EXFO FTB-7000 OTDR Series for FTB-500 - Manual (Page 175)

Analyzing Traces and Events
OTDR 161
Changing the Loss and Reflectance of Events
5. If you selected a reflective event, you can modify the echo status using
the Event Type button.
6. Press the button corresponding to the desired event type.
Loss and reflectance are calculated automatically, based on the
position of the markers.
7. Press OK to accept the modifications you have made or Cancel to
return to the events table without saving the changes.
The modified events are identified with “*” (appearing beside the event
symbol) in the events table as shown below.