This read-create value sets the IEEE PoE power class for a port, ranging from 0 to 3 under 802.3af or up to 4 under 802.3at, each class corresponding to a standard maximum power draw. An admin sets this after enabling PoE on the port to constrain or declare the expected power class of the connected device, which affects how much power the switch reserves for it. For example, setting this to 3 on a port reserves power consistent with an 802.3af Class 3 device, up to about 12.95W at the device.