The portClass represents the standard class of the port shown as follows: Class usage Class current Power range Class description [mA] [Watt] ==================================================================== 0 Default 0-4 0.44-12.94 Class unimplemented 1 Optional 9-12 0.44-3.84 Very Low power 2 Optional 17-20 3.84-6.49 Low power 3 Optional 26-30 6.49-12.95 Mid power 4 Valid for 36-44 12.95-25.50 High power Class 4 for 802.3at(Type 2) devices and not allowed for 802.3af devices. Note that a portClass of Default can also exist if a portStatus is not connected.