User's Guide

Wireless Array
Viewing Status on the Wireless Array 113
You may sort the rows based on any column that has an active column header,
indicated when the mouse pointer changes to the hand icon . Click Refresh to
update the information at any time. Click Auto Refresh to instruct the Array to
refresh this window automatically.
Spectrum Analyzer
Spectrum analysis on Wireless Arrays is a distributed capability that
automatically covers the entire wireless network, since a sensor is present in every
unit. Arrays monitor the network 24/7 and analyze interference anywhere in the
network from your desk. There’s no need to walk around with a device as with
traditional spectrum analyzers, thus you don’t have to be in the right place to find
outside sources that may cause network problems or pose a security threat. The
Array monitors all 802.11 radio bands (a/b/g/n), not just those currently used for
data transmission.
The RF Spectrum Analyzer window displays instantaneous traffic statistics and
RF readings for all channels, as measured by the Array’s monitor radio. This
differs from the RF Monitor-IAPs window, which displays values measured by
each IAP radio for its current assigned channel. For the spectrum analyzer, the
monitor radio is in a listen-only mode, scanning across all wireless channels. Each
channel is scanned in sequence, for a 250 millisecond interval per channel. The
spectrum analyzer window presents the data as a graphical display of vertical bar
graphs for each statistic as shown in Figure 63 (the default presentation), or
horizontally as bar graphs or numerical RF measurements. The measurements
displayed are explained in “Spectrum Analyzer Measurements” on page 115.
As an aid to viewing data for a particular channel, click the channel number. The
channel will be highlighted down the page (or across the page for a rotated view,
in both text and graph modes). Click additional channels to highlight them for
easy comparison. To remove the highlighting from a channel, click the channel
number again. Click Refresh to update the information at any time. Click Auto
Refresh to instruct the Array to refresh this window automatically.
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The RF measurements for this feature are obtained by the monitor radio. You
must have a radio set to monitor mode for any data to be available. See
“IAP Settings” on page 279.