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How to calulate ater link

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  • #58970 Reply

    Hi Frnds,
    Pls explan the below things, I am confuged very much.

    (1) Where transcoders located–> MSC or BSC end

    (2) If i have a 660 TRX (BTS-4/4/4)capacity BSC then how much ater link require for above said capacity?-
    (3) How many E-1 require for A interface in the same senerio?

    Pls reply if u know.

    #58971 Reply

    Hi DK
    1.It can be located on either side.Usually it is near to MSC to reduce A-interface E1 cost.
    2.1 A-ter E1=30 circuits.
    1 TRX=8 circuits
    Now i think you can calculate yourself.
    Also take A-ter utilisation as 70%(max) while dimnsioning.
    2.1 Ater E1=4 A-inteface E1.
    This calculation is valid for TDM mode only.If you are using Abis over IP or HDLC,the calculated A-ter E1 will be quite less

    if you are in Ericsson,let me know,as this calculation is bit different there.

    #58972 Reply

    Hi Bjoy,

    I’m in ericsson Pls explain

    #58973 Reply

    Hi Ater being the dynamic path-i.e circuts get allocated only on need basis.So better ,if its to be calculated on the basis of carried traffic(Erlang) rather than number of circuits because if 90% TCH are configured as TCHD(dual rate-HR/FR),then total Ater requirement comes very high.In india still Abis is on TDM based PCMs,ofcourse Gb path genertally configured as Gb over IP.
    U can send ur email id so that i can send an excel sheet with calculation(formulaes also there)

    #58974 Reply
    hi Pratap

    Hi Pratap,
    My email Id is

    Pls send if if have the doc related to calculation.

    #58975 Reply

    Hi Pratap,

    My email ID is

Viewing 6 posts - 1 through 6 (of 6 total)
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