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FACCH and TCH

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  • #63492 Reply
    Mr M
    Guest

    Hi All
    When the FACCH is used, there is a steal of TCH,
    How many Time SLots are replaced by FACCH?
    I saw somewhere, that in order to don’t feel a break in the communication, the 20ms sample of speach ( 8 time slot if second level of interleaving)is repeated by the Transcoder.
    Does it means that 8 time slot are replaced by FACCH
    And I presume that FACCH used the signaling frequency
    So it means that the handset repeat the same sample of speach, but during this period the MS use signaling frequency to send or receive FACCH
    Is that true?
    thank you

    #63493 Reply
    Bijoy
    Guest

    Hi
    FACCH uses 8 consecutive bursts of TCH.FACCH uses the same frequency as that of TCH.

    Br\\
    Bijoy

    #63494 Reply
    ajajy
    Guest

    facch takes 4 brusts per channel.
    we are using this for handover purpose,
    we handover takes place 1st we send facch for tch allotment in another location. but facch takes 4brusts so voice breaking takes place. thats why we mould the normal brust as 1/2 voice and 1/2 facch, so facch takes 8 brusts.

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Reply To: FACCH and TCH
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