EXFO OTDR 2 - Manual (Page 134)

Analyzing Traces and Events
126 OTDR
Modifying Events
3. Position marker A on the event, and submarker a (to the left of
marker A) as far as possible from marker A , without including the
preceding event.
The area between markers A and a must not include any significant
variation. For more information on positioning markers, see Using
Markers on page 83.
4. Position marker B after the end of the event, where the trace returns to
a regular loss inside the fiber, and submarker b (to the right of
marker B), as far as possible from marker B, without including the
following event.
The area between markers B and b must not include any significant
variation. For more information on positioning markers, see Using
Markers on page 83.
Event loss and reflectance are displayed, respectively, in the Loss and
Reflectance boxes.
Marker A Marker B