Power over Ethernet (PoE) is a technology for local area networks with Ethernet cable (LAN) that allows electrical power required for the operation of each device to be carried by the data cables rather than power cables . This reduces the number of child to be threaded for the installation of the network.

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PoE means Power over Ethernet, when you seen the device has IEEE 802.3af stanards, it means the device support PoE function. Like the Cisco Switch has PoE function below:

http://www.router-switch.com/tag/poe+switch/