Power over Ethernet (POE) is a kind of technology that allows network cables to also carry electricity in order to power devices.
For many connected devices, like networked surveillance cameras or IP cameras, two connections would normally be needed – an electrical connection, and the actual network connection. The electrical connection provide the device the power it needs to function, and the network connection would allow it to communicate with the network. Obviously, installing both connections can be more pricey and complicated than many people are up for.
However, POE is able to combine the two connections into one ethernet cable – so that single network cable will transmit both data and 25W of electricity. Special cables aren’t required either, as ethernet cables from Category 5 to Category 7a are compatible.
PoE can be used with any device that requires both power and a network connection. Here are the primary areas in which PoE is used:
VoIP phones are the most common use of PoE. With PoE, your telephones have a single connection to a wall socket.
IP cameras rely on PoE. Because the PoE-powered devices can be put at any location with a data cable in and around a building, it’s easy to install or move cameras as necessary.
Wireless networking is significantly enhanced by the use of PoE. Wi-Fi Access
Points and RFID readers are typically PoE compatible. This allows you to install devices away from AC outlets.
You can add PoE to your network pretty easily. Simply connect other network devices to the PoE switch (which is a data network switch). The switch will automatically determine whether the devices are PoE compatible.
Depending on the needs of your business and your network, you can get PoE switches to fit a wide number of applications. Some switches might have a few PoE capable ports. Others can provide up to 48 PoE capable data ports, are rack-mounted, and can be clustered together to support an unlimited number of network devices.
Whenever you are preparing to upgrade or expand your data network infrastructure, consider implementing PoE capable network switches. They may cost a little more up front, but will provide a significant return on investment when deploying PoE compliant network devices.
Learn more details: FAQ: Power over Ethernet (PoE) Power Requirements