EXFO FastReporter Data Post-Processing Software - Manual (Page 50)

Working with OTDR Files
44 FastReporter
Changing OTDR Settings
Setting Event Matching Tolerances
The OTDR Event Table is built by matching events from selected
measurements according to the tolerance. To be matched, the distance
between events from the different measurements must be within the
tolerance.
You can force the matching of two events or separate them by changing
the event matching tolerance accordingly. The tolerance is applied to all
operations related to the event table including apply reference as template,
macrobends, and bidirectional tools.
Although you can set the event matching tolerance to as little as 20 meters
for each pulse width, the results may differ due to cursor aliasing. Cursor
aliasing checks if markers A and B for two events overlap. These markers
are set during analysis. Marker A represents the beginning of a measured
event while marker B represents its end.
Tolerance Tolerance