When total power consumption excels 55W, the intelligent power management will cut the lower priority port power off to ensure the high priority port’s power supply and protect the device from power overload operation. 4 of the 5 Auto-Negotiation RJ45 ports (Port 1 to Port 4) of the switch support Power over Ethernet (PoE) function. These PoE ports can automatically detect and supply power with those IEEE 802.3af compliant Powered Devices (PDs).