Line supervision

Details Line supervision Line supervision

G - Physics

08

B

340/70

G08B 26/00 (2006.01) G08B 29/06 (2006.01) G08B 29/08 (2006.01)

Patent

CA 1134923

ABSTRACT A security system for supervising the integrity of a communication line is disclosed having a supervising apparatus which generates first and second random signals, compares these first and second randomly generated signals to provide a third signal and compares this third signal to a fourth signal, and a transponder, also connected to the line, which compares the first and second randomly generated signals to provide the fourth signal to the com- munication line. The use of randomly generated signals increases the difficulty of breaching line security such that, when the supervisory apparatus detects a difference between the third and fourth signals, it can provide an appropriate alarm, indication, or control.

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