The ONU going online failure is a fault in which an ONU
fails to go online normally, and the queried Run state of the ONU is displayed
as offline by running the display ont info command on the OLT.
Fault Description
Network topology: Optical split level: two levels; level-one
split ratio: 1:2; level-two split ratio: 1:16; backbone fiber: 2.2 km long;
branch fibers: 500 m to 24 km long
During deployment in an office, the receive optical power of
all ONUs under two-level optical splitters is normal but the ONUs fail to go
online.
Alarm Information
None
Possible Cause
l The ONU receive optical power is larger than the overload
optical power.
l The ONU receive optical power is smaller than the
sensitivity.
l There is abnormal attenuation on ODN lines.
l The distance between the ODN Max. receive optical power
and Min. optical power exceeds the threshold.
Procedure
Step 1 Analyze the
network. It is found that the distance between the farthest ONU and the OLT is
over 20 km and the distance between the farthest and nearest ONUs is also over
20 km, as shown in Figure 1.
Step 2 Plan the ODN
again and connect the ONUs whose fibers are longer than 20 km to another PON port.
Then, ONUs normally go online.
Step 3 Such a fault
does not recur in the next week.
----End
Suggestion and Conclusion
Make sure that the distance between the farthest ONU and the
nearest ONU under a PON port is smaller than 20 km.
The similar products MA5683T also works for this solution.
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