The Managed PoE switch arrived here today.

One early discovery: If I plug the AP into its local/passive PoE injector, and then connect that to a PoE port on the switch, the switch isn't happy. It just sits powering the port on/off.

So the passive PoE injector doesn't conform to the 25Kohm resistor spec. Most likely it doesn't use a transformer to isolate the AP connection from the LAN input, so the switch (LAN input) still sees the 25Kohm resistor of the AP and attempts to apply PoE to it.

So we will need a PoE splitter at the far-end if there's not enough PoE over the >200m link to run the AP. By adding a PoE splitter, we should then be able to use the local/passive injector at the far-end.

Rather than ordering a splitter in advance, and having to return it later, I think I'll hold off. We can always emulate one by inserting a non-PoE switch at the far end. There are a number of those (100mbit only) on hand already.