POE供电也叫做802.3af—是IEEE组织提出的标准。它可提供48V，4-15.4W的直流输出。输出功率细分可分为四类，如下：IEEE 802.3af Device - Class 0 (15.4W)IEEE 802.3af Device - Class 1 (4W)IEEE 802.3af Device - Class 2 (7W)IEEE 802.3af Device - Class 3 (15.4W)