EXFO OTDR 2 - Manual (Page 138)

Analyzing Traces and Events
130 OTDR
Inserting Events
3. Once you have determined the location, from the Type list, select the
desired event type.
4. From the Spans list, select the desired span type.
5. If necessary, enter a comment in the box.
6. Tap Insert to insert the event or Cancel to return to the measure tab
without making any changes.
Inserted events are marked with asterisks (appearing beside the event
number).