@Frogman 

Hi, for your issue, please take the below answer.

'Newbie question - Can I use a PoE socket for a non-PoE device?'

Generally speaking, PoE socket can provide data and power for the PoE device at the same time.

But if you connect a non-PoE device to the PoE socket, it can't provide data and power at the same time. It will be used as normal Ethernet port which can only provides data for this non-PoE device. You also need to provide power for the non-PoE device.

Wish it can help you!

Good day!

@Kathy_Z  That Means Non PoE Support Device need PoE Slither.