Fluke DSX-600 CableAnalyzer Troubleshooting Handbook page 12

Using TDR techniques, the DSX-600 can prevent false passes when checking shield
continuity in a data center with common grounds.
See Figure 6. (S = Shield).
The automated link diagnostics save time and costs over trial and error techniques that
usually include the re-terminating of wiring and/or replacing of connecting hardware
in several locations in order to get a failing link to pass. The section on advanced
troubleshooting techniques will show you how you can obtain and interpret the
underlying diagnostic information generated by the tester's analysis algorithms. To find
out more about these diagnostic capabilities let's have a look at the HDTDR and HDTDX
capabilities of the DSX-600.
Advanced troubleshooting diagnostics
The DSX-600 diagnostics discussed above represent a distillation of a more complex
analysis of the test results data. In this section we will go into more detail about the
diagnostic analysis of link failures. Knowledge of the advanced diagnostics techniques
may help you to distinguish cases in which the automated diagnostics fall short. The
basis of the tester's ability to report the distance to a location along the link-under-
test where crosstalk is excessive or where Return Loss is excessive, is the conversion
of the test results data collected in the frequency domain to the time domain. The
DSX-600 executes this conversion using unique and patented digital signal processing
techniques. The data in the time domain is in turn converted to a profile of the measured
disturbance along the length of the link.
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Figure 6
The DSX-600 CableAnalyzer can make
Shield integrity measurements using
TDR techniques that can prevent false
shield test passes.