- This topic has 16 replies, 1 voice, and was last updated 15 years, 11 months ago by Nokia Siemens Trainer.
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27th October 2006 at 23:14 #45970DAC_DrifterGuest
Has Nokia ever come up with a definite solution for the following alarm condition?
“Difference between PCM and base station frequency reference”
Have replaced BOIA, FXC, smjk, T1 extention, Abis cable.
Running out of idea’s here.
TIA
2nd November 2006 at 22:19 #45971DAC_DrifterGuestHas Nokia ever come up with a definite solution for the following alarm condition?
“Difference between PCM and base station frequency reference”
Have replaced BOIA, FXC, smjk, T1 extention, Abis cable.
Running out of idea’s here.
TIA
6th November 2006 at 14:03 #45972PatrickGuestI have a similary problem.
BCF-045 EQUIPM 2006-10-31 23:49:17.38
** ALARM
(12739) 7601 BCF OPERATION DEGRADED
Difference between PCM and base station frequency reference.signal quality:
ZYMO:ET,33:;
Sometimes, i have EFS not at 100%I think that you must check your PCM like me.
Your PCM is bad quality but not enough to broke the link.NED:
7601 BCF OPERATION DEGRADED
Meaning
A major fault (or faults) has occurred in the base station.Check the fault reason from the supplementary text field of the alarm.
Supplementary information fields
1-6 XX XX XX XX XX XX
1 2 3 4 5 61) rack (cabinet) number
4) type of unit
2) shelf number
5) unit number
3) slot
6) subunit numberFault reason: Difference between PCM and base station frequency reference.
Instruction:
1. Check the cabling.
2. If the cabling is OK, replace the BOI.12th November 2006 at 07:57 #45973zatulikGuestYou must following than operations:
1) Restart OMU channel of BCF ( ZEFR:XX:OMU; (where XX- number of BCF))2) IF the alarm become again please watch synchronization on bcf( use Nokia UltraSiteHub Manager)
3)If this operation not succeed please check the cabling and than replace the BOI
REMARK: IF BCF IT’S NEW PLEASE WAIT 1 DAY.
14th November 2006 at 14:21 #45974DAC_DrifterGuestFirst, thank you for your reply! What synchronization information should I be looking for in BTS Hub Manager? Is it the synchronization cable between cabinets that I should replace? This is a single frame 4+4+4 850/1900 cabinet so it does not have a cable.
15th November 2006 at 13:08 #45975PatrickGuestSynchronization:
PRIORITY ONE= Your PCM (2Mbit) FXC E1/T1)PRIORITY TWO= internal timing
what cable do you speak????
BTS take her synchronization on her PCM link.
remember PCM quality on ET of BSC is:
ZYMO:ET,xx;
All in 100%, local and remote end EFS.16th November 2006 at 13:45 #45976zatulikGuestZYMO:ET,xx;- don’t always show errors( it’s experience base). Cable between FXC E1/T1 and cross base station.He’s name PCMCI
If this operation not succeed please – replace the BOI
question:How transmission comes on Base station?(USING OPTICAL CABLE OR DMR)
16th November 2006 at 14:19 #45977patrickGuestzatulik – 16 Nov 2006
ZYMO:ET,xx;- don’t always show errors( it’s experience base).=> BECAUSE on ATER or GB, there is not error compter
ZYMO
This compter is very reliable for ABIS link.16th November 2006 at 14:32 #45978DAC_DrifterGuestIs there a ZYMO commmand that is similar to the ZEOH:,:BCF=XX; that will show the history of the ET PCM?
Transmission is provided by fiber but is extended into site on copper extension CAT-5 cable.
Syncronization settings:
1) Rx Clock IF 1
2) Internal TimingZYMO indicates that all are 100%.
Have already replaced BOIA.
Any idea’s?
17th November 2006 at 13:31 #45979patrickGuestZYMO => measurement of your PCM link quality. (ET of BSC)
ZEOH => history of alarm of your BTS.
24th February 2007 at 01:29 #45980DAC_DrifterGuestCould the T1 Rx Signal be causing this problem?
This is what I observed at the smart jack.
Voltage p-p and Rx signal fluctuating from:
2.5 V p-p to 4.49 V p-p
and signal
-14.5 dBdbx to -2.5 dBdbx
Will the telco provider fix this problem or is this considered acceptable.
As always, thanks for all of the help!
24th February 2007 at 01:31 #45981DAC_DrifterGuestCorrection:
-14.5 dBdsx to -2.5 dBdsx
24th February 2007 at 17:46 #45982patrickGuestWhat do you use? FXC E1/T1?
25th February 2007 at 01:46 #45983DAC_DrifterGuestT1 B8ZS ESF
“ALARM 7601 Difference between PCM and base station frequency reference”
26th February 2007 at 09:56 #45984patrickGuestI have the same problem but with FXC E1/T1
I think, it is a bad quality of signal but i don’t know why and where.
It is strange because everything is OK:
-BTS OK
-13 mhz OK
-ZYMO:ET OKIf you find the solution, tell me it.
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