Bi-directional data transmission and control system

Details Bi-directional data transmission and control system Bi-directional data transmission and control system

1979-07-09

1982-08-03

Chin, Tommy P.

Telecommunications

Interference signal transmission

455349, 358 86, H04N 710, H04B 350

Patent

active

043430422

ABSTRACT:
A bi-directional data transmission and control system utilizing a central processing unit and a multiplicity of remote subscribers. Each subscriber is provided with a terminal coupled with the central processing unit by a suitable medium such as a CATV channel. Each terminal is provided with a demarcation plane separating common circuitry from a number of specialty modules and a common bus therebetween for circuitry simplification, application expandability and individual tailoring. The data transmission scheme efficiently utilizes the frequency spectrum and enhances polling frequency by permitting selective polling of any given specialty module or subscriber at any given time and by permitting simultaneous polling of every subscriber for service calls, thereafter locating the caller with minimal polling. Data transmission protocol is expandable or contractable for each terminal independently of others and permits data transmission between any two points in the system. The system is zoned such that failure of one zone does not disable the entire system.

REFERENCES:
patent: 3717813 (1973-02-01), Lieberman et al.
patent: 3794922 (1974-02-01), Osborn et al.
patent: 3859596 (1975-01-01), Jannery
patent: 3934079 (1976-01-01), Barnhart
patent: 3997718 (1976-12-01), Ricketts et al.
patent: 40141473 (1977-08-01), Bardotti

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