Power Over Ethernet; Overview; Summary Of Poe Features - Extreme Networks Summit 300-48 Software User's Manual

8

Power Over Ethernet

This chapter explains how to configure the Summit 300-48 switch to supply power to devices using the
Power over Ethernet (PoE) capability. It contains the following sections:
• Overview on page 95
• Port Power Management on page 96
• Per-Port LEDs on page 98
• Configuring Power Over Ethernet on page 98

Overview

Power over Ethernet (PoE), defined by the IEEE 802.3af specification, is an effective method of
supplying 48 VDC power to certain types of powered devices (PDs) by way of Category 5 or Category 3
twisted pair Ethernet cables. Devices include the Altitude 300 wireless port. IP telephones, laptop
computers, web cameras, or other devices. With PoE, a single Ethernet cable supplies power and the
data connection, thereby saving time and expense associated with separate power cabling and supply.
The 802.3af specification for PoE includes a method of detection to assure that power is delivered only
to devices that meet the specification.

Summary of PoE Features

The Summit 300-48 switch supports the following PoE features:
• Configuration and control of the power distribution for PoE at the system (slot) level
• Configuration and control of the power distribution for PoE at the port level
• Real time detection of powered devices on the line
• Monitor and control of fault conditions
• Support for both human interface and machine interface for configuration and monitoring of status
at the port level
• Management of an over-subscribed power budget
• LED control for indicating the port "power" state
Summit 300-48 Switch Software User Guide 95