Users Guide

640 | Spectrum Analysis Dell PowerConnect W-Series ArubaOS 6.1 | User Guide
there may be a large number of FFT signatures received by the radio every second, an algorithm selects one FFT
sample to display in the Real-time FFT chart every second.
This chart can show an average for all samples taken over the last second, the maximum FFT power measured for
all samples taken over ten channel sweeps, and the greatest FFT power recorded since the chart was last reset.
When you hover your mouse over any line, a tooltip will show the power level and channel or frequency level
represented by that point in the graph. When you hover your mouse over a frequency level (within the blue
brackets on the graph), a tooltip will show the types of devices seen on that frequency, as well as each device’s
BSSID, power level, channels affected and the time the device was last seen by the spectrum monitor.
Figure 151 Real-TIme FFT
By default, this chart shows the maximum power level recorded for any device on all channels or frequencies
monitored by the spectrum monitor radio.
Table 140 describes the other parameters you can use to customize the Real-time FFT 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.
NOTE: This chart is only available for AP models W-AP105, W-AP92, W-AP93, W-AP175and the W-AP130 Series.
Table 140 Real-Time FFT Options
Parameter Description
Band This field shows the radio band used by the spectrum monitor or hybrid AP radio (2.4 GHz or 5GHz). It is not
selectable and cannot be changed via the Options window.
Channel
Numbering
For spectrum monitors using the 5 GHz radio band, select either 20 MHz or 40 MHz channel numbering to
identify a channel numbering scheme for the graph.
This parameter is not configurable for graphs created by hybrid APs or spectrum monitor radios that use the
2.4 GHz radio band.
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 will 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.