DTX Series CableAnalyzer
Technical Reference Handbook
4-4
Table 4-1. Diagnosing Twisted Pair Test Failures (cont.)
NEXT, PSNEXT, ELFEXT, PSELFEXT gives FAIL, FAIL*, or PASS* result
Note
Fixing NEXT problems usually corrects ELFEXT problems.
• 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
-continued-
To Next Page
Loading...
