Exfo FTB-7000 OTDR for FTB-200 v2 Manuel d'utilisateur Page 325

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Description of Event Types
OTDR 311
Merged Event
Effect of Event Status in the Global Trace Status
³ A trace status is, by default, set to Unknown.
³ If a trace is set to Fail once, it remains with that status (it cannot be set
back to Pass or Unknown).
³ Whenever an event status is Fail, so is the trace status.
³ If an event status is Pass, the trace status can change from Unknown to
Pass.
³ If an event status is Unknown, the trace status remains the same. In
other words, the event, in this case, has no influence on the trace
status.
To avoid Unknown statuses, do not unselect loss thresholds individually.
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