Abstract: A packeting time of 6 ms is required for filling the information part of an ATM cell with 48 octets of a 64 kbit/s channel. This transit time is impermissably long for PCM voice connections. This situation is alleviated in that the information part of the ATM cells is subdivided into 24 fields of two octets each. Two respective data octets of a channel are then entered therein.

Abstract: A circuit for the subscriber termination in an integrated services digital network (ISDN) to which a number of individual terminals are connected by respective S-interfaces, or by S-interface busses respectively combining a number of terminals into a common ISDN network termination, each subscriber line having a B+B+D channel structure, has a switching matrix operated by a switching control for selectively connecting B-channels to each other or through-connecting a B-channel to a switching center. The D-channels in the transmission direction toward the switching control are supplied to an AND gate having an output which is a common D-channel connected to the switching control and which is also connected through a common D-echo channel to the D-echo channels in the opposite transmission direction associated with the S-interfaces.

Abstract: A circuit for the subscriber termination in an integrated services digital network (ISDN) to which a number of individual terminals are connected by means of S-interfaces, or by S-interface busses respectively connected in a number of terminals into a common ISDN network termination, each subscriber line having a B+B+D channel structure, has a circuit for interconnecting the D-channels of each of the subscriber line into a common D-channel connected to the common network termination, and means for connecting the common D-channel to each of said subscriber lines as a D-echo channel. The B-channels of each of the subscriber lines are connected in common to the B-channel leading to the common network termination, and the common D-channel from the network termination is connected in common as outputs to each of the subscriber lines.