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WifiSleuth Screenshots
Below are sample screenshots from WifiSleuth. They are divided into two categories: 2.4 GHz Spectrum Analysis and 802.11 Network Discovery. The data acquired and analyzed for spectrum analysis uses the wireless device that was shipped with the Sleuth product, while the data displayed for 802.11 network discovery (i.e. Wi-Fi Scanning) uses your 802.11 wireless adapter. All Sleuth products (i.e. AirSleuth-Pro, AirSleuth-Lite and WifiSleuth) support all features and charts associated with 802.11 network discovery.
For certain charts, the 2.4 GHz spectrum analysis module used by WifiSleuth employs what we refer to as "channel-centric" diagnostic views. In contrast to a typical spectrum trace that plots signal strength along the y-axis and frequency along the x-axis, a channel-centric chart replaces frequency with 802.11 channels along the x-axis. This can be seen in 2 charts below: Channel Spectrogram and Channel Timecourse. The 802.11 network discovery module creates charts that are similar in appearance but use different data and have a different interpretation. The distinction between 2.4 GHz spectrum analysis and 802.11 network discovery is an important one to make -- in spectrum analysis we are talking about raw, RF energy, whereas in 802.11 network discovery we are talking about the signal strength of the beacon transmitted by an access point.
The channel-centric views calculated by the spectrum analysis module integrates (as in calculus) or sums all the RF energy for the range of frequencies that fall under each channel. Since Wi-Fi channels overlap then the RF energy detected for a particular frequency will contribute to more than one channel. The result of integrating the RF energy under the frequency spectrum and distributing this among the different channels allows us to create channel-centric views of the raw, RF energy as detected by our wireless device.
In 802.11 network discovery the 802.11 wireless adapter only sees 802.11 beacons -- it does not see raw RF energy. The charts created by the 802.11 network discovery module use only beacon strengths as reported by your 802.11 wireless adapter.
So, when reviewing the charts created by the spectrum analysis and 802.11 network discovery modules it important to keep in mind which data is used in the graph -- raw, RF data or beacon strengths.
2.4 GHz Spectrum Analysis
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Channel
Spectrogram View Description: This view is a 3D chart of Wi-Fi (802.11) channels as a function of time. Each channel is represented by its own set of bar graphs -- the z-axis is time and the y-axis is signal strength. As with the Channel Timecourse view, the Spectrogram view makes it easy to visualize how RF interference affects different Wi-Fi channels over time. |
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Channel
Timecourse View Description: This view is useful for monitoring the Wi-Fi (802.11) channels as a function of time. Each channel is represented by a different line -- the x-axis is time and the y-axis is signal strength. In this way one can clearly follow how RF interference affects different Wi-Fi channels over time. |
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Best Channel View Description: A proprietary algorithm ranks the Wi-Fi channels in real-time from least to most noisy. You can set-up the analyzer and let it run for an extended period and when you are done the Best WiFi Channel will tell you, overall, which is the best channel to use for the access point that services that particular location. |
802.11 Network Discovery
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Grid of Access
Points Description: This grid of local access points is updated in (semi) realtime -- that is, scans are performed approximately once every 5 seconds. |
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Timecourse of
Beacon Qualities For Each Access Point Description: This chart displays the beacon strength of each access point as a function of time. The Y-axis reports the signal strength as a signal quality (0 - 100%) -- where a maximum signal is assumed to be -20 dBm and the dissociation signal is -85 dBm (http://www.ces.clemson.edu/linux/dbm-rssi.shtml). |
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Differential
Display of Beacon Qualities For Each Access Point Description: This chart displays the current beacon strength of each access point compared with an earlier snapshot. The current beacon strength is displayed in purple, the snapshot in light-blue, and the difference in olive green. |
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Usage of Each
of the 802.11 b/g Channels Description: This chart combines the access points by channel and displays a summary of channel usage. As in most of the other charts, the Y-axis reports the signal strength of beacons as a signal quality (0 - 100%). In this view the data for each channel represents a collection of access points -- hence the signal quality as displayed along the Y-axis is often greater than 100%. This is because we are summing the signal qualities for each of the access points that use a particular channel. |
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Timecourse of
the Usage of Each of the 802.11 b/g Channels Description: This chart combines the access points by channel and displays a summary of channel usage as a function of time. As in most of the other charts, the Y-axis reports the signal strength of beacons as a signal quality (0 - 100%). In this view the data for each channel represents a collection of access points -- hence the signal quality as displayed along the Y-axis is often greater than 100%. This is because we are summing the signal qualities for each of the access points that use a particular channel. |
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Heatmap Chart
of the 802.11 b/g Channels Description: This chart combines the access points by channel and displays a summary of channel usage as a Heatmap. The Heatmap chart is also known as a "waterfall" graph. It is a 3-dimensional representation of the data, where the X-axis is the channel, the Y-axis is a time scale, and the "Z-axis" is the beacon signal quality that uses color scale. Each horizontal line in the Heatmap chart displays beacon signal strength (as a color) as a function of channel as measured over the time period of one scan. That is, with each scan (or sweep) a new row is added at the bottom of the Heatmap chart. The color legend to the right shows that stronger signals will appear red and weaker signals will appear blue. |
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Channel
Spectrogram of the 802.11 b/g Channels Description: The Channel Spectrogram chart is a 3D view of channel usage as a function of time. Each channel is represented by its own set of bar graphs -- the X-axis is the channel, the Z-axis is a time scale, and the Y-axis reports the signal strength of beacons as a signal quality (0 - 100%). In this view the data for each channel represents a collection of access points -- hence the signal quality as displayed along the Y-axis is often greater than 100%. This is because we are summing the signal qualities for each of the access points that use a particular channel. |
