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E1 capacity

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    ahmed moa’ed
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    For MCS-9 needs 3 Idle Timeslot per 1 PDCH
    Mostly cells have 3 PDCHs (1 PDTCH + 2 Dynamic PDCHs)
    Total Idle Timeslot per site needed = 3 cells x 3 PDCHs x 3 Idle Timeslots = 27

    How many Abis E1s for supporting 27 Idle Timeslots with Site Configuration S4/4/4?
    Site Configuration S4/4/4 need number of Abis Sub-timeslot allocation as below.
    OML needs 1 timeslot (64kbps) = 4 sub timeslots (16kbps)
    RSL for S4/4/4 = 6 timeslots (64kbps) = 24 sub timeslots (16kbps)
    TCH for S4/4/4 = (12 TRXs x 8 TCHs) – (3 BCCHs) – (6 SDCCHs) = 87 sub timeslots (16kbps)
    Required 27 Idle Timeslots (16kbps)
    Total sub timeslots need for S4/4/4 = 4+24+87+27 = 142 sub timeslots = 2 E1s (1 E1 = 124 sub timeslots)

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