PVC

PVC stands for Permanent Virtual Circuit. It is a fixed communication circuit, created and maintained even when no data is being transmitted. The only difference between a PVC and a Switched Virtual Circuit (SVC) is that an SVC must be reestablished each time data is to be sent. Once the data has been sent, the SVC disappears. PVCs are more efficient for connections between hosts that communicate frequently. PVCs play a central role in Frame Relay networks. They're also supported in some other types networks, such as X.25.