Basic command for 2G BTS 1. For UP/DOWN StatusRLCRP: 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 the loop test to identify the fault and if PCM is working check the alarm on BTS. 3. For finding the PCM use commandRXTCP: MOTY=RXOTG, CELL=cell; BST001A)
(cell id with sector i.e
It gives TG VAULE RXAPP: MO=RXOTG-tg $;
(tg$ is TG VALUE)
It gives device no. use last device RADEP: DEV=dev$; RBLT-2719)
(dev$ is device value i.e
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$,RXOTRX-tg$-tei value ,RXOTX-tg$- tei value,RXORX-tg$- tei value,RXOTS-tg$-tei value-time slot no) Page 1 of 4
6. For finding the faulty managed object use command RXASP: MO=RXOTG- tg$; This alarm list contains various alarms like BTS INT UNAFFECTED, BTS INT AFFECTED, PERMANENT FAULT, some alarms can be removed by using BLOCK/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 cable disconnected) 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 need replacement) 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 IDB Any alarm found other than mentioned above on any manage object then please consult 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/lower end 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 Page 2 of 4
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 are32” wrench 8/9 wrench Noze pliers T10 T8
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$; (to find the exact fault code to make decision that hardware if faulty or not if hardware is faulty and need replacement then book the fault to ericsson and if the hardware is not faulty the BLOCK/DEBLOCK to make unit operational ) If any mo not block then check the half rate is on or off For checking half rate use command RLDHP: CELL=cell; (DHA=ON) If DHA not ON use command to on it RLDHC: CELL=cell, DHA=ON; If traffic is more than for witch site is configured (as erlang B table ) then increase the value of half rate by using command RLDHC: CELL=cell, DTHAMR=100, DTHNAMR=100; Erlang B table TRU (Per sector) Traffic that supported on full rate 1 2.2E 2 8.0E 3 14.5E 4 21.4E 5 28.5E 6 35.8E 7 43.1E 8 50.5E If none of the above case so new BTS is required to release congestion Page 3 of 4
For analysis of TCH DROP/CALL DROP 1. find alarm of RXOCF i.e VSWR or RX diversity lost if present the get rectify it 2. find alarm of TRU if any alarm the get rectified 3. use command RLCRP:CELL=cell; and in output see the ICM band must be 1 to 3 if ICM band is 4-5 then correspond TRU is faulty get replacement (for finding the corresponding TRU use BPC no. in RLCRP: CELL=cell; and RXCDP: MO=RXOTG-tg$) 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)
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