Telephonic communications – Subscriber line or transmission line interface
Reexamination Certificate
2007-07-03
2007-07-03
Harold, Jefferey (Department: 2614)
Telephonic communications
Subscriber line or transmission line interface
C379S413010, C379S418000
Reexamination Certificate
active
09753343
ABSTRACT:
A method and apparatus is provided. The method includes transmitting a signal having an AC component to a subscriber line and receiving at least a portion of the transmitted signal from the subscriber line. The method includes determining at least a portion of a period of the AC component of the received signal, and performing a function of a line card in response to determining at least the portion of the period of the AC component. The apparatus includes circuitry that is capable of transmitting a signal having at least one of an AC component and a DC component to a subscriber line, and receiving at least a portion of the transmitted signal from the subscriber line. The apparatus includes a filter and computation logic. The filter is capable of filtering the DC component from the received signal. The computation logic is capable of determining a value proportional to a power of the AC component of the received signal over at least a portion of a period of the AC component. The apparatus further includes logic capable of performing a function of a line card in response to determining the value proportional to the power of the AC component.
REFERENCES:
patent: 5406623 (1995-04-01), Rovik
patent: 5583934 (1996-12-01), Zhou
patent: 6219417 (2001-04-01), Zhou
patent: 6553443 (2003-04-01), Baqai et al.
patent: 6590973 (2003-07-01), Bijman et al.
Harold Jefferey
Legerity Inc.
Williams Morgan & Amerson P.C.
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