Loop type data highway system

Details Loop type data highway system Loop type data highway system

1982-07-06

1985-04-09

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

370 86, 34082508, H04Q 900

Patent

active

045104948

ABSTRACT:
A loop type data highway system in which a plurality of data transmission control stations (abbreviated herein as stations) are connected in cascade to a loop transmission line. Each of the stations responds to a polling frame inquiring of request for reservation of the transmission line. The polling frame is composed of a first field for inquiring of the line reservation request and a second field indicative of whether the line is reserved or not. Each station receives signals inputted from the upstream side along the line and sequentially repeats them to the downstream side along the line without delay. In the station having the line reservation requests, a pattern representative of the line reservation is written in the second field after reception of the first field and sends out the polling frame to the downstream. When the second field as received indicates the non-reserved state of the transmission line, transmission of data is initiated in succession to the second field.

REFERENCES:
patent: 3755786 (1973-08-01), Dixon et al.
patent: 4236245 (1980-11-01), Freeny et al.
patent: 4237553 (1980-12-01), Larsen
patent: 4335426 (1982-06-01), Maxwell
patent: 4346440 (1982-08-01), Kyu et al.
patent: 4383315 (1983-05-01), Torng
Abstract Page, European Patent Application, Publication Number 0054077 "Method of Transmitting Information Between Stations Attached to a Unidirectional Transmission Ring", B. Werner et al., Jun. 23, 1982, (Bulletin 82/25).

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