Method and apparatus for removing FSK in-band signaling

Details Method and apparatus for removing FSK in-band signaling Method and apparatus for removing FSK in-band signaling

1996-10-17

1998-06-16

Zele, Krista

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379142, 379215, 379258, 379399, H04M 156

Patent

active

057683670

ABSTRACT:
A circuit for use with a SCWID adjunct to remove A.C. in-band signaling tones from the voice path to a telephone apparatus serially connected to the adjunct. The A.C. signal component is carried on top of the D.C. voltage used to power the telephone. The circuit includes means to monitor the D.C. voltage level and to pass this voltage substantially unchanged to the telephone. The A.C. signal in the form of a FSK tone, received from the central office, is used by the adjunct to provide a subscriber with call feature information such as the identity of a calling party while the telephone is off-hook.

REFERENCES:
patent: 4549129 (1985-10-01), Hing et al.
patent: 4581487 (1986-04-01), Cochran
patent: 5263084 (1993-11-01), Chaput et al.
patent: 5337354 (1994-08-01), Gadsby
patent: 5526406 (1996-06-01), Luneau
patent: 5574777 (1996-11-01), Lewis
patent: 5583924 (1996-12-01), Lewis
patent: 5686820 (1997-11-01), Riggio, Jr.
patent: 5694465 (1997-12-01), Apfel

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