Telephonic communications – Subscriber line or transmission line interface – Power supply
Reexamination Certificate
2007-08-21
2007-08-21
Kuntz, Curtis (Department: 2614)
Telephonic communications
Subscriber line or transmission line interface
Power supply
C379S395010
Reexamination Certificate
active
11295901
ABSTRACT:
A subscriber line interface circuit has a battery-powered, high voltage analog section, that drives tip and ring lines of a subscriber loop, and a mixed signal (low voltage and digital signal processing) section, that monitors and controls the high voltage analog section. An input signal receiving unit of the high voltage analog section conditions input voice and low voltage signaling and ringing signals from the mixed signal section, for application to a dual mode, programmable gain, tip/ring amplifier coupled to the loop. A sense amplifier at the output of the tip/ring amplifier is through an auxiliary amplifier to an analog feedback monitor port for closing a loop to synthesize the circuit's output impedance.
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Berrios Edward A.
Enriquez Leonel Ernesto
Youngblood Douglas
Akerman & Senterfitt
Intersil America's Inc.
Jetter Neil R.
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