Abstract: A test board system and method for a power over Ethernet device are disclosed. The test board includes a direct current (DC) power terminal connected to a DC power supply, and includes a network connector, a detection circuit and a classification circuit. The detection and classification circuits are coupled to the network connector and both receive a DC voltage derived from the DC power supply. During different time stages, the detection circuit provides different impedances between the DC power terminal and the network connector. A voltage variation at a test terminal coupled with the network connector shows whether a powered device is connected to the network connector. During a classification stage, the classification circuit provides an impedance device between the DC power terminal and the network connector to build a current path, and classifies the powered device based on a current flowing through the current path.

Abstract: A test board system and method for a power over Ethernet device are disclosed. The test board includes a direct current (DC) power terminal connected to a DC power supply, and includes a network connector, a detection circuit and a classification circuit. The detection and classification circuits are coupled to the network connector and both receive a DC voltage derived from the DC power supply. During different time stages, the detection circuit provides different impedances between the DC power terminal and the network connector. A voltage variation at a test terminal coupled with the network connector shows whether a powered device is connected to the network connector. During a classification stage, the classification circuit provides an impedance device between the DC power terminal and the network connector to build a current path, and classifies the powered device based on a current flowing through the current path.