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URGENT, PLEASE–ALU BSC drops due t

Viewing 15 posts - 1 through 15 (of 15 total)
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  • #61432 Reply
    SHAFAR
    Guest

    hello guys,

    as i see there are lots of profis here so please help me if you can, I will be very much grateful

    during 2 days i’m facing huge dropped call rate of remote transcoder failure in one my BSC, it’s more than 3% for yesterday. it increased six times.
    completely all cell are affected. it was more than 2000-2500 of drops per every cell yesterday.
    I have no alarms in omc and drive-test didn’t help me also.

    Where should i start my investigation? One hint, please help me anybody if you can

    Thanks in advance

    BR, Shafar

    #61433 Reply
    SHAFAR
    Guest

    I work on A9130 B9
    Thanx in advance

    #61434 Reply
    lily
    Guest

    Good evening, Shafar!

    ๐Ÿ™‚

    This very morning I has been working on the same problem for one of our MX BSCs. – enormous MC739 (Number of dropped calls due to remote transcoder failure) counter.
    (as I see you also have a problem with MX BSC they must be twins I think :)))
    From my experience – in 99,9% of cases the cause is faulty MT120 board. The question is how to find it (and the sooner the better :)) especially if you have a lot of Aterm (> 20).

    You can get from NPO or RNO statistic for Aint-channels (in NPO this option is available only if you have working zone with less than 2000 cells) – particularly for that BSC for several hours. There are only 2 counters: C750 and C751.

    C750 – TIME_A_CHANNEL_BUSY

    C751 – NB_A_CHANNEL_ALLOC if my memory doesn’t trick me

    C750/C751 is average duration of Aint channel occupation.

    Normally it ought to be around 30 – 40 sec. Of course you see much grater range in your values, but be very careful – if you see some channels where during some hour successively this value is around 3-3,5 sec – you are lucky and you’ve found faulty link.
    Than – define an Ater link and reset MT120. It’s not bad to shutdown traffic on it before of course :))
    Sometimes it doesn’t help and you should to change MT120 but it happens – as I see in our network – seldom.

    Good luck!

    #61435 Reply
    Sergio
    Guest

    What am i seeing?
    Lilu you should be in bed many hours ago it’s midnight there as i remember
    now you musn’t worry, should sleep well, eat well and behave yourself well too :0))

    #61436 Reply
    SHAFAR
    Guest

    Lily thanx alot
    your explanation is very clear
    but i have no rno or npo
    can i get necessary data anywhere else?
    many thanxes

    #61437 Reply
    lily
    Guest

    Shafar,

    You can use raw data – it’s PM type 18. Files stores on OMC-R server, you can find them there:

    /alcatel/var/share/AFTR/APME/OBSYNT/BSC_xxx(your number)….

    something like that, i’m writing by memory ๐Ÿ™‚
    they are easy to read and understand.
    Good luck!
    write if you have questions

    Sergio,

    Thank you very much for your care, but you know instant messengers aren’t difficult in use ๐Ÿ™‚
    you have my skype contact ๐Ÿ™‚

    #61438 Reply
    Pix
    Guest

    Shafar,

    in which country are you working ? we’ll push your boss to buy NPO !! That is a perfect example why you should buy it. Look how many calls you lost because of that… how much money it represents ๐Ÿ™‚

    Lily : call drops due to RTC could be due to anything, from TRX failure, to Abis, BSC, Ater or MT120 failures. Not only MT120… But I gueess, you meant when there are so many rtc drops all over the place, it is then probabl due to mt120… then agreed !

    cheers
    pix

    #61439 Reply
    SHAFAR
    Guest

    sorry, guys, i must disturb you again with questions

    at last i found that channels with very short time of occupancy it’s really always less then 4 sec
    here they are
    1411
    1424
    1437
    1444
    1459
    1469
    1474
    1483
    1491
    1501
    1513
    1521
    1528
    1533
    i am confused to which A-TERmux they belong?
    please help me again

    Mr. Pix,
    thank you for help but i doubt that anything can convent our owner to invest money in equipment now
    we supposed to buy rno last year

    #61440 Reply
    FR
    Guest

    It is your 20th AterMux.

    #61441 Reply
    lily
    Guest

    hm-m..
    FR, are you sure?
    As for me, it looks like 12th…

    Dear Pix, your word?

    #61442 Reply
    Rex
    Guest

    Hi,
    it’s 45, 46, 47 and 48 PCM, which is 12th AterMux.
    Regards,
    Rex

    #61443 Reply
    FR
    Guest

    oops Sorry guyz.. Yes, its “12th”

    #61444 Reply
    Pix
    Guest

    Yes, it seems to be the 12th atermux ๐Ÿ™‚ TS29 is bad on all 4 interfaces, but i’m not sure what it means… MT120 faulty or misconfig of TS at MSC side ?

    Shafar :
    For info the excel formulas go like this (with # being the number you have listed below)

    Atermux = INT(#/32) + 1
    A PCM = INT(Atermux/4) + 1
    TS = MOD(#,32)

    Ater Mux = 12, A PCM = 45 TS 3
    Ater Mux = 12, A PCM = 45 TS 16
    Ater Mux = 12, A PCM = 45 TS 29

    Ater Mux = 12, A PCM = 46 TS 4
    Ater Mux = 12, A PCM = 46 TS 19
    Ater Mux = 12, A PCM = 46 TS 29

    Ater Mux = 12, A PCM = 47 TS 2
    Ater Mux = 12, A PCM = 47 TS 11
    Ater Mux = 12, A PCM = 47 TS 19
    Ater Mux = 12, A PCM = 47 TS 29

    Ater Mux = 13, A PCM = 48 TS 9
    Ater Mux = 13, A PCM = 48 TS 17
    Ater Mux = 13, A PCM = 48 TS 24
    Ater Mux = 13, A PCM = 48 TS 29

    #61445 Reply
    SHAFAR
    Guest

    Thank you guys very much

    You’re very kind and helped me so much
    actually i did not see any alarms on 12th MT120 but after its reseting everything is OK
    during last time no drops MC739 on all BSC

    thanx for formulas it’s clear how to calculate

    thankx to all of you

    #61446 Reply
    Antony B Jouh
    Guest

    very usefull thread

    it was just in time for me and helped to fix my trouble

    thank you all, guys

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