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FAQ-An OTU1 Service Is Available Between One NG WDM TMX Board and the LH WDM ETMX Board. In This Case, Perform a Cold Reset on the NG WDM TMX Board. When the TMX Starts Up, the Service Is Available. The LH WDM ETMX Board, However, Reports the OUT_LOM Alarm and the NG WDM TMX Reports the Client_SD Al

Publication Date:  2012-07-25 Views:  39 Downloads:  0
Issue Description
Q:
An OTU1 service is available between one NG WDM TMX board and the LH WDM ETMX board. In this case, perform a cold reset on the NG WDM TMX board. When the TMX starts up, the service is available. The LH WDM ETMX board, however, reports the OUT_LOM alarm and the NG WDM TMX reports the Client_SD alarm. 
 
Alarm Information
Null 
Handling Process
A:
1. The WDM-side ODU1 channels on the TMX and LH TMX boards scramble signals, and the WDM-side ODU1 channel on the LH ETMX board does not scramble signals.
2. The NG_TMX connects to the LH_ETMX on the WDM side. As the WDM-side ODU1 channels of the two boards are different in scrambling mode, the descrambling of the WDM-side ODU1 channel fails, and the ODU1_LOM alarm occurs. To ensure that the interconnection between the NG_TMX board and the LH_ETMX board is successful, the TMX board changes its ODU1 scrambling mode when discovering that the opposite board is an LH board and ODU1_LOM alarms exist in the WDM-side ODU1 channel of the LH board.
3. When the TMX board starts up after the cold reset, the WDM-side ODU1 channel scrambles signals. The WDM-side ODU1 channel of the opposite board (the LH_ETMX board) does not scramble signals. One ODU1 service is scrambled once at the client-side. Then, the ODU1 service returns to the input of port IP3 through the optical fiber and it is descrambled. The descrambling fails and OUT_LOM alarms occur. At the same time, the Client_SD alarm is inserted and the TMX board reports the Client_SD alarm.
4. On the opposite LH_ETMX board, one ODU1 service is input from the WDM-side, output from the client-side, and transported back to the TMX through the WDM-side. In this case, the TMX on the WDM-side successfully scrambles signals and the service is normal. The TMX does not detect the LOM alarm and does not change the scrambling mode. The state persists. 
 
Root Cause
Null 
Suggestions
Null 

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