Black Box SCAN-LAN VI, Manual

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CHAPTER 8: Testing Twisted-Pair Cable
on one or more of the pairs ” on the next page.
Test Results Possible Solutions
OPEN on one or Perform a length test to locate fault. Go to the fault and correct
more of the pairs the wiring error.
If you cannot locate the fault by the length test, check all ter-
minations at punchdown blocks, patch panels, and wall plates.
If no miswires are found, back up to the next-closest
telecommunication outlet or transition point and test from there.
Continue to the next outlet or transition point until fault the
is isolated. Then reterminate the segment.
If the problem continues, it could be a damaged cable.
SHORT on one or Follow same procedure as for “ OPEN on one or more of the
more of the pairs pairs .”
Remote unit Be sure that the main and remote units are connected to the
not connected same cable.
If the connections are correct, follow same procedure as
searching for “ OPEN on one or more of the pairs .”
Reversed pair Depending on the application, this may be okay.
Double-check the specification you are testing to and
re-terminate the segment if necessary to correct the problem.
If the problem continues, follow the procedure for “ OPEN on
one or more of the pairs ” to locate fault.
Split pair Make note of which pairs are split. Double-check the
requirements (which conductors should be paired) for the
segment under test.