Versiv Series Cabling Certification Product Family
Technical Reference Handbook
502
Table 20. Causes of OTDR Test Failures (continued)
GPU51.EPS
Top figure: Ghost after the end of the link
These are not listed in the event table and usually do
not indicate a fault in the link.
Bottom figure: Ghost in the middle of the link
Ghosts that occur in the middle of the link are listed
in the event table, along with the source of the
ghost. These can be caused by the following:
A dirty connector
A highly-reflective connector
A UP or UPC connector mated to an APC
connector
A connector that is not seated properly.
A connector that is wet with cleaning solvent.
A poorly-seated connector usually shows a large loss,
as shown in the example. A connector with the
wrong type of polish can also cause large reflections
that cause ghosts.
Ghosts caused by hidden events may not show as
ghosts in the event table.
On traces with multiple ghosts, possibly only the
strongest ghost source shows in the event table. You
can usually determine that other reflections are
ghosts because they occur at multiples of distances to
connectors and they show almost no loss. Multiple
ghosts from the same source are spaced equally
apart.
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