Comment by throw0101a

Single-pair wire can deliver power in addition to 10Mbps:

* https://en.wikipedia.org/wiki/Power_over_Ethernet#PoDL

* https://blog.siemon.com/standards/ieee-p802-3cg-10-mbs-singl...

Not sure what kind of distance-dropoff trade-off there is:

> For example, at 55V and 1000m, 7.7W can be delivered to the endpoint. At shorter distances, 55V and 150m, 52W can be delivered to the endpoint.

* https://ethernetalliance.org/wp-content/uploads/2021/07/EA_T...

Eval board here:

* https://www.analog.com/en/products/adin1100.html#product-eva...

All of this is meant for bulk purchases in the industrial/embedded/automation/SCADA space, so small-batch hobbyist purchases may be expensive.