PoE vs PoE+ vs PoE++ — Which Power-over-Ethernet Standard Is Right for Your Network?
Power over Ethernet (PoE) simplifies deployments by delivering both power and data through a single Ethernet cable. As device power needs grow, three major standards are commonly used today: PoE (802.3af), PoE+ (802.3at), and PoE++ (802.3bt). This guide explains the differences, cable requirements, and practical selection tips so you can build a robust, future-proof network.
What Each Standard Provides
PoE — IEEE 802.3af
The IEEE 802.3af Power over Ethernet (PoE) standard marked a revolutionary step in simplifying network infrastructure.
Before PoE, every powered network device—like an IP camera or VoIP phone—required both a data cable and a separate power line.
Under the 802.3af standard, PoE delivers up to 15.4 watts per port, with approximately 12.95W usable power after accounting for transmission loss.
That’s sufficient to power a wide range of low-power network devices, including:
VoIP phones and conference phones for unified communication systems
Fixed-lens IP cameras used for indoor or basic surveillance setups
Wireless access points (APs) for small offices or home networks
PoE+ — IEEE 802.3at
As smart devices and network infrastructure evolved, the demand for higher power delivery quickly outgrew the limits of the original PoE (802.3af) standard.To meet the needs of more advanced equipment, the IEEE 802.3at standard, commonly known as PoE+, was introduced.
PoE+ provides up to 30 watts of power per port, with approximately 25.5W usable power after accounting for cable transmission loss.
Typical applications include:
PTZ security cameras — capable of remote movement and zoom functions that demand extra power
Dual-band Wi-Fi 5/6 access points — supporting multiple user connections and higher data throughput
Thin client terminals and interactive kiosks — ideal for modern workplaces
PoE++ — IEEE 802.3bt
As connected devices grow smarter and more power-hungry, the need for a stronger Power over Ethernet standard became essential.
That’s where PoE++ (IEEE 802.3bt) — also known as 4-Pair PoE (4PPoE).
This latest standard significantly expands the capabilities of PoE by using all four twisted pairs in an Ethernet cable to deliver higher wattage.It provides up to 60W per port (Type 3) or 90–100W per port (Type 4), making it the most powerful and flexible PoE solution to date.
Wi-Fi 6 and Wi-Fi 7 access points supporting multi-gigabit speeds
Multi-lens or 360° security cameras with built-in analytics and IR illumination
Smart LED lighting systems and building automation sensors
Interactive digital signage, kiosks, and POS terminals requiring constant power
Small desktop computers, monitors, and AV systems in modern offices
Quick Comparison
| Standard | Max Power / Port | Typical Devices | Recommended Cabling |
|---|---|---|---|
| PoE (802.3af) | 15.4W (≈12.95W usable) | VoIP phones, basic cameras, entry APs | Cat5e / Cat6 |
| PoE+ (802.3at) | 30W (≈25.5W usable) | PTZ cameras, mid-range APs | Cat5e / Cat6 (Cat6 preferred) |
| PoE++ (802.3bt) | 60W / 90–100W | Wi-Fi 6 APs, lighting, displays, kiosks | Cat6 / Cat6A |
How to Choose the Right PoE Level
- Check the device power rating: review the PD (Powered Device) wattage requirement.
- Use high-quality copper cabling (OFC preferred) to minimize voltage drop and heat.
- Consider cable length and bundle size: longer runs and tightly bundled cables increase resistance.
- Plan for future upgrades: if you expect heavier devices later, opt for PoE++ compatible infrastructure now.
Why Gcabling for PoE Networks
Gcabling CAT6 and CAT5e cables are Fluke-tested and UL certified to ensure reliable PoE++ (IEEE 802.3bt) performance. Built with oxygen-free copper (OFC), precise twisting, and high-density insulation, our cables minimize power loss and heat, guaranteeing efficient power delivery and long-term stability for PoE, PoE+, and PoE++ systems.
