Basic HTML version of Foils prepared Dec. 6 98

Foil 42 SDLC and derivatives (3)

From Introduction to Network WANs Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
1 HDLC - High-level Data Link Control
  • SDLC modified by ISO
  • considered to be compatible with SDLC; the same frame format; does not support loop or hub go-around
  • supports full-duplex, synchronous operation
  • 3 transfer modes:
    • Normal Transfer Mode (used also by SDLC) - secondary cannot communicate with primary without permission
    • Asynchronous Response Mode (ARM) - can communicate
    • Asynchronous Balanced Mode (ABM) - combine node: primary or secondary
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