3 Things You Didn’t Know About Power Over Ethernet

Power over Ethernet (PoE) is a technology that allows you to transmit both data and power over a single Ethernet cable. It’s been around for a while, but it’s only in recent years that it’s become more widely used. While PoE is a great technology with many benefits, there are also some things about it that you might not know. In this blog post, we will explore three things you didn’t know about PoE. From its history to how it works and its future, read on to learn more about this interesting technology.

What is Power Over Ethernet?

Power Over Ethernet (PoE) is a technology that allows electrical power to be transmitted over standard Ethernet cabling. This means that devices that require power, such as IP phones, can be powered using the same cable that carries data. PoE is becoming increasingly popular as it offers a convenient and cost-effective way to provide power to devices in difficult or hard-to-reach places.

PoE works by using two of the four pairs of wires in an Ethernet cable to carry both data and power. The Power Sourcing Equipment (PSE) provides power to the device, while the Powered Device (PD) receives power and data from the PSE. There are two main types of PoE: Endspan and Midspan. Endspan PoE is built into network switches, while Midspan PoE is provided by external devices that can be used with any switch.

The advantages of PoE are numerous. In addition to being convenient and cost-effective, PoE also offers a number of safety benefits. Because power is carried over the Ethernet cable, there is no need for exposed electrical wiring which reduces the risk of fire and electric shock. Additionally, because PoE devices are powered through the network cable, they can be located anywhere there is an Ethernet connection – even in difficult or hard-to-reach places.

There are a few things to keep in mind when using PoE. First, not all devices are compatible with PoE. Make

The Different Types of Power Over Ethernet

  1. IEEE 802.3af – this is the most common type of PoE, and is sometimes referred to as “PoE” or “PoE+”. It provides up to 15.4W of power per port, and is typically used for powering devices such as IP phones, wireless access points, and security cameras.
  2. IEEE 802.3at – this is the newer, more powerful version of PoE, and can provide up to 25.5W of power per port. It is often used for powering devices such as HD IP cameras, LED lights, and Point-of-Sale terminals.
  3. Cisco Injector Power – this type of PoE is proprietary to Cisco, and can provide up to 60W of power per port. It is often used for powering devices such as video conferencing equipment and Wi-Fi access points.

Which Devices Can Use Power Over Ethernet?

Power over Ethernet (or PoE) devices can use any type of Ethernet cable, including Cat5, Cat5e, and Cat6. The only exception is that some legacy devices require a special “crossover” cable.

PoE devices can also be powered by 802.3af or 802.3at “PoE Injectors” which supply power over the Ethernet cable but are not themselves powered by PoE.

In addition, some network switches have built-in PoE capability and can power PoE devices without the need for an external injector.


Power over Ethernet is a great way to provide power to devices without having to run separate power cables. It is also more efficient than using a standard AC adapter and can be used in places where there is no AC power available. We hope that you found this article informative and that you now have a better understanding of Power over Ethernet and how it can be used in your home or office.

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