LANcat
User Manual
Page 7-32
RESISTANCE
Resistance is defined as an electrical element that impedes the flow
of DC current. It is measured in ohms. As a test, it is used to
confirm there are no poor connections that add to the resistance of
the segment. Also, if the resistance is not within the specification,
the problem may also show up as excessive attenuation and/or as
an impedance anomaly.
Although the LANcat uses TDR to measure length, Resistance can
also be used as a method to measure the length of a cable if you
know the rated resistance (ohm per foot or meter) of the cable.
Resistance of a cable is usually rated on a per 1000 feet or 1 km
basis.
The following table discusses some common resistance problems
and solutions.
Test Results
Possible Solutions
Resistance is
out of
specification
Compare measured value with expected
value. Troubleshooting resistance should be
performed similar to that of Attenuation.
See section on Attenuation.
All termination points should be checked.
Perform a Length test to check for
anomalies.
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