Chapter 7: Power Over Ethernet; Summary Of Poe Features - Extreme Networks ExtremeWare XOS Guide Manual

7 Power Over Ethernet
Power over Ethernet (PoE) is an effective method of supplying 48 VDC power to certain types of
powered devices (PDs) through Category 5 or Category 3 twisted pair Ethernet cables. PDs include
wireless access points, IP telephones, laptop computers, web cameras, and other devices. With PoE, a
single Ethernet cable supplies power and the data connection, reducing costs associated with separate
power cabling and supply.
Beginning with ExtremeWare XOS version 11.3, the system supports hitless failover for PoE in a system
with two Master Switch Modules (MSMs). Hitless failover means that if the primary MSM fails over to
the backup MSM, all port currently powered will maintain power after the failover and all the power
configurations remain active.
NOTE
The BlackDiamond 8800 family of switches was formerly known as Aspen.
This chapter covers the following topics:
Summary of PoE Features on page 163
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Power Checking for PoE Module on page 164
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Power Delivery on page 164
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LEDs on page 168
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Configuring PoE on page 169
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Displaying PoE Settings and Statistics on page 173
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Summary of PoE Features

The G48P module for the BlackDiamond 8800 family of switches (formerly known as Aspen) supports
the following PoE features:
Configuration and control of the power distribution for PoE at the system, slot, and port levels
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Real-time discovery and classification of 802.3af-compliant PDs and many legacy devices
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Monitor and control of port PoE fault conditions including exceeding configured class limits and
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power limits and short-circuit detection
Support for configuring and monitoring PoE status at the system, slot, and port levels
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Management of an over-subscribed power budget
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Port LED control for indicating the link state
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Support for hitless failover in a chassis with two MSMs
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For detailed information on using the PoE commands to configure, manage, and display PoE settings,
refer to the ExtremeWare XOS Command Reference Guide.
ExtremeWare XOS 11.3 Concepts Guide
163