Power source equipment and power supplying method for power over Ethernet system

A method of supplying power from a power source equipment of a power over Ethernet (PoE) system, wherein the power source equipment comprises:

• at least two connecting ports, each to be connected by a powered device via a network wire;
• an inspection device in connection with the respective connecting ports and configured to detect whether a powered device suited for supplying power is connected with a particular connecting port and to determine a power level to be supplied to the connecting port, and
• a monitoring device configured to allow the power source equipment to supply power to a connecting port connected with a new (non power-supplying) powered device with an upper limit power Icut calculated in accordance with an upper limit power allocation Iclass associated with a class determined associated with the powered device, when the upper limit power allocation Iclasss is smaller than the difference of a total power supply of the power source equipment and a summed power allocation of then power-supplying connecting port and to shut power supply to a connecting port, when power consumption of the connecting port exceeds the upper limit power Icut associated with the connecting port, and to record each such shutdown event Ioff_event of the connecting ports and shutdown power Icut_old, which is the peak value of the power consumption at the last shutdown event Ioff_event or the then effective upper limit power Icut;
• said method being actuated, when an upper limit power allocation Iclass of a connecting port connected by a new powered device not being supplied power is greater than the difference of a total power supply of the power source equipment and a summed power allocation of then power-supplying connecting ports and comprising the steps of:
• continuously inspecting all power-supplying connecting ports to obtain power consumption values along a time axis of the respective connecting ports;
• adjusting the upper limit power Icut of the respective connecting ports with an adjustment value calculated based on the obtained power consumption values;
• calculating a new summed power allocation value using the adjusted upper limit power values Icut;
• and
• determining whether to supply power to the connecting port with the new powered device in accordance with the newly calculated summed power allocation value.