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US 2013/0170629 A1Published application
Non-invasive diagnostic transmission line testing
AssigneeAdaptive Spectrum and Signal Alignment, Inc.
InventorsMark B. Flowers, Mark H. Brady, Marc H. Goldburg, Mark P. Mallory, Ardavan Maleki Tehrani
Life of this patent
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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.
Claims30
A method comprising:
- receiving a probing signal reflected on a twisted pair telephone line at a DSL device;
- removing an estimate of one of a DSL data transmission signal or DSL synch symbol transmission signal from the received probing signal to recover the reflected probing signal;
- and
- processing the recovered reflected probing signal to determine characteristics information of the twisted pair telephone line.
1 more element
A DSL device comprising:
- an interface coupled to a twisted pair telephone line to receive a probing signal reflected on the line;
- logic coupled to the interface to remove an estimate of one of a DSL data transmission signal or DSL synch symbol transmission signal from the received probing signal to recover the reflected probing signal;
- and
- processing logic coupled to the logic to process the recovered reflected probing signal to determine characteristics information of the twisted pair telephone line.
1 more element
A method comprising:
- receiving a signal reflected on a twisted pair telephone line at a DSL device;
- estimating a reflected probing signal in the received reflected signal, using an adaptive filter;
- removing the estimated reflected probing signal from the received reflected signal;
- and
- processing the adaptive filter to determine characteristics information of the twisted pair telephone line.
2 more elements
A DSL device comprising:
- an output to transmit a probe signal;
- an input to receive a signal reflected on a twisted pair telephone line at a DSL device;
- adaptive filter logic coupled to the input and output to estimate a reflected probing signal in the received reflected signal based on the transmitted probe signal;
- and
- adaptive filter cancellation logic to remove the estimated reflected probing signal from the received reflected signal, the adaptive filter further to determine characteristics information of the twisted pair telephone line.
2 more elements
Dependencies are inferred from the claim text.