PoE, PoE+, PoE++: Which Standard Do Your APs and Cameras Actually Need?
R
RAMOJ Networking Team
The Four PoE Standards
| Standard | Name | Max Power (Port) | Typical Use |
|---|---|---|---|
| 802.3af | PoE | 15.4W / 12.95W delivered | Legacy APs, VoIP phones, fixed IP cameras |
| 802.3at | PoE+ | 30W / 25.5W delivered | Wi-Fi 5/6 APs, PTZ cams, thin clients |
| 802.3bt Type 3 | PoE++ / 4PPoE | 60W / 51W delivered | Wi-Fi 6E APs, video conferencing bars, digital signage |
| 802.3bt Type 4 | PoE++ / HPoE | 90W / 71W delivered | Laptops, thin-client monitors, LED luminaires |
Sizing the Switch PoE Budget
A common mistake: adding port max powers and specifying that as the switch PoE budget. Real-world draw is lower, but you must account for simultaneous peak — e.g., 48 APs all rebooting after a power event. Reserve 15–20% headroom.
For a 48-port switch serving 48 Wi-Fi 6 APs at 25W each, you need at least 1200W PoE budget + headroom → specify 1440W minimum.
Which Switches Support What
Most modern enterprise switches (Cisco C9300, Aruba 6300M, Juniper EX4400) support 802.3bt Type 4. Older C2960X / ProCurve 2530 lines only do 802.3at. If your refresh cycle is 5+ years out, buy Type 4 now — Wi-Fi 7 APs will need it.
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