Also, you can confirm that by checking the 3CNJ2000 Power LED.
PoE Power LED: On — The unit is receiving power via PoE from the network.
- Green - Power is supplied via 802.3at
- Amber - Power is supplied via 802.3af
The "bypass" option already mentioned by David would be a good option to try, but it's available on EXOS 16.1 and not in EXOS 15.6.3.1.