| 摘要 |
PURPOSE: A powered devices and appended devices with class resistors are provided to offer driving voltage to connected additional units by the connection of the corresponding device. CONSTITUTION: If a PoE(Power over Ethernet) processing unit(210) is connected to a PSE(Power Sourcing Equipment) through a communication cable, the PoE processing unit receives a class sensing voltage from the PSE. The PoE processing unit applies the class sensing voltage to a first class resistor(220). If one or more additional units are connected, the additional unit connection part(230) makes each second class resistor be connected with the first class resistor in parallel.
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