System for implementing improved attempt-and-defer access conten

Details System for implementing improved attempt-and-defer access conten System for implementing improved attempt-and-defer access conten

1990-01-24

1992-11-17

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, H04J 314, H04J 324, H04J 308

Patent

active

051649411

ABSTRACT:
A unidirectional bus data communication system which eliminates uncertainty as to the integrity of data received by a receiver connected to the bus, which data may have been involved in truncating collisions. A plurality of data stations are connected to a unidirectional bus which has segments connected to and between the stations. Each of the stations is connected to an upstream segment by a sense (S) lead and to a downstream segment by a transmit (T) lead. Each station is adapted to sense energy via its S lead arriving on an associated upstream segment of the bus and includes a transmitter for transmitting data signals via its T lead on an associated downstream segment of the bus. Signal delay elements interconnect upstream and downstream segments of the bus bypassing each of the stations. The time delay D of each of the signal delay elements is a function of the total interval of a predetermined group of data signal bit durations of the data signals added to a period T.sub.d which is equal to the time between arrival of energy at an S lead and the instant when an associated transmitting means can, in response to such detection, stop transmitting energy on its T lead.

REFERENCES:
patent: 4234952 (1980-11-01), Gable et al.
patent: 4439763 (1984-03-01), Limb
patent: 4498168 (1985-02-01), Tseng
patent: 4779267 (1988-10-01), Limb
patent: 5012467 (1991-04-01), Crane
Borgonovo, "ExpressMAN: Exploiting Traffic Locality in Expressnet", IEEE Journal, vol. SAC-5, No. 9, Dec., 1987.

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