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
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)
X.121 addresses are used by X.25 PLP in call-setup mode to establish SVCs

© Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

If you have any comments about this server, send e-mail to webmaster@npac.syr.edu.

Page produced by wwwfoil on Sun Dec 6 1998