 The timeslot assignment capabilities of the codec were used to manage timeslots within the PCM group.The ACU contained a timeslot selection circuit that could select the same timeslot from up to eight PCM groups, (i.e.network timeslot 0-7 would select PCM timeslot 0, network timeslot 8-15 would select PCM timeslot 1, etc., giving eight opportunities for PCM timeslot 0 to connect to network).