Wi-Fi Array
Viewing Status on the Wi-Fi Array 141
Spectrum Analyzer
Spectrum analysis on Wi-Fi Arrays is a distributed capability that automatically
covers the entire Wi-Fi 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 abg(n)2 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
abg(n)2 radio is in a listen-only mode, scanning across all Wi-Fi 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 62 (the default presentation), or
horizontally as bar graphs or numerical RF measurements. The measurements
displayed are explained in “Spectrum Analyzer Measurements” on page 143.
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.
The RF measurements for this feature are obtained by IAP abg(n)2, which
must be set to monitor mode for any data to be available. See “IAP
Settings” on page 271.
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