Power over Ethernet (PoE) is a networking feature defined by the IEEE 802.3af and 802.3at standards. PoE lets Ethernet cables supply power to network devices over the existing data connection.
PoE-capable devices can be power sourcing equipment (PSE), powered devices (PDs), or sometimes both. The device that transmits power is a PSE, while the device that is powered is a PD. Most PSEs are either network switches or PoE injectors intended for use with non-PoE switches. Common examples of PDs include VoIP phones, wireless access points, and IP cameras.
The main advantage of Power over Ethernet (PoE) is the delivery of data AND power over one Cat5e/Cat6 Ethernet cable. PoE ends the need for AC/DC power supplies and outlets. A remote installation costs less than fiber as no electrician is required. Ethernet cable costs less and is often already installed buildings.
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