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What Is PoE And How Does It Work?

by Steven Brown

Power over Ethernet (PoE) is a type of technology that allows you to power devices through an Ethernet cable. This means that you can power devices such as IP cameras, phones, and access points without having to plug them into a power outlet. In this blog post, we will explore what PoE is, how it works, and some of its benefits. We will also touch on the different types of PoE so that you can better understand this technology.

What is Power over Ethernet (PoE)?

PoE is a technology for powering Ethernet devices over conventional twisted-pair copper cabling. It eliminates the need for extra power supplies and reduces installation costs by providing power and data over a single cable. PoE is particularly useful for devices that are located in hard-to-reach places or where AC power is not available.

How does PoE work? Power over Ethernet works by using the unused pairs of wires in standard Ethernet cabling to carry DC power. This DC power is then used to power the connected device. The IEEE802.3af standard, also known as PoE, specifies the maximum current and voltage that can be carried over Ethernet cabling.

What are the benefits of PoE? One of the biggest benefits of Power over Ethernet is that it simplifies installation by eliminating the need for extra cabling and AC outlets. PoE also offers improved reliability since there is no need to worry about loose connections or damaged cords. In addition, PoE provides remote management capabilities and can help reduce energy consumption by automatically powering down devices when they are not in use.

How does PoE work?

Power over Ethernet, or PoE, is a technology that allows Ethernet cables to carry electrical power. This means that devices like IP cameras, VoIP phones, and Wireless Access Points can be powered using the same cable that carries their data.

PoE works by sending electric power along the unused pairs of wires in an Ethernet cable. These pairs are typically used for data transmission in Ethernet cables, but they can also be used to carry electrical power. The advantage of using PoE is that it allows devices to be powered without the need for a separate power source.

PoE requires special equipment called “injectors” or “midspans” which are used to inject electric power into the Ethernet cable. Injectors and midspans can be used with any type of Ethernet cable, including Cat5, Cat6, and fiber optic cables.

There are two standards for PoE: 802.3af and 802.3at. 802.3af is the most common standard and it can provide up to 15 watts of power to each device. 802.3at can provide up to 30 watts of power and is sometimes referred to as “PoE+”.

Not all devices are compatible with PoE. In order for a device to work with PoE, it must have a built-in PoE adapter or be connected to a device that has one. Most modern devices that use PoE are compatible with both 802

Advantages of using PoE

There are many advantages of using Power over Ethernet for your networking needs. Perhaps the most obvious benefit is that you can save a lot of money by not having to buy separate power supplies for each device on your network. PoE also simplifies installation and eliminates the need for costly AC wiring.

In addition, Power over Ethernet is very flexible and can be used with a variety of devices including IP telephones, wireless access points, and security cameras. And because PoE uses standard Category 5 or 6 Ethernet cable, you likely already have the infrastructure in place to support it.


Although PoE is a relatively new technology, it shows great promise for a variety of applications. By understanding how PoE works, you can make an informed decision about whether or not it is the right solution for your needs. Whether you are looking to power remote devices or create a more efficient network infrastructure, PoE may be worth considering.

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