I bought this injector to connect a TP-Link EAP-235 access point to the network, but it doesn't work. Is it supposed to be compatible? I connected the LAN side of the injector to my network with a CAT5E cable and the access point on the WAN side with a CAT7 cable (to the POE socket of the access point). The access point works (with this cable) on a POE switch.