configuration settings. Once you have configuredthe desired parameters, click OK at the bottom of the Options
menuto save your settings and return to 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
select5 GHz upper,5GHz middle or 5Ghz low er todi splaydata for that portion of the 5Ghzradio
band. This parameter is not configurable for graphs created by hybrid APs or spectrum m onitor
radiosthat use the 2.4 GHz radio band.
Channel Numbering Forspectrum moni torsusing the5 GHz radio band, select either 20 MHz or 40 MHz channel
numbering to identifya channel numberingscheme for the graph.
NOTE:Thi s parameter is not configurable for graphs created by hybrid APs or spectrum moni tor
radiosthat use the 2.4 GHz radio band.
X-Axis Selectei ther Channel or Frequency to show the dutycycle for a range of channels or
frequencies.
Channel Range Ifyou selected Channel in the X-Axis parameter, you must also specify a channel range to
determine which channels appear in the x-axis ofthis chart. Cl ick thefirst drop-down li stto
selectthe lowest channel in the range, then cli ckthe second drop-down li stto select the
highestchannel to appear in the chart.
NOTE:Thi s parameter is not configurable for graphs created by hybrid APs.
CenterFrequency Ifyou selected Frequency in the X-Axis parameter, enter the frequency, in MHz, thatyou want to
appeari n thecenter of the x-axis of this chart.
Span Ifyou selected Frequency in the X-Axis parameter, specify the size of the range of frequencies
aroundthe selected center frequency. If you seta frequency span of 100 MHz, for example, the
chartshows the FFT duty cycle for a range of frequenciesfrom 50MHz lower to 50 MHz higher
thanthe selected center.
Show Selecta checkbox todi splay thatinformation on the FFT Duty Cycle chart.
lDutyCycle: The per centageof duty cycle the channel orfrequency was actively utilized.
lMaxHold: Themaximum recorded percentage of active duty cycles forthe channel
frequencysince the chart was l astreset. To cl ear this setting, click the down arrow at the
endof the title bar for this graph and select Reset MaxHold.
lMaxof last sweeps: By default, this chart shows the m aximum percentage of active duty
cyclesfor the channel of frequency recorded during the last 10 sweeps. To change the
number ofsweeps used to determine this value, enter a number from 2 to 20, inclusive. To
clear thissetting, cli ckthe down arrow atthe end of the title bar forthis graph and select
ResetMaxNSweep.

Table22 2:

FFTDuty CycleOptions

Interference Power
The InterferencePower chart dis plays various power levelso f interest, includingthe Wi-Fi AP with maximum signal
strength,noise, and interferer types with maximum signal strength. The ACI displayed in the Interference Power
Chart is the ACI power level basedo nt hesi gnalstrength(s) of the Wi-Fi APs on adjacent channels. A higher ACI
valuei n InterferencePower Chart does not necessarily meanhigher interference since the AP t hat is contributing to
the maximumACI may or may not be very actively transmitting data to other clients at all times. TheA CI power
levelsare derived from the signal strength of the beacons.
This chart displays the noise floor of each selected channel in dBm. The noise floor of a channel depends on the
noise figure of the RF components used in the radio, temperature,presence of certain types o f interferersor noise,
and thew idth of the channel.For example,i n a cleanRF environment, a 20 MHz channel has a noise flooraround -
DellPowerConnect W- Series ArubaOS 6.2 | UserGuide SpectrumAnalysis | 598