Versiv Series Cabling Certification Product Family
Technical Reference Handbook
350
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 502
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, a
connector with solvent on its endface, a
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 14. Event Types in the Event Table (continued)
To Next Page
Loading...
