Power Over Ethernet (PoE)
PoE is an intelligent power supply that uses communication based on the Internet Protocol (IP). This means that the same cable is used for the data connection and the power supply of a device.
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Any previously static device and/or system becomes a data point, capable of doing much more than just turning itself on and off.​
Advantages of PoE
PoE makes the smart, agile building a reality, thanks to its flexibility, easy installation process, and low integration cost.
Integration
PoE allows existing protocols to be used to remotely power off, power on, or reboot any connected device.
PoE makes the smart, agile building a reality, thanks to its flexibility, easy installation process, and low integration cost.
Versatility
PoE powered luminaires can be combined with sensors, wireless communication modules and embedded processors in smart hubs. Additionally, PoE can power any network device that requires up to 90 Watts or less.
PoE makes the smart, agile building a reality, thanks to its flexibility, easy installation process, and low integration cost.
Cost and efficiency
PoE offers a wide variety of opportunities for building automation and building efficiency. PoE technologies and PoE devices offer cost savings and easy installation. Developing lighting automation in this way can obtain savings of up to 35% vs. traditional solutions from other brands.
PoE makes the smart, agile building a reality, thanks to its flexibility, easy installation process, and low integration cost.
PoE Standards
Two and four pair Ethernet
The original IEEE 802.3af-2003 PoE standard provides up to 15.4 W of DC power (minimum 44 V DC and 350 mA)on each port. Only 12.95 W is assured to be available at the powered device as some power dissipates in the cable. The updated IEEE 802.3at-2009 PoE standard also known as PoE+ or PoE plus, provides up to 25.5 W of power for Type 2 devices. The 2009 standard prohibits a powered device from using all four pairs for power. Both of these standards have since been incorporated into the IEEE 802.3-2012 publication.
The IEEE 802.3bt-2018 standard further expands the power capabilities of 802.3at. It is also known as PoE++ or 4PPoE. The standard introduces two additional power types: up to 51 W delivered power (Type 3) and up to 71.3 W delivered power (Type 4). Each pair of twisted pairs needs to handle a current of up to 600 mA (Type 3) or 960 mA (Type 4). Additionally, support for 2.5GBASE-T, 5GBASE-T and 10GBASE-T is included. This development opens the door to new
applications and expands the use of applications such as high-performance wireless access points and surveillance cameras.
Single pair ethernet
The IEEE 802.3bu-2016 amendment introduced single-pair Power over Data Lines (PoDL) for the single-pair Ethernet standards 100BASE-T1 and 1000BASE-T1 intended for automotive and industrial applications. On the two-pair or four-pair standards, the same power voltage is applied to each conductor of the pair, so that within each pair there is no differential voltage other than that representing the transmitted data. With single-pair Ethernet, power is transmitted in parallel to the data. PoDL initially defined ten power classes, ranging from 0.5 to 50 W (at PD).
Subsequently, PoDL was added to the single-pair variants 10BASE-T1, 2.5GBASE-T1, 5GBASE-T1, and 10GBASE-T1 and as of 2021 includes a total of 15 power classes with additional intermediate voltage and power levels.