The Frame Relay frames are transmitted to the destination by virtual circuits to the destination point. Virtual circuits may be permanent (PVCs) or switched (SVCs). PVCs are set up administratively by the network manager for a dedicated point-to-point connection; SVCs are set up on a call-by-call basis.
Frame Relay offers an alternative to both dedicated lines and X.25 networks for connecting LANs to switches and routers. The success of the Frame Relay protocol is based on the following two underlying factors:
Because virtual circuits consume bandwidth only when they transport data; many virtual circuits can exist simultaneously across a given transmission line. Also each device can use as much of the bandwidth as necessary, and can operate at higher speeds.
The improved reliability of communication lines and increased error-handling sophistication at end stations allows the Frame Relay protocol to discard erroneous frames and eliminate time consuming error handling processing.
These two factors make Frame Relay a desirable choice for data transmission; however, they also necessitate testing to determine that the system works properly and that data is not lost
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