Basic HTML version of Foils prepared Dec. 6 98

Foil 46 X.25 (3)

From Introduction to Network WANs Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
1 X.25 protocol suite
  • maps to the lowest three layers of the OSI RM
  • PLP : Packet Layer Protocol (network layer); PLP modes: call setup, data transfer, idle, call cleaning, restoring
  • LAPB : Link-Access Procedure, Balanced (data-link layer); LAPB use I-frame (information), S-frame (supervision), U-frame (unnumbered)
  • X.21bis, EIA/TIA-232, EIA/TIA-229, EIA-530, G.703 (physical layer)
2 X.121 addresses are used by X.25 PLP in call-setup mode to establish SVCs
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