601| Spectrum Analysis DellPowerConnect W- Series ArubaOS 6.2 | User Guide
Figure 225: Quality Spectrogram
Whenyou hover your mouse over any part of the spectrogram, a tooltip shows the devices the spectrum monitor
detected on that frequency,the BSSID of the device (if applicable), the power level of the device in dBm, the time
the device was last seen by the spectrummonit or,and the channels affected by the device.
The followingtable describes the other optional parameters you can use to customize the Quality Spectrogram. Click
the down arrowi n theupper right corner of this chart then click the Options menu to access these configuration
settings. Once you have configuredthe desired parameters, click OK at the bottom of t heOptions menu to save
your settings and returnt o the spectrum dashboards
Parameter Description
Band Radio band displayed in this graph.
Forspectrum moni tor radios using the 5 GHz radio band, cli ck the Banddr op-down list and select 5 GHz
upper,5GHzmiddl e or 5Ghzl ower to display datafor that portion of the 5Ghzradio band. This parameter
isnot configurabl e for graphs created by hybrid APs or spectrum monitor radios that use the 2.4 GHz radio
band.
Channel
Numbering
Forspectrum moni torsusing the 5 GHz radio band, select either 20 MHz or 40 MHz channel numberi ng to
identifya channel num bering scheme for thegraph.
NOTE:Thi s parameter is not configurable for graphs created by hybrid APs or spectrum moni torr adios
thatuse the 2.4 GHz radio band. A hybrid AP on a 20 MHz channel sees 40MHz Wi -Fi dataas non-Wi -Fi
data.
Channel Range Specifya channel range to determine which channels appear in the x-axis of this chart. Click the first
drop-down list toselect the lowest channel in the range, then cli ckthe second drop-down li stto select
thehighest channel to appear in the chart.
NOTE:Thi s parameter is not configurable for graphs created by hybrid APs.

Table22 6:

QualitySpectrogramOptions

Real-Time FFT
The Real-time FFT chartdisplays the instantaneous Fast Fourier Transform (FFT) signature of the RF signal seen
by the radio. The Fast Fourier Transform (FFT) converts a RF signal from time domain to frequency domain. The
frequencydomain representation divides RF signals into discrete frequencybins; small frequencyranges whose width
dependson the resolution bandwidth of the spectrum monitor (i.e., how many Hz are representedby a single signal
strengthvalue). Each frequency bin has a corresponding signal strength value.Since there may be a large number of
FFT signaturesreceived by the radio every second, an algorithm selects one FFT sample to display in the Real-time
FFT chartevery second.