Token passing network utilizing active node table

Details Token passing network utilizing active node table Token passing network utilizing active node table

1986-08-11

1988-05-24

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 89, H04J 326

Patent

active

047471000

ABSTRACT:
A programmable controller is adapted to communicate in a token passing logical ring network in a peer-to-peer fashion. The programmable controller is a station on the network and contains an interface which implements the network protocol. The protocol requires that each station maintain an Active Node Table which stores a complete map of the logical ring and the order in which the token is passed. The Active Node Table is automatically updated by monitoring each token pass on the network, where each token pass identifies the source and destination of the token pass. The Active Node Table is used in performing all routine network maintenance functions, including passing the token, adding stations, and dropping stations. The Active Node Table allows the formation of an Active Node Status Word for use by high level processes within the station. The Active Node Table also facilitates the inclusion of data in the token pass message.

REFERENCES:
patent: 4491946 (1985-01-01), Kryskow, Jr. et al.
patent: 4506360 (1985-03-01), Kryskow, Jr. et al.
patent: 4556974 (1985-03-01), Kozlik
patent: 4583088 (1986-04-01), Bux et al.
patent: 4649535 (1987-03-01), Ulug
patent: 4667323 (1987-05-01), Engdahl et al.
IEEE Standard 802.4-1984; Token Passing Bus Access Method and Physical Layer Specification Draft F, Jul. 1984.
Proway Local Area Network-Draft Standard Instrument Society of America, Jan. 1984.

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