Chapter 7
Cable Testing Fundamentals
7-17
NEXT and ELFEXT Errors
Crosstalk is usually caused by poor connector termination on the ends of the cable.
The smaller the number, the greater the crosstalk.
Troubleshooting NEXT and ELFEXT Problems
Problem: Low dB test readings
Probable Causes Installed cable or patch cable not correctly rated.
Defective, poor quality cable or too many connectors.
Poor quality installation at the connection points.
Too much insulation has been stripped from the wires at
termination.
A pair of wires has been untwisted too much at termination.
Split-pairs.
Poor quality connectors or connectors not rated to desired
category.
Delay skew (ELFEXT).
Other Tests Affected Test Possible Result
Return Loss May be over limit.
NEXT May show same symptoms.
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