EXFO OTDR 2 - Manual (Page 120)

Analyzing Traces and Events
112 OTDR
Viewing Span Start and Span End in Events Table
Viewing Span Start and Span End in Events
Table
When applicable, the application will include the losses caused by the
span start and span end events to the span ORL and span loss values. For
more information, see Excluding and Including Span Start and Span End on
page 28.
If you activated the pass/fail test (see Setting Pass/Fail Thresholds on
page 39), span-start and span-end events will be taken into account when
determining the status (pass/fail) of splice and connector loss and
reflectance.