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GSM Backbone synchronization&Time delay

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  • #42299 Reply
    Ayman
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    Could you explain GSM Backbone synchronization & Time delay

    Thanks

    #42300 Reply
    srini
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    HI Ayman,

    As far as i know , each equipment in the n/w has to be sync’d to teh master clk . The Master clk can be derived from PSTN PCM streams then MSC -XCDR- BSC-BTS . The interconnecting backbone equipments also has to derive the clk from the E1s which interconnect the above elements .

    In case on Siemens STM equipments the E1s are selected and priority is fixed to sync the STM nodes . as the STM packed structure requires clk for exactly reproducing the STM packets .

    secondly the delay , i think it should be propogation delay , when a signal passes from one end of the node to the other node . the signal has to travel a distance , which induces a time delay . further in case of Repeater stations the signals are first captured then reshaped – amplified and reproduced , for these process ,time is required . hence time delay .

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