Digital communications network - has insertion of vacant characters filling gaps obtained by handling at progressively increasing clock rates

摘要

The digital communications network has an autonomous clock oscillator for each coupling point, the latter operating in exclusive frequency ranges which increase in the transmission direction. The incoming TDM signals are stored according to the transmission channel at each coupling point and handled at a higher clock rate with channel and frame synchronisation. The resulting signal gaps have vacant characters inserted in them and the resulting TDM signal with frame and channel synchronisation is extracted by a time multiplex technique according to the channel for subsequent transmission. The inserted vacant characters are removed before conversion of the TDM signal into a different format, eg a PCM analogue or digital signal.