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The Interfaces of the NE5000E, After Being Upgraded to V200R003, Generate Alarms on Too Low Optical Power Received

Publication Date:  2012-07-27 Views:  177 Downloads:  0

Issue Description

The NE5000E on the current network is upgraded from V200R002C02B590 to V200R003C02B609. After the upgrade, a few interfaces not in use generate alarms on too low optical power received. Before the upgrade, no optical fibers are connected to these interfaces, which are in Down state at both the physical and protocol layers. 

Alarm Information

     <NE5000E>dis alarm all
Index    Level        Date        Time                  Info      
1        Warning      09-04-23    05:33:54    LPU5 is failed, esfp on card 0 
                                              port 3 receive power too low , m
                                              aybe fiber not plugged ! 
2        Warning      09-04-23    04:59:46    LPU12 is failed, esfp on card 1
                                               port 0 receive power too low , 
                                              maybe fiber not plugged ! 
3        Warning      09-04-23    04:59:35    LPU12 is failed, serdes receive
                                               cdr on card 1   abnormal, maybe
                                               fiber not plugged ! 

Handling Process

Shut down the interfaces not in use. After the system implements board status polling, the "receive power too low" alarms are cleared. 

Root Cause

V200R003 of the NE5000E and V300R003 of the NE40E/80E enhance the signal detection function of the optical interface. In addition, the default interface configuration is undo shutdown. Thus, if the board has interfaces not in use, as detected by the software during signal detection, the software generates the "RxPower is too low" alarms. 


1. For NE5000E V200R003 and NE40E/80E V300R003, shut down the interfaces not in use.
2. The system implements polling to determine the Up/Down status of boards. Therefore, after the interfaces not in use are shut down, the alarms are cleared only after status polling.