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.
Thus, our theorem can also be used to show new results besides the Data Link result: For instance, the impossibility of token passing or resource allocation with crash failures and no NVM.
It is this aspect of the protocol that is the cause of the inefficiency, the delay associated with the token passing through idle stations to get to an active station.
Also, since it employs token passing with dual fiber-optic rings, FDDI is highly fault tolerant.
This logical ring remains constant and the token passing order cannot be changed.