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 network camera, etc.) for the transmission of data signals at the same time, can also provide DC power supply technology for this kind of equipment.
Standard POE: according to the IEEE802.3af/at specification, it is necessary to detect the 25K characteristic resistance at the end of the receiver, then shake hands and shake hands successfully before powering. Otherwise, only data (data) is passed.
Nonstandard POE: is also called "strong supply type", alternating current is used to supply power, not to detect the receiving end, not to shake hands, and to supply power directly to 48V or 54V.