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OML down

Viewing 14 posts - 1 through 14 (of 14 total)
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  • #54790 Reply
    Mer
    Guest

    Hi

    OML = Operation & maintenace link (link with OMCR, for supervision)

    my question is: if we have OML down, can BTS realated with it carry traffic

    once I have see a BTS with OML down (OMC engineer see it(BTS) down and on the site OML LED blink), but BTS behavior (all LED’s for TRX, Abis and O&M) indicate that traffic is supported. it is possible ?

    just OML LED NOK

    note: OML was down because we had a faulty card in the BSC (I don’t know witch card)

    network:Alcatel B9, BTS A9100, BSC G2

    #54791 Reply
    Mangafull
    Guest

    Hi Mer

    OML cut = BTS down

    yes, OML is used for supervision but it also carry signaling, (no signaling=> no traffic). the behavior of BTS was good because O&M is up but if you restart BTS (switch off an on) you can see that your BTS is down.
    you said:”OML was down because we had a faulty card in the BSC” = if BSC can’t control BTS = 🙂

    #54792 Reply
    OML
    Guest

    hi friends

    I agree with mangafull, without OML communication can’t be established but how, this what I wont to know

    #54793 Reply
    Sumith
    Guest

    Hi

    Some reare case I had noticed, with out OML Alcatel G4 bts is working. Problem with the SUMA card in most case. Not a problem with BSC(TCUC card related to OML: you can see from OMC). If you power reset the BTS OML back to normal. But after few days OML will fault again.

    #54794 Reply
    OML
    Guest

    CLEAR

    #54795 Reply
    Tanuj
    Guest

    If OML is down it only means that OMCR is not able to monitor the bSC and BTS if the signalling with MSC is working then the bts and bsc will work fine, oml down doesnt mean traffic is down

    #54796 Reply
    Vito
    Guest

    If OML is down, BTS can carry traffic. OML down = no supervision.

    SUMA board is responsible for supervision at BTS

    Vito,
    NOC engineer

    #54797 Reply
    krish
    Guest

    Hi,

    then what it will affect ? will it not affect the traffic?

    #54798 Reply
    Rex
    Guest

    If Abis is OK and OML down that means BTS still works with the configuration it has in that moment and will carry traffic. But, it’s not possible to control BTS from OMC-R (do any changes etc.), you can’t know what it happens with BTS, is it really working or not. Somebody should go to the site and reset BTS.

    #54799 Reply
    KRISH
    Guest

    hI ,

    THANKS CAN U TELL ME WHAT IS RF PERFORMANCE ALARM IN ERICSSON .IS IT RELATED TO VSWR?

    (2)LOCAL MODE ALARM

    (3) TS SYNC FAULT ALARM

    (4) BTS INT AND EXT AFFECTED AND UNAFFECTED ALARM

    #54800 Reply
    Rex
    Guest

    Hi,
    I don’t know about Ericsson.
    BR

    #54801 Reply
    Muhammad Amir
    Guest

    We are VSAT service provider for GSM operators, we are facing a OML fault alaram on our MSC end over our VSAT media. Can anyone tell me that it can be a media fault or it comes from BTS or MSC end.

    we are using Ercisson BTS. when OML fault comes, our VSAT media is remain sync and shows UP but site goes down and after passed some hours, the site goes UP automaticaly without doing anything.

    Please Help !!

    #54802 Reply
    Pix
    Guest

    Hello,

    If the VSAT link is “up” while the BTS is rebooting, I would say the problem comes from the BTS itself.

    Does it happen regularly ?

    And only on one BTS ?

    I would check all BTS timers, ensure that they are well sized to take into account the 500ms RTT, and check the BTS Alarms to investigate what caused the BTS down.

    #54803 Reply
    lois
    Guest

    OML Means Transmission Issue But There are lot of Issue Related about OML fault.

Viewing 14 posts - 1 through 14 (of 14 total)
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