Description
One of the biggest advantages of IP cameras is the ability to transmit signal and power the video camera over a single cable. This feature has been named PoE - Power over Ethernet. This possibility allows you to significantly save on cable and simplify installation.
PURPOSE
To transmit power over an Ethernet cable (usually a UTP Category 5 cable), a special device is required - a PoE injector, which introduces the power supply voltage into the signal cable.
The PoE injector has an input, an output, and a 220V power cable with a plug at the end. The input (LAN) is connected to the cable from your switch or computer, depending on where the signal comes from, and the output (PoE) is connected to the IP camera itself, which is powered by the injector.
As a rule, modern IP cameras use PoE standards IEEE 802.3af, IEEE 802.3at, according to which a voltage of 48V is transmitted over the cable. Increased voltage (low current) allows you to transmit sufficient power over the thin wires of the UTP cable to power the IP video camera itself.
To buy a poe injector means to ensure a stable power supply through a twisted pair cable in places where there are no outlets and wires, for remote devices such as IP cameras, IP phones, data reading devices, etc.