Administrator 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 lowerto 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 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 FFT duty cycle for a range of frequencies from 50MHz
lower to 50 MHz higher than the selected center.
Y-axis Select the range of power levels, in -dBm, to appear in the y-axis of this chart. Enter the
lower value in the right field, and the higher value in the left field.
Show Select the checkbox by the following items to display that information on the FFT Power
chart.
l Average: the average power level of all samples recorded during the last 10 sweeps.
l Maxthe The highest power recorded during the last 10 channel sweeps.
l Max Hold: the highest maximum power level recorded since the chart data was reset.
To clear this setting, click the down arrow at the end of the title bar for this graph and
select Clear Max Hold.
Table 166: Real-Time FFT Options
Swept Spectrogram
A spectrogram is a chart that shows how the density of the quantity being plotted varies with time. The
spectrum analysis Swept Spectrogram chart plots real-time FFT Maximums, real-time FFT Averages, or the FFT
Duty Cycle. In this swept spectrogram, the x-axis represents frequency or channel and the y-axis represents
time. Each line in the swept spectrogram corresponds to the data displayed in the Real-Time FFT or FFT Duty
Cycle chart.
Dell Networking W-Series ArubaOS 6.4.x | User Guide Spectrum Analysis | 812