40MHz on 2.4 is note widely supported, and for good reason - it sucks up the entire unlicensed 2.4GHz band (if you include the 802.12 mask).
On 5GHz, 20/40 are supported, and 80/160 in current and future versions of 802.11ac. On Jun 14, 2015 7:56 PM, Alexander Maassen <outsi...@scarynet.org> wrote: > > Shoot me if i'm wrong, but doesn't a mac prefer MIMO in order to work > correctly? > > On Sun, June 14, 2015 8:42 pm, Brielle Bruns wrote: > > On 6/14/15 12:33 PM, Anurag Bhatia wrote: > >> Hello everyone, > >> > >> > >> > >> I am running a TP Link TL-WR1043N which (as TP Link says is a) 802.11n > >> router working on 2.4Ghz (no support for 5Ghz). I am running it with > >> flashed OpenWRT. > >> > >> > >> > >> While using option to pick 40Mhz, I see my Mac only gets 20Mhz to use > >> and > >> speed is always 130Mbps. There's no other SSID nearby and I am sitting > >> next > >> to router for testing. > >> > >> > >> This brings me to question - Has anyone successfully used 40Mhz with > >> 2.4Ghz > >> on 802.11n standard with Apple Macbook? I wonder if it's limitation on > >> the > >> chipset or something else. > >> > >> > >> > > > > Everything that I've seen/experienced says that Apple devices won't use > > 40mhz channels with 2.4 due to the overlapping bands/lack of good > > separation between channels. > > > > However, I'm not sure if this specifically applies to just the Airport > > APs like the Extreme, or to the laptops as well, as I use AE's at home, > > and the Unifi APs I do have in service all have 20mhz channels only set > > on them to avoid issues. > > > > > > -- > > Brielle Bruns > > The Summit Open Source Development Group > > http://www.sosdg.org / http://www.ahbl.org > > > >
