Introduction, Poe standards – Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) User Manual
Page 586
Power over Ethernet Introduction
Software Reference for x310 Series Switches
22.2
AlliedWare Plus
TM
Operating System - Version 5.4.4C
C613-50046-01 REV A
Introduction
This chapter provides an introduction to Power over Ethernet (PoE) technology, the PoE
standards, PoE devices, and how to configure PoE on your switch. The x310-26FP and
x310-50FP models of x310 series switches are PoE capable. For information about the PoE
commands available on your switch, see
Chapter 23, Power over Ethernet Commands
.
PoE is a method of supplying power to network devices by utilizing the same cabling used
to carry network traffic. PoE is appropriate for devices that have a low power consumption
(termed Powered Devices) such as IP phones and security cameras etc. A number of
standards have been created to define PoE connectivity. Two PoE standards are presently
defined by the Institute of Electrical and Electronics Engineers (IEEE), these are: IEEE
802.3af and IEEE 802.3at.
In addition to the formal PoE methods defined by the IEEE, there are also legacy industry
methods for supplying power over Ethernet cabling. For details of legacy support see the
command,
power-inline allow-legacy command on page 23.5
.
PoE standards
PoE is formally defined by the following standards: formal (defined by the IEEE), and de-
facto (industry developed):
■
IEEE 802.3af Power Ethernet standard
«
Approved 2003.
«
Supplies 15.94 W of power of which 12.95 W is available to each powered device.
«
Superseded by IEEE IEEE802.3at.
«
Fully supported on the x310-26FP and x310-50FP switches
For more information on this standard, refer to
“PoE (IEEE 802.3af)” on page 22.3
■
Enhanced PoE
«
Industry standard introduced after the IEEE 802.af. It provides more power (20 W)
than defined by IEEE 802.3.af but less than the power (30 W) defined by
IEEE 802.3.at.
«
Compliance with this method is provided on the x310-26FP and x310-50FP
switches on a best effort basis.
«
For more information on this standard, refer to
.
■
IEEE 802.3at Power Ethernet standard (commonly known as PoE+)
«
Approved 2009.
«
Supplies 30 W of power of which 25.5 W is available to each powered device.
«
For more information on this method, refer to
«
Fully supported on the x310-26FP and x310-50FP switches.