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.
Selecting the best controller from several viewpoints; System integrator advice for the IIoT; TSN and real-time Ethernet; Questions to ask when selecting a VFD; Action items for an aging PLC/DCS
Robot advances in connectivity, collaboration, and programming; Advanced process control; Industrial wireless developments; Multiplatform system integration
Sensor-to-cloud interoperability; PID and digital control efficiency; Alarm management system design; Automotive industry advances
Motion control advances and solutions can help with machine control, automated control on assembly lines, integration of robotics and automation, and machine safety.
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!

Big Data and bigger solutions; Tablet technologies; SCADA developments
SCADA at the junction, Managing risk through maintenance, Moving at the speed of data
Flexible offshore fire protection; Big Data's impact on operations; Bridging the skills gap; Identifying security risks
click me