Telephonic communications – Line equalization or impedance matching
Reexamination Certificate
2007-02-20
2007-02-20
Tran, Sinh (Department: 2615)
Telephonic communications
Line equalization or impedance matching
C379S399010
Reexamination Certificate
active
09298008
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. The linefeed driver does not reside with the integrated circuit. In one embodiment, the 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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Hein Jerrell P.
Sooch Navdeep S.
Davis William D.
Davis & Associates
Silicon Laboratories Inc.
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