DTX Series CableAnalyzer
Technical Reference Handbook
6-4
Table 6-1. Diagnosing Twisted Pair Test Failures (cont.)
NEXT, PSNEXT, ELFEXT, PSELFEXT gives FAIL, FAIL*, or PASS* result
•
Excessive untwisting of pairs at connector
•
Poor quality patch cords
•
Poor quality connectors
•
Poor quality cable
•
Poorly matched plug and jack (Cat 6/Class E applications)
•
Incorrect link interface adapter
•
Cable compression (tight cable ties, pinches, kinks, etc.)
•
Inappropriate use of couplers
•
Excessive noise source near cabling under test. Use the
impulse noise test to check for noise.
•
Wrong test standard selected
Note
Fixing NEXT problems usually corrects ELFEXT
problems.
Tip: The HDTDX test in Single Test mode features a scanning
function that runs the HDTDX test continuously. This
function can be helpful for locating crosstalk faults
caused by cable compression and noise sources. See
page 6-9.
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