CIRCUIT SWITCHING SYSTEM FOR INTERCONNECTING LOGICAL LINKS BETWEEN PACKET SWITCHING NETWORKS

A circuit switching system for interconnecting end point systems, such as packet switches, compressed voice concentrators, or data multiplexers, by allowing multiple logical links on each logical channel. The circuit switching system is connected to the end point systems by a number of communication facilities with each facility having a plurality of logical channels. For packetswitches, the circuit switching system is responsive to a first request to establish a first logical link on a logical channel to a packet switch and is responsive to a second request for another logical link to that packet switch to establish a second logical link on the same logical channel. The circuit switching system is responsive to a third request for establishing a logical link to another packet switch on the same logical channel for denying this request and for negotiating another logical channel.