Power over Ethernet, or PoE, has become a foundational technology for modern enterprise networks, simplifying deployments by sending both data and power over a single cable. However, as the number and complexity of connected devices grow, so do their power demands, pushing beyond the limits of the original PoE standard. This has led to the development of more capable versions: PoE+ and PoE++. Understanding the key differences between them is critical for designing a network that can support both your current and future needs.
What is PoE+?
Think of PoE+, officially known as the IEEE 802.3at standard, as a significant upgrade to the original Power over Ethernet. It was introduced to address the rising power demands of more advanced network-connected devices that the first-generation PoE couldn't support. While standard PoE was sufficient for basic IP phones or simple security cameras, many modern devices required more energy to operate their full feature sets, creating a need for a more robust solution.
The key improvement with PoE+ is its ability to deliver up to 25.5 watts of power directly to the end device, which is nearly double what its predecessor could offer. This extra power makes it perfectly suited for a wider range of equipment, including high-performance wireless access points, video-enabled VoIP phones, and pan-tilt-zoom (PTZ) security cameras that have internal motors. It provides a reliable power source over a single Ethernet cable, eliminating the need for a separate AC power adapter for these more demanding pieces of hardware.
What is PoE++?
If PoE+ was an upgrade, then PoE++ represents the next major leap forward in power delivery over Ethernet. Standardized under IEEE 802.3bt, it’s designed to handle the most power-hungry devices on a network. Unlike its predecessors, PoE++ is divided into two distinct categories: Type 3 and Type 4. This separation allows for more flexibility in matching power output to the specific requirements of connected hardware, moving beyond the needs of typical office equipment.
The primary distinction lies in their power capabilities. Type 3 PoE++ delivers up to 51 watts of power to a device, making it suitable for multi-radio wireless access points or complex surveillance cameras. Type 4, often called high-power PoE, pushes the limit even further, supplying up to 71 watts. This substantial power budget can support demanding applications like advanced video conferencing systems, network-attached digital signage, and even components of smart building infrastructure such as LED lighting or access control systems, all through a single Ethernet connection.
Key Differences Between PoE+ and PoE++
While the most obvious difference is the amount of power they supply, several other technical distinctions separate PoE+ and PoE++. For anyone planning a network build-out or upgrade, these details are important for making the right hardware choices. The main points of divergence come down to the underlying hardware requirements and how power is physically transmitted.
- Cabling Requirements: A significant operational difference is the type of cabling needed. PoE+ generally performs well over standard Category 5e (Cat5e) cables, which are common in many existing networks. In contrast, the higher power of PoE++, particularly Type 4, often requires Category 6a (Cat6a) or better cabling to safely manage heat and ensure stable performance without power loss.
- Power Transmission Method: The two standards also differ in how they use the wires within an Ethernet cable. PoE+ sends power over two of the four available twisted pairs. PoE++, however, can use all four twisted pairs at once. This ability to use the entire cable is fundamental to how it achieves its much higher power output.
- Backward Compatibility: It's also helpful to understand how the technologies interact. Equipment built for PoE++ is backward compatible, so a PoE++ switch port can safely power a PoE+ device. The hardware negotiates to deliver the appropriate amount of wattage. The reverse is not true; a PoE+ port cannot supply enough energy for a device that requires PoE++.
Benefits of Using PoE+ in Enterprise Networks
For many businesses, the primary advantage of adopting PoE+ is the significant reduction in deployment costs. By sending power over the same cable that carries data, you sidestep the need to install electrical outlets near every device. This is especially helpful when mounting hardware in difficult-to-reach spots like high ceilings for wireless access points or exterior walls for security cameras, avoiding the expense of hiring an electrician.
This approach also offers tremendous flexibility. Network devices are no longer chained to the nearest power socket, allowing IT teams to position equipment for optimal performance. If you need to rearrange an office, moving a PoE+-powered device is as simple as rerouting an Ethernet cable, making your network far more adaptable.
Furthermore, centralizing power through a PoE+ switch improves network reliability. All connected devices can be protected by a single uninterruptible power supply (UPS), keeping essential services operational during a power failure. This setup also gives IT staff the ability to remotely reboot a malfunctioning device by toggling its switch port, which simplifies troubleshooting.
Advantages of PoE++ for Modern Businesses
On the other hand, the advantages of PoE++ are tied directly to its capacity to support a new class of high-demand devices. As businesses adopt more sophisticated hardware, the extra wattage becomes a necessity. This standard is what makes it possible to power advanced pan-tilt-zoom cameras with built-in heaters for outdoor use, multi-radio wireless access points that handle heavy traffic, or even small workstations and point-of-sale systems directly through the network cable. For any organization planning for long-term growth, building a network with PoE++ provides a foundation that won’t need a costly overhaul in a few years.
Beyond individual devices, PoE++ is a key component for developing smart building infrastructure. Its high power output is sufficient to run entire systems like network-controlled LED lighting grids and sophisticated access control panels. This integration simplifies building management by consolidating power and data onto a single, low-voltage cabling system. By doing so, it reduces reliance on traditional electrical wiring for many building functions, offering greater control and operational efficiency for facilities and IT teams alike.
Choosing Between PoE+ and PoE++: Factors to Consider
Assess Your Current Device Needs
A practical starting point is to take inventory of the devices you currently have on your network. Make a list of your IP phones, security cameras, and wireless access points, and check their technical specifications for power requirements. You will likely find that most of your existing hardware runs perfectly well on the 25.5 watts provided by PoE+. Understanding this baseline helps ground your decision and ensures you don’t overspend on power capabilities that your current setup doesn’t require.
Evaluate Your Infrastructure and Budget
Next, it’s important to look at your budget and existing cabling. PoE++ switches and power sourcing equipment come at a higher cost than PoE+ hardware. This price difference is compounded if your building’s network cabling isn’t up to the task. While PoE+ works reliably over common Cat5e cables, the higher power of PoE++ often needs Cat6a cabling to perform safely and efficiently. Factoring in a potential rewiring project is a critical part of the total cost calculation.
Consider Your Long-Term Technology Roadmap
Finally, think about where your organization is headed in the next three to five years. Are you planning to deploy power-hungry devices like next-generation Wi-Fi 6E access points, 4K security cameras, or large digital displays? If your technology roadmap includes smart building applications like integrated lighting or access control systems, investing in PoE++ now could be a wise move. Paying more for PoE++ today can prevent a costly and disruptive network overhaul down the road when your power needs inevitably grow.
Final Thoughts on PoE+ vs PoE++ for Enterprise Networks
Choosing between PoE+ and PoE++ boils down to balancing your current needs with your future ambitions. For many organizations, PoE+ is the sensible, cost-effective choice today. It comfortably powers most common office hardware, like VoIP phones and wireless access points, and works well with the Cat5e cabling already in many buildings.
On the other hand, PoE++ is an investment in what’s next. If your company is planning to adopt more power-hungry technology—such as advanced PTZ cameras, next-generation Wi-Fi, or smart lighting systems—building your network with PoE++ from the start is a forward-thinking move. It prepares your infrastructure for the demands of tomorrow.
Ultimately, there isn't a single answer for everyone. The best choice depends on a practical assessment of your device inventory, your budget, and your company's technology roadmap for the coming years.
Need Help Managing Your Network? Lightyear Can Help
Choosing the right hardware is a critical first step, but managing the procurement, inventory, and billing for your network devices is an ongoing challenge. Lightyear automates this entire lifecycle, helping hundreds of enterprises achieve over 70% in time savings and 20% in cost savings on their telecom services. Whether you're deploying PoE+ or PoE++ gear, we can help you manage it more efficiently. Sign up for a free account to get started.
Frequently Asked Questions about PoE+ vs PoE++
Can I mix PoE+ and PoE++ devices on the same network switch?
Absolutely. A PoE++ switch can power both PoE+ and PoE++ devices. The switch and the connected device communicate to determine the correct power level, so you can safely connect a mix of hardware without any issues.
Can PoE damage a device that doesn't support it, like a laptop?
No, you don't need to worry about that. PoE switches are smart; they perform a check to see if a connected device is PoE-compatible before sending any power. If it's a non-PoE device like a laptop, no power is delivered over the cable.
Does using PoE affect my network's data speed?
Not at all. The technology is designed to keep power and data signals separate so they don't interfere with one another. Your connection will run at its rated speed, whether it's 1 Gbps or 10 Gbps, regardless of the power being delivered.
What happens if I plug a high-power PoE++ device into a PoE+ port?
The device simply won't get enough power to operate. The PoE+ port cannot supply the higher wattage required by a PoE++ device, so the device will either fail to turn on or will not function correctly.
