Power over Ethernet (PoE) sends electricity and data over a single network cable, so devices like cameras, phones, and access points don’t need their own power outlet.

Why use PoE?

– Fewer cables and outlets

– Easier installation in ceilings and remote locations

– Central power backup (one UPS protects all connected devices)

– Remote reboot of devices from the switch

PoE standards

– 802.3af (PoE): up to about 15 W per port. Phones and basic cameras.

– 802.3at (PoE+): up to about 30 W. Most access points and PTZ cameras.

– 802.3bt (PoE++): up to about 60 W or 90 W. High-power devices, displays, and some Wi-Fi 7 access points.

Plan your power budget

Switches have a total PoE budget, not just per-port limits. Add up the needs of all devices, then add headroom.

Cable considerations

Use quality Cat5e, Cat6, or Cat6a cabling. Avoid cheap copper-clad aluminum cable, which can overheat and perform poorly. Standard Ethernet cable runs are limited to 100 meters.

Alternatives

If your switch lacks PoE, use PoE injectors, but PoE switches are neater and easier to manage.

Tips

– Match device power class to the switch

– Label ports and cables

– Monitor power usage in managed switches

DBR Soft handles design, supply, and installation of PoE networks. Contact us for more information.