Wire tap detection device with passive testing

Details Wire tap detection device with passive testing Wire tap detection device with passive testing

1986-02-21

1988-07-26

Dwyer, James L.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

For detection of eavesdropping device

379 6, H04M 168

Patent

active

047605928

ABSTRACT:
The device of the present invention discloses an electrical circuit which is electrically connected to a telephone line or data line between the telephone line or data line and the telephone set. In operation, the device continuously measures various electrical properties of the telephone or data line while a signal is passively generated on to the telephone or data line by simulating an on-hook to off-hook and back again condition of the telephone handset.

REFERENCES:
patent: 3751606 (1973-08-01), Kaiser, Jr.
patent: 3904839 (1975-09-01), Peoples
patent: 4110572 (1978-08-01), Cochrane
patent: 4186282 (1980-01-01), Ellson
patent: 4197435 (1980-04-01), Jackson et al.
patent: 4218592 (1980-08-01), Steinbergs et al.
patent: 4229626 (1980-10-01), Peoples
patent: 4304970 (1981-12-01), Fahey et al.
patent: 4413163 (1983-11-01), Basini
patent: 4611101 (1986-09-01), Walter et al.

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