check the status of PCM DTSTP: DIP=dip$; (dip$ is DIP VALUE i.e 83RBLT)
DTQDP: DIP=dip$; & DTQUP: DIP=dip$; FOR finding error on PCM
Check the value of es, ses uas & SLIP ,these value must be 0 or constant)
5. If PCM condition found working then BLOCK /DEBLOCK to get managed object in working
condition use command
RXBLI:MO=mo$,subord,force;
RXESE:MO=mo$,subord;
RXESI:MO=mo$,subord;
RXBLE:MO=mo$,subord;
(mo$ - RXOTG-tg$, RXOCF-tg$, RXOCON -tg$ ,RXOIS-tg$,RXOTRX-tg$-teivalue ,RXOTX-
tg$- tei value,RXORX-tg$- tei value,RXOTS-tg$-tei value-timeslot no)
6. For finding the faulty managed object use command
RXASP: MO=RXOTG- tg$;
This alarm list contains various alarms like BTS INT UNAFFECTED, BTS INTAFFECTED,
PERMANENT FAULT, some alarms can be removed by usingBLOCK/DEBLOCK commands.
7. For finding fault code on particular managed object (mo) use
RXMFP: MO=mo$;
This command shows fault code class and code some description is bellow
IF mo$ is RXOCF then FAULT CODE IS
2A-33 RX diversity lost
2A-8 VSWR limits exceeded
2A-57 RX PATH IMBLANCE (VSWR)
2A-39 RX cable disconnected (Related faults: RXORX 1B:9 - RX cabledisconnected)
2A:7 RXDA amplifier current faults (CDU FAULTY Need replacement)
2A-21 internal power capacity reduced (PSU unit faulty or power off)
2A-41 lost communication to TRU
2A:23 Climate capacities reduced (Check fans and the Fan Control Unit)
2A:9 Power limits exceeded (Related faults: RXOTX 1B:2 TRU faulty needreplacement)
If mo$ is RXOTRX then fault code is
1A-13 TX saturation (TRU FAULTY Need replacement)
2A-12 TX output power limits exceeded (Related faults: TX 1B:13)block/deblock unit if not
work Change TRU.
2A-13 TX saturation (Related faults: TX 1B:14 - TX saturation)block/deblock unit if not work
Change TRU.
2A:25 TX max power restricted block /deblock unit if not work Change TRU.
2A:43 internal configuration fail block /deblock unit if not work Change TRU.
2A:42 Hardware IDB inconsistent check combiner chip & then IDBAny alarm found other than
mentioned above on any manage object then pleaseconsult with MSC Gorakhpur
8. FOR replacement of TRU
First get local mode on TRU by pressing Local /Remote button on TRU
2nd power off the TRU
3RD with the help of T10 Screw driver open the 2 pair screw on upper/lowerend of unit
4th replace the faulty unit with new one
5th power on and wait until Local Lamp get constant glow
6th again get remote status by pressing Local /Remote button on TRU
Wait for operation condition by 5minute if not operational block/deblock from BSC if not work
contact with MSC Gorakhpur
Same processors adopt for CDU replacement (except Local/remote)Caution must be taken for
wiring of units
Tools (basic) used for hardware replacement are-32” wrench8/9 wrenchNoze pliersT10T8
For analysis of TCH BLOCKING
1. Find that site working in full configuration by using command RXCDP: MO=RXOTG-tg$;
(ALL mo must be configured)
If any BLOCKED found then use command
RXASP: MO=RXOTG-tg$; (to find the all alarm and reason of block) IF LOCAL MODE found
than try to make REMOTE otherwise Check the fault code by command RXMFP:MO=mo$; (to
find the exact fault code to make decision that hardware if faulty or not if hardware is faulty and
need replacement then book the fault to ericsson and if the hardware is not faulty the
BLOCK/DEBLOCK to make unit operational )
If any mo not block then check the half rate is on or off
For checking half rate use command RLDHP: CELL=cell; (DHA=ON)If DHA not ON use
command to on it RLDHC: CELL=cell, DHA=ON; If traffic is more than for witch site is
configured (as erlang B table ) then increase the value of half rate by using command
RLDHC: CELL=cell, DTHAMR=100, DTHNAMR=100; Erlang B table TRU (Per sector)
Traffic that supported on full rate1 2.2E2 8.0E3 14.5E4 21.4E5 28.5E6 35.8E7 43.1E8 50.5E
If none of the above case so new BTS is required to release congestion
For analysis of TCH DROP/CALL DROP
1. find alarm of RXOCF i.e VSWR or RX diversity lost if present the get rectify it
2. find alarm of TRU if any alarm the get rectified3. use command
RLCRP:CELL=cell;
and in output see the ICM band must be 1 to 3 if ICM band is 4-5 then correspond TRU is faulty
get replacement (for finding the corresponding TRU use BPC no. in RLCRP: CELL=cell; and
RXCDP: MO=RXOTG-tg$;
4. check handover report form Network quality report that is handover is properly work
5. define handover if not present in neighbor list using the command
RLNRP: CELL=cell, CELLR=all; ( for neighbor list)
RLNRI: CELL=cell, CELLR=cellr; (for cellr add in neighbor list)
