POE+ vs POE++: Comparison Guide

Introduction

Power over Ethernet (PoE) technology has transformed network infrastructure by enabling data and power delivery over a single Ethernet cable. This technology is crucial for powering devices such as IP cameras, wireless access points, VoIP phones, and IoT devices.  As the demand for higher power and more advanced devices increases, PoE standards have evolved. This guide will compare PoE+ (IEEE 802.3at) and PoE++ (IEEE 802.3bt) standards, focusing on their specifications, applications, and implications for network infrastructure. This blog explores the capabilities of Cisco PoE switches, reliable and scalable network. By understanding the differences between PoE+ and PoE++ and selecting the right Cisco PoE switches, you can ensure your network meets current and future demands efficiently and effectively.

What is a PoE?

Power over Ethernet (PoE) is a technology that allows both data and electrical power to be transmitted over a single Ethernet cable. This innovation simplifies the installation and deployment of network devices by eliminating the need for separate power sources. PoE enables devices such as IP cameras, wireless access points, VoIP phones, and IoT devices to receive power from the same Ethernet cable used for data transmission, reducing clutter and infrastructure costs. The original PoE standard, IEEE 802.3af, provided up to 15.4 watts of power per port, while the enhanced PoE+ standard, IEEE 802.3at, increased the power delivery to 25.5 watts per port. With PoE, network administrators can easily deploy and manage devices in locations where access to power outlets may be limited or impractical, making it an essential technology for modern networking infrastructure.

Understanding the PoE Standards

The evolution of PoE standards has been driven by the increasing power demands of network devices and the need for greater efficiency and compatibility. The Institute of Electrical and Electronics Engineers (IEEE) has developed several standards to address these requirements.

IEEE 802.3af (PoE)

IEEE 802.3af, commonly known as PoE or PoE Standard, was the first standardized PoE solution introduced in 2003. It provides up to 15.4 watts of DC power per port and operates over Category 5 (Cat5) or higher Ethernet cables. PoE is suitable for powering low-power devices such as VoIP phones, IP cameras, and access points.

IEEE 802.3at (PoE+)

As network devices became more sophisticated and power-hungry, the IEEE introduced an enhanced PoE standard known as IEEE 802.3at, or PoE+. Ratified in 2009, PoE+ increases the power delivery capability to 25.5 watts per port. This higher power output supports devices with greater power requirements, such as PTZ cameras, advanced wireless access points, and video phones.

IEEE 802.3bt (PoE++)

With the proliferation of high-power devices and the emergence of new applications such as digital signage and high-performance access points, the IEEE developed IEEE 802.3bt, also known as PoE++. Ratified in 2018, PoE++ introduces two new power levels:

• Type 3: capable of delivering up to 60 watts per port.
• Type 4: capable of delivering up to 100 watts per port.

PoE++ significantly expands the range of devices that can be powered over Ethernet, including high-power access points, pan-tilt-zoom cameras, laptops, and IoT devices.

Key Components of PoE

To understand how PoE works, it's essential to grasp its key components:

• Power Sourcing Equipment (PSE): This device, typically a PoE-enabled switch or injector, supplies power to the Ethernet cable.
• Powered Device (PD): Any device that receives power over Ethernet, such as IP cameras, access points, and VoIP phones.
• Ethernet Cable: The medium through which both data and power are transmitted. Cat5e, Cat6, or Cat6a cables are commonly used for PoE applications.

Benefits of PoE

• Simplicity: PoE eliminates the need for separate power cables, reducing installation complexity and cost.
• Flexibility: Since PoE-enabled devices are not constrained by their proximity to power outlets, users can arrange their devices more freely.
• Scalability: PoE simplifies network expansion and reconfiguration by enabling the easy addition of powered devices without the need for additional power infrastructure.
• Reliability: PoE systems are designed to be robust and reliable, with safeguards against power surges and other electrical disturbances.

Cisco PoE Switches Overview

Cisco is a leading provider of networking equipment, including a wide range of PoE switches designed to meet various network demands. Below, we'll explore some key models and their features.

Cisco 24 Port PoE Switch

Cisco’s 24 port PoE switches offer a balance of performance and power for mid-sized networks. These switches are ideal for small to medium-sized enterprises, providing robust connectivity and power for a variety of devices.

Key Models and Features

Cisco PoE 48 Port Switch 

For larger networks, Cisco’s 48 port PoE switches offer extensive connectivity and power capacity, supporting a greater number of devices and higher power demands.

Key Models and Features

PoE+ vs PoE++: In-Depth Comparison

Table 1 lists the technical specifications of PoE+, PoE++, and their underlying standards.

Power Capacity

The most significant difference between PoE+ and PoE++ is the power capacity. PoE+ provides up to 25.5 watts per port, which is sufficient for most medium-power devices. In contrast, PoE++ can deliver up to 60 watts (Type 3) or 100 watts (Type 4) per port, accommodating high-power devices like advanced wireless access points, digital signage, and even some laptops. Table 2 gives a little briefing about the power capacity of poe+ and poe++ switches:

Device Compatibility

PoE+ can power devices such as VoIP phones, PTZ cameras, and mid-range access points. PoE++ expands this capability to include high-performance wireless access points, larger and more complex IP cameras, digital signage, and high-powered IoT devices.

Table 3 lists the device compatibility comparison between Poe+ and Poe++:

Cable Infrastructure

Both PoE+ and PoE++ can use Cat5e cables; however, for optimal performance and to handle the higher power of PoE++, Cat6 or Cat6a cables are recommended. This ensures minimal power loss and maintains the quality of data transmission over longer distances.

Table 4 compares the cable infrastructure between Poe+ and Poe++ below:

Cost Implications

Upgrading to PoE++ can be more costly than PoE+ due to the higher power requirements and the need for better cabling infrastructure. However, the ability to power more advanced devices and the potential for greater network efficiency can justify the investment.

How Does PoE work?

Power over Ethernet (PoE) is a technology that allows Ethernet cables to carry electrical power, along with data, to remote devices. This capability simplifies network infrastructure by eliminating the need for separate power cables, outlets, and adapters, making installation and management more efficient. Here's a detailed explanation of how PoE works, covering its components, operation, and advantages.

Components of PoE

Power Sourcing Equipment (PSE): The devices that provide power to the Ethernet cable. PSE can be PoE-enabled network switches (such as Cisco PoE switches) or PoE injectors.

Powered Devices (PD): The devices that receive power over the Ethernet cable. Common examples include IP cameras, VoIP phones, wireless access points, and IoT devices.

Ethernet Cable: Typically Cat5e, Cat6, or higher, which transmits both data and power. The cable consists of twisted pairs of copper wires that carry electrical signals.

How PoE Works: The Process

Detection

When a PoE-capable PSE (like a PoE switch) is connected to a network device, it first performs a detection process to determine if the connected device is PoE-compatible. This is done by sending a low voltage signal to the connected device. If the device is PoE-compatible, it will respond accordingly, indicating it can accept power over Ethernet.

Classification (Optional)

After detection, the PSE may perform a classification process to identify the power class of the PD. This helps the PSE allocate the appropriate amount of power to the PD. The IEEE 802.3af/at standards define several power classes (Class 0 to Class 4), each corresponding to different power levels.

Power Delivery

Once the PD is detected and classified, the PSE begins to deliver power. The power is sent over the Ethernet cable using the spare pairs (in 10BASE-T and 100BASE-T networks) or the data pairs (in 1000BASE-T and above networks). There are two main methods for delivering power:

• Alternative A (End-Span): Power is delivered over the data pairs (pins 1, 2, 3, and 6).
• Alternative B (Mid-Span): Power is delivered over the spare pairs (pins 4, 5, 7, and 8).

Power Maintenance

During operation, the PSE continuously monitors the power consumption of the PD to ensure it is within acceptable limits. If the PD disconnects or stops drawing power, the PSE will stop delivering power to prevent damage to the cable or the PSE itself.

Power Removal

When a PD is no longer needed or is unplugged, the PSE stops delivering power. This ensures that no power is wasted and reduces the risk of overheating or other issues.

Power Classes

Table 5 lists some power classes of poe+ and poe++ below:

Below are detailed lists of Cisco products that support PoE+ and PoE++ features, organized in tables 6 and 7.

Cisco Products Supporting PoE+ (IEEE 802.3at)

Cisco Products Supporting PoE++ (IEEE 802.3bt)

Use Cases for PoE

VoIP Phones

PoE is widely used to power VoIP phones, allowing them to be deployed anywhere without needing a nearby power outlet. This is particularly useful in office environments where flexibility in phone placement is important.

Wireless Access Points

PoE powers wireless access points, enabling them to be installed in optimal locations for wireless coverage, such as ceilings or high walls, without needing an electrical outlet.

IP Cameras

Surveillance systems benefit greatly from PoE, as it allows cameras to be placed in strategic locations without worrying about power sources. This is crucial for both indoor and outdoor surveillance setups.

IoT Devices

The growing number of IoT devices, such as sensors and smart lighting systems, often rely on PoE for easy deployment and power management, especially in smart building environments.

Digital Signage

Digital signage and interactive kiosks can be powered via PoE, simplifying installation and maintenance. This is particularly beneficial in retail, transportation hubs, and public spaces.

Where to Buy?

When considering where to buy Cisco PoE switches, it’s essential to choose a reputable supplier to ensure you receive genuine products with reliable support. One such supplier is ORM Systems. They offer a wide range of Cisco PoE switches, including the Cisco 24 port PoE switch, the Cisco 9300 PoE switch, and the Cisco PoE switch 48 port. ORM Systems provides competitive pricing, excellent customer service, and comprehensive product knowledge to help you make the best choice for your network needs.

For further assistance regarding PoE+ and PoE++ products, visit the ORM Systems website or contact their sales team for more information.

Contact us now and get a discounted price.

Tel: +1 (281) 747-5957 (USA), (+44) 800 3688 330 (UK), (+971) 4 323 8318 (UAE)

Email: [email protected] (For Sales Inquiries)

or visit: https://www.ormsystems.com  Or visit: Cisco 9200 series switches and Cisco Catalyst 9300 switches.

About Us

ORM Systems is a global IT hardware and software solution provider. Our core focus is providing authentic, reliable, and cost-effective IT hardware products along with enterprise software solutions. Our superior customer service team has built a strong correlation between our customers and suppliers. We have laid out our physical presence by having operational branches and warehouses in the UK, USA, Europe and the Middle East. We stock huge inventory globally and provide fast delivery, an absolute supply chain and logistics for our consumers all around the world, with a guarantee of meeting your standard requirements.

Conclusion

Choosing between PoE+ and PoE++ depends on your current and future network needs. PoE+ is suitable for most moderate power requirements and offers a cost-effective solution for many organizations. However, PoE++ provides the flexibility and power necessary to support high-demand devices and future-proof your network infrastructure. Cisco’s range of PoE switches, including the Cisco 24 port PoE switch, Cisco 9300 PoE, and Cisco PoE switch 48 port, offer reliable solutions for both PoE+ and PoE++ standards, ensuring you have the right tools for your specific needs.

By understanding the differences and advantages of PoE+ vs PoE++ and choosing a reputable supplier like ORM Systems, you can build a robust and efficient network that meets your organization’s demands both today and in the future.

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Frequently Asked Questions

Q. What is the difference between PoE+ and PoE++?
A. The main difference lies in the power capacity they provide. PoE+ (IEEE 802.3at) can deliver up to 25.5 watts per port, while PoE++ (IEEE 802.3bt) introduces two new power levels, Type 3 and Type 4, capable of delivering up to 60 watts and 100 watts per port, respectively.

Q. What are some common applications for PoE+?
A. PoE+ is commonly used to power devices such as VoIP phones, PTZ cameras, basic wireless access points, and IoT devices with moderate power requirements.

Q. What devices benefit from PoE++?
A. PoE++ is ideal for powering high-demand devices such as advanced wireless access points, larger IP cameras with higher resolution and advanced features, digital signage, and even some laptops.

Q. Can I use existing Ethernet cables with PoE++?
A. While PoE++ can technically work with Cat5e cables, it's recommended to use higher-grade cables like Cat6 or Cat6a to handle the higher power levels and minimize power loss over longer distances.

Q. Do I need to upgrade my network infrastructure to support PoE++?
A. Upgrading to PoE++ may require some infrastructure upgrades, including better cabling and potentially higher-power PoE switches. However, the benefits of powering more advanced devices and future-proofing your network may outweigh the initial investment.

Q. What are the cost implications of upgrading to PoE++?
A. Upgrading to PoE++ may involve higher initial costs due to the need for better infrastructure and potentially more expensive switches. However, the long-term benefits of supporting more advanced devices and improving network efficiency can justify the investment.