Pay station telephone interface

Details Pay station telephone interface Pay station telephone interface

1986-09-29

1988-10-11

Lev, Robert

Telephonic communications

With check operated control

Coin signalling or control

379123, 379132, H04M 1702

Patent

active

047776471

ABSTRACT:
An interface (10) is disclosed for coupling a conventional pay station telephone (12) to a telephone switching system (16). The interface (10) provides supervision signal detection functions normally provided by a switching system, and thus can be connected thereto by a less costly business line (28). The interface includes processor controlled tone generators (72, 76) and detectors (73, 74, 81, 106, 108) for detecting tones and voltages transmitted by either the telephone (12) or the switching system (16). The interface (10) further includes a detector (106) and a procedure (FIG. 8) for providing an answer call indication. Coin collection or return is controlled by the interface (10) depending on the status of the call which is also determined by the interface (10).

REFERENCES:
patent: 3737576 (1973-06-01), Spencer
patent: 3760112 (1973-09-01), Busch
patent: 3997726 (1976-12-01), de Crepy
patent: 4028494 (1977-06-01), Zarouni
patent: 4192972 (1980-03-01), Bertoguo et al.
patent: 4326103 (1982-04-01), Oehrig
patent: 4599492 (1986-07-01), Otten
patent: 4706275 (1987-11-01), Kamil

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