Power over Ethernet refers to the existing Ethernet twisted pair cabling infrastructure does not make any changes in the situation, for some IP based terminal (such as IP telephone, wireless LAN access point AP, such as network cameras) data signal transmission. At the same time, it can also provide DC power supply technology for such equipment.
The standard five wire network carries four pairs of twisted pair data, but common network cameras use only two of them in l0M, BASE-T, and 100M BASE-T. IEEE802.3af allows two uses, the application of idle feet power supply, 4 and 5 feet connected to the positive electrode, 7 and 8 feet connected to negative. When the data pin is powered, the DC power is added to the midpoint of the transmission transformer, which does not affect the transmission of data.
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