Bilateral master station-plural satellite station signalling app

Details Bilateral master station-plural satellite station signalling app Bilateral master station-plural satellite station signalling app

1977-04-01

1979-07-24

Yusko, Donald J.

Communications: electrical

Digital comparator systems

178 66R, 325308, H04N 144, H04B 106, H04Q 900

Patent

active

041624831

ABSTRACT:
A bilateral digital signalling network couples a master station and plural remote, or satellite stations via a common communications link--as by way of an MATV coaxial cable. Any data/control signals may be interchanged by the system stations--for example sensor station and closure latches in an apartment complex security system multiplexing security signals on the MATV video program disseminating cable.
The system employs sequential multi-mode remote stations. In accordance with varying aspects of the present invention, encryption verification is required and performed on transmission address and data fields; satellite stations revert to a predetermined secure state if not polled frequently enough by a master station; and structure is provided to prevent a station from failing in a "talking" condition which blocks (masks) all upstream transmission.

REFERENCES:
patent: 3783194 (1974-01-01), Vilips et al.
patent: 3801960 (1974-04-01), Edwards
patent: 3934079 (1976-01-01), Barnhart

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