May 2006
Intermediate to advanced
480 pages
12h 20m
English
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4.5 Frame Relay
Frame Relay is a link-layer protocol used for large networks. It is specified in the following standards: I.122, I.441, and ANSI TI.606 and mostly in the standards of the Frame Relay Forum (FRF) group. See http://www.mfaforum.org.
Frame relay is usually used in permanent virtual circuits (dial-up lines are theoretically possible as well, but haven’t seen them in reality yet). A permanent virtual circuit is similar to a leased line. A user would rent virtual circuits in his or her particular locality from a Frame Relay provider.
A Frame Relay is a datagram-oriented and connectionless service; so unnumbered frames are transferred by it. The provider doesn’t guarantee the frame delivery. Each frame contains a checksum, so it is possible ...
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