Telephone receiver-off-hook detector

Details Telephone receiver-off-hook detector Telephone receiver-off-hook detector

1976-06-28

1977-07-05

Robinson, Thomas A.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

1791752C, 324 51, H04M 322

Patent

active

040341615

ABSTRACT:
A controlled-amplitude, alternating test signal at a central office is applied to a telephone subscriber's line. The nonlinear impedance vs. voltage characteristic of the subscriber's telephone in an off-hook state causes harmonics of the test signal to be generated. A harmonic so generated is detected at the central office, which indicates the presence of a receiver-off-hook telephone.

REFERENCES:
patent: 3287502 (1966-11-01), Rohrig

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