The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 24, 1979
Filed:
Apr. 01, 1977
Alan W Entenman, Hicksville, NY (US);
Intech Laboratories, Inc., Bohemia, NY (US);
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.