User's Manual

735 | Spectrum Analysis Dell Networking W-Series ArubaOS 6.4.x| User Guide
Because 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 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.
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 shows 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 shows the types of devices seen on that frequency, and each device’s
BSSID, power level, channels affected and the time the device was last seen by the spectrum monitor.
Figure 120 Real-TIme FFT
This chart shows the maximum power level recorded for any device on all channels or frequencies monitored
by the spectrum monitor radio by default.
Table 147 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.
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.
Table 147: Real-Time FFT Options