Basic HTML version of Foils prepared Dec. 6 98

Foil 48 Frame Relay (1)

From Introduction to Network WANs Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
Developed to address the slowness of X.25 network. FR specification removes flow control and error checking from the intermediate nodes.
FR evolved from X.25 and ISDN. It operates on the first and second layer of OSI Reference Model. The standard proposed in 1984.
Characteristics:
  • line speed: 56Kbps - 1.544 Mbps ---> 36 Mbps ---ᡥ Mbps
  • packet (variable size) oriented, switched communication method,
  • connection-oriented technology based on the leased point-to-point circuits (PVC - Permanent Virtual Channel)
  • not intended for time-sensitive applications due to its variable-length frames

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