Telephonic communications – Subscriber line or transmission line interface
Patent
1990-01-29
1992-03-17
Dwyer, James L.
Telephonic communications
Subscriber line or transmission line interface
379398, 379387, H04M 100
Patent
active
050975030
ABSTRACT:
The connection circuit comprises a first differential amplifier circuit having its output connected to a first symmetrical amplifier circuit, a second differential amplifier circuit having its output connected to a second symmetrical amplifier circuit, a power supply and filter circuit for delivering power via a power supply series connection to the two symmetrical amplifier circuits, a balancing circuit, and a loop state signaling circuit. The two differential amplifier circuits are connected firstly to the output of a receive circuit and secondly to ground, and each wire of the line is connected directly via a respective resistor to a transmit circuit. Each symmetrical amplifier circuit is connected to one of the line wires via a contact of a ringing relay and a resistor connected in series. The power supply series connection includes a power supply transistor controlled by a signal indicative of the line being looped.
REFERENCES:
patent: 4484032 (1984-11-01), Rosenbaum
patent: 4540852 (1985-09-01), Albouy et al.
patent: 4567331 (1986-01-01), Martin
patent: 4677669 (1987-06-01), Kawami et al.
patent: 4829567 (1989-05-01), Moisin
patent: 4837818 (1989-06-01), Pieters et al.
patent: 4914693 (1990-04-01), Beck et al.
Alcatel Cit
Augustus Jhancy
Dwyer James L.
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