Quick answer
Power over Ethernet (PoE) sends both data and electrical power down a single network cable, so devices like security cameras, Wi-Fi access points, and phones don't need a nearby outlet. It simplifies installs, centralizes power and backup, and is the standard way modern IP cameras and access points are wired.
- One cable carries data and power — no electrician or outlet needed at the device.
- Powers IP cameras, Wi-Fi access points, phones, and more from a central PoE switch.
- Central power means one battery backup keeps every device online during an outage.
- The switch must have enough PoE 'budget' for all connected devices — sizing matters.
When PoE is the right approach
Any time you're placing devices where running power is inconvenient — a camera under an eave, an access point on a ceiling, a door reader. PoE is the default for IP camera and Wi-Fi installs because it removes the outlet problem and lets one UPS protect everything from the equipment closet.
Centralized power and backup
Because power originates at the switch, you protect every PoE device by putting a single battery backup on the switch — cameras and access points keep recording and controlling doors through a power blip. That's far cleaner than a wall wart and UPS at every device.
How it works
How power and data share a cable
A PoE switch (or injector) puts a safe amount of DC power onto the same twisted pairs that carry data. The powered device negotiates how much power it needs, and the switch delivers it. Standard Ethernet cabling carries both, so a single Cat6 run does the whole job.
PoE standards and power levels
Different devices need different wattage — a small camera draws little, a pan-tilt-zoom camera or multi-radio access point draws much more. PoE standards (often called PoE, PoE+, and PoE++) define those power tiers. Matching the device's requirement to the switch's per-port capability is essential.
PoE budget and switch sizing
Every PoE switch has a total power budget shared across its ports. Twelve hungry cameras can exceed a switch that's fine for twelve phones. We total the draw of all devices and size the switch's budget with headroom, so nothing browns out as you add equipment.
Key terms in this guide
Overloading the PoE budget
Plugging more devices into a switch than its power budget supports causes ports to shut off or devices to reboot intermittently — maddening to diagnose. Sizing the switch to the real, total load (with headroom) prevents it.
Distance and cable quality limits
PoE has a standard distance limit per run, and poor or damaged cable undermines both power and data. Quality terminations and respecting run-length limits keep PoE devices stable; long runs may need a midspan or a different design.
Proof & process
- We total every device's draw and size the switch's PoE budget with headroom for growth.
- Centralized PoE lets one battery backup keep cameras and access points online through outages.
How we build this guidance
- Written by Fortify's Texas-licensed low-voltage installers from real DFW camera and Wi-Fi installs.
- PoE budgets and run lengths designed up front to avoid intermittent device faults.
- Vendor-neutral switch and device guidance focused on reliability.
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Common questions
What is Power over Ethernet (PoE)?
PoE is technology that delivers both data and electrical power over a single network cable. It lets you install cameras, Wi-Fi access points, and phones without a nearby power outlet, and centralizes power so one battery backup can keep many devices running during an outage.
Can PoE power my security cameras and Wi-Fi?
Yes — IP cameras and modern Wi-Fi access points are designed to run on PoE. The key is using a PoE switch with enough total power budget and the right PoE standard (PoE, PoE+, or PoE++) for each device's wattage, which we size as part of the design.
How far can a PoE cable run?
Standard PoE runs up to about 100 meters (roughly 328 feet) on quality cabling, the same limit as regular Ethernet. Longer distances need a midspan/extender or a different design, which we plan around your building's layout.