A PoE switch delivers both data and electrical power to connected devices through a single Ethernet cable, removing the need for separate power adapters or dedicated electrical outlets at every device location. This chapter contains the following sections: A Power over Ethernet (PoE)-capable switch port automatically supplies power to one of these connected devices if the switch senses that there is no power on the circuit: A powered device can receive redundant power when it is connected to a PoE switch. Power over Ethernet (PoE) describes any of several standards or ad hoc systems that pass electric power along with data on twisted-pair Ethernet cabling. As the sole designer of PoE PSE chipsets, PD chipsets and PoE systems, we have an extensive portfolio of comprehensive solutions tailored to your unique business needs. Our. On this page you will learn what differentiates a PoE enabled switch from a regular LAN switch, when you should use a PoE switch versus a PoE injector and, what exactly is PoE (Power over Ethernet) technology. PoE Switches - what are they, when to use them, what to know about them, and when not to. If you're in the market for a Power over Ethernet (PoE) switch, you might have come across terms like PoE+, PoE++, or even just PoE.