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How can loads of 2.4Ghz routers work in a city center for example?

  • 14-06-2015 11:08am
    #1
    euser1984
    Registered Users, Registered Users 2 Posts: 1,977 ✭✭✭


    Take new york or dublin city, or any metropolitan area actually....how can these networks work in tandem given that there are a limited number of configurable channels available?

    Thanks.


Comments

  • #2
    mass_debater
    Closed Accounts Posts: 3,072 ✭✭✭mass_debater


    euser1984 wrote: »
    Take new york or dublin city, or any metropolitan area actually....how can these networks work in tandem given that there are a limited number of configurable channels available?

    Thanks.

    They don't, there's lots of interference on 2.4ghz in built up areas. This is one of the reasons for the move towards 5ghz, 5ghz has many more channels and they don't overlap. The drawback is that 5ghz will only have about half the range, which is why we see dual band being used


  • #3
    euser1984
    Registered Users, Registered Users 2 Posts: 1,977 ✭✭✭euser1984


    mass_debater wrote: »
    They don't, there's lots of interference on 2.4ghz in built up areas. This is one of the reasons for the move towards 5ghz, 5ghz has many more channels and they don't overlap. The drawback is that 5ghz will only have about half the range, which is why we see dual band being used

    Oh right, I thought 5Ghz was relatively new....


  • #4
    gctest50
    Registered Users, Registered Users 2 Posts: 9,605 ✭✭✭gctest50


    have a look for :

    csma / ca backoff

    rts / cts

    the "hidden node" problem


    basically it waits a random amount of time to try to "talk" again


  • #5
    ED E
    Registered Users, Registered Users 2 Posts: 36,170 ✭✭✭✭ED E


    You have to remember that 802.11 radios are limited to 100mW nearly everywhere, so range is typically very low designed to specifically to facilitate high density use. Still useless in apartment blocks, but generally ok.


  • #6
    [Deleted User]
    Posts: 0 ✭ [Deleted User]


    mass_debater wrote: »
    They don't, there's lots of interference on 2.4ghz in built up areas. This is one of the reasons for the move towards 5ghz, 5ghz has many more channels and they don't overlap. The drawback is that 5ghz will only have about half the range, which is why we see dual band being used
    802.11ac might make this an issue again on 5 GHz as its adoption increases, the higher bandwidth has resulted in overlapping channels once again.


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