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Sylvain Munaut 246tnt at gmail.comHi > I am studying the TCH channel, and read the BB source. I find that > the structure of "TCH + SACCH" is depend on ts.that is when the timeslot > is even, the 12 of a TCH multiframes is SACCH,and the 25 is idle;and When > the timeslot is odd, the 25 of a TCH multiframes is SACCH,and the12 is idle. > > is that right? Yes > if that`s right, why ? To share the load. So that the BTS doesn't have to process all the SACCH of all the TCH at the same time. > I can`t find any Material about GSM 05.02 Clause 7 Table 1 of 9, the SACCH/TF entries Cheers, Sylvain