Subscriber line interface circuitry

Details Subscriber line interface circuitry Subscriber line interface circuitry

2007-03-13

2007-03-13

Tran, Sinh (Department: 2615)

Telephonic communications

Subscriber line or transmission line interface

Power supply

C379S324000

Reexamination Certificate

active

10814862

ABSTRACT:
Subscriber line interface circuitry includes an integrated circuit having sense inputs for a sensed tip signal and a sensed ring signal of a subscriber loop. The integrated circuit generates a subscriber loop linefeed driver control signal in response to the sensed signals. In one embodiment, A linefeed driver includes power circuitry for providing battery feed to the ring and tip nodes of the subscriber loop in accordance with the linefeed control signal. The linefeed driver includes sense circuitry providing a sensed tip signal and a sensed ring signal. The sensed tip and ring signals correspond to a tip current and a ring current of the subscriber loop. In one embodiment, the integrated circuit is a complementary metal oxide semiconductor (CMOS) integrated circuit. In one embodiment, the linefeed driver comprises only discrete components.

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