Chapter 7
Cable Testing Fundamentals
7-7
• Any combination of up to three opens, shorts, or cross-connections will be
correctly identified.
• Opens and shorts will provide an indication of the cable end that the error
occurred on (provided by Length screen results in Autotest.).
• Split pairs will be identified based on specific patterns of inconsistent NEXT
(Near-End Crosstalk).
Troubleshooting Wiremap Problems
Problem: One or more open pins
Probable Causes Connector-to-wire punch down not mated
Defective jack or plug.
Broken wire(s).
Other Tests Affected Test Possible Result
DC Resistance Fail.
Attenuation Fail.
NEXT Some false measurements.
Mutual Capacitance 0 reading possible.
Length May be low if the open is near the
Display Handset.
Problem: Shorted pins
Probable Causes Conductors making contact at a connector.
Jack or plug has pin or circuit defect.
Cable damaged.
Other Tests Affected Test Possible Result
DC Resistance Low or zero.
Attenuation Fail.
NEXT Some false measurements.
Capacitance Over limit.
Length Reduced or shorted pairs.
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