Poe And Ex Series Switches Overview; Poe And Poe+ - Juniper JUNOS OS 10.3 - SOFTWARE Manual

CHAPTER 114
Power over Ethernet (PoE)—Overview

PoE and EX Series Switches Overview

PoE and PoE+

Copyright © 2010, Juniper Networks, Inc.
PoE and EX Series Switches Overview on page 3303
Power over Ethernet (PoE) and Power over Ethernet Plus (PoE+) permit electric power,
along with data, to be passed over a copper Ethernet LAN cable. Powered devices, such
as voice over IP (VoIP) telephones, wireless access points, video cameras, and
point-of-sale devices, that support PoE or PoE+ can receive power safely from the same
access ports that are used to connect personal computers to the network.
This topic describes PoE and PoE+ on Juniper Networks EX Series Ethernet Switches.
It covers:
PoE and PoE+ on page 3303
PoE Power Management on page 3304
PoE Configuration and Monitoring on page 3305
PoE was first defined in the IEEE 802.3af standard. In this standard, the amount of power
that can be supplied to a powered device is limited to 15.4 W. PoE+, which was defined
in the later IEEE 802.3at standard, increases the amount of power to 30 W. The PoE+
standard provides support for legacy PoE devices—an IEEE 802.3af (PoE) powered
device can operate normally when connected to IEEE 802.3at (PoE+) power sourcing
equipment.
Whether an EX Series switch supports PoE, PoE+, or neither depends on the switch model.
Consult your switch hardware guide for information on PoE or PoE+ support.
NOTE: This topic and its related topics hereafter use the term PoE to refer
to both PoE and PoE+. When it is necessary to distinguish between the two
PoE standards, the terms IEEE 802.3af (PoE) and IEEE 802.at (PoE+) are
used.
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