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Which FEC settings do you use on both ends? FN-TRAN-QSFP28-BIDI requires FEC offQSFP-40/100-SRBD requires FEC offQSFP-100G-SR1.2 requires rs-fecSo QSFP-100G-SR1.2 and FN-TRAN-QSFP28-BIDI will most probably not work together