System for monitoring integrity of communication lines in securi

Details System for monitoring integrity of communication lines in securi System for monitoring integrity of communication lines in securi

1977-08-26

1979-05-15

Yusko, Donald J.

Communications: electrical

Digital comparator systems

340505, H04Q 900, G08B 2300

Patent

active

041550730

ABSTRACT:
A line monitoring system is disclosed which provides particular advantages to security systems having remote terminals. This system provides both a reduction in the required power for the line monitoring task and also increases the level of line security by generating a calculated response at the remote terminal, which calculated response could not be accidentally produced by a faulty remote unit. Futhermore, the calculated response at the remote unit greatly reduces the likelihood of clandestine entry at the remote site.

REFERENCES:
patent: 3593290 (1971-07-01), Kerr
patent: 3593293 (1971-07-01), Rorholt
patent: 3864578 (1975-02-01), Lackey
patent: 4002843 (1977-01-01), Rackman
patent: 4044351 (1977-08-01), Everson
IBM Technical Disclosure Bulletin, vol. 19, No. 4, 9-1976, "Secure Alarm Sensing Method" W. A. Boothroyd.

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