Data communication system

Details Data communication system Data communication system

1983-04-18

1986-11-11

Caldwell, Sr., John W.

Communications: electrical

Continuously variable indicating

With meter reading

3408255, 370 86, 370 85, H04Q 500

Patent

active

046225501

ABSTRACT:
In a ring network (1) messages sent from any one of a group of stations (3) to all the remainder include an acknowledgement field (ACK) holding a count preset to equal the number of expected destination stations. Each destination station that successfully receives the message acknowledges by decreasing the count by 1; acknowledgement is withheld if an error is detected in the message or the station cannot accept it. Acknowledgement is performed by a circuit (17) in a loop-through path (15) in an interface unit (4) connecting the station to the network (1). The originating station checks in a circuit (28) if the final value of the count on its return is zero. If so, the originating station is assured that each expected destination has made a positive acknowledgement of successful receipt.

REFERENCES:
patent: 3483329 (1969-12-01), Hunkins et al.
patent: 3652993 (1972-03-01), Bridwell
patent: 4034351 (1977-07-01), Takezoe
patent: 4149144 (1979-04-01), Diefenderfer
patent: 4511958 (1985-04-01), Funk
"The System Architecture of the Distributed Computer System--the Communications System" by D. J. Farber & K. C. Larson, Symposium on Computer--Communications Networks and Teletraffic, Brooklyn 1972, pp. 21-27.
Gordon et al., "Ringnet: A Packet Switched Local Nework with Decentralized Contro", 4th Conference on Local Computer Networks, Minneapolis 1979, pp. 13-19.

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