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A logical circuit created
to ensure reliable communication between two network devices. A virtual circuit
is defined by a virtual path identifier/virtual channel identifier (VPI/VCI)
pair, and can be either a permanent virtual circuit (PVC) or switched virtual
circuit (SVC). Virtual circuits are used in Frame Relay and X.25. In
Asynchronous Transfer Mode (ATM), a virtual circuit is called a virtual
channel. Sometimes abbreviated VC. See also PVC, SVC, VCI, virtual
route, and VPI.
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