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22 Mar 2019, 10:00

IEEE 802.3bt: updated PoE standard

Victoria Valevskaya
News IEEE 802.3bt: updated PoE standard

The IEEE 802.3bt standard is designed to increase the maximum PoE power available, largely due to the use of all four pairs of structured cable.

Since ratification of the first PoE standard in 2003, the use of PoE has increased dramatically and has been applied in new applications. PoE provides tremendous benefits in terms of ease of installation, cost savings on capital (CAPEX) and operational (OPEX) costs, ensuring a unified and safe power supply standard for use in all countries.

The main limiting factor affecting the use of PoE in new applications is the amount of available power. While 15.4 watts of power supply is enough for most IP phones and 802.11a / b / g access points, this is not enough for IP videophones, 802.11n access points and PTZ IP cameras. For this reason, the Institute of Electrical and Electronics Engineers (IEEE) released the IEEE 802.3at standard in 2009, indicating 30 watts for the PoE source.

Today, there is a need for even more power to power modern devices, 802.11ac and 802.11ax access points, connected LED spotlights, etc., capable of using PoE.

The IEEE 802.3bt standard increases the maximum PoE power available, largely due to the use of all four pairs of structured cable. IEEE 802.3bt extends the power classification information as compared to the initial standard alignment to ensure a wider power management capability, providing support for multiple PoE classes, as well as being backward compatible. These enhancements solve the problem of higher power and more efficient use of PoE technology.

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