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SCAN-LAN Vt
Common Causes of
Solutions
Attenuation
Impedance
A splice in the segment, or damage to a segment, can
Anomalies
cause excess attenuation.
Perform a length test to check for anomalies in the segment.
If anomaly is detected, go to that point and examine the
cable and connections for kinks, cuts, splices, incorrect
cable, sharp bends, etc. Repair as necessary.
Substandard
It is common to make the mistake of using couplers or
components
lower-grade hardware or cable than the minimum
expected. The highest category your installation will comply
to is that of the lowest-category component in your segment.
The chart below describes some attenuation problems and their possible
solutions.
Test Results
Possible Solutions
Attenuation test
Compare actual to expected values to confirm misconformance.
fails for one or
more pairs
Check that the length is within specification in applications
where attenuation is a maximum limit only. If the cable is too long,
correct as necessary.
If attenuation is based on a per-foot limit, follow the procedure for
“NEXT test fails one or more pairs” to locate the attenuation problem.
Attenuation
Compare actual results to expected results. Values may be
test fails
borderline.
intermittently
Re-terminating a connection could correct the problem.
Follow the procedure for “NEXT test fails for one or more pairs” to
locate the fault.
