Single ended line probing in DSL system using combined FDR-TDR approach
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United States of America Patent
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Issued Date -
Aug 7, 2003
app pub date -
Jan 8, 2003
filing date -
May 9, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A Single Ended Line Probing (SELP) technique using combined Frequency Domain Reflectometry (FDR) and Time Domain Reflectometry (TDR) for characterizing a transmission medium (e.g., DSL) is disclosed. FDR is used to detect one or more reflectors (e.g., short, load coil, bridge tap) in the transmission medium. TDR is then used to determine the location of the reflectors in the transmission medium. In one embodiment, a wide band periodic probing signal is used to probe the transmission medium for reflectors. In another embodiment, gauge information can be used to increase the valid range of the combined FDR/TDR SELP technique.
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