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@whitequark@mastodon.social @0x47df@duckpon.de For PHY compatibility, one should guard both sides with a known-good USB hub IC, not all USB 3 PHYs can handle the distorted LFPS to start a link it seems (VIA can't, Intel can). But the bare-minimum version is literally just two data lines directly into SFP+, with 50 Ω resistors to bypass receiver detection.

And you can sell this circuit board with barely any electronics for $200 as a corporate conference room solution! Don't ask how I knew (I couldn't believe I've spent $200 just to reverse-engineer 1-bit of information). The picture is my own implementation.