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Local Area High Speed Networks by Dr. Sidnie Feit

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Summary Points

  • A classic half-duplex Token Ring consists of a set of stations connected in a ring. The stations share a 4Mbps or 16Mbps bandwidth.

  • The physical wiring of a classic Token Ring looks like a ring of stars. Stations connect to concentrators in wiring closets.

  • A token circulates around the ring. A station with data to send captures the token, transmits one or more frames, and then sends a fresh token.

  • If early token release is used, a sender transmits a token right after the interframe gap that follows its final frame.

  • Frames that contain user data are called LLC frames. Frames that carry various types of protocol messages are called MAC frames.

  • The active monitor, which is chosen by an election process, watches over the token protocol. ...

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