Programmable subscriber line circuit partitioned into high voltage interface and digital control subsections

A high voltage analog circuit for a subscriber line interface circuit comprising:

• an input signal receiving unit, that is operative to condition and interface input voice and low voltage signaling and ringing signals, supplied from a low voltage, digitally programmable signal generation and processing unit;
• a multi-mode tip/ring amplifier unit, having tip and ring outputs thereof adapted to be coupled to tip and ring conductors of a subscriber loop pair, and inputs coupled to receive and amplify said voice and low voltage signaling and ringing signals, in accordance with the mode of operation of said subscriber line interface circuit, and as conditioned and supplied thereto by said input signal receiving unit;
• and
• a biasing unit, to which power for operating said high voltage analog circuit is coupled, and being operative to controllably couple prescribed bias voltages to said tip and ring amplifier sections of said tip/ring amplifier unit in accordance with the mode of operation of said subscriber line interface circuit.