Describe a switched virtual circuit versus a permanent virtual circuit.
What will be an ideal response?
A switched virtual circuit (SVC) is a two-way channel established from node to node, through a frame relay switch. The circuit is a logical circuit that is established only for the duration of the data transmission. After the transmission is completed, the channel can be made available to other nodes. An SVC is used for connections that have intermittent data transfers, such as a business that periodically transfers payroll data to a payroll processing center in a bank.
In contrast, a permanent virtual circuit (PVC) is a logical communications channel that remains connected at all times. The circuit remains in place even when data transmission stops. A PVC is used for frequent data transfers, such as for a connection between a branch bank office and the main bank in which customer records are updated continuously throughout the day.
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