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BTS and TC unsync in Nokia BSC 3i

  • This topic has 21 replies, 1 voice, and was last updated 7 years ago by S K SAURABH.
Viewing 15 posts - 1 through 15 (of 22 total)
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  • #41709 Reply
    govindaraj
    Guest

    Hi all,

    In nokia bsc 3i (Dx200) we are getting severe call drop . in ZAHO command i am gettting this type of problem. Even chnage of trx, BB2F ,Recreate the pariticular bts every thing done.but stiil no improvement.

    the alarm is

    2993 BTS AND TC UNSYNCHRONIZATION CLEAR CALLS ON ABIS INTERFACE

    Any nokia experts pls help me .

    #41710 Reply
    Patrick
    Guest

    When ATER or ABIS cut off, you can have this alarm.

    extract of NED:
    Meaning
    Calls have been cleared three successive times on the same Abis interface
    channel due to BTS and transcoder unsynchronisation.
    Supplementary information fields
    1 identifier of the base station

    2 identifier of the TRX

    3 identifier of the radio time slot

    4 number of external PCM circuit

    5 time slot of external PCM circuit

    6 sub-time-slot of external PCM circuit
    Instructions
    Lock the channel in question with the MML command ERS.

    Check the transmission between the BTS and the BSC (and transcoder).

    Check other active alarms concerning the BTS and the BSC
    (and transcoder) transmission or transcoder plug-in units.

    Correct the faults causing the alarms.

    When the above-mentioned transmission alarms have been cancelled
    or when transmission is working again, unlock the channel in
    question with the MML command ERS.

    #41711 Reply
    selva
    Guest

    Hi,

    if you block the particular time slot it will be solved.

    #41712 Reply
    alexander
    Guest

    or check your transmission, may be it’s not ok, may be some timeslots are overlapping

    alex
    http://www.dx200.biz

    #41713 Reply
    govindaraj
    Guest

    Hi all,

    I am Govindaraj . For the above said problem was cleared by setting the BTS clock (DAC value) with normal value like 2051.

    But i don’t know why the BTS(Ultra) clock value is drastically decreasing. ?????
    if any one have same type of problem and if u have a solution pls share with me.

    #41714 Reply
    SurvivorNBS
    Guest

    Try to replace the BOIx

    #41715 Reply
    alexander
    Guest

    govindaraj, did you solve the 2993 alarm problem?

    alex
    http://www.dx200.biz

    #41716 Reply
    govindaraj
    Guest

    Hi Alex and SurvivorNBS,

    Thanks for u r reply.

    To Alex : Yes alex we had solved the problem by recommissioning the site than it was cleared.our nokia local support engineer told thatwas problem due to clock.

    To SurvivorNBS : Actually not only in that site every sites we are facing the clock value is reducing .

    So that way i send this to all of u.

    Thanks ,

    Govindaraj

    #41717 Reply
    hoistler45
    Guest

    Hi govindaraj,

    After recommissioning the affected sites?where there signs of the clock value decreasing again after a few days?

    regrds,
    hoistler

    #41718 Reply
    Govindaraj
    Guest

    Hi hoistler,

    please check the BTS properties log , there u can see clock value which is different with u r installation clock value.

    Regards,
    Govindaraj.M

    #41719 Reply
    nica
    Guest

    govindaraj,

    aside from the BSC, is there any equipment between the BTS and TC? If you are using NOKia Flexihopper as the trs medium, try to upgrade the SW of the FH. Check also the parameters of all your transmission equipment i.e. the CRC. Check also the integrity of your clock source.

    #41720 Reply
    Govindaraj
    Guest

    Dear nica,

    I feel this alarm came due to the problem of clock source in BIO card . And one more think thia alarm cames mainly in TSDA only.

    Suggestion pls!!!!!!!!.

    Govindaraj

    #41721 Reply
    Oliver
    Guest

    Hi,

    You should verify the quality of your transport network between BSC and BTS. Is it a PDH or SDH, consider that BTS uses abis PCM to extract the clock but if you are using SDH you need to verify the clock reference for SDH network, it should be stratum 1.
    Also in PDH, Nokia recommends not to put more than 5 BTS’s into a chain.

    Finally, in new year eve we got many 2993 alarms. The problem was related to a severe radio control channels congestion under the coverage of one BSC which caused stop traffic in many BTS. It seems to be a SW bug still under study.

    BR

    #41722 Reply
    AMR
    Guest

    govindaraj

    Did you really clear 2993 problem or is this still happening?

    Please give advice if you did clear problem
    Thanx
    AMR

    #41723 Reply
    Rahul
    Guest

    hi all
    for oliver
    can u further explain SDH and PDH what r these and what r there roles in transmission

    thanx

Viewing 15 posts - 1 through 15 (of 22 total)
Reply To: BTS and TC unsync in Nokia BSC 3i
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