Parallel phone detection circuit

Details Parallel phone detection circuit Parallel phone detection circuit

1993-01-28

1995-02-28

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379212, 379157, H04M 358

Patent

active

053944658

ABSTRACT:
A parallel phone detection circuit is described, the function of which is to enable a phone call to be transferred from a first telephone set to a second telephone set. The detection circuit maintains the first telephone set connected to the telephone line until the handset of the second telephone set has been taken off-hook, and then disconnects the first telephone set. The circuit operates by detecting the line current from the telephone line and produces the reference value for comparison purposes related to that line current.

REFERENCES:
patent: Re31643 (1984-08-01), Waldman
patent: 2974282 (1961-03-01), Scheftelowitz et al.
patent: 4529843 (1985-07-01), Boeckmann
patent: 5095504 (1992-03-01), Nishikawa et al.
2206 Technical Digest (AT&T Technologies) (1985) Oct. No. 77 Berkeley Heights, N.J.; "An Economical Hold Feature For A Microprocessor Controlled Telephone", L. C. Frey.

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