EXFO FTB-7000 OTDR for FTB-200 v2 - Manual (Page 320)

Description of Event Types
306 FTB-7000 Series
Merged Event
Merged Event
This symbol denotes an event combined with one or more other events. It
also indicates the total loss produced by the merged events following it in
the events table.
³
A Merged Event is composed of subevents. Only the Merged Event is
displayed in the events table, not the subevents composing it.
³
Reflective events may indicate the presence of connectors, mechanical
splices, or poor-quality fusion splices or cracks.
³
Non-reflective events may indicate the presence of splices, splitters or
bendings.
³
A reflectance value is specified for all merged events and indicates the
maximum reflectance for the merged event. A reflectance value is also
displayed for each reflective subevent composing the Merged Event.
Reflective events
Point A
Point B
Merged Reflective event position
Total loss (
Δ
dB)
Reflected power
(dB)
Distance
(km)