Inventors:
Mark B. Flowers - Los Gatos CA, US
Mark H. Brady - San Ramon CA, US
Marc H. Goldburg - Redwood City CA, US
Mark P. Mallory - Mukilteo WA, US
Ardavan Maleki Tehrani - Menlo Park CA, US
Assignee:
Adaptive Spectrum and Signal Alignment, Inc. - Redwood City CA
International Classification:
H04M 3/28
Abstract:
A probing signal transmitted on a twisted pair telephone line in a DSL system is reflected and received at a DSL device. An estimate of one of a DSL data transmission signal or DSL synch symbol transmission signal is removed from the received probing signal to recover the reflected probing signal. The recovered reflected probing signal is processed to determine characteristics information of the twisted pair telephone line.