EXFO FastReporter Data Post-Processing Software - Manual (Page 211)

Data Post-Processing Software 205
A Description of OTDR Event
Types
This section describes all types of events that may appear on the graphic
generated by the application. Here is a guide to the descriptions:
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Each type of event has its own symbol.
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Each type of event is represented by a graph of a fiber trace, which
illustrates the power reflected back toward the source as a function of
distance.
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An arrow points to the location of the event type in the trace.
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Most graphs show one complete trace; that is, an entire range.
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Some graphs show only a portion of the entire range to view events of
interest more closely.