Fluke Networks CertiFiber Pro Users Manual - Manual (Page 156)

Versiv Cabling Certification Product Family
Technical Reference Handbook
134
Return loss gives FAIL, FAIL*, or PASS* result (continued)
 Cable compression (tight cable ties, pinches, kinks, etc.)
 Poorly matched plug and jack (6A/Class E
A
applications)
 Wrong test standard selected
 Defective link interface adapter
Note
The HDTDR analyzer can help you locate the cause of
a return loss failure. See page 143.
NEXT, PS NEXT, ACR-N, PS ACR-N, ACR-F, PS ACR-F gives 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
A
applications)
 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
Note
The HDTDX analyzer can help you locate the cause of
a NEXT failure. See page 135.
Correcting NEXT problems usually corrects ACR-F
problems.
Table 7. Causes of Twisted Pair Test Failures (continued)