Telephone metering interface with reverse signal sensor

Details Telephone metering interface with reverse signal sensor Telephone metering interface with reverse signal sensor

1976-06-14

1977-12-13

Claffy, Kathleen H.

179 8A, H04M 1528

Patent

active

040630374

ABSTRACT:
A sensing circuit is placed in the tip line of a subscriber's loop to sense, selectively, the placement of an outgoing, local call. The circuit includes a first LED for energizing a metering circuit upon detection of a billable call, and a second LED for latching the metering circuit in its energized condition within a predetermined interval after the billable call is detected. The metering circuit is automatically deenergized when the called party goes on-hook. A balancing circuit is included in the ring line of the equipment to balance the impedance created in the tip line by the sensing circuit; and the metering circuit can be designed selectively to produce a one-shot metering pulse for each billable call, or to produce a continuous signal for the duration of the call.

REFERENCES:
patent: 3579253 (1971-05-01), Edington
patent: 3652796 (1972-03-01), Kezuka
patent: 3936608 (1976-02-01), Danielson
patent: 3988549 (1976-10-01), Merlin et al.

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