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interface Abis and Ater

Viewing 15 posts - 16 through 30 (of 65 total)
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  • #40862 Reply
    Pix
    Guest

    Hello Kwaku,

    I think you missed a step.. you can’t directly assume that 5000 calls = 5000 customers.

    Normally, you work with erlangs, and then should use an Erlang B law translation:
    5000 subscribers will perform 2 calls of 120seconds each during the busy hour.
    This is equivalent to 5000 x 120 x 2 = 1 200 000 seconds = 20.000 erlangs.

    Well, it becomes more complicated after that, that’s just a start.

    #40863 Reply
    vipul
    Guest

    hi everybody,

    can anyone answer me some of questions,
    1) what is the difference between E1 and A-ter?
    2) what is the capacity of ater?
    3)suppose that BSC having 8 ater, then what does it mean?, how many calls be made using this 8 ater , is there any relationship between them?

    regards
    vipul

    #40864 Reply
    Pix
    Guest

    hello,

    you should give a try to wikipedia, there are realy interesting stuff in there.
    – E1 is way to use a physical link:
    2Mb/s, 32 timeslots, ts0 reserved for framing/sync.

    – Ater is the interface between BSC and Transcoder, based on E1. You can see the Ater as the name of a link, and E1 is the protocol to “use” this link.
    Basically, 1 Ater = 1 E1.

    1 Ater = 32ts, but ts0 is already used –> 1 Ater = 31 useful ts.
    1 call on the radio interface will occupy 1/4 of an Ater timeslot.
    But you have also at least 1 signalling timeslot every 4 Ater interfaces.
    Roughly, you can safely assume that 1 Ater = 120 calls.

    1 BSC with 8 Ater means the BSC is connected to the transcoder with 8 E1 links. 8 * 120 = 960 simultaneous calls max.
    Regards,

    #40865 Reply
    nitin
    Guest

    plz anyone tell diff b/w ater and A interface?

    #40866 Reply
    NiceGuY
    Guest

    Connection between the BSC and the TRAU is denoted
    as Abis interface, while the connection between the
    TRAU and the Core Network (MSC) is denoted as A interface…
    B.R.

    #40867 Reply
    NiceGuY
    Guest

    SOrryyyy…. THe Connection between the BSC and the TRAU is denoted
    as “ATER” interface, while the connection between the
    TRAU and the Core Network (MSC) is denoted as “A” interface…
    B.R.

    #40868 Reply
    Jyoti Vimal
    Guest

    What is the capicity Of a BTS in terms of erlang. Plz explain.

    #40869 Reply
    pix
    Guest

    hello,

    bts capacity depends on how many TRX you put in it. (a trx is a transceiver board).

    1 TRX will (in average) carry up to 7 calls (8 timeslots in 1 TRX, 1 for signalling + 7 for calls). In case of half rate, 1 TRX = 14 calls.

    You can place up to 24 TRX in one BTS.

    24*7 = number of full rate calls
    24*14= number of half rate calls

    #40870 Reply
    Jyoti
    Guest

    How many erlang can a BTS deliver(Max.). Plz reply.

    #40871 Reply
    Pix
    Guest

    Jyoti,

    I just gave you the number of channels, i let you do the erlang conversion… it’s not that difficult, you’ll see.

    #40872 Reply
    vipul
    Guest

    hello
    can anybody answer me the following some questions?
    1) why the E1 is 2 mbps? why not it is greater or less then 2 mbps?
    what is the reason of it?
    2) how many TRX can be suppored by E1? can i put 14 TRX in single E1? if it is yes then how, or if it not then why?
    3) what is the T1, where it is used, what is the capacity of T1?
    4)why we use FXC E1/T1 in BTS?

    Thanks

    #40873 Reply
    Kamal kotecha
    Guest

    1.E1 is of 2mbps,bco’z it is defined in its standard….having 32 time slots of 64k….while T1 is of 1.54mbps…having 24 time slots of 64k…mostly e1 is used…
    2.in 1 e1 max 13 trx r possible,see the trafic manager for detail..where u define 14th one?
    4.e1/t1 is used when we want to drop or bypass physical channel in bts,..like when fiu is used,e1/t1 card is required….

    #40874 Reply
    TNS
    Guest

    Hi,

    the answer of question 2 is vendor depending because of the way of RSL multiplexing…
    T1 standard is used in South and North America

    BR

    #40875 Reply
    Sourabh
    Guest

    What is ater interface

    #40876 Reply
    Pix
    Guest

    Ater CS is the interface between the BSC and the TC.
    Ater PS is the interface between the BSC and the MFS.

    Regards,
    Pix

Viewing 15 posts - 16 through 30 (of 65 total)
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