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The U-NII Bands

12 posts by 6 authors in: Forums > Wi-Fi Alliance Certifications & the 802.11 Standard
Last Post: February 7, 2008:
  • By MuraliMohan
    Reply

    Hi All,

    I have a small doubt regarding this.

    Regulatory domains have changed in past and will change in future.

    How can an AP (Access point) vendor ensure compatability ?

    Old cards may not be able to connect to AP if it selects new channel.

    With regards,
    Murali

  • By Devinator
    Reply

    Hi Murali,

    Fortunately, since 1999, starting with the 802.11-1999 standard, regulatory domain frequency sets have grown, not shrunk or moved. We started with 2.4 GHz (2.4000 to 2.4835 GHz) and then suddenly had UNII-1 (5.15-5.25 GHz), UNII-2 (5.25-5.35GHz), and UNII-3 (5.725-5.825 GHz) with 802.11a.

    Next came the 5.8GHz ISM band, where we could use 5.725-5.850GHz) in some equipment.

    Then came UNII-2e, which gave us 11 more channels in the 5.470-5.725GHz space. It just keeps expanding.

    If the WLAN infrastructure is using a channel not supported by the radio chipset in the client adapter, you have no option but to replace the client adapter.

    Devinator

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