PoE (Power over Ethernet) injectors are devices used to supply electrical power to network devices over an Ethernet cable. Ethernet cables typically transmit data, but with the introduction of PoE technology, they can also carry power to compatible devices.
A PoE injector is a standalone device that connects to a power source, such as a wall outlet, and an Ethernet switch or router. It injects power into the Ethernet cable, allowing it to simultaneously transmit data and provide electrical power to a connected PoE-enabled device. Providing PoE to devices can be achieved with a single port PoE injector to combine both power and data onto a single RJ45 Ethernet cable.
The main purpose of PoE injectors is to simplify the installation and deployment of network devices, particularly in situations where it may be difficult or inconvenient to provide separate power sources for each device. PoE eliminates the need for additional power cables and outlets, reducing the complexity and cost of installation.
PoE injectors typically adhere to the IEEE 802.3af or 802.3at standards, which define the specifications for delivering power over Ethernet. These standards specify the maximum power that can be delivered, with 802.3af supporting up to 15.4 watts per port and 802.3at (also known as PoE+) supporting up to 30 watts per port.
Common applications of PoE injectors include powering IP phones, wireless access points, IP cameras, network switches, and other network-connected devices. It's important to ensure that the devices being powered are compatible with PoE, as not all network devices support this technology by default.