Power Over Ethernet: How Does This Technology Work?

If you’re in the tech industry, chances are you’ve heard of Power over Ethernet (PoE). But what is this technology and how does it work? In this blog post, we will explore the basics of PoE and how it can be used in your business or home. We will also touch on the different types of PoE and their applications. By the end of this post, you should have a better understanding of PoE and how it can benefit you.

What is Power Over Ethernet?

Power over Ethernet (PoE) is a feature that allows Ethernet cables to carry electrical power. This means that devices that are connected to an Ethernet network can receive power through the same cable that they use for data connectivity. PoE was originally designed for voice over IP (VoIP) phones, but it can also be used for other devices such as wireless access points, security cameras, and IPads.

The biggest advantage of using PoE is that it simplifies installation and reduces costs by eliminating the need for separate electrical outlets and wiring. It also offers a degree of flexibility since devices can be powered from any location on the network where there is an available Ethernet connection.

PoE works by injecting power onto the Ethernet cable itself. There are two different standards for doing this, 802.3af and 802.3at. The older 802.3af standard can provide up to 15 watts of power, while the newer 802.3at standard can provide up to 30 watts. Most PoE-compatible devices will work with either standard, although some may require specific hardware in order to function correctly.

In order to take advantage of PoE, both the network equipment and the device must be compatible with the technology. For example, a VoIP phone that supports PoE will have an internal power supply that can extract power from an Ethernet cable and use it to charge its battery or run its internal components. Alternatively, some devices may have an external power

How Does Power Over Ethernet Work?

Power over Ethernet (PoE) is a technology that enables electrical power to be transmitted over standard Ethernet cables. This means that devices such as computers, cameras, and VoIP phones can be powered through the same cable that is used to transmit data.

PoE works by using two pairs of wires within an Ethernet cable – one for data transmission and one for power. The power is transmitted using Direct Current (DC), which flows in one direction only. The voltage of the DC signal is typically 48 volts, although it can range from 36-57 volts.

For devices to be compatible with PoE, they must have a built-in PoE injector or splitter. The injector draws power from an AC outlet and converts it into DC before sending it down the Ethernet cable to the device. The splitter does the opposite, taking the DC power from the Ethernet cable and converting it back into AC so that it can be used by the device.

In order for PoE to work correctly, all components must be properly rated for both voltage and current. If any component is not rated correctly, it could cause damage to either the device or the PoE equipment.

What are the Benefits of Power Over Ethernet?

One of the benefits of Power over Ethernet is that it can deliver both data and power to devices through a single cable. This means that you can use a single cable to connect devices like computers, VoIP phones, and IP cameras to your network.

Power over Ethernet also offers a number of other benefits, including:

Cost savings: Power over Ethernet can save you money by eliminating the need for separate power cables and outlets for each device on your network.

Flexibility: Power over Ethernet gives you the ability to locate devices anywhere on your network, without being constrained by the location of power outlets.

Scalability: Power over Ethernet is easy to scale as your needs grow. You can simply add more devices to your network without having to worry about installing additional power outlets or running new power cables.

What are the Drawbacks of Power Over Ethernet?

There are a few potential drawbacks to using Power over Ethernet technology. First, it can be more expensive than other options for powering devices. Additionally, PoE requires specialized equipment that may not be compatible with all types of devices. Finally, Power over Ethernet can be less reliable than other power options, as it is dependent on the network connection.


Power over Ethernet (PoE) is a great technology that allows devices to be powered through an Ethernet cable. This can be extremely helpful in situations where power outlets are not readily available, or when you want to minimize the amount of wiring in your home or office. If you’re interested in PoE, be sure to check out our selection of PoE products to find the perfect solution for your needs.