User's Guide

There are two scanning modes:
• Full Scan
• Interference Scan
Full Scan scans the entire 2.4GHz bandwidth (in 5MHz steps) and 5GHz bandwidth (in 20MHz steps)
with a short dwell time (around 50 ms). It supports limited classification of interference sources.
Interference Scan scans three frequencies in the 2.4GHz band and three frequencies in the 5GHz band
with a longer dwell time (around 500 ms). It supports classification for all interference sources. To select
a mode, select the appropriate radio button or select a mode from the Scan menu.
Spectrogram
Spectrogram shows the average power level measured at each of the frequencies in the scan settings
over a period of time. The graph is cleared when a scan starts and updates regularly as data becomes
available during the scan.
When a scan starts, data starts showing in the right side of the graph. As new data is scanned, the older
data moves to the left. Once the graph is full, a horizontal scroll bar becomes visible.
You can display the frequency and power value by moving the cursor over points in the graph.
The Duty Cycle chart shows the duty cycle values for the most recent time slice and an average of the
duty cycles across all time slices. When the cursor is placed over the Duty Cycle chart, the frequency
and duty value is highlighted and displayed. Also, the status bar displays the frequency, duty value,
average power, and average pulse power.
You can adjust the size of the Spectrogram and Duty Cycle chart by clicking and dragging the divider
(left or right) between them. The size of the charts may be adjusted along the X axis by dragging a
divider which is shown between the spectrogram and the duty cycle chart.
Interference Sources
The Interference Sources table lists:
• Whether the interference source is active (red ball) at the moment or not (gray ball)
Note
An alarm is generated whenever an interference source is detected.
• The name of the interference source:
◦ Microwave Oven
◦ Frequency Hopping
◦ Continuous Wave
◦ Bluetooth
• The frequency of the interference source
• The power of the interference source
• The time when the interference source was first detected.
Each time a scan is started, the table clears and is updated when data becomes available.
Configuration
Tab Device Functions Requiring More Explanation
Extreme AirDefense User Guide for version 10.5. 793