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  1. #1
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    Readers disagree with Wi-Fi troubleshooting tips




    LANGALIST PLUS


    Readers disagree with Wi-Fi troubleshooting tips



    By Fred Langa

    Some LangaList Plus readers took exception to Wi-Fi advice given in a recent column. I reply. Plus: Modifying Internet Explorer's toolbars, dual-booting Windows 7 and 8, and handling mandatory sign-ins to public hotspots.


    The full text of this column is posted at windowssecrets.com/langalist-plus/readers-disagree-with-wi-fi-troubleshooting-tips/ (paid content, opens in a new window/tab).

    Columnists typically cannot reply to comments here, but do incorporate the best tips into future columns.

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  3. #2
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    Fred, you are right on-target with your channel comments.

    First, modern 802.11 is implemented with OFDM modulation, which essentially distributes the data across many carriers within a channel and is somewhat more tolerant of interference when the channels overlap. Also, modern schemes to increase throughput now use "channels" that are much broader (40 MHz, for example) than the original 20 or 22 MHz allocations, so while the channel 1, 6, 11 allocations may have made sense at one time, that info is not as important now. It's complicated, and this note is a great simplification. The bottom line: Use whatever channels work for a particular installation.

    I do have a small correction to make, though. Channels 12, 13, and 14 are not for "special WiFi applications." They are not allowed in North America at all in the 2.4 GHz ISM band. This has to do with international agreements on spectrum usage. Some other parts of the world allow the frequencies.

    A very quick web search brings up the following, which might be helpful:
    https://en.wikipedia.org/wiki/List_of_WLAN_channels
    https://en.wikipedia.org/wiki/IEEE_802.11
    http://airmagnet.flukenetworks.com/a....11nPrimer.pdf

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