Please briefly describe the meaning and usage of poe devices.

PoE, also known as power system based on LAN or active Ethernet, is sometimes referred to as Ethernet power supply, which is the latest standard specification for transmitting data and power simultaneously by using existing standard Ethernet transmission cables.

PoE(PowerOverEthernet) is the abbreviation of active Ethernet power supply, which refers to the technology of providing DC power supply for some IP-based terminals (such as IP intercom, wifi wireless LAN access point AP, webcam, etc.). ) without changing the existing Ethernet Cat.5 wiring infrastructure. PoE technology can ensure the safety of existing structured wiring and the normal operation of existing networks, and minimize the cost.