Figure 9 is the circuit diagram of a typical PD converter. The PoE front-end identifies the PD as a Class 2 device. The DC-DC converter is a Flyback that uses a Zener diode clamp (VR3) on the MOSFET ...

Buy a PoE router or switch, plug in a cable, and away you go! ... What you see in the image is a diagram. ... PoE extends to 95W… A Class 2 circuit in North America is limited to 100W.