TL/DR: PoE (Power over Ethernet) delivers both power and data to devices, like IP cameras or access points, over a single Ethernet cable, simplifying installation and reducing the need for separate power sources.
PoE (Power over Ethernet) is a technology that allows electrical power and data to be transmitted over a single Ethernet cable to networked devices. This setup is commonly used with devices like IP cameras, wireless access points, and VoIP phones. By combining data and power delivery, PoE simplifies installations, allowing devices to operate without needing an additional power source or nearby electrical outlet. It uses standard Ethernet cabling, typically Cat5e or higher, making it practical for existing network infrastructure.
PoE is managed through power-sourcing equipment, like PoE-enabled network switches or injectors, which supply power through the Ethernet cable. PoE standards, such as IEEE 802.3af (PoE) and IEEE 802.3at (PoE+), define different power levels, supporting various device requirements. This technology reduces setup costs, enables flexible device placement, and is widely used in environments where rapid and cost-effective network expansion is needed.
A PoE switch is a network switch that provides both power and data over a single Ethernet cable to connected devices, like IP cameras and access points, simplifying installation. Acting as power-sourcing equipment, it distributes power according to PoE standards (e.g., IEEE 802.3af, IEEE 802.3at) based on device needs, making it ideal for streamlined network setups in security and smart building applications.
A PoE injector is a device that adds Power over Ethernet (PoE) capability to a non-PoE network connection. It supplies both power and data to a PoE-compatible device, like an IP camera or wireless access point, through a single Ethernet cable, without needing a nearby power outlet.
Typically, a PoE injector is used when a standard network switch does not support PoE. It connects between the network switch and the powered device, injecting power into the Ethernet line, making it useful for setups where upgrading to a PoE switch isn’t feasible.