PoE Switch Buying Guide: How Many Ports and How Much Power Do You Need?

If you're adding a couple of access points or a security camera to a wired network, at some point you'll run into the question: do I need a PoE switch, and if so, which one? Here's the short version, plus how to actually size it.

What PoE actually does

Power over Ethernet sends electrical power down the same cable that carries data, so a device like an access point or camera doesn't need its own power adapter and outlet nearby. That matters most when the device is mounted somewhere without a convenient plug — a ceiling, an outdoor wall, above a doorway.

Without PoE, every one of those devices needs its own power brick run to the nearest outlet, which gets messy fast once you're past one or two devices.

PoE vs PoE+: what's the difference

These aren't just marketing terms — they cap how much power a single port can deliver:

• PoE (802.3af): up to about 15.4W per port. Fine for most access points, basic cameras, and IP phones.
• PoE+ (802.3at): up to about 30W per port. Needed for higher-power devices — PTZ cameras, some outdoor access points, or anything with heaters/motors built in.

Check the device's power draw before assuming standard PoE is enough. Most home and small-office access points are comfortable on PoE; outdoor and pan-tilt-zoom cameras more often need PoE+.

Sizing the switch: port count and power budget

Two numbers matter, and people usually only check one:

• Port count. Count what you're powering today, then add a few spare ports for the access point or camera you'll inevitably add later. Going from a 5-port to an 8-port switch now is cheaper than replacing the whole switch in six months.
• Total PoE power budget. Every switch has a maximum wattage it can supply across all ports combined, not per port. A switch with eight PoE ports doesn't necessarily support all eight running at full PoE+ power simultaneously — check the total budget against your device count times each device's draw.

Managed, smart, or unmanaged?

For a straightforward setup — plug in a few access points and cameras, done — an unmanaged or "easy smart" PoE switch is enough. If you need to prioritize traffic, set up VLANs to keep camera traffic separate from office traffic, or troubleshoot which port is drawing power remotely, step up to a managed switch. Most small deployments don't need full management; most business deployments with more than a handful of devices benefit from it.