18
Event Table is always generated if testing in the Full Auto or End Locate modes, and optional in
the Expert test mode.
1. In the Full Auto and End Locate modes, Events are set to Auto by default.
2. In the Expert test mode, set Events (Events menu) to Auto.
Icon Event Type Description
Start The start of the fiber under test.
Note: Indicates start of the launch cable when a launch cable is
present.
End The end of the fiber under test.
Note: Indicates end of the receive cable when a receive cable is
present.
Reflective Event An event with measurable loss and reflectance, typically caused by a
connection or mechanical splice.
Non-Reflective
Event
An event with measurable loss but very small or unmeasurable
reflectance, typically caused by a splice or bend in the fiber.
Gainer An event with ‘negative loss,’ which can occur in OTDR traces where
two fibers with very different backscatter coefficients are spliced
or connected. Normally a gainer will be seen as a normal (positive
loss) event when tested from the other end of the fiber. The true loss
of the event causing the gainer is the approximately equal to the
average of its loss measured from each end of the fiber under test.
Multiple Event An event table entry that accounts for two or more physical (real)
events that are too close together to be measured separately by the
OTDR, for example the start and end of a short jumper. The loss of
a multiple event is the sum of the losses of the physical events that
comprise it.
Event Table
Event Icons and Types
CABLE000_001
1550
WAVE
No Location
(m)
Type Refl
(dB)
Loss
(dB)
1 xxxx
xxxx xxxx
2 xxxx
xxxx xxxx
1310
ZOOM
dB
i
Event Table displays
events location in user selected
units, event type, reflectance
and loss in (dB).
Trace Graph.
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