DSX-600 CableAnalyzer
Technical Reference Handbook
Table 7. Causes of Twisted Pair Test Failures (continued)
Return loss gives a FAIL, FAIL*, or PASS* result (continued)
Mismatches in cable construction (such as cable from different
manufacturers)
Water in the cable jacket (typically causes failures on all pairs at lower
frequencies)
Cable compression (tight cable ties, pinches, kinks, etc.)
Poorly matched plug and jack (6A/Class E
Wrong test standard selected
Defective link interface adapter
The HDTDR analyzer can help you locate the cause of
a return loss failure. See page 137.
NEXT, PS NEXT, ACR-N, PS ACR-N, ACR-F, PS ACR-F gives a FAIL, FAIL*, or
PASS* result
Excessive untwisting of pairs at a connector
Poor quality patch cords
Poor quality connectors
Poor quality cable
Poorly matched plug and jack (6A/Class E
Incorrect link interface adapter
Cable compression that distorts the pattern of twists in the pairs (tight
cable ties, pinches, kinks, etc.)
Inappropriate use of couplers
Excessive noise source near cabling under test
Wrong test standard selected
The HDTDX analyzer can help you locate the cause of
a NEXT failure. See page 127.
Correcting NEXT problems usually corrects ACR-F
problems.
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