Does the mac book pro tell a WAP to power back?

Discussion in 'Wireless Internet' started by T, Jun 27, 2015.

  1. T

    T Guest

    Hi All,

    I have a customer with a Mac Book Pro. On two separate Netgear
    "router/hub/Wireless Access Points", after changing the wireless
    channel, about five minutes later the (radio strength) power
    levels drops from the max of five bars to two. Is the Mac Book
    Pro telling the router to do this? Is there some feedback
    mechanize in play to keep your signal from going down the street?


    The customer also has an iPad and an Android phone on the network.
    T, Jun 27, 2015
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  2. T

    aaron Guest

    I don't know about Netgear, but there is no mechanism with which *our* APs
    will reduce our transmit power based upon what the client tells us (per se.)
    So I really can't guess what's going on. (The converse is not true, btw -
    there *are* protocols by which our APs may tell clients to change their transmit

    Let's say that you were to install WiFi Analyzer or similar on your Android
    phone, and put the Android phone next to your Mac, and lock the Android onto
    the AP of interest ("Signal Meter"). Then do your thing with the Mac. Do
    find that, at the time when the Mac reports a drop from five bars to two, the
    Signal Meter RSSI also drops?

    aaron, Jun 29, 2015
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  3. T

    T Guest

    Hi Aaron,

    The bars drop on all three devices (Mac Book Pro, Android,
    iPad). The customer has a fancy app on the android that
    shows strength of everyone around you.

    My first thought was a feedback mechanism like that used
    on cell phones.

    In the mean time I have found this in Netgear's manual:

    3. (Optional) Clear the Enable 20/40 MHz Coexistence check
    box to increase the wireless speed to the maximum supported
    speed. By default, 20/40 MHz coexistence is enabled to
    prevent interference between wireless network in your
    environment at the expense of the wireless speed. If there
    are no other wireless networks in your environments, you
    can clear the Enable 20/40 MHz Coexistence check box.

    Hmmmm. I am thinking that reading between the lines, if the router
    see a lot of other APs nearby, that it reduces its power to assist
    with congestion. And this customer has about 11 AP's showing up
    from his neighbors as he lives in a crowded community.

    And, both routers were Netgear. And this is the most congestion
    I have seen with a Netgear router. (I have seen worse at an apartment
    complex with another router.)

    What do you think?

    Thank you for helping me with this.

    T, Jun 29, 2015
  4. T

    aaron Guest

    I wouldn't expect this to have an effect on transmit power.
    That's conceivable. I've not ever known any APs (unless under direction
    from some central controller) to voluntarily step down their power ... but
    it would be nice if they did.

    Again, I'm afraid that I have no recent experience with Netgear.

    Good luck,

    aaron, Jul 6, 2015
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