Telephonic communications – Substation or terminal circuitry
Reexamination Certificate
2005-05-17
2005-05-17
Isen, Forester W. (Department: 2644)
Telephonic communications
Substation or terminal circuitry
C379S387020, C379S399010, C379S398000, C379S402000, C379S093050, C379S093090, C379S412000, C379S413020, C379S413030, C379S413040
Reexamination Certificate
active
06895089
ABSTRACT:
Resistance in parallel with inductors in a series leg of the low-pass filter facilitates changing input and output resistance of the filter with little or no change in the reactance of the inductors. Furthermore, the reactance of the capacitors in the shunt legs of the filter will be substantially unaffected. This assists the designer in matching the impedance of the filter in the pass-band while still providing substantial impedance mismatching in the stop-band without substantially affecting the characteristics of the filter. Facilitating impedance matching in the pass-band and impedance mismatching in the stop-band is accomplished without the need for more complex active components. POTS splitters making use of such filters can facilitate impedance matching of line and load termination in a telecommunications system in response to signals within the frequencies of typical analog telephony service while providing impedance mismatching in response to signals within the frequencies of typical xDSL service.
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ADC DSL Systems Inc.
Fogg and Associates LLC
Isen Forester W.
Powers Jon M.
Singh Ramnandan
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