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 a PON 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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