Power Over Ethernet

[Ethernet Description] [Ethernet Interface ICs]
[Ethernet Connectors] [Ethernet Pin-Out] [OnLine Standards]

Power Over Ethernet Description

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. Pins 4-5 and pairs 7-8 are used for POE, the pinout table is shown below

Power over Ethernet Bus Pin-Out

The pinout table lists one of three possible POE Alternative connections. The two other types will be listed soon.

Twisted Pair POE Ethernet [AII]
Pin # Signal name Function
1 TD+ Transmit Data
2 TD- Transmit Data
3 RD+ Receive Data
4 Positive Vport Power-Over-Ethernet
5 Positive Vport Power-Over-Ethernet
6 RD- Receive Data
7 Negative Vport Power-Over-Ethernet
8 Negative Vport Power-Over-Ethernet

Refer to the AUI Pinout page for the pin out of the AUI connector.

{Ethernet Interface Bus Index}

Ethernet Bus Interface IC Manufacturers

Regular Ethernet interface Integrated Circuits are listed on the main Ethernet page.
This is a listing for hybrid type modules and IC's which develop or control Power over Ethernet interfaces.

IC Vendors;
freescale {IEEE 802.3af Powered Devices (PD) and a high performance current mode switching regulator}

intersil {PoE PWM Controllers}

Linear Technology {PoE Power Supply}

Maxim {PoE DC-DC Controllers}

Microsemi {Power over Ethernet Manager, POE Driver IC, 16-bit Microcontroller Unit (MCU), POE DIMMS, POE SIPs}

Silver Telecom Ltd. {PoE SIP modules}

Texas Instruments {IEEE 802.3af PoE Powered Device Controllers, IEEE 802.3af PD Controller with Integrated DC/DC}

All other types are listed off the main IC Manufacturer page.

{Ethernet Interface Index}

Ethernet Online Standards Information

Telecommunications and information exchange between systems-Local and metropolitan area networks
ANSI/IEEE 802.3 and ISO/IEC 8802-3
ANSI/IEEE 802.3af Power Over Ethernet [2003]
There are many variations which are not listed here.

Institute of Electrical and Electronics Engineers, Inc., IEEE [www.ieee.org]

{Ethernet Bus Index}

Ethernet Bus Connector Vendors

Regular Ethernet interface connectors are listed on the Ethernet page.
Connector Manufacturer for all other types

POE Surge Products

AC Data Systems
{Power over Ethernet Surge device, Outdoor rated}

{Back to Ethernet Bus Index}

PC motherboard

Distributor rolodex Electronic Components Electronic Equipment EDA CDROM Software Engineering Standards, BOB card Cabled Computer Bus Electronic Engineering Design Table Conversion DB9-to-DB25.
DistributorsComponents Equipment Software Standards Buses Design Reference

Modified 1/11/12
Copyright © 1998 - 2016 All rights reserved Larry Davis