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SCAN-LAN VI
1. When connecting to unidentified twisted-pair cable, make sure there
are no voltages on the segment. Use a tone tester or voltmeter to
determine that there are no voltages on the wire.
2. Connect the remote unit to one end of the cable. Connect the main
unit to the other end.
8.3.3 S
ELECTING THE
P
ROPER
T
EST
Autotest should be used for all certification testing. Autotest verifies that
all twisted-pair cable parameters meet the requirements of the cable
specification selected. Autotest is also the only test other than Ethernet
Traffic that can be saved for later printing.
The purpose of the Quick Check is to make sure there are no gross errors
before running the longer Autotest. If there is a gross error (for example,
split pair, OPEN, segment too long), you can fix the error before running
the extended certification test, thus saving time.
You cannot use the Quick Check for certification testing because it does
not make all the measurements necessary to ensure EIA/TIA compliance.
The Quick Check was only designed as a quick test.
When testing UTP segments, the EIA/TIA Link Performance standard
requires that you test NEXT from both directions. Because the link is not
end-for-end symmetrical, NEXT will be different on each end. By testing
from both directions, you can make sure no cable faults were missed.
If you suspect that you have a noise problem, check it from both ends
of the cable.
8.3.4 I
NTERPRETING
R
ESULTS
1. When testing a segment with multiple errors, do not try to interpret all
the results. Start with the most obvious problem, correct it, and then
re-run the test. You may see multiple faults go away by correcting one
fault. For example: Your test results show a split pair and that the
characteristic impedance failed. If you correct the split-pair problem
first (because it is the easiest problem to troubleshoot), you may find
that you have also corrected the characteristic-impedance problem.
Summary of Contents for SCAN-LAN VI
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