Control circuit for telephone subscriber station

Details Control circuit for telephone subscriber station Control circuit for telephone subscriber station

1978-09-25

1980-09-09

Brigance, Gerald

179 17D, H04M 1300

Patent

active

042219353

ABSTRACT:
A control apparatus for providing added service telephone features for stations of a multiple party line. Features provided are automatic number identification, party line privacy, fully selective ringing, remote station verification and disconnect and revertive calling. Apparatus to provide these features includes as the control logic, a conventional microprocessor acting on external logic and buffer memory interfacing with the line conductors. The external logic and buffer memory sense the input condition changes and provide signals indicative of these changes to the processor. The external logic and memory maintain a condition and monitor the line for condition change.

REFERENCES:
patent: 2874223 (1959-02-01), Hutton
patent: 2923776 (1960-02-01), Richards
patent: 3026377 (1962-03-01), Sullivan
patent: 3566039 (1971-02-01), Saunders
patent: 3689705 (1972-09-01), Pinede et al.
patent: 3919487 (1975-11-01), Gabrielson

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