Dell W-7030 AOS 6.4.x User Guide - Page 811

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 (that is, how many Hz are represented by a single signal strength value). Each frequency bin has a corresponding signal strength value. 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 130 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 166 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. 811 | Spectrum Analysis Dell Networking W-Series ArubaOS 6.4.x | User Guide