token passing


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token passing

A communications network access method that uses a continuously repeating frame (the token) that is transmitted onto the network by the controlling computer. When a terminal or computer wants to send a message, it waits for an empty token that it fills with the address of the destination station and some or all of its message.

Every node on the network constantly monitors the passing tokens to determine if it is a recipient of a message, in which case it "grabs" the message and resets the token status to empty. Token passing uses bus and ring topologies. See token bus network and token ring network.
References in periodicals archive ?
As the traffic load increases, collisions cause the network to reach saturation earlier than with token passing networks.
This work resulted in a deeper understanding of the interoperability issues affecting Broadband Token Passing Bus protocols.
Some of these results are well known (the Data Link Impossibility result) and some are new (the Token Passing and Resource Allocation Impossibility results).
This, again, does not seem to be a feasible idea especially since an alternative, the token passing protocol, is available.
The two most commonly used protocols are carrier sense multiple access with collision detection (CSMA/CD) and token passing.
The most common Lan access methods are carrier sense multiple access with collision detection (CSMA/CD) for bus configurations, and token passing for most ring designs.