Patent ID: 7050577

Claim:
A subscriber line interface circuit comprising; a high voltage analog section, containing analog operational circuits, operational parameters or which are programmable in accordance with respective bias currents supplied thereto, and to which power sufficient for any signaling conditions of 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, that is operative to interface voice and ringing signals with said analog circuits of said high voltage analog section and to monitor and control operational characteristics of said analog circuits of said high voltage section, said low voltage digitally programmable signal generation and digital signal processing section including a digital signal processor (DSP) based codec, that is operative to interface said voice and ancillary signals, including low voltage signaling, and ringing signals with said analog circuits of said high voltage analog section; and a supervisory digital signal processor, separate from said codec, that is operative to program respective values of bias currents that control operational parameters of respective ones of said analog operational circuits, said bias currents as programmed by said supervisory digital signal processor being coupled to said analog operational circuits and thereby establishing said programmable operational parameters thereof wherein said high voltage section includes a control and latch interface unit that is operative to receive and store from said supervisory digital signal processor a plurality of digital input signals for defining values of said bias currents through which said operational parameters of said respective ones of said analog operational circuits of said high voltage section are established.