Although Ethernet switches are available with PoE capability, millions of regular "non-PoE" switches are in use and continue to be installed. A PoE injector is also called a "PoE adapter." ...

Buy a PoE router or switch, plug in a cable, and away you go! But what lies behind PoE, and how does it work? [Alan] has written a comprehensive guide, based on experience working with the technology.