Method and apparatus for locating telephones

Details Method and apparatus for locating telephones Method and apparatus for locating telephones

1980-02-19

1981-09-29

Robinson, Thomas A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

179175, 324 60CD, H04M 124

Patent

active

042924804

ABSTRACT:
A method and apparatus are disclosed for determining the presence of an out-of-service telephone in a building. The method comprises the steps of electrically isolating the building interior and exterior loops, determining if the electrical resistance of the interior loop is within a selected range, determining if the electrical capacitance of the interior loop exceeds a selected capacitance level, and generating a telephone present signal should either the determined resistance be within the selected resistance range or the determined capacitance exceed the selected capacitance level.

REFERENCES:
patent: 3870837 (1975-03-01), Adams et al.
patent: 4022990 (1977-05-01), Bauer
patent: 4054760 (1977-10-01), Morgen

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