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Eye Pattern Test on the TQS

Publication Date:  2012-07-25 Views:  41 Downloads:  0
Issue Description
 On an OptiX OSN 6800 NE, a TQS board transmits a signal for which the eye pattern is not like an eye. 
Alarm Information
Null
Handling Process
1. Test a signal transmitted on another TQS with the CSA8000 tester. The eye pattern for the signal is also not like an eye.
2. Test a signal transmitted on a 2.5-Gbit/s SDH analyzer with the CSA8000 tester. The eye pattern for the signal is like an eye.
3. Configure a service between the TQS boards on the NE. Connect the 2.5-Gbits SDH analyzer to one TQS, and the CSA8000 tester to the other TQS. Transmit a signal on the SDH analyzer. The eye pattern for the signal is not like an eye.
4. Perform a loopback on one side of the TQS. Connect the 2.5-Gbit/s SDH analyzer to the other side of the TQS. The SDH analyzer displays the R-LOF alarm. This indicates that the service is unavailable. The problem lies outside the eye pattern test.
5. Test the receiving and transmitting optical powers of the 2.5-Gbit/s SDH analyzer and TQS. It is found that the SDH analyzer and TQS properly transmit and receive optical signals. Query the service type on the TQS. It is found that the service type on the TQS is ODU1.
6. Change the service type on the TQS from ODU1 to STM-16. The R-LOF alarm disappears. The eye pattern for a signal transmitted on the TQS is like an eye. 
 
Root Cause
1. The TQS fails.
2. The TQS transmits an incompliant optical signal.
3. The CSA8000 eye pattern tester fails. 
 
Suggestions
 Unlike an OptiX SDH NE, an OptiX OSN 6800 NE requires manual settings, especially the service type setting. Without the settings, the OptiX OSN 6800 may fail in some tests. On the OptiX OSN 6800, the default service type is ODUK. 

END