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:
Apr. 27, 2010
Filed:
Aug. 02, 2006
Cary R. Murphy, Hickory, NC (US);
Mark K. Bridges, Hickory, NC (US);
Joseph Giovanni, Conover, NC (US);
David E. Vokey, Sidney, CA;
Daniel M. Goertzen, Winnipeg, CA;
Cary R. Murphy, Hickory, NC (US);
Mark K. Bridges, Hickory, NC (US);
Joseph Giovanni, Conover, NC (US);
David E. Vokey, Sidney, CA;
Daniel M. Goertzen, Winnipeg, CA;
Network Integrity Systems, Inc., Hickory, NC (US);
Abstract
Some or all of the optical fibers of a single-mode or multi-mode cable are monitored for intrusion by transmitting through the fibers a signal which can be analyzed for changes in its characteristics which are indicative of movement as a prelude to an intrusion event. To avoid independent monitors of all of the fibers, in some cases the same light signal is looped through a plurality of the fibers in series by passive jumpers. Switches can be used to disconnect out those fibers which are compromised. As an alternative a plurality of separate monitoring signals can be provided each associated with its own sensor where unique combinations of the signals are transmitted through separate fibers allowing a higher number of fibers to be monitored than the number of signals.