ALU 2G BTS dropping

[evagtf@yahoo.fr]

Dear Experts
Hi,
I'm facing ALU BTS 1800 going down and sometimes up by it self
Please note there is no Power or Transmission problem,
Abis,OML and O&M remain up at the Suma board, Please assist to
locate the root cause and explain more about DSP alarm sent from TREs.

Regards

[danikd]

Interesting abnormal behavior of Alcatel GSM base station was observed. Sometimes, voluntary, without any reason or after BTS reset, some TRXs start malfunctioning in other words - generates excessive bad DL RxQuality (between rxqual 5-7 more than 60%).
The Alcatel network runs under B10 release.
Massive replacement of TRXs (~150) can not solve all issues. Observed excessive DL bad RxQuality may voluntary appear and voluntary disappear. Again it is DOWNLINK!!!!! No external interference in the network recognized. No frequency reuse issues - since no frequency plan changes.
Simple BTS reset not solving a problem, TRX replacement solving problem only in 50-60% of cases.

Does anyone experience similar problem? and what solution? Alcatel support still did not provide any answer for already 3 months.
The network performance affected significantly, Drops, Bad voice quality

[evagtf@yahoo.fr]

Hi,
Have you tried to replace Internal/External Bus cable(remote inventory cable), and or OUTC board?.

Regards

[evagtf@yahoo.fr]

Hi Danikd
I solved my indoor Alu Indoor BTS dropping issue after one TRX(that reported DSP alarm) shutdwn, since no dropping more than a week ago.
now I keep focus on it, and then i'll swap the affected TRX.

Regards.

Interesting abnormal behavior of Alcatel GSM base station was observed. Sometimes, voluntary, without any reason or after BTS reset, some TRXs start malfunctioning in other words - generates excessive bad DL RxQuality (between rxqual 5-7 more than 60%).
The Alcatel network runs under B10 release.
Massive replacement of TRXs (~150) can not solve all issues. Observed excessive DL bad RxQuality may voluntary appear and voluntary disappear. Again it is DOWNLINK!!!!! No external interference in the network recognized. No frequency reuse issues - since no frequency plan changes.
Simple BTS reset not solving a problem, TRX replacement solving problem only in 50-60% of cases.

Does anyone experience similar problem? and what solution? Alcatel support still did not provide any answer for already 3 months.
The network performance affected significantly, Drops, Bad voice quality

[Processor]

ALU Guys,

What would be the effect of the following components on KPIs;

1) Faulty SUMA
2) Faulty Combiner
3) Faulty TCUC
4) Faulty CPRC

Kindly include other components on the BTS or BSC that may affect KPIs

[pioneerelex]

ALU Guys,

What would be the effect of the following components on KPIs;

1) Faulty SUMA
2) Faulty Combiner
3) Faulty TCUC
4) Faulty CPRC

Kindly include other components on the BTS or BSC that may affect KPIs

1) Faulty SUMA:

Drastically degrade the handover efficiency for the whole site (site's three cells are affected).

2) Faulty Combiner:

The TRXs efficiency goes down affecting the most of major KPIs CDR, HO efficiency rate, SDCCH Drop, etc..

[evagtf@yahoo.fr]

Hi ALU Guys
Faulty TCUC :The OML is affected and the BTS loses communication with the BSC
Faulty CPRC: You need to specify wich kind of CPRC(OSI or System)
Faulty CPRC OSI: There is X25 link lost from OMC/NMC and some times N7 signalling link affected
Faulty CPRC System: BSC software affected, BSC is down and all the sites controlled by the BSC.


Regards

Kindly include other components on the BTS or BSC that may affect KPIs[/QUOTE]

[Processor]

what components impact on Preparation failures on BSS?

[zloy_qwer]

Dear, please try to define if faulty TRXes have something common?
1) common area/cluster
2) common day of TRX production, cargo batch.
3) common BSC/CPU/board/port
4) common antenna type?
5) common transmission type.
6) common transmission node.
7) common BTS software version?
8) common time of faulty.
9) common cklock sourse.

After you find something common/ you can do drill insinde corrupted object.