- Power over Ethernet(PoE) describes any of several standardized or ad-hoc systems which pass electric power along with data on twisted pair Ethernet cabling. This allows a single cable to provide both data connection and electric power to devices such as wireless access points and IP cameras.
- Power sourcing equipment (PSE) is a device such as a network Switch that provides (or sources) power on the Ethernet cable. The maximum allowed continuous output power per cable in IEEE 802.3af is 15.40 W. A later specification, IEEE 802.3at, offers 25.50 W.
- A powered device (PD) is a device powered by a PSE and thus consumes energy. Examples include wireless access points, IP Phones, and IP Cameras.
Only device models marked with P, PX, PXE, NPE, PE or EP support PoE.
Here is a typical topology for PoE. The PDs are power devices connected to a PoE switch.
Figure. Power devices(PD) connect with PoE switch
Enabling PoE on all ports is mandatory for other commands.
For more details, please refer to PoE Configuration Commands.