We have a 4410n wireless n access point we are using for testing. Have a time getting it to power up with POE and a 3550 switch. I have disabled cpd and spanning tree. Only way to get the AP to power up is remove power from ether port and use DC adaptor for ap. After is have been running, I can remove dc power adaptor. Should this work over the poe and not have to use the dc adaptor?