Power Over Ethernet
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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
The pinout table lists one of three possible POE Alternative connections. The two other types will be listed soon.
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}
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.
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]
Regular Ethernet interface connectors are listed on the Ethernet page.
Connector Manufacturer for all other
types
AC Data Systems
{Power over Ethernet Surge device, Outdoor rated}
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