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PVC (Permanent Virtual Circuit)
Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.
A virtual circuit is a pathway through a switched, mesh-type network that appears to be a dedicated, physically connected circuit. The virtual circuit is predefined and maintained by the end systems and nodes along the circuit, but the actual pathway through the packet-switched network may change due to routing around downed or busy connections. The important point is that packets are transferred in order over a specific path and arrive at the destination in order.
A PVC is a fixed circuit that is defined in advance by a public network carrier (or a network manager on an internal network). The permanence of the line removes the setup overhead and improves performance. A PVC is used on a circuit that includes routers that must maintain a constant connection in order to transfer routing information in a dynamic network environment. Carriers assign PVCs to customers to reduce overhead and improve performance on their networks.
In contrast, an SVC (switched virtual circuit) establishes a temporary virtual circuit between individual workstations, with sessions lasting only as long as needed. Once a communication session is complete, the virtual circuit is disabled. See "Virtual Circuit" for more information.
Copyright (c) 2001 Tom Sheldon and Big Sur Multimedia.