BlogInfrastructure & networking
PoE explained: powering access points and cameras
By Vicky Ogola, Senior ICT Consultant 1 min read
Power over Ethernet delivers data and power on one cable. Plan the switch power budget and cable lengths carefully.
Power over Ethernet (PoE) lets a network switch power devices such as Wi-Fi access points, IP cameras and phones through the same cable that carries data.
Why it helps
No power outlet is needed at the device, installation is simpler, and devices can be restarted remotely and kept running on the switch's UPS.
Standards and power levels
PoE standards provide different power levels. Check what each device needs — some access points and pan-tilt-zoom cameras need higher-power PoE.
Plan the power budget
A switch has a total PoE budget shared across ports. Add up device requirements and leave headroom.
Protect the switch
Put PoE switches on a UPS so cameras and Wi-Fi survive short outages.
Mind cable quality
Higher power means more heat in cable bundles. Use good-quality cable and avoid very tight bundles.
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About the author
Vicky Ogola
Senior ICT Consultant
Vicky Ogola writes about network design, connectivity, data centres and the infrastructure that business systems depend on.