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Setting good valued to the high speed repeater equalizer fix the issue. Nevertheless, it is difficult to guarantee a unique value that will guarantee a working link. However, the default one (0x2F) sounds to be one of the worst we could set according to the statistics we got. Therefore, it is recommended to initialize the repeater with 0x03 and run the scan script to optimize it in case of link issue.

ToDo list

Additional tests that could help getting even better idea of link quality issue:

  •  Try plugging in a couple of different detectors (and different fiber lengths) into a few of the xpm6 ports to get a feeling for how much variation there is in the equalizer settings.  This would address my question of whether a small piece of dust in the wave8 fiber path could be affecting the settings.