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    Sam Drazin
    Scanning the 2.4 GHz Spectrum
    Topic posted November 11, 2011 by Sam DrazinExpert, last edited December 6, 2013 by AdminProficient, tagged how-to 
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    Title:
    Scanning the 2.4 GHz Spectrum
    Description:

    Overview

    With the AXT610 Wireless Access Point, you can scan the 2.4 GHz spectrum. This will be helpful in diagnosing how your Axient system's ShowLink network will handle in a certain venue, as well as getting a general feel for the RF traffic in that range.

    Related Links

    Required Materials

    In order to scan the 2.4 GHz spectrum, you will need an AXT610 Wireless Access Point. To power the AXT610, it will either need to be connected to an ethernet port that has Power over Ethernet (PoE), or externally powered with it's own power supply.

    ShowLink Plot

    The ShowLink Plot is Wireless Workbench's utility which allows you to scan the 2.4 GHz spectrum, save scans as files, and open old scans to review.

    First, ensure that your AXT610 is online. You will see it populated in the ShowLink Access Point section of the inventory. This is the device that will scan the 2.4 GHz spectrum.

    9b7e885515_01.png

    To access this plot, from the global menu bar, select "ShowLink Plot".

    9b7e885515_02.png

    The ShowLink Plot opens.

    9b7e885515_03.png

    From the left sidebar, select "Add Access Point..." to view all available AXT610s on the network, and check the one you want to use to scan. Press "Save" to add the Access Point as a scanner.

    9b7e885515_04.png

    The Device ID of the Access Point that you added will now show up in the "Access Point:" section in the left sidebar of the ShowLink Plot. This confirms that the device is ready to be used as a scanner.

    9b7e885515_05.png

    To begin the scan of the 2.4 GHz spectrum, ensure that the Device ID of the Access Point is selected in the drop-down of available Access Points. Press "Start" to begin the scan.

    9b7e885515_06.png

    As the Access Point begins to scan, you will see two plot areas populate with data.

    The bottom plot window shows the real-time scan data, marked by the green plot lines.

    9b7e885515_07.png

    The following overlays are displayed and can be toggled by de/selecting them from the Overlays section on the left sidebar:

    • The red overlay represents the Peak Hold of RF levels for the entire length of the scan
    • The yellow overlay represents the average RF levels for the entire length of the scan

    The top section of the plot shows a history of the real-time scans, where time is displayed on the Y (vertical) axis.

    9b7e885515_08.png

    Each pass of the scan adds another horizontal slice to the top of the scrolling scan. Higher energy seen in the spectrum will result in warmer colors being displayed. Use the legend on the top right to gauge how strong of a signal is being seen by the Access Point.

    Other Elements of the Plot

    Notice that there is a wide marker labeled with the Device ID of your online Access Point. This marker indicates your Access Point's channel assignment within the 2.4 GHz spectrum. The channel settings for an Access Point can be configured from the Properties panel of the AXT610.

    9b7e885515_09.png

    There is a zoom bar at the top of the plot as well, which allows you to narrow in on a range of the spectrum to have a closer look with higher resolution.

    A time slider and play/stop controls at the bottom of the plot window allow you to scroll through and progress through the captured scan data.

    9b7e885515_10.png

    Saving a Scan

    Once your scan is complete, press "Stop" on the left sidebar to end the scan.

    9b7e885515_11.png

    The data for your scan currently lives in the active Wireless Workbench session. To save it to a file, right-click on the Device ID of your scanner listed in the top left within the "Access Point:" section, and select "Save...".

    9b7e885515_12.png

    Save your scan file. This file can now be sent via email, or saved to external memory devices and brought to other instances of Wireless Workbench.

    To import a scan file, select the Open folder icon underneath the "Files:" section on the left sidebar. Browse to your file, and select open.

    9b7e885515_13.png

    Once imported, you will be able to view your scan file and browse through each pass of the scan, using the time slider at the bottom of the plot window.

    9b7e885515_14.png

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