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The LSX Board That Accesses 10GE LAN Service Reports the OTU_LOF Alarm due to Inconsistent Settings of the Client-Side Mode

Publication Date:  2012-07-25 Views:  42 Downloads:  0
Issue Description
The LSX board is used to access 10GE LAN service in an OptiX OSN 6800 project. The received optical power is normal, but the WDM side of the LSX board reports the OTU_LOF alarm and services are interrupted. 
Alarm Information
Null
Handling Process
Query the client-side settings of the LSX boards on the T2000. The mapping mode is set to Bit Transparent Mapping (11.1G) for the LSX board at the receive end but it is set to Bit Transparent Mapping (10.7G) for the LSX board at the transmit end. The mapping mode conflict triggers the OTU_LOF alarm. Change the mapping mode settings on the T2000, that is, change the mapping mode to Bit Transparent Mapping (10.7G) for both LSX boards. The alarm clears and services are restored. 
Root Cause
When the LSX board is used to access 10GE LAN service, the client-side may use one of the following optional mapping modes:
1. Bit Transparent Mapping (11.1G) (OTU2v signal)
2. Bit Transparent Mapping (10.7G) (OTU2 signal)
3. MAC Transparent Mapping (10.7G)
The TN12LSX board does not support the third mode. When the TN12LSX board accesses 10GE LAN services, the client side can use only one of the following two mapping modes:
1. Bit Transparent Mapping (11.1G)
2. Bit Transparent Mapping (10.7G)
If the mapping mode set on the OTU at the receive end is inconsistent with that at the transmit end, services are interrupted. 
 
Suggestions
When using LSX boards to access 10GE LAN services, make sure that the client-side mapping mode is the same for the LSX boards at both ends. Otherwise, services are interrupted.
When the mapping mode of one TN11LSX board is set to mode 1 but that of the other TN11LSX board is set to mode 2 or mode 3 (different rates), the OTU_LOF alarm is reported. When the mapping mode of one TN11LSX board is set to mode 2 but that of the other TN11LSX board is set to mode 3 (the same rate), the BEFFEC_EXC alarm is reported. 
 

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