Line supervision

Details Line supervision Line supervision

1978-10-25

1981-02-03

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

With particular system function

340505, 340534, 340151, 340152T, 179 5R, 364200, 364900, G08B 2900, G06F 700, H04Q 500

Patent

active

042491665

ABSTRACT:
A security system for supervising the integrity of a communication line 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 communication 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.

REFERENCES:
patent: 2814033 (1957-11-01), Meuhter
patent: 3516063 (1970-06-01), Arkin et al.
patent: 3713142 (1973-01-01), Getchell
patent: 3806872 (1974-04-01), Odom
patent: 3815093 (1974-06-01), Caretto et al.
patent: 3927404 (1975-12-01), Cooper
patent: 3978475 (1976-08-01), Schmitz
patent: 4019172 (1977-04-01), Srodes
patent: 4107656 (1978-08-01), Fainsworth

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