Chapter 7
Cable Testing Fundamentals
7-19
Attenuation Errors
Attenuation causes a loss of signal strength over a cable. The loss increases with
cable length, signal frequency, and temperature. Attenuation testing can be used to
find problems in the cable, connectors, or connecting hardware. The larger the
number, the greater the attenuation.
Troubleshooting Attenuation Problems
Problem: High Attenuation Reading
Probable Causes Poor connector termination points.
Excessive cable length.
Incorrect or poor quality adapter cable.
Incorrect cable.
Other Tests Affected Test Possible Result
DC Loop Resistance May be high.
Capacitance May be high.
Length May be over limit.
NEXT May be low on pair combinations.
Average Impedance May be low.
Return Loss May be over limit.
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