Low voltage two wire to four wire telephone circuit converter ap

Details Low voltage two wire to four wire telephone circuit converter ap Low voltage two wire to four wire telephone circuit converter ap

1983-03-08

1985-11-19

Dwyer, James L.

179 37, H04B 158

Patent

active

045544166

ABSTRACT:
A low voltage two wire to four wire telephone circuit converter apparatus utilizing a series pair of amplifiers to provide a transmit data out signal that is referenced to analog ground. A pair of amplifiers in parallel to receive a receive data in signal which is referenced to analog ground and apply it to the telephone unit. A signal adapter converts the telephone ring signal to a constant one level for transmission over a digital channel in a fiber optic link.

REFERENCES:
patent: 2929883 (1960-03-01), Durbin et al.
patent: 3150236 (1964-09-01), Gorgas et al.
patent: 3917907 (1975-11-01), Bartelink
patent: 4041252 (1977-08-01), Cowden
patent: 4161633 (1979-07-01), Treiber
patent: 4232293 (1980-11-01), Harris
patent: 4306313 (1981-12-01), Baldwin

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