Cisco Systems 8600 Series manual SVCs

ATM and Frame Relay SVCs and SPVCs

Refer to the Cisco WAN Service Node Extended Services Processor Installation and Operation for Release 2.2 document for detailed information about SPVCs.

SVCs

A switched virtual circuit (SVC) only exists when there is data to send and a calling process has been initiated. With a switched virtual circuit, there must be some signaling mechanism to build a connection each time the user (ATM or Frame Relay device in this case) needs it. In addition, when the call is disconnected, there must be a mechanism for the orderly disconnection of the call, and the network’s resources must be relinquished. During a disconnect, the Cisco StrataCom network sweeps through its connection tables and removes the connection.

ATM SVCs are ATM connections setup and maintained by a standardized signaling mechanism between ATM CPE (ATM user end systems) across a Cisco StrataCom network. ATM SVCs are created on user demand and removed when the call is over, thus freeing up network resources.

Frame Relay SVCs are Frame Relay connections setup and maintained by a standardized signaling mechanism between Frame Relay CPE (Frame Relay user end systems) across a Cisco StrataCom network. Frame Relays SVCs are created on user demand and removed when the call is over, thus freeing up network resources.

ATM and Frame Relay SVCs, and SPVCs 8-3