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the reason is certainly related to the fact that the speech is put in frame of 20ms. And when the GSM was invented, 20ms could be encoded/compressed/etc. into 4x0.577 ms.


20ms => 4x0.577ms = 2.3ms


each 20ms, one user needs 2.3ms.


So during 20ms on the air, only 8 calls can be multiplexed.



20/2.3 = 8.7



The remaining is used for in band signalling (sacch).

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