Method and apparatus for filtering asymmetric digital subscriber line (ADSL) signals
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United States of America Patent
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Nov 2, 2004
Grant Date -
N/A
app pub date -
May 12, 1999
filing date -
May 12, 1999
priority date (Note) -
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Abstract
A method and apparatus for selectively filtering signals on a digital subscriber line (DSL) so as to prevent interference resulting from a telephone instrument switching between its on-hook and off-hook states. One embodiment of the invention utilizes an off-hook detector controlling a variable attenuator element. Another embodiment of the invention uses a switch in parallel with a resistive element to implement the variable attenuator element. Yet another embodiment has an inductive element with a saturable core for providing attenuation to compensate for inconsistencies that result from the changing hookswitch status of a telephone instrument.
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