Users Guide

813 | Spectrum Analysis Dell Networking W-Series ArubaOS 6.4.x| User Guide
This chart is not available for W-AP68 access points. A hybrid AP on a 20 MHz channel will see 40 MHz Wi-Fi data as
non-Wi-Fi data.
The power or duty cycle values recorded in each sweep are mapped to a range of colors. In the average or
maximum FFT power Swept Spectrogram charts, the signal strength levels are indicated by a range of colors
between dark blue, which represents -90 dBm, and red, which represents a higher -50 dBm. The duty cycle
Swept Spectrogram chart shows the percentage of the time tick interval that the selected channel or frequency
was broadcasting a signal. These percentages are indicated by a range of colors between dark blue, which
represents a duty cycle of 0% percent, and red, which represents a duty cycle of 100%.
A spectrogram plot is a complex chart that can display a lot of information. If you are not familiar with these
types of charts, they may be difficult to interpret. The following illustrations can help explain how FFT power
data is rendered in a spectrogram format.
The example in Figure 131 shows how an FFT Power chart could appear if a single data measurement was
plotted as a simple line graph.
Figure 131 Simple Line Graph of FFT Power Data
Now, suppose that each channel’s FFT power level was also represented by a color that corresponded to that
specific FFT power level. In the example below, channel 12 has a FFT power level of -50 dBm, represented by
the color red. Channel 1 has a FFT power level of -85 dBm, represented by dark blue.
Figure 132 FFT Power Line Graph with Color