In the practical application of the POE power supply system, there are many APs or antennas of the base stations AP and antennas of the mobile base station, which are often installed at the high-end points of the building. Therefore, these power-receiving devices also become high-rising points for lightning strikes. Therefore, for such data network centers, not only should we consider building a good lightning protection net and a good grounding system, but also the protection of lightning induction and lightning wave intrusion.

Inductive lightning is caused by lightning when the lightning is discharged between the thundercloud and the thundercloud. The nearby outdoor power line, transmission signal line, and equipment connection line generate electromagnetic induction and invade the equipment, causing the serial connection in the middle of the line or the terminal equipment to be damaged. . Lightning wave intrusion refers to a lightning wave that invades along a transmission line by direct or electromagnetic induction and electrostatic induction. The AP that is exposed to the high point is invaded by the inductive lightning and lightning waves. The main reason is that it enters the data terminal equipment or the POE power supply system through the electromagnetic coupling or electrostatic induction of the signal line of the PSE power supply connected to the base station main equipment. Surge pulse. Therefore, a corresponding multi-level lightning protection circuit must be installed at the signal line interface of the power receiving device AP and the power supply device PSE to avoid damage to the base station main device by the induced lightning current and the lightning wave.