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Channel Overlapping - Might be useful info

Discussion in 'Networking Issues' started by tiagoespinha, Jul 7, 2006.

  1. tiagoespinha

    tiagoespinha Network Guru Member

    Well, I found this image published in another wireless community forum and decided to share it here. Not sure if it has been posted before, I did some search but couldn't find it so here it goes.

    The graph shows the frequencies (and the corresponding channels) that we can have without overlapping eachother at all, as well as all the other channels and with which they can overlap.

  2. Esquire

    Esquire Mesquire Staff Member Member

    Thanks for the diagram.

    It is fairly common knowledge that channels 1, 6 and 11 are non-overlapping, and everyone likes to keep treating this 3 channel set as absolute. What most people don't realize is that there are other non-overlapping channel sets, or have been ignoring their existence.
  3. ivo_1985

    ivo_1985 LI Guru Member

    So, what ? If around you is have few network working on 1,2,4, 5 6 channels? 1 and 6 are use almost everyone. So if you use 1 or 6 too, then is overlapping with many devices on 1,2,3,4,5 channels, or if you use 6, then is overlapping with 2,3,4,5,6. Then what ? I think FIRST to scan the air for network, then choise unused max clear channel, or minimum devices on that channel. Also you can go away as possible from used channels. Exampe: 1,2,4,6, - you can use 11,12,13,14. 1 and 6 aren't good choise. Am I right ? :thumb:
  4. Toxic

    Toxic Administrator Staff Member

    Thanks for the chart.

    1, 7 and 13 are better in EU for distance between frequencies.

    Overlapping channels are really only a worry for neighbourhoods with lots of wireless devices or setting up a wireless network where roaming is needed.
  5. tiagoespinha

    tiagoespinha Network Guru Member

    Yes, I guess the chart just takes those frequencies that would work worlwide, but those would be better in the EU standard. :)
  6. Toxic

    Toxic Administrator Staff Member

    Japan (14 channels:) ) however some countries in EU have less channels than the EU regulations say.
  7. Esquire

    Esquire Mesquire Staff Member Member

    A lot of this can be attributed to the manufacturer creating one firmware for the same AP model being sold everywhere, so they only enable 11 channels.

    Japanese AP models have Japanese firmware so they have 14 channels and are the exception

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