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FAQ-How Does the N2000 BMS V200R011C03B036 Differentiate Between Fiber Cut Alarms and Power-Off Alarms of the MxU

Publication Date:  2012-07-25 Views:  12 Downloads:  0
Issue Description
 Q:
How does the N2000 BMS V200R011C03b036 differentiate between fiber cut alarms and power-off alarms of the EPON MxU? 
       
Alarm Information
Null
Handling Process
A:
The N2000 BMS V200R011C03B036 does not directly display the fiber cut alarms and power-off alarms of the EPON MxU so that the alarms are consistent with the alarms generated on the OLT. There are following three cases:
The following analysis can facilitate the differentiation between these two alarms. If the LOS alarm exists in the current alarms, it indicates that the backbone fiber is cut. If the ONU fault alarm exists but the LOS alarm does not exist, it indicates that the MxU is powered off. If the following alarms and event exist, it indicates that the branch fiber is cut:
The alarm of communication failure (this alarm exists in all these three cases) between the device and the N2000 BMS exists.
The ONU fault alarm and LOS alarm do not exist.
The ONU is offline.

Details are as follows:

The MxU is powered off:
The ONU is offline (event).
The ONU is faulty (alarm; you can right-click the alarm to locate to the corresponding ONU).
The communication between the device and the N2000 BMS fails (alarm, which is generated on the N2000 BMS).

The backbone fiber is cut:
The PON port status changes to LOS (alarm).
The ONU is offline (event).
The communication between the device and the N2000 BMS fails (alarm, which is generated on the N2000 BMS).

The branch fiber is cut:
The ONU is offline (event).
The communication between the device and the N2000 BMS fails (alarm, which is generated on the N2000 BMS). 
 
Root Cause
Null
Suggestions
Null

END