Figure 225: Quality Spectrogram

When you 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 spectrum monitor, and the channels affected by the device.

The following table describes the other optional parameters you can use to customize the Quality Spectrogram. 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

Table 226: Quality Spectrogram Options

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 lower to 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

For spectrum monitors using the 5 GHz radio band, select either 20 MHz or 40 MHz channel numbering to

Numbering

identify a channel numbering scheme for the graph.

 

NOTE: 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.

Channel Range

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.

Real-Time FFT

The Real-time FFT chart displays 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 frequency domain representation divides RF signals into discrete frequency bins; small frequency ranges whose width depends on the resolution bandwidth of the spectrum monitor (i.e., how many Hz are represented by a single signal strength value). Each frequency bin has a corresponding signal strength value. Since 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.

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