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Transcoder

Viewing 11 posts - 1 through 11 (of 11 total)
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  • #62219 Reply
    amit
    Guest

    can anyone tell me what is the basic function of TRANSCODER………..?

    #62220 Reply
    paraHO
    Guest

    Which type of transcoder?

    If you google you will see transcoders used for various tasks then you can identify the transcoder you want to know.

    #62221 Reply
    mit
    Guest

    i know abt which is used in telecom..?

    #62222 Reply
    paraHO
    Guest

    amit/mit

    transcoders can do various job the basics of one transcoder are not entirely the same as another transcoder

    Google search shows many links about various transcoders for telecoms

    also have you searched this forum:

    erlang.com/forum/erlang/search.html

    #62223 Reply
    Varun sharma
    Guest

    The use of transcoder is change the rate of voice.
    Transcoder change the data rate from 64kbps to 16kbps from MSC to BSC-BTS and from 16kbps to 64kbps from BTS-BSC to MSC. Because MSC accept or understand only 64 kbps data rate ( GSM Technology)

    #62224 Reply
    Anshu
    Guest

    thank Varun

    #62225 Reply
    paraHO
    Guest

    Ah! So you wanted to know about TRAU.

    #62226 Reply
    Anshu
    Guest

    yaaa

    can u havee..?

    #62227 Reply
    paraHO
    Guest

    Anshu, adding more to Varun sharma

    TRAU is for speech compression to save resources over air interface but also can help save line costs on terrestrial links.

    16kbps fullrate channel – the net bit rate is 13 kbps

    8kbps halfrate channel – the bit rate is 6.5 kbps

    TRAU is functionally assigned to BSS, it does not matter whether it is independently located (e.g. MSC)

    BTS and TRAU both have an interface for payload that is transparent for the BSC. The payload is formatted in TRAU frames [see GSM08.60] then transparently sent over PCM links btw TRAU and BTS in cylces 20ms each direction. Data contained in TRAU frames form the input and output values for channel coding.

    TRAU frames sent over traffic channels and not associated control channels.

    For fullrate channels every TRAU frame is 320-bits long. Halfrate channels can be possible for 160-bits long and 320-bits.

    There are four types of TRAU frame distinguished

    1) Speech frame used to transfer voice 260-bits fullrate channel, 112-bits halfrate channel

    2) O&M frame transfer O&M data btw BTS and TRAU. O&M 264-bits for full- and halfrate channel.

    3) Data frame carries 252-bits payload fullrate and 126-bits halfrate, but carries no voice.

    4) Idle frame for quiet times btw BTS and TRAU when DTX is active

    See GSM08.60

    BR

    #62228 Reply
    varun sharma
    Guest

    Thanks paraHO for detailed information.

    #62229 Reply
    Anshu
    Guest

    Thanx paraHO

Viewing 11 posts - 1 through 11 (of 11 total)
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