EXFO OTDR 2 - Manual (Page 102)

Analyzing Traces and Events
94 OTDR
Graph
Graph
The events, that are detailed in the events table (see Events Tab on
page 99), are marked by numbers along the displayed trace.
Some items in the trace display are always visible, while others will appear
only if you choose to display them.
The green rectangle on the Y axis (relative powers) indicates the proper
injection level range for the defined test pulse.
Note: For multimode measurement, the location of the injection level depends on
the type of fiber that you select.
Default
injection
level
Event no. 4
Events table
Distance
units