Power over Ethernet
Power over Ethernet (PoE) is a networking technology that allows electrical power to be transmitted over standard Ethernet cables alongside data, eliminating the need for separate power cables. It enables devices like IP cameras, wireless access points, and VoIP phones to receive both power and network connectivity through a single cable. PoE is standardized by the IEEE 802.3af, 802.3at, and 802.3bt specifications, which define power delivery levels and safety mechanisms.
Developers should learn PoE when designing or deploying networked devices that require both power and data connectivity, such as in IoT systems, security installations, or office networks. It simplifies installation by reducing cable clutter, lowers costs by eliminating the need for electrical outlets near devices, and enhances flexibility in device placement. PoE is particularly useful for powering devices in hard-to-reach locations or where AC power is unavailable.