Cisco AIR-WLC2006-K9 - Wireless LAN Controller 2006 Guía de usuario descargar pdf (Pagina 41)

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Cisco Wireless LAN Solution Product Guide

OL-7955-01

Chapter 1 Overview

File Transfers

Using DFS, the controller monitors operating frequencies for radar signals. If it detects radar signals on

a channel, the controller takes these steps:

• It changes the access point channel to a channel that has not shown radar activity. The controller

selects the channel at random.

• If the channel selected is one of the channels in Table 1-1, it scans the new channel for radar signals

for 60 seconds. If there are no radar signals on the new channel, the controller accepts client

associations.

• It records the channel that showed radar activity as a radar channel and prevents activity on that

channel for 30 minutes.

• It generates a trap to alert the network manager.

File Transfers

The Cisco Wireless LAN Solution operator can upload and download operating system code,

configuration, and certificate files to and from a Cisco Wireless LAN Controller using CLI commands,

Web User Interface commands, or Cisco WCS commands.

• To use CLI commands, refer to the “Transferring Files to and from a Controller” section on

page 6-2.

• To use Cisco WCS commands, refer to the “Using Cisco WCS to Update System Software” section

on page 9-19.

Power over Ethernet

Lightweight access points can receive power via their Ethernet cables from 802.3af-compatible Power

over Ethernet (PoE) devices, which can reduce the cost of discrete power supplies, additional wiring,

conduits, outlets, and installer time. PoE also frees installers from having to mount Cisco 1000 series

lightweight access points or other powered equipment near AC outlets, providing greater flexibility in

positioning Cisco 1000 series lightweight access points for maximum coverage.

When you are using PoE, the installer runs a single CAT-5 cable from each lightweight access point to

PoE-equipped network elements, such as a PoE power hub or a Cisco WLAN Solution Single-Line PoE

Injector. When the PoE equipment determines that the lightweight access point is PoE-enabled, it sends

48 VDC over the unused pairs in the Ethernet cable to power the lightweight access point.

The PoE cable length is limited by the 100BASE-T or 10BASE-T specification to 100 m or 200 m,

respectively.

Lightweight access points can receive power from an 802.3af-compliant device or from the external

power supply.

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Cisco AIR-WLC2006-K9 - Wireless LAN Controller 2006 Guía de usuario Pagina 41