EXFO iOLM - Manual (Page 126)

Managing Results
120 iOLM
Link View
Global Pass/Fail Status
The global pass/fail status depends on the pass/fail status of the link length,
link loss, link ORL, power meter values (if taken), and the link elements.
If any of the status is fail, then the global pass/fail status will be fail.
The status is automatically updated when a value is modified in the
application. When the element type is changed from the Elements tab, the
individual pass/fail status is recalculated, which might affect the global
pass/fail status.
The iOLM application waits for the acquisition to finish before displaying
the Pass status. However, the Fail status is displayed as soon as any of the
values tested has a Fail status. A fail value can change to unknown or pass
when the acquisition is finished.
Note: It is important to complete the entire acquisition process to have a good
pass/fail status.
The global pass/fail status of the iOLM measurement is displayed as
unknown, if there is no failed value and one element is not tested because
it follows the 2:N splitter on the link.
In loopback mode, when the measurement is split (link 1 and link 2), the
global pass/fail status is replaced by the link 1 and link 2 statuses.