802.5

Protocols

802.5

The 802.5 IEEE standard defines the Token Ring protocol which, like Token Bus, is another token-passing access method, but for a ring topology. A ring topology consists of a series of individual point-to-point links that form a circle. (See Figure A.3.)

Figure A.3: LAN Ring Topology

A token is passed from station to station in one direction around the ring, and only the station holding the token can transmit packets onto the ring. Data packets travel in only one direction around the ring. When a station receives a packet addressed to it, it copies the packet and puts it back on the ring. When the originating station receives the packet, it removes the packet.

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