786| Spectrum Analysis AOS-W 6.5.3.x| User Guide
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.
Channel Range If you selected Channel in the X-Axis parameter, you must also specify a channel
range to determine which channels appear in the x-axis of this chart. Click the first
drop-down list to select the lowest channel in the range, then click the second drop-
down list to select the highest channel to appear in the chart.
NOTE: This parameter is not configurable for graphs created by hybrid APs.
Center Frequency If you selected Frequency in the X-Axis parameter, enter the frequency, in MHz,
that you want to appear in the center of the x-axis of this chart.
Span If you selected Frequency in the X-Axis parameter, specify the size of the range of
frequencies around the selected center frequency. If you set a frequency span of
100 MHz, for example, the chart shows the swept spectrogram for a range of
frequencies from 50MHz lower to 50 MHz higher than the selected center.
Color-Map Range If this chart is configured to show average or maximum FFT values, the default color
range on this chart represents values from -50dBm (red) to -90dBm (blue). If you
would like the color range on this chart to represent a different range of FFT power
levels, enter this range in the from and to entry blanks.
For example, if you defined a color-map range from -60 to -80, then any FFT power
level at or above -60 dBm appears as red, and any FFT power level at or below -80
appears blue. Only the channel or frequency qualities between -60 dBm and -80
dBm would be represented by gradiented colors within the color range.
If this chart is configured to show the FFT duty cycle, the default color range on this
chart represents duty cycles from 0% (red) to 100% (blue). If you would like the color
range on this chart to represent a different range of FFT duty cycle percentages,
enter this range in the from and to entry blanks.
For example, if you defined a color-map range from 25 to 75, then any FFT duty
cycle at or below 25% appears as red, and any FFT duty cycle at or below 75%
appears blue. Only the duty cycle levels between 25% and 75% would be
represented by gradiented colors within the color range.
NOTE: If your swept spectrogram is showing a single color only, you may need to
increase the color map range to display a greater range of values.
Show Select FFT Avg, FFT Max or FFT Duty Cycle to select the type of data you want to
appear in this chart.
Table 177: Swept Spectrogram Options
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