Wire tap detection device

Details Wire tap detection device Wire tap detection device

1985-02-07

1987-01-06

Dwyer, James L.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

With blocking of normal usage

379 24, 379 32, H04M 168

Patent

active

046348131

ABSTRACT:
The present invention discloses a device for detecting the presence of an intruder listening device on a telephone or data line. The device comprises an electrical circuit electrically connected to the telephone line for measuring the values, polarity and electrical characteristics of the telephone line. These measured values are then compared with predetermined values for each electrical characteristic which are stored by the electrical circuit. An indicator is activated by the electrical circuit when the measured value varies from its respective predetermined value by more than a predetermined amount. The circuit, which is preferably microprocessor controlled, also includes a signal sweep generator for generating one or more electrical wave forms into the telephone line as well as a receiver which receives and analyzes the reflected signal from the telephone line.

REFERENCES:
patent: 4230914 (1980-10-01), Korwin et al.
patent: 4536703 (1985-08-01), Jablway et al.
Jules Gilder, More Telephone Accessories You Can Build, 1980, Section 22+23, pp. 100-105.

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