TC-C6212 ONU Failure to Go Online Because of Incorrect Fiber
Connection. This topic describes how to troubleshoot the fault of ONU
registration failure.
Fault Description
Network topology: Optical split level: one level; split
ratio: 1:16; backbone fiber: 3.2 km long; branch fiber: 600 m long
During deployment in an office, an ONU fails to register
with the OLT. The ONU receive optical power is 1.27 dBm and its transmit
optical power is -15.9 dBm. The fault persists after system restart or soft
system reset.
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 fiber is incorrectly connected.
Procedure
Step 1 Test the ONU
receive optical power. The ONU receive optical power is -15.9 dBm, which is within
the normal range.
Step 2 Perform a
remote query. It is found that the ONU should be connected to another PON port.
Then, it is determined that the optical fiber is incorrectly
connected.
Step 3 Confirm the
connection on site. It is found that the optical fiber is incorrectly connected,
as shown in Figure 7-2.
Figure 1 Fiber connection
Step 4 After the fault
is rectified, services recover.
Step 5 Such a fault
does not recur in the next week.
----End
Suggestion and Conclusion
Identify different ports using labels in engineering and
manage the ports differently to prevent incorrect connection.
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