Does 200G QSFP-DD to 2xQSFP28 Breakout DAC need FEC enabled on the host?
200G QSFP-DD to 2xQSFP28 Breakout DAC is a passive Twinax assembly with no retimer, so FEC and lane mode are decided entirely by the source and branch QSFP-DD host ports. Confirm the FEC mode the target platform expects before ordering, because a passive cable cannot compensate for a host that assumes a retimed link.