Home » What Are The Power over Ethernet Standards?

What Are The Power over Ethernet Standards?

by postvines7
What Are The Power over Ethernet Standards?


Power over Ethernet, or PoE, is a type of data and power transmission technology. It is used in many applications such as Voice over IP (VoIP), security cameras, and Wireless Access Points (WAPs). The standards for PoE are set by the Institute of Electrical and Electronics Engineers (IEEE). In this blog post, we will be discussing what the different Power over Ethernet standards are. We will also touch on what devices they are compatible with and their maximum power output. By the end of this post, you should have a good understanding of the various PoE standards and how they can be applied in your own network.

The Different PoE Standards

In short, there are three different Power over Ethernet standards: 802.3af, 802.3at, and 802.3bt. Each standard has different power output capabilities that make them more or less suitable for certain applications.

802.3af is the original PoE standard with a maximum power output of 15 watts. It was released in 2003 and is commonly used for lower-power devices such as IP phones and wireless access points.

802.3at is an updated version of the 802.3at standard with a maximum power output of 30 watts. It was released in 2009 and is commonly used for devices that require more power, such as video surveillance cameras and pan-tilt-zoom cameras.

802.3bt is the latest PoE standard with a maximum power output of 60 watts. It was released in 2018 and is ideal for use with high-powered devices such as 4K security cameras and multi-access point Wi-Fi systems.

Which Devices Use PoE?

PoE standards are used by a variety of devices, including VoIP phones, IP cameras, and wireless access points. While there are a number of different PoE standards, the most common one is 802.3af. This standard provides up to 15 watts of power to devices that are connected to an Ethernet network.

How PoE Works

PoE is short for Power over Ethernet, a technology for transmitting electrical power safely and efficiently over Ethernet cabling. PoE was first defined in 2003 by the IEEE 802.3af standard, which provides up to 15.4 watts of power per port. The 802.3at standard, approved in 2009, raised the maximum power to 30 watts per port. In 2018, the IEEE approved the 802.3bt standard, which supports up to 90 watts of power per port.

PoE works by injecting a low-voltage DC current into the unused pairs of wires in an Ethernet cable. This voltage is used to power devices such as IP phones, wireless access points, and security cameras that are connected to the Ethernet cable. The advantage of PoE is that it simplifies wiring by eliminating the need for separate power cables and reduces installation costs.


As you can see, there are a variety of Power over Ethernet standards to choose from depending on your needs. Whether you’re looking for increased power output or faster data transfer speeds, there’s a standard that can accommodate you. Be sure to do your research before settling on a particular standard to ensure it will meet your needs

You may also like