IEEE 802.3bt four-pair Power over Ethernet standard update

Andrew Jimenez, Vice President of Technology at Anixter, provides an update on the IEEE 802.3bt four-pair Power of Ethernet standard.

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Four-pair Over Ethernet Standard Video Transcript

Hi, I’m Andy Jimenez, Vice President of Technology at Anixter. I’d like to give you an update on the IEEE 802.3bt four-pair Power over Ethernet standard.

The potential for Power over Ethernet has always been great. It promises to run power over twisted pair and only having to run one cable to a device instead of two.

But that potential has been limited to a small number of low power devices due to the power constraints of the PoE standards. The first PoE was 15.5 watts soon followed by PoE+ at 25.4 watts. Definitely useful but limited.

The new 802.3bt task force is putting together a standard that will allow for the transfer of 49 watts. They plan to do this by running power over all four pairs of a UTP cable.

With that much power, many more devices can be powered by PoE. For instance:

  • Nurse call systems are between 30 and 50 watts.
  • Point of sale systems for retail are usually in the 30 to 60 watt range.
  • In the financial world, IP turrets are typically powered with 45 watts.
  • In the building management world there are lighting fixtures and controls as well as access control systems that need 40 to 50 watts.
  • IP security cameras with pan tilt and zoom motors are typically draw from 30 to 60 watts.
  • And even factory equipment like brushless and stepper drives and motor control units consume just over 30 watts of power.

With the coming 802.3bt standard, all of these devices will be able to be powered over UTP. While at the same time, the UTP also brings an Ethernet signal up to 10 gigs.

The IEEE task force for 802.3bt expects to publish the standard in mid to late 2015.

For more information on PoE or any IEEE standards, contact your local Anixter representative.