Diagnosing Twisted Pair Cabling Faults
Common Causes of Twisted Pair Test Failures 4
4-3
Table 4-1. Diagnosing Twisted Pair Test Failures (cont.)
Wire Map: crossed wires
• Wires connected to wrong pins at connector or punchdown block.
• Mix of 568A and 568B wiring standards (12 and 36 crossed).
• Crossover cables used where not needed (12 and 36 crossed).
Wire Map: short
• Damaged connector
• Damaged cable
• Conductive material stuck between pins at connector.
• Improper connector termination
• Wrong application for cable
“Bad patch cord” message appears (indicates excessive crosstalk over the first 2 m of the cabling)
• Poor quality patch cord used for channel
• Cable on permanent link interface adapter is badly distorted or damaged
• Wrong test standard selected
-continued-
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