Understanding IEEE802.3bt PoE Standard

Understanding IEEE802.3bt PoE Standard

Introduction to IEEE802.3bt PoE Standard

IEEE802.3bt PoE standard is the latest Power over Ethernet standard released by the IEEE in September 2018. It defines new methods of sending up to 100W of power over Ethernet cabling and is backward compatible with existing PoE standards.

The increased power levels allow for new applications of Power over Ethernet, such as powering high-powered devices such as Access Points, IP Phones, and Security Cameras. The additional power also allows longer cable runs, up to 100m (330ft) for Type 3 cables.

IEEE802.3bt PoE is currently in the early stages of adoption, with manufacturers just starting to release products that support the standard. In the coming years, we expect to see a wide range of devices supporting IEEE802.3bt PoE, making it the new de-facto standard for Power over Ethernet cabling.

The Different Classes of IEEE802.3bt PoE

When it comes to PoE, not all devices are created equal. Different classes of IEEE802.3bt PoE++ offer different levels of power output and capabilities. Here is a rundown of the different classes of IEEE802.3bt PoE:

Class 0: This class offers up to 4 watts of power and is typically used for devices like IP phones or wireless access points.

Class 1: This class offers up to 7 watts of power and is typically used for devices like webcams or security cameras.

Class 2: This class offers up to 12 watts of power and is typically used for devices like VoIP phones or tablet chargers.

Class 3: This class offers up to 25 watts of power and is typically used for devices like desktop computers or printers.

Class 4: This class offers up to 60 watts of power and is typically used for devices like large displays or video conferencing systems.

The Power Delivery Method of IEEE802.3bt PoE

As the name suggests, IEEE802.3bt PoE delivers power over Ethernet cables. This standard was created to improve the previous 802.3at PoE standard by increasing the maximum power delivered over an Ethernet cable. 

The new 802.3bt standard increases the maximum power that can be delivered from 48 watts to 96 watts. This is accomplished by using all four pairs of wires in an Ethernet cable instead of just two pairs as in the older 802.3at standard.

One common application for PoE is IP cameras. IP cameras are often used in security applications where it is essential to have a reliable power source. 

IEEE802.3bt PoE allows IP cameras to be powered through the same Ethernet cable to send video and data signals back to a network video recorder (NVR). This eliminates the need for a separate power source, saving both money and installation time.

The Compatibility of IEEE802.3bt PoE

IEEE802.3bt PoE is fully compatible with all Ethernet cabling types, including Cat5e, Cat6, and Cat7. 

It can also be used with any existing PoE devices, such as IP cameras, VoIP phones, and wireless access points. The new standard supports up to 100 watts of power per port, which is enough to power even the most power-hungry devices.


IEEE802.3bt is the latest power over Ethernet (PoE) standard and provides many benefits over the older 802.3af standard. It delivers more power, is more efficient, and is backward compatible with existing PoE devices. 

If you want to deploy PoE in your network, understanding 802.3bt is essential.

Shafie SEO

SEO Blogger

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