High voltage subscriber line interface circuit

Details High voltage subscriber line interface circuit High voltage subscriber line interface circuit

H - Electricity

04

M

379/67

H04M 7/00 (2006.01)

Patent

CA 2029139

A HIGH VOLTAGE SUBSCRIBER LINE INTERFACE CIRCUIT ABSTRACT A high voltage subscriber line interface circuit is disclosed which is connected via a subscriber loop to a subscriber station. The subscriber line interface circuit of the present invention includes a tip and ring drive amplifier circuits that supply feed current to the subscriber loop. A common-mode amplifier circuit connected to the subscriber loop senses the voltage dropped across the subscriber loop and outputs a control voltage to the tip and ring drive amplifier circuits. The control voltage offsets the feed current applied to the subscriber loop and develops a balanced longitudinal impedance. A differential amplifier circuit connected to the subscriber loop detects and converts differential transmit voice signals into a single unitary output signal. The unitary output signal is applied to an AC summing amplifier circuit where it is summed and combined with a receive voice signal that is intended to be transmitted to the subscriber station. The resultant summed output signal is then applied to a phase splitter amplifier circuit. The phase splitter amplifier circuit develops a pair of balanced output signals from the summed voice signals that are equal in amplitude but 180 degrees out of phase with each other. Each of the output signals is connected to a respective one of the tip drive and ring drive amplifier circuits for transmission on the subscriber loop. A tip-party mark detector circuit is also included that produces a logic signal output when a voltage difference between the output signal of the common-mode amplifier circuit and a reference voltage is detected.

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