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BTS O&M LINK FAILURE

Viewing 7 posts - 1 through 7 (of 7 total)
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  • #68417 Reply
    alonewolves
    Guest

    Hello to Nokia BTS Experts.

    after severe R/L fluctuation bcs of rainy or windy whether, a few nokia ultrasite BTS OMU signaling and TRX LAPD signaling links remains blockage,

    restoration of these signalink links by MML commands fails,

    only way to get the BTS worked is locally Hardreset.

    sometimes applying loopback the PCM towards to BTS, may solve the problem.

    Can you make some comments on this issue ,

    Regards.

    #68418 Reply
    Erwin Cahyadi
    Guest

    Hi,
    I’m experienced this too, and in my case loop-unloop transmission equiment solved the problem.

    Weather that are not good and degraded performance of transmission link might be the root cause. Fix transmission line first by troubleshooting alarm or quality test.

    #68419 Reply
    alonewolves
    Guest

    Thanks Erwin for the reply,

    let me make another comment on this issue,

    this kind of problem happens on Nokia BTSs, although huawei and motorola bts don’t suffer from the same issue,

    whenever Transmission quality reaches good level, bts should initialize itself automatically and stand-up
    everytime loop-unloop solution take times in big networks.

    i suppose that problem is Transmission card which is located in BTS.

    Tomorrow i am going to ask my colleague who they had used nokia bts long time about how they overcome this problem.

    if i got useful info, i would share it with you.

    BR.

    #68420 Reply
    alonewolves
    Guest

    Hi Nokia Experts,

    Pls contribute to this issue with your precious comments.

    Regards

    #68421 Reply
    Victor
    Guest

    Sometimes you need to check the internal clock (the setting it is 2048) if it is not the correct parameter the BOIA will be blocked.

    Also this clock is used incas of lost of frames but after rain or wind it could change a lot

    I hope the answer can help you.

    #68422 Reply
    alonewolves
    Guest

    Victor,

    i have checked clock values for 10 sites which they are located in 5 different BSCs

    values changes from 1742 to 2578.
    none of the bts has exact clock value of 2048.

    as i understand your statment when the clock value is differs from 2048 boi may blocked itself ? so this reason it is needed to check clock values sometimes and manually adjust the clock value ?

    by the time we use Rx clock only for synchronization, (no internal timing )

    hearing from you soon..
    BR

    #68423 Reply
    alonewolves
    Guest

    Nokia BSC’s OMU suffer from blokage issue too,

    Loop-unloop solves the problem most of time

    last time we could not reach to the BSC bcs OMU link was out of service,

    Loop-unloop given to the BSC’s omu link during 10 munites

    then access to the BSC was OK.
    What is the wrong with Nokia systems ?

Viewing 7 posts - 1 through 7 (of 7 total)
Reply To: BTS O&M LINK FAILURE
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