Communications: electrical – Condition responsive indicating system – With particular system function
Patent
1978-10-26
1980-10-21
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
With particular system function
340505, 340518, 340531, 340152T, 340534, G08B 2600, G08B 2900
Patent
active
042297346
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: 3654604 (1972-04-01), Crafton
patent: 3694757 (1972-09-01), Hanna
patent: 3710372 (1973-01-01), Anderson et al.
patent: 3713142 (1973-01-01), Getchell
patent: 3803594 (1974-04-01), Klein et al.
patent: 3863215 (1975-01-01), McGrogan
patent: 3914741 (1975-10-01), Bonser et al.
patent: 4155073 (1979-05-01), Ulch et al.
Caldwell Sr. John W.
Crosland Donnie L.
Honeywell Inc.
Joike Trevor B.
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