Diagnosing Copper Cabling Faults
Common Causes of Copper Cabling Failures
6-3
6
Table 6-1. Diagnosing Twisted Pair Test Failures (cont.)
-continued-
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
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