What is PoE and why it simplifies cameras and WiFi
PoE lets you power a device over the same network cable that carries its data. It sounds like a technical detail, but it completely changes how an installation is designed.
One cable, two jobs
PoE (Power over Ethernet) sends electricity down the network cable. A ceiling WiFi access point or a camera on the façade needs just one cable: no socket required nearby.
The standards
- PoE (IEEE 802.3af): up to about 15 W per port. Enough for many access points and cameras.
- PoE+ (802.3at): up to about 30 W. For more powerful access points or cameras with heaters.
- PoE++ (802.3bt): up to 60–90 W. For PTZ cameras, displays or demanding equipment.
The network cable can run up to 100 metres between the switch and the device.
What runs on PoE
- WiFi access points.
- IP cameras.
- Video intercoms and access readers.
- IP phones.
- Some sensors and control panels.
Benefits
- Less electrical work: fewer sockets and power adapters.
- Freedom of placement: the device goes where it's needed, not where there's power.
- Remote control: restart a device from the switch without a site visit.
- Continuity: with a UPS on the switch, cameras and WiFi keep running during a power cut.
What to watch
The switch needs enough power budget for every connected device, and cabling must be good quality (Cat 6 or above). In new builds, leave ceiling and façade outlets with PoE in mind.
Frequently asked questions
Can I use PoE with the operator's router?
It usually doesn't provide PoE. You need a PoE switch or injectors.
Is it safe?
Yes. The switch negotiates power with each device and doesn't send power to non-PoE equipment.
Connect · Protect · Automate · Control
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