High Definition Time Domain Crosstalk (HDTDX) is used to troubleshoot links that fail Near-End-Crosstalk (NEXT). Measurements for certification are made in the frequency domain (MHz). However, for diagnostic purposes, this is of little use. We need to be able to see where the crosstalk is happening, so the failing link can be fixed / replaced. This is where time domain data comes into play. Time Domain Reflectometry is the analysis of a conductor (wire, cable, or fiber optic) by sending a pulsed signal into the conductor, and then examining the reflection of that pulse. Hence frequency domain is in Hz, time domain is in meters (ft). Using a time domain measurement will allow us to see the sources of crosstalk and troubleshoot the links. HDTDX is a very good example of a time domain measurement.
Posted on: Sun, 01 Dec 2013 17:23:03 +0000
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