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Power over Ethernet: How High Can You Go? The 60W Standard Is Nearly With Us.
Microsemi Corporation, Irvine, CA. 20th November 2007
An informative article on the progress of PoEPlus by Daniel Feldmanon Product Line Manager, Microsemi; Voting Member, IEEE802.3; PoE/PoE+ Technical Committee Chairman, Ethernet Alliance.
The Tolly Group & Sifos Technologies; PSE Testing Comparison
Tolley Group, 18th May 2007
The increasing use of PD equipment such as VoIP and wireless access points has to assume that the selected Power Sourcing Equipment works to the 802.3af standard. Recent test by Sifos Technologies shows that you have to look deeper into a PSE rather than just the data sheet.
The Tolly Group worked closely with Sifos Technologies to study two different PSE's extensively and to report on observed ranges in performance in categories such as Static Power Delivery, Transient Power Delivery, Safety, Power Management Behaviors, and Interoperability Characteristics. Approximately 50 different parameters were analyzed with many surprising results.
Application Note on Electrical Transient Immunity for Power over Ethernet
Jean Picard, TI 8th September 2006
Texas Instruments have produced a white paper that is aimed to help designers prevent damage to their devices from external unwanted voltage sources. Common and differential mode examples of induced voltages are discussed as well as ESD and EFT. The abstract is printed below.
Power over Ethernet - The Reality of Designing a Powered Device
Tony Morgan, Senior Applications Engineer, Silver Telecom. 10th July 2006
There have been many technical articles, white papers and product application notes that explain the theory on how to make a powered device. They give an overview of the IEEE 802.3af standard for Power over Ethernet and explain how to extract the power from the CAT5e cable. The following is a practical guide to help take that information and to design a PoE enabled powered device.
Power over Ethernet – The Last Frontier in Industrial Communications Standards
By: Frank Madren, President, GarrettCom, Inc. 26th May 2006
Perhaps the final frontier in the battle for dominance in industrial communications between field buses and Ethernet, is the ability to transmit power and data across the same wire. Shared use of cabling reduces costs, and in some applications, is the only viable solution for extending power to the very edge of an industrial operation.
Power-over-Ethernet Technology for VoIP
Phihong USA 11th December 2005
Phihong has been designing, manufacturing and selling Power-over-Ethernet (PoE) solutions to Voice over Internet Protocol (VoIP) users since the IEEE 802.3af specification was ratified in 2003. The company’s PoE products, which include full-power midspans, splitters, modules PoE-compatible switching power supplies, provide VoIP system users a single point backup in a cost-effective, easy-to-implement package.
PowerDsine white paper on "Power over Ethernet (PoE) Midspan - The Smart Path to Providing Power for IP Telephony"
Sharon Dagan, Product Manager, Systems, PowerDsine 25th October 2005
A interesting white paper which gives you the logical reasoning as to whether to choose Mid Spans or Switches for your VoiP system.
Author: Sharon Dagan, Product Manager, Systems
PowerDsine Inc. Proprietary Information
Copyright © 2005 PowerDsine Inc. All rights reserved.
Power Over the Ethernet—Wave of the Future
Don Findlay 14th September 2005
John Laban discovered that while traveling his collection of power adaptors and cables were just excess baggage.
GarrettCom have published a guide to Power over Ethernet
GarrettCom 13th May 2005
This paper is called Power over Ethernet - The Industrial Opportunity Today. provides a good explanation of POE
Quick Guide to Power Over Ethernet Technology
PowerOverEthernet.com Staff 27th April 2005
Ever since Ethernet was invented and it used a CAT5 cable, engineers have been using the spare conductors in the cable for other purposes. The most common use was to provide power to the other end of the cable, some put two Ethernet connections down the cable.
