Diagnosing Twisted Pair Cabling Faults
Common Causes of Twisted Pair Test Failures 4
4-7
Table 4-1. Diagnosing Twisted Pair Test Failures (cont.)
Characteristic impedance exceeds the limit or an anomaly is detected
• Bad connection
• Cable compression (tight cable ties, pinches, kinks, etc.)
• Mismatch of cable types
• Excessive loading at coaxial cable tap
• Incorrect terminator value (coaxial cable)
Resistance gives FAIL, FAIL*, or PASS* result
• Cabling is too long
• Bad connection due to oxidized or loose contacts
• Wire gauge is too thin
• Wrong patch cord type used
Length gives FAIL result
• Cable is too long (may need to remove coiled service loops)
• NVP is set incorrectly
-continued-
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