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Versiv Cabling Certification Product Family
Technical Reference Handbook
252
Ghost
(Also known as an
“echo”.)
The event is a copy of
another reflection. It is
caused by light
bouncing back and
forth between
connectors. Page 298
shows OTDR traces with
gainers.
Caused by a dirty or unseated connector, highly-
reflective connector, a connector with an
incorrect polish, a sharp bend, or a crack in a
fiber.
To see where to look for the fault, find the Ghost
Source in the event table. The ghost source is
always before the ghost. The event table does
not show ghosts that occur after the end event.
If the ghost source is a hidden event, the tester
possibly will not identify a ghost event as a
ghost.
The tester does not give a PASS/FAIL status to
this event.
Ghost Source
A reflective event that
causes an ghost.
Caused by a dirty or unseated connector, highly-
reflective connector, a connector with the wrong
polish, a sharp bend, or a crack in a fiber.
On traces with multiple ghosts, the event table
possibly shows only the strongest ghost source.
You can usually see that other reflections are
ghosts because they occur at multiples of
distances to connectors and they show almost no
loss.
Verify that the connector is seated properly.
Inspect connectors that cause ghosts. If a
connector is apparently not the ghost source, use
a visual fault locator to look for bends or cracks
in the fiber near the ghost source.
Table 11. Event Types (continued)