CENTRAL DISTRICT, Hong Kong -- SmartAX MA5600T/MA5603T Multi-service Access Module Troubleshooting: ONU Frequently Goes Online and Offline: TC-C6214 ONU Frequent Going Online and Offline Because of a Too Large Split Ratio

MA5600T:

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Fault Description

Network topology: Originally, the system uses one-level optical split and the split ratio is 1:8. Later, the customer connects a 1:16 optical splitter to the 1:8 optical splitter. The three ONUs are connected to the 1:16 optical splitter.

During deployment in an office, three ONUs frequently go online and offline.

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.

Procedure

Step 1 Test the ONU receive optical power. It is found that the receive optical power of the three ONUs is approaching the sensitivity.

Step 2 Analyze the total split ratio of the three ONUs. It is found that the total split ratio is 1: (16 x 8) = 1:128, which is too large and therefore causing too large attenuation

Step 3 Change the 1:16 optical splitter to a 1:4 one. Then, the fault is rectified.

Step 4 Such a fault does not recur in the next week.

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