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GSM basics

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Viewing 15 posts - 136 through 150 (of 157 total)
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  • #34550 Reply

    Hi everybody,
    can anybody tell me what is BCF and LAPD in NOKIA ultrasite BTS.
    And what is their function.

    #34551 Reply

    Hi Gurujinder,
    In nokia terms BCF is Base control function. It is logical identification number of a any cell site as BSC sees it software point of view. When you want to creat new site in BSC database or modify the site parameters in BSC database these modifications are done with ref to BCF number of that cell site.

    LAPD is Link access protocol on D channel. It is a GSM layer 2 protocol defined to fascilate signaling between BSC and TRX in the BTS.When you define a signaling for perticular TRX in BTS via mapping it is nothing but LAPD for that TRX.

    #34552 Reply

    Hi Soumendra,

    As PIX said both Half and Full rate are better.
    Basically Full rate means more bits uesed to represent voice and good clearity typically 13 kbps and half rate means number of bits used to represent voice is halfed using diff compression techniques and it is 5.6 kbps normally. If full rate is configured on TRX one GSM slop will carry one voice call but if half rate is configured same slot can carry 2 voice calls. So decision to use half rate or full rate is decided on trafiic requirement, no of calls taken by that TRX, Voice quality needed.

    #34553 Reply

    Hello Swanand,

    For me, his question is just a spam… no need to reply “seriously” to that 🙂 (just my opinion, no offence)

    #34554 Reply
    rakesh solanki

    how the multiplexing is done betn bsc & tc ,also betn Tc & msc?

    #34555 Reply

    can anyone give me the meaning and definition of the following terminology in congestion control of mobile system ( trx tu tx tdma,tch sddch and so on …..)

    #34556 Reply

    Hi PIX,
    I understand what u said. I have seen many peoples working in telecom for many years but do not know the meaning of such things. I guess this blogging could help them somewhat.

    #34557 Reply

    does anyone know how can i see bcch ftd (net monitor in symbian)

    #34558 Reply
    Nasir Ali Khan

    can u plz explain that what r the basic funcation of Status cards(BB2F) in nokia BTS.

    #34559 Reply

    how can we put the power in TRX is it from directly from Laptop to BTS(at the time of comm ) or Power from the BSC. Give me answer as soon as possible .

    #34560 Reply

    Hi Nasir,

    BB2F card in nokia BTS solutions has main function of handling baseband signal processing in BTS(hence BB in the name which stands for base band). One card controls 2 TRX’s.
    Each BB2F card has two identical circuits inside with DSP and other processors to handle functionality of each TRX such as controlling TRX oscillators according to defined frequencies and hopping parametes and other RF parameters, processing baseband signal and align it to and from E1 or T1 interface and baseband error correction.

    #34561 Reply

    hi sawanand.
    how r u. actually i would like to learn the basics of telecommunications. can you help me in this metter?

    #34562 Reply

    Hi Rafil,

    Can u elaborate on what topics you are interested to know about?

    #34563 Reply

    My question is about antenna used in GSM BTS. Why cross polarization technique is used?

    #34564 Reply


    cross polarization is a technique to provide reception diversity.
    the other technique is called “space diversity”.

    i think you can find good explanations on wikipedia.

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