Power Over Ethernet (PoE/PoE+) Operation

Introduction to PoE

Introduction to PoE

PoE technology allows IP telephones, wireless LAN access points, and other appliances to receive power and transfer data over existing ethernet LAN cabling. For more information about PoE technology, refer to the PoE Plan­ ning and Implementation Guide, which is available on the ProCurve Net­ working web site at www.procurve.com. Select Support and then click on Manuals.

PoE Terminology

PoE and PoE+ operate similarly in most cases. The CLI commands are the same for a PoE module or a PoE+ zl module. Any differences between PoE and PoE+ operation will be noted, otherwise the term “PoE” is used to designate both PoE and PoE+ functionality.

Term

Use in this Manual

 

 

active PoE port

A PoE-enabled port connected to a PD requesting power.

DTE

Data Terminal Equipment

MPS

Maintenance Power Signature; the signal a PD sends to the switch to

 

indicate that the PD is connected and requires power.

Oversubscribed

The state where there are more PDs requesting PoE power than can be

 

accommodated.

PD

Powered Device. This is an IEEE 802.3af-compliant or IEEE 802.3at­

 

compliant device that receives its power through a direct connection to a

 

PoE port in a PoE device. Examples of PDs include Voice-over-IP (VoIP)

 

telephones, wireless access points, and remote video cameras.

PoE

Power-Over-Ethernet; the method by which PDs receive power from a PoE

 

module (operates according to the IEEE 802.3af standard). Some pre-

 

standard PoE devices are also supported; refer to the FAQs for your switch

 

model.

PoE+ (POEP)

Power-over-Ethernet Plus; the method by which PDs receive power

 

according to the 802.3at standard. It is backward compatible with devices

 

using the 803.3af standard.

PoE Module

Refers to a PoE Module for the switches covered in this guide.

 

 

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