PoE Switches Explained: Everything You Need to Know
Power over Ethernet (PoE) is one of the most practical innovations in networking. It lets you power devices like access points, IP cameras, and VoIP phones through the same Ethernet cable that carries data — eliminating the need for separate power adapters.
PoE Standards
| Standard | Power per Port | Total Wattage | Use Case |
|---|---|---|---|
| 802.3af (PoE) | 15.4W | Up to 15.4W | VoIP phones, basic APs |
| 802.3at (PoE+) | 30W | Up to 30W | WiFi 6 APs, PTZ cameras |
| 802.3bt (PoE++) | 60-90W | Up to 90W | Video conferencing, LED lighting |
What is PoE Budget?
The PoE budget is the total wattage a switch can deliver across all its ports. For example, the Ubiquiti USW Pro 24 PoE has a 400W budget — meaning it can power multiple devices simultaneously up to that total.
Planning tip: Add up the power requirements of all devices you plan to connect, then choose a switch with at least 20% more budget than your total need.
Managed vs Unmanaged PoE Switches
Our Top PoE Switch Picks
MikroTik CRS326-24G-2S+RM
Ubiquiti USW Pro 24 PoE
Conclusion
PoE simplifies your network infrastructure and reduces installation costs. Whether you're deploying a few access points or building a full enterprise network, choosing the right PoE switch is essential. Browse our full range of PoE switches at Centrix.