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about E1 to the MSC

Viewing 15 posts - 1 through 15 (of 22 total)
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  • #39691 Reply
    visu
    Guest

    Dear Friends

    Also please give me the details as how many E1 links are required to connect BSC’s with MSC and how it is connected and also about A interface.

    #39692 Reply
    S.Vijay
    Guest

    Hi Visu…

    How many BTS you want to connect ?

    Rgds

    scorplund1976@yahoo.com

    #39693 Reply
    visu
    Guest

    It is not number constraint. Suppose if I want to connect 100 BTS and these 100 BTS are connected to 20 BSC. please reply friends

    #39694 Reply
    S.Vijay
    Guest

    Nowadays…people use 300 TRX with a Single BSC….

    You are talking abt 20BSC – 100 BTS…

    Common Man…

    Serch for Jhon Scourious – Information on GSM Network …You can get whatever you want.

    Rgds

    #39695 Reply
    porkodi
    Guest

    Hi vijay,
    Consider the following scenrio if i am connecting the 1 BTS to the BSC through using 2 E1’s.How many E1’s should i connect between BSC and MSC.

    I know that using one BSC we can connect many TRX’s.So consider the above scenrio plz

    Regards,
    Porkodi

    #39696 Reply
    S.Vijay
    Guest

    I am serious now…I am a switch Guy…let me give you what I know…

    Dear Porkodi ( Are you from TamilNadu ),

    Lets Say :-
    ***********

    1 BTS with 2+2+2 Configuration.
    2+2+2 Means 3 Sectors and 2 ARFCN/TRX Per Sector.

    So Per Sector 2*8 Time slots.
    So that BTS has 2*8*3 TimeSlots.

    Total TS=48 in AIR Interface.
    In each sector dedicate 2 TS For BCCH and SDDCH.

    So remaining = 48-(2*3)=42 Speech TS in AIR Interface.

    Rgds…TBC…

    #39697 Reply
    S.Vijay
    Guest

    Now Between BTS and BSC :
    *************************

    Lets say One PCM is there.
    BTS Can put 4 Air Interface TimeSlots ( 16 K) in one PCM TimeSlot (64k).

    Got it…

    So 42 AIR TS fixed in 11 PCM TS.
    Ok add one more PCM TS For BCCH+SDDCH.(Let me be lavish)

    So Total 12 PCM TS for One BTS with 2+2+2 Config.

    Ok…

    TBC…

    #39698 Reply
    S.Vijay
    Guest

    Now Between BSC-TRA-MSC :-
    **************************

    BSC Recives those ( 12 PCM TS[64 k] ) 42 AIR TS in 16 K Rate.

    BSC Have to transfer them to 64 K Rate for MSC SWITCHING PURPOSE.

    BSC connects TRA Internally ( ERICSSON SWITCH).42 AIR TS in 16 K transfered to 42 – 64 K TimeSlot.

    So you need 2 PCMs between BSC and MSC ( still arnd 18/19 TS will be free for you ).

    …..What do you think guys.
    I should charge USD-500 as training FEE.

    Rgds

    #39699 Reply
    Palani
    Guest

    What if Between BTS and BSC, you’ve got E1 link (instead of One PCM)?
    Since you have 42 Speech TS in AIR Interface, you will need 2x E1, agree?

    #39700 Reply
    S.Vijay
    Guest

    Palani Anna…

    E1=PCM – Same Yaar

    #39701 Reply
    Palani
    Guest

    😛

    #39702 Reply
    kshitij
    Guest

    Thanks for ur valauble explanation sir. can i have ur Email ID for any future queries.

    #39703 Reply
    Porkodi
    Guest

    Hi,
    thanks for your answer.May be in future i will ask more questions in switch part.

    Thanks & Regards
    Porkodi

    #39704 Reply
    Neuil
    Guest

    Vijay, is below summary correct?

    Between BTS and BSC :
    *********************
    Need 2 PCMs

    Between BSC-TRA-MSC :
    *********************
    Also need 2 PCMs

    #39705 Reply
    S.Vijay
    Guest

    HI Neuil,

    Nice Question.I cannopt give you exact things…but for basics..

    Between BTS and BSC :
    *********************

    Number of TS =NTS

    Number of PCM = (NTS/4)/30

    Round it to next Integer.

    Like if you get 0.7 RESULT=1.
    If you gert 1.3 RESULT=2.
    Thi is not exact but use this for gainming knowledge.In practical…you may see different things.

    Between BSC(TRA)-MSC :
    *********************

    Think that TRA Always inside BSC.

    Number of Ater/A Interface PCM =

    ( Number of Traffic TS in AIR Interface ) / 30.

    This is BASICs ok…

Viewing 15 posts - 1 through 15 (of 22 total)
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