Power over Ethernet (PoE) power supply is a technology that transmits data and power through Ethernet cables, integrating power supplies and devices together. The technology can provide power and data transmission for network devices such as IP phones, cameras, and wireless access points. PoE power supply technology is based on IEEE 802.3af and IEEE 802.3at standards and uses a special PoE switch or power supply that transmits power to the device through a central set of pins. The transmitted voltage is usually around 48V, and the maximum power provided is 15.4W (802.3af) or 30W (802.3at). The technology has many advantages in terms of simplification and flexibility in equipment installation, especially for equipment that needs to be deployed in remote or hard-to-reach areas.
1 PoE power supply refers to the transmission of power through network cables to provide power for some network devices that need power supply, eliminating additional power lines, easy installation and management.
2 The principle of PoE power supply is to provide direct current in the network cable, which is achieved by injecting high frequency pulses into the AC signal.
At the receiving end, the direct current is recovered by filters and rectifiers to supply the equipment.
PoE power supply technology is widely used in video surveillance, VoIP phones, wireless access points and other occasions, providing important support for the construction of modern smart buildings and smart cities.
At the same time, it should be noted that PoE power supply needs to meet specific standards to ensure the safety and stability of the device.