Power over Ethernet (PoE) is an effective method of supplying 48 VDC power to certain types of powered devices (PDs) through Category 5 and above twisted pair Ethernet cables.
PDs include wireless access points, IP telephones, laptop computers, web cameras, and other devices. With PoE, a single Ethernet cable supplies power and the data connection, reducing costs associated with separate power cabling and supply.
In a SummitStack, power is maintained across a failover on all PoE ports of non-primary nodes but is lost on all PoE ports of the failed primary node. Each ExtremeSwitching switch has its own PSU and the power budget for each ExtremeSwitching switch is determined by the internal/external PSUs connected to that ExtremeSwitching switch.
PoE+ supports higher power levels as defined by the IEEE 802.3at standard.
PoE++ supports higher power levels as defined by the IEEE 802.3bt standard.