What is PoE – What is PD
A PD is a device that is either drawing power or requesting power from PSE.
The Power Class of PD:
Once a PD is discovered, a PSE may optionally perform PD classification by applying a DC voltage and current to the port, allocated power is subtracted from total power budget.
Any unclassified PD is considered to be a class 0 device.
Class 3 is similar to Class 0 in that it also requests full power, but a Class 3 PD will always draw at least 7W according to the standard, whereas a Class 0 device could draw anything up to full power
Reserved for Future Use
6.49 to 12.95
3.84 to 6.49
0.44 to 3.84
0.44 to 12.94
Maximum Power Levels at Input of Powered Device
The Power Class of PD
PoE IP-Cam (5~12W), PoE IP-Phone (3~6W), PoE Wi-Fi access point (4~11W), PoE RFID Reader, PoE door controller, PoE printer server….etc