COMBINATION TASI AND ADPCM APPARATUS

摘要

A digital circuit multiplication system for interconnecting a transmission link having a plurality of bearer channels to a second plurality of telephone communication trunks, said communication channels being transmitted via a bearer bit stream, the second plurality exceeding the first plurality, and comprising: transmission apparatus at a first end of the transmission link including means for detecting signals on the second plurality of telephone communication trunks and means for assigning each trunk on which signals are present to an available one of the first plurality of bearer channels and for providing assignment messages indicating such assignments; adaptive differential pulse code modulation transmitting means operative to be coupled to the first plurality of bearer channels and to transmit speech signals in bit reduced form; combining means for receiving the output of the adaptive differential pulse code modulation transmitting means and combining them with said assignment messages along the first plurality of bearer channels; signal receiving and message detection means at a second end of the transmission link and being operative to receive the speech signals and assignment messages transmitted via said combining means and to strip the assignment messages therefrom; receiving apparatus coupled to the signal receiving and message detection means including means for receiving said assignment messages and assigning each of the first plurality of bearer channels carrying signals to a corresponding one of the second plurality of trunks in accordance with assignment information received from the transmission apparatus.