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on the flip side, USBC does all 3, so the future is already here!

RPi4 should support power and network through its usbc plug, however you'll still need another cable for video currently.

the frame.work "SBC" would allow all 3 through the same connector, but, you'll be looking at ~400+ per SBC just to achieve this, but the key thing is, its 100% doable if you get the hardware combination right

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The RPi might not quite manage it, but any USB-C Mac and many Windows machines can. Maybe. Just make sure you know whether you're expecting to use Thunderbolt over USB-C or USB-C alt modes, and make sure you're within the power budget of a PoE -> USB-PD adapter. And I suspect you'll need to fudge the monitor power supply somehow too.

The different bits will locally need a number of wires to join them together, but you might manage to run the whole thing off a single ethernet cable.

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