Operation Manual

DTX Series CableAnalyzer
Technical Reference Handbook
6-6
Table 6-1. Diagnosing Twisted Pair Test Failures (cont.)
NEXT, PS NEXT, ACR-F, PS ACR-F 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 (6A/Class E
A
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
Tip: The HD
TDX 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 6-7.
Impulse noise is detected
• Electrical devices near the cabling are generating noise pulses.
• There is an active link in the same bundle as the cabling under test.
• Verify that the tester and smart remote are operating correctly. Connect the units together and run an Autotest.
Note
Fixing NEXT problems usually corrects ACR-F
problems.