VIAVI TestCentr: STC 5.36 - B2-800 appliance - FCS and FEC errors in b2b mode using Molex DAC in 400G mode

CRC error packets received by STC without any traffic runnings. This has been seen on B2-800 appliance at 400G mode, tried connecting few STC ports back to back with 1M Molex DAC cable and issue remains.     Some other details: • Tried with different cables and different DUT, the issue remains the same: 400G Spirent receiving CRC errors, with or without Link training enabled. • The same cable, DUT works fine at 800G speed. • Latest working version: 5.35/5.34 • Issue follows the STC port. But sometimes STC port in which CRC error seen in random. • Issue happens Immediately. STC back to back setup, STC reports receiving CRC error even when there is no traffic. • Changing the Advanced options in the port configuration and issue persists    

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