I use different consumer level PoE switches, Trendnet, Linksys, which have 8 ports, 4 of which provide PoE out.
They should be marked somehow on the front of the switch typically.
On the AP, the R500 has two Eth ports, only one says PoE over it. Be sure you are plugging your cable into the
PoE in Ethernet port on your AP too.