IEEE Adopts Proposal for Power over Ethernet

04/16/2007


A proposal allowing midspans used in Power-over-Ethernet applications to put the power onto the data pair as required for Gigabit systems was made by Phihong USA, Freemont, Calif., to the IEEE802.3at task force at its most recent meeting on March 13%%MDASSML%%15, 2007 in Orlando, Fla.

“Numerous presentations to the IEEE have proven that this can be done without affecting the‘channel characteristics’ as specified in IEEE802.3 specifications,” said Keith Hopwood, vice president of marketing for Phihong USA.

Putting the power on the data pair is required for Gigabit systems as all wires are used to carry data. If 4-pair powering gets ratified then it will also be required to carry power on all the wires that carry data as well.

Phihong officials claim that their PoE midspans already do this, and that many customers have already implemented this, although it is technically outside the current IEEE802.3 specification. This approved resolution puts specific text into the new specification that makes it official.

The new standard is now in draft, and many items can still change. The standard is still a year away from ratification, but it is now possible to build hardware that meets these requirements with a high degree of confidence that they will be compliant to the standard.

When implemented as a standard, IEEE 802.3at (PoEPlus) will not only allow POE in Gigabit systems but will enable at least 30 watts of power and potentially up to 60 watts.





No comments
The Engineers' Choice Awards highlight some of the best new control, instrumentation and automation products as chosen by...
The System Integrator Giants program lists the top 100 system integrators among companies listed in CFE Media's Global System Integrator Database.
The Engineering Leaders Under 40 program identifies and gives recognition to young engineers who...
This eGuide illustrates solutions, applications and benefits of machine vision systems.
Learn how to increase device reliability in harsh environments and decrease unplanned system downtime.
This eGuide contains a series of articles and videos that considers theoretical and practical; immediate needs and a look into the future.
Mobile HMI; PID tuning tips; Mechatronics; Intelligent project management; Cybersecurity in Russia; Engineering education; Road to IANA
Save energy with automation; Process control system upgrades; Dispelling controll myths; Time-sensitive networking; Control system integration; Road to IANA
Additive manufacturing advancements; Machine vision enhances robotics; Fieldbus evolution; Process safety; Advice from System Integrators of the Year; Road to IANA
This article collection contains several articles on the Industrial Internet of Things (IIoT) and how it is transforming manufacturing.

Find and connect with the most suitable service provider for your unique application. Start searching the Global System Integrator Database Now!

Flexible offshore fire protection; Big Data's impact on operations; Bridging the skills gap; Identifying security risks
The digital oilfield: Utilizing Big Data can yield big savings; Virtualization a real solution; Tracking SIS performance
Getting to the bottom of subsea repairs: Older pipelines need more attention, and operators need a repair strategy; OTC preview; Offshore production difficult - and crucial
click me