If you're OK with 100 mbps point-to-point over a single wire pair, there's stuff like the TJA1100[1]. 10Base-T1 might be a real thing someday. You might just w

If you're OK with 100 mbps point-to-point over a single wire pair, there's stuff like the TJA1100[1]. 10Base-T1 might be a real thing someday. You might just want RS-485. [1] https://www.nxp.com/docs/en/data-sheet/TJA1100.pdf https://www.nxp.com/docs/en/data-sheet/TJA1100.pdf