Token passing scheme for a predetermined configuration local are

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34082505, 3408255, 370 85, 370 86, G06F 100, H04Q 300, H04J 302

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active

047665300

ABSTRACT:
A system having a predetermined number of stations or nodes which all receive the broadcast messages. Each message includes a token value used by each node to access a token ring list. The entry accessed in the list determines whether the node has the token and can immediately transmit or whether the node must continue to wait for another message for a time out period equal to the entry. The token is passed around the ring of nodes and if a node fails, the node following the failed node in the ring will receive the token by default when the time out value retrieved from the token ring list is counted down to zero. Failed nodes that are activated will wait an infinite amount of time to receive a message containing a token value which starts the newly activated node counting down and thus brings the newly activated node back into the network in its proper sequence.

REFERENCES:
patent: 4491946 (1985-01-01), Kryskow, Jr. et al.
Intel, "iSCB 186/51S Computer Board Hardware Reference Manual", 1984, Intel Corp.
"Token-Passing Bus Access Method and Physical Layer Specifications", IEEE Standards for Local Area Networks, ANSI/IEEE Std 802.4-1985, pp. 15-19 and 42-62.

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