Linear-space signalling for a circuit-switched network

摘要

A circuit-switched local area network relies on a star topology for data transfer. Signalling information is confined to a single common signalling link or channel. Contention on the signalling link or channel is obviated by the use of a contention resolution device which is coupled to all ports for receiving requests to send from the ports and for providing clear to send messages to the requesting ports, in turn. A port desiring communication with another port first raises its request to send and when it receives a clear to send from the contention resolution device, it places the message or call set up information on the signalling link or channel. Once the call or message set up information has been transmitted, the addressing port may de-assert its request to send which will result in the contention resolution device de-asserting the clear to send.