Basic HTML version of Foils prepared Dec. 6 98

Foil 25 Token Ring (3)

From Introduction to Local Area Networks LANs Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski


1 media access: Token Passing - information is traveling from station to station and is regenerated by each station; no collisions; possession of the token grants the right to transmit data
2 priority system: token ring networks use a sophisticated priority system that permits certain users and high priority stations to use network more frequently (frame contains priority field and reservation field)
3 One selected station works as active monitor: it acts as a centralized source of timing information; removal of faulty frames circling the ring
4 beaconing algorithm detects and tries to repair certain network faults
5 frames:
  • tokens : 3 bytes in length (start delimiter, access control byte, end delimiter)
  • data/command s: vary in size

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