If you have a router that supports PoE but a device that doesn’t (in our case, a Wi-Fi cam that charges over USB), you can power that device over ethernet with a PoE-to-USB adapter (sometimes just called a PoE splitter). How to Add PoE to a USB Device with a PoE-to-USB Adapter Essentially, you’re turning an ethernet cable from a data-only cable to a cable that can transmit both data and power. Otherwise, you can buy what’s called a PoE injector, which will turn a regular ethernet line into a PoE-supported ethernet line. However, in order for PoE to work, you need a router or an ethernet switch that supports PoE (they’ll usually have “PoE” written somewhere near the ethernet ports). They can not only transmit video and audio over an ethernet connection, but draw power over that same cable as well. As mentioned above, most wired surveillance cameras have ethernet built in, allowing them to take advantage of what’s called “Power over Ethernet” (or “PoE” for short).
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