Frame Relay

• A modern, light-weight interface to data networks

• Internationally standardized (ITU-T I.233)

• ”The X.25 of the 1990’s”

• A connection-oriented data link layer service

• Based on the same paradigms as LANs:

  • Relatively high transmission speed
  • Reliable transmission
  • Small protocol overhead

• Enables service differentiation (quality of service)

• A LAN-like service in public data networks

• Frame structure modified from LAPD

• Detects transmission errors

• No error correction

• Can support a variety of physical interfaces

• Mainly used at 64 kb/s to 2 Mb/s transmission speeds

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