User's Manual

The spectrum analysis Swept Spectrogram measures FFT power levels or duty cycle data each second, so after
every 1-second sweep, the newest data appears as a thin colored line on the bottom of the chart. Older data is
pushed up higher on the chart until it reaches the top of the spectrogram and ages out. The example below
shows the Swept Spectrogram chart after it has recorded over 300 seconds of FFT data.
Figure 124 Swept Spectrogram
Table 148 describes the parameters you can use to customize the Swept Spectrogram chart. Click the down
arrow in the upper right corner of this chart, then click the Options menu to access these configuration
settings. Once you have configured the desired parameters, click OK at the bottom of the Options menu to
save your settings and return to the spectrum dashboards.
Parameter Description
Band Radio band displayed in this graph.
For spectrum monitor radios using the 5 GHz radio band, click the Band drop-down
list and select 5 GHz upper, 5GHz middle, or 5Ghz lower to display data for that
portion of the 5Ghz radio band. This parameter is not configurable for graphs
created by hybrid APs or spectrum monitor radios that use the 2.4 GHz radio band.
Channel Numbering
This parameter is not configurable for graphs created by hybrid APs or spectrum
monitor radios that use the 2.4 GHz radio band. A hybrid AP on a 20 MHz channel
sees 40 MHz Wi-Fi data as non-Wi-Fi data. For spectrum monitors using the 5 GHz
radio band, click the Channel Numbering drop-down list and select either 20 MHz
or 40 MHz channel numbering to identify a channel numbering scheme for the
graph. Graphs for AP radios that support 802.11ac include an additional 80MHz
option for very-high-throughput channels.
X-Axis Select either Channel or Frequency to show FFT power or duty cycles for a range
of channels or frequencies. If you select Frequency, you must select the radio
frequency on which this chart should center, and determine the span of frequencies
for the graph.
Table 148: Swept Spectrogram Options
Dell Networking W-Series ArubaOS 6.4.x | User Guide Spectrum Analysis | 738