SmartAX MA5600T/MA5603T Multi-service Access Module Troubleshooting: ONU Frequently Goes Online and Offline:
The ONU frequently going online and offline failure is a fault in which an ONU connected to aPON port of an OLT frequently goes online and offline and therefore the OLT reports a large number of ONU LOS and ONU signal recovery alarms.
There are several reasons if the ONU frequently goes online and offline, we will tell the detailed on this blog.
1 TC-C6007 An ONU Goes Online and Offline Repeatedly Because of
Unstable Voltage
This topic describes how to troubleshoot the fault when an ONU goes online and offline
repeatedly and alarms that the ONU goes online and offline repeatedly are generated on the OLT because of unstable voltage.
Fault Description
An ONU connected to an OLT in an office goes online and offline repeatedly and irregularly.
Alarm Information
Alarms that the ONU goes online and offline repeatedly are generated on the OLT.
Cause Analysis
l The optical fiber attenuation is very large.
l The hardware of the ONU is faulty.
l The boards on the OLT are faulty.
Procedure
Step 1 Other ONUs connected to the PON port are normal, which indicates that the PON board of the OLT is normal.
Step 2 Use an optical power meter to test the optical fiber attenuation on the ONU side. It is found that the optical fiber attenuation is -20 dB, which is normal. This indicates that the line is normal.
Step 3 Replace the ONU with another ONU. The fault, however, persists, which indicates that the hardware of the ONU is normal.
Step 4 The ONU on which the fault occurs is located in a remote mountain area. Therefore, it is suspected that the fault is caused by the surroundings. Log in to the ONU in the telnet mode, and then run the display alarm list all command to carefully view the alarms. It is found that the ONU resets in peak hours from 7:00 a.m. to 8:00 p.m. in four consecutive days. Therefore, it can be preliminarily determined that the fault is caused by the voltage.
Step 5 Use a multimeter to test the voltage on site. It is found that the ONU resets repeatedly due to unstable voltage. Replace the ONU with another ONU with the DC module. As a result, the fault is rectified.
—-End
Suggestion and Conclusion
The ONUs of Huawei support AC power supply and DC power supply. If an ONU uses the AC power supply, the ONU resets repeatedly when the voltage is unstable. If the voltage is abnormal and the normal voltage cannot be guaranteed, it is recommended that you use an ONU with the DC module.
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