PoE+ is an extension of the Power over Ethernet standard that supplies electrical power alongside data through a single Ethernet cable. Standard PoE provides 15.4W, but PoE+ doubles this to 30W per port, making it suitable for hungrier networked devices.
How it works. Power is injected into the cable at a PoE+ injector or switch port, using the same twisted pairs that carry data. Receiving devices (called powered devices or PDs) extract this power through a built-in port or splitter, allowing them to operate without a mains plug nearby.
What you can power. At 30W, PoE+ handles wireless access points, IP security cameras with pan-tilt-zoom motors, VoIP phones with large screens, and small network switches. You cannot run laptops or high-powered printers from PoE+ alone.
Why it matters for buyers. PoE+ reduces cable clutter and installation costs by eliminating the need for power outlets near networked devices. It simplifies deployments in awkward spaces like ceiling-mounted cameras or outdoor locations. Ensure your Ethernet switch explicitly supports PoE+ output, not just PoE, or you will bottleneck device performance.
Common gotchas. Not all PoE+ switches deliver full 30W to every port simultaneously. Check the total available budget in the specifications. Budget also matters: injectors and switches vary widely in price. Standard Ethernet cables (Category 5e and above) work fine, but longer runs over 100 metres may drop voltage at the far end.