Spectrum Intelligence Details
The Spectrum Intelligence data panel contains the following
information:
Status Bar
The Status Bar at the top of the panel displays the current
analysis parameters, including which AP or APs are running the scan, the channels,
run time, and band (2.4 GHz or 5 GHz). You can change these settings for each and
then select Apply.
Below the Status Bar, on the right side of the panel you will see the time remaining
in the current scan. Select
Stop to end the current
analysis.
Note
Spectrum analysis automatically shuts down after 30
minutes.
Data Collect Interval: The data collection interval refers to
the time interval between scans of the spectrum. Each time the AP scans the
spectrum, it updates the display. If the data collection interval is five seconds,
then the AP scans every five seconds and updates the display. You can change the
interval from 1 to 30 seconds.
Graphical Analysis Feedback
This area displays graphs of the received signals, arranged by default in a
two-by-two array. Use the expand and collapse arrows in the upper right corner of
each graph to enlarge or reduce the graph for visibility.
- Real-time FFT: The real-time FFT trace indicates the
power of a signal (vertical axis) along a domain of frequencies (horizontal
axis).
- FFT Duty Cycle: The FFT duty cycle is the amount of time
as a percent of total time that the AP receives a signal 20 dB or more above the
noise floor. The FFT duty cycle is often referred to as channel utilization
because it indicates to what extent a channel is actually in use in terms of the
relative amount of time the signal is present (vertical axis).
- Swept Spectrogram: A swept spectrogram tracks the signal
power over time. It produces a color-coded sweep of spectral information that
shows the real time FFT in terms of its historical values. The swept
spectrogram—also called a heat map—reports the frequency on the horizontal axis,
the history (in sweeps) on the vertical axis, and the power encoded as a set of
colors.
- Swept Spectrogram-FFT Duty Cycle: A swept spectrogram of
the FFT duty cycle tracks the duty cycle over time. This spectrogram produces a
color-coded sweep of duty cycle information with frequency on the horizontal
axis, history (in sweeps) on the vertical axis, and the duty cycle encoded as a
set of colors.
Interference Reporting
The Interference Signature table below the graphs displays any sources of RF
interference that the spectrum analyzer can identify. This area provides a summary
of all interference sources for quick review. This area contains six columns to help
identify the affected channels and the approximate position of the interference.
- Extreme Device Name: The name of the AP that is reporting
the interference. If an interference source is reported by a few APs, but not
others, you can use this to approximate the physical location of the
interference.
- Device Function: Indicates the device type of the
interferer, such as a cordless phone, microwave oven, or video bridge. The
device type listing can help determine whether the interference source might be
a security concern.
- Discovered: Shows the date and time that the AP
discovered the source of the interference. You can track regular, periodic, and
intermittent interference sources using this information.
- Channel Affected: When ExtremeCloud IQ identifies an
interference source, the channel in which it occurs displays here.
- Center Frequency: The center frequency is the midpoint
between upper and lower frequency band cutoff.
- Occupied Bandwidth: This column displays the bandwidth of
the affected range of frequencies.
The last three columns contain redundant information and provide the same information
from different perspectives so that you can gain a more a complete understanding of
the affected frequencies and channels.
Neighboring APs
A table displays a list of neighbor APs.
