Answer supervision detection unit for pay telephone system

Details Answer supervision detection unit for pay telephone system Answer supervision detection unit for pay telephone system

1987-09-04

1988-07-26

Lev, Robert

Telephonic communications

With check operated control

At central office

379146, H04M 1700

Patent

active

047605944

ABSTRACT:
In one embodiment, an answer supervision detection unit is disposed intermediate a tandem switch and the public switched network. Typically, the public switched network is two or four wire E & M lines or T1 lines. The E & M lines carry answer supervision information signals. The answer supervision detection unit monitors the E & M lines, detects the information signals, converts those information signals into coded answer supervision signals, and applies those coded signals to loop start lines that extend from the answer supervision detection unit to the tandem switch, the central office owned by the regional Bell operating system and the customer owned pay telephone. Intermediate the pay telephone and the central office is a decoder that senses the coded answer supervision signals (typically the A,B,C and D signals of the DTMF phone) and generates pseudo-answer supervision or strictly control signals to the customer owned pay telephone.

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patent: 4638121 (1987-01-01), Clark, Jr.
patent: 4674114 (1987-06-01), Crouch et al.
patent: 4698840 (1987-10-01), Dively et al.

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