Patent ID: 7260214

Claim:
A subscriber line interface circuit, comprising: a high voltage analog section, containing analog circuits including tip and ring amplifiers driving tip and ring conductors, respectively having operational parameters thereof established in accordance with respective programmable bias currents supplied thereto by programmable bias current sources coupled to said analog circuits, and to which power sufficient for any signaling conditions of said tip and ring conductors of a respective subscriber loop pair is supplied, and being operative to drive said tip and ring conductors of said respective subscriber loop pair in accordance with analog input and analog control signals supplied thereto; and a low voltage, digitally programmable signal generation and digital signal processing section comprising a DSP-based CODEC and a programmable supervisory digital controller; tip and ring sensing circuitry coupled to said tip and ring amplifiers for sensing operational characteristics of said tip and ring amplifiers, respectively, a feedback connector coupling said tip and ring sensing circuitry to said programmable supervisory digital controller to permit said programmable supervisory digital controller to monitor said operational characteristics; wherein said DSP-based CODEC is operative to interface voice and ancillary signals including low voltage signaling and ringing signals with said analog circuits of said high voltage analog section, and said programmable digital controller is operable, to program values of said respective programmable bias currents supplied by said programmable bias current sources, so as to establish said operational parameters of respective ones of said analog circuits of said high voltage analog section.