Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1991-05-14
1993-07-06
Dwyer, James L.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379412, 379394, H04M 100
Patent
active
052260780
ABSTRACT:
A telephone set having a voltage gain and control circuit element in series with the main current path of a line current control transistor, connected between first and second line end portions. The line current control transistor is connected between the first line end portion and the modulation terminal of the voltage gain and control circuit. A line current measuring resistor is connected between the reference terminal of the voltage gain and control circuit element, and the second line end portion. The rise of line current above a threshold is controlled by a second transistor connected between a threshold voltage source and the control electrode of the line current control transistor. The second transistor is also controlled by a compensating diode connected between the control electrode of the second transistor and the line current measuring resistor.
REFERENCES:
patent: 4626626 (1986-12-01), Coulmance
patent: 4731830 (1988-03-01), Thomson
patent: 4841566 (1989-06-01), Lott
patent: 5014308 (1991-05-01), Fox
patent: 5121425 (1992-06-01), Reicheit
Bailly Patrick
Coulmance Jean-Pierre
Chiang Jack
Dwyer James L.
Treacy David R.
U.S. Philips Corporation
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