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Spirent KB Article
Doc ID: KNI17179
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Spirent 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
DAC cable: Molex 1.0M 30AWG, P/N 2111661010
Bug. Corrected and validated in STC 5.37.
Product : Windows GUI