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Event Table Page Features
Event Table is always generated if testing in the FTTx - In Service or FTTx - PON Construction test mode
and optionally generated if testing in the Full Auto or Expert test mode.
1. In the FTTx - In Service and FTTx - PON Construction modes, [Events] are set to [Auto] by default.
2. In the Full Auto and Expert modes, set Events to [Auto].
Event Types
Icon
Event Type
Description
Start
The start of the fiber under test.
End
The end of the fiber under test.
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 fusion splice, PON splitter, or sharp
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 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 displays:
event location in user selected units, event
type, reflectance and loss in (dB), and loss/
distance (dB/km)
Trace Graph
For multi-wavelength tests, press to toggle
active trace