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POE - Power Over Ethernet
Many applications benefit from electrical power sent over ethernet cables.
This avoids a separate power cord for things like internet phones and wireless access points.
Fortunately and unfortunately, there are several ways to do this.
Fortunately you have several choices, unfortunately they are not all compatible.
Fortunately you are at the right place to sort out the confusion between standards.
PoE basically 'injects' power into an...
preview:
http://www.altair.org
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overview
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Power over ethernet / quick list
The Ethernet interface is a cable bus which runs over copper or fiber.
However only the copper interfaces which use differential twisted pairs, use Power Over Ethernet [POE]. This page describes the POE interface.
The 'normal' Ethernet network is defined by IEEE 802.3. A description of the 802.3 interface is found on the main Ethernet page.
POE uses the spare wires not used by the Ethernet interface to deliver a DC voltage over the cable....
preview:
http://www.interfacebus.com
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overview
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Power over ethernet @ Wikipedia
Power over Ethernet or PoE technology describes a system to transfer electrical power, along with data, to remote devices over standard twisted-pair cable in an Ethernet network.
This technology is useful for powering IP telephones, wireless LAN access points, network cameras, remote network switches, embedded computers, and other appliances where it would be inconvenient, expensive (mains wiring must often be done by qualified and/or...
preview:
http://en.wikipedia.org
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overview
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Understanding Power-over-Ethernet (PoE)
Power-over-Ethernet (Poe) uses two twisted pairs in a standard TIA-568B CAT5/6 RJ-45 Ethernet cable connection to carry DC power to a PoE-enabled device.
Here are some important definitions: IEEE 802.3af: Provides 48VDC up to an effective load of roughly 10 watts to a distance of 100 meters IEEE 802.3at: Provides 48VDC up to an effective load of 30 watts (or more). This is an evolving standard and is not currently widely implemented....
preview:
http://www.connect802.com
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article
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PoE with integrated digital isolation saves energy and money
Employing on-chip electrical isolation between primary and secondary power in PoE devices provides real-time power management, parts count reduction, and substantial energy savings for large enterprises and Industrial Ethernet users.
Today, network power can be consolidated at Power Sourcing Equipment (PSE) in the data center, thanks to the latest Power over Ethernet (PoE) standards that enable power to be delivered to network devices along...
preview:
http://www.industrial-embedded.com
date: 7/21/2009
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article
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Power over Ethernet -- Ready to Power On?
You no longer need to imagine such a scenario, because with the forthcoming new IEEE standard 802.3af, also known as Power over Ethernet (PoE), your dreams of power over network wiring are now a gigantic step closer to reality.
Power over Ethernet promises to enable these applications and many more by providing up to 12.95 watts of power (at 48 volts) over the same Category 5 cable that already delivers your standard 10/100/1000Mb Ethernet...
preview:
http://www.wi-fiplanet.com
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paper
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Ethernet Alliance: Power over Ethernet Plus
The standard for Power over Ethernet (PoE), IEEE Std. 802.3af™-2003, helped increase the value of an Ethernet port by connecting and powering devices such as IP Phones using a common network infrastructure.
An upcoming PoE standard known as Power over Ethernet Plus (PoE Plus) or IEEE P802.3at promises to deliver more power to enable a new breed of Ethernet devices and continue to support IEEE 802.3af. This document provides an overview of PoE Plus.
preview:
http://www.ethernetalliance.org
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