The transmission distance of the PoE power supply is not determined by PoE technology, but by the type and quality of network lines. Five kinds of UTP and over five kinds of UTP mainly serve computer networks. According to 100Base-TX of Fast Ethernet, their communication rate is 100mbps When using a PoE power supply, the maximum length should not exceed 100 meters. But in actual construction, in order to ensure the quality of the project, 80-90 meters are usually taken