As an alternative to DAC I can report that a TP-Link TL-SM410U (2.5gbe SFP+) that I purchased from China via AliExpress for a little over $20 total delivered is working going from Omnia → TL-SM410U → Cat5e → native 2.5gb switch port (QNAP QSW-2104-2S)! Current OS v6.0 reports 2500 gbps connection in web interface & system logs show it with no drama. Green LED on switch indicates 2.5gb speed but I haven’t run iPerf yet. Seems to run cool.
It’s not fiber but at least high grade twisted pair copper can run much farther than Twinax!
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