Tip automatic number identification circuit

Details Tip automatic number identification circuit Tip automatic number identification circuit

1976-05-13

1977-10-18

Claffy, Kathleen H.

179 85, H04M 1536

Patent

active

040549429

ABSTRACT:
A circuit for identifying which one of two parties has initiated a toll call. Circuitry connected to the subscriber drop of one party, e.g., the tip party of a two-party telephone line, generates a ground mark during the toll ticketing condition when that tip party has initiated a toll call. Loop current sensing circuitry senses the loop current flowing in the subscriber drop to the tip party. Voltage sensing circuitry senses the potential, with respect to ground, on each conductor of the telephone line. Switching circuitry applies a groundmark to the telephone line when loop current flow to the tip party has been interrupted and negative potential is applied to the tip conductor. Circuitry is also provided which prevents the application of a ground mark when a ringing voltage is applied to the line.

REFERENCES:
patent: 2820848 (1958-01-01), Horwitz et al.
patent: 3005052 (1961-10-01), Powers
patent: 3278687 (1966-10-01), Everett
patent: 3863036 (1975-01-01), McCrudden
patent: 4001512 (1977-01-01), Proctor et al.

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