2-26
IM AQ7280-01EN
How to View Fault Points of Multi Split Routes (OLT->Splitter-
>ONU)
If the route is set to OLT->Splitter->ONU, the number of connected ONUs will be equal to the number
of splits. As such, to determine which route each fault point belongs to, you need to check the events
on the displayed waveform.
Optical splitter
OLT
ONU1
ONU2
ONU3
Fault point
ONU4
ONU1 event
ONU2 event
ONU4 event
Event caused by the fault point
ONU3 event
In the example shown above, reflections from ONU3 are not detected due to a fault point on the ONU3
route. The event of the fault point is detected instead. When an event is detected closer than the actual
ONU3 position, we can assume that there is a fault point on the ONU3 route.
Note
If the route is set to OLT->Splitter->ONU, even if there are breaks, they are not detected because other split
routes are overlapped. The position of the end of the cable will be considered to be the position of the break,
and the distance to that position will be displayed.
In such a case, verify the event position on the displayed waveform with the distance to the installed ONU.
2.4 Performing Averaged Measurement and Measuring the Distances to Breaks