Extreme Networks Summit WMScanner User Manual page 80

Measurement Surveys
In 20 MHz mode, only APs working in the 20 MHz channel width are detected. Setting the
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advanced Channel Width Settings option detects 40 MHz APs while scanning for channels with 20
MHz channel width. This option is disabled by default when the channel width is set to 20/40 MHz
or 40 MHz.
In 40 MHz mode, you can specify the exact extension channel to be used. This option is disabled by
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default for other modes. The options available are +1 and -1, therefore, scanning takes place only in
the 40 MHz channel width and not in 20 MHz for a selected channel. Thus, an AP is detected only if
it works on that 40 MHz channel.
In 20/40 MHz mode, you need to specify only the primary channel to be scanned. The software
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automatically adds scanning for all possible configurations of extension channels for that primary
channel. Thus in 20/40 MHz mode, each selected primary channel can essentially represent up to
three separate scans, one for 20 MHz, one for extension channel +1, and one for extension channel -1
(both for 40 MHz). Packets are recorded if the AP configuration is the same as the scanning
configuration.
The Configure Scan Settings dialog box provides precise control over the time that Summit
WMScanner spends on each channel for all valid Air Interface Standard channels in WLAN. Use this
feature to focus the survey on specific access point channels.
1 Select the desired options, and click the OK button. The Configure Real-Time Measurement Run
Information dialog box appears.
2 Click the Next button, and then select the measurement WLAN adapter.
NOTE
Make sure the adapter is not being used for network connection if the adapter is set for scanning.
3 Click the OK button. The bottom pane of the drawing map is divided into two parts.
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Summit WMScanner Users Guide