EXFO OTDR 2 - Manual (Page 38)

Preparing Your OTDR for a Test
30 OTDR
Setting the Analysis Detection Thresholds
Setting the Analysis Detection Thresholds
To optimize event detection, you can set the following analysis detection
thresholds:

Splice loss threshold: To display or hide small non-reflective events.

Reflectance threshold: To hide false reflective events generated by
noise, transform non-harmful reflective events into loss events, or
detect reflective events that could be harmful to network and other
fiber-optic equipment.

End-of-fiber threshold: To stop the analysis as soon as an important
event loss occurs; for example, an event that could compromise signal
transmission toward the end of a network.
When the end of fiber detection threshold is modified for an existing
measurement, the span end position at the new end of fiber position
can be automatically reset by the application.
Note: Changing detection thresholds on the current trace leads to a reanalysis. All
manual changes made will be lost.
Setting the thresholds allow you either to ignore events with known lower
values, or to ensure that all events are detected—even the ones for which
very small values are measured.
I
MPORTANT
The end-of-fiber (EoF) threshold that you define will be used if you
let the application evaluate the acquisition settings.
If you set this threshold, an EoF event will be inserted at the first
event for which the loss crosses the threshold. The application then
uses this EoF event to determine the acquisition settings.