Programmable device and methods for disabling a ring signal...

Details Programmable device and methods for disabling a ring signal... Programmable device and methods for disabling a ring signal...

2007-03-27

2007-03-27

Tran, Sinh (Department: 2646)

Telephonic communications

Subscriber line or transmission line interface

C379S382000

Reexamination Certificate

active

10116728

ABSTRACT:
A method and structure for cutting a ring current when a telephone enters an off-hook state. The method includes: (1) activating an off-hook detected signal when the telephone enters an off-hook state, (2) applying the off-hook detected signal to a selected input terminal of a coder/decoder (CODEC), (3) storing configuration information in the CODEC identifying the selected input terminal and a selected output terminal of the CODEC, (4) activating a ring cut control signal on the selected output terminal in response to the activated off-hook detected signal and the configuration information, and (5) cutting the ring current in response to the activated ring cut control signal. The CODEC includes a control register for storing the configuration information, and a hardware cut ring current (HCRC) circuit, which activates the ring cut control signal on the selected output terminal in response to the activated off-hook detected signal and the configuration information.

REFERENCES:
patent: 6570984 (2003-05-01), Shalev
patent: 6735302 (2004-05-01), Caine et al.
80C186EC/80C188EC Microprocessor User's Manual; Intel Corporation; 1995; pp. 13-1 through 13-12.

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