nanog mailing list archives

Re: 2.4Ghz 40Mhz 802.11n wifi and Apple Macbook


From: Colton Conor <colton.conor () gmail com>
Date: Mon, 15 Jun 2015 13:17:52 -0500

So assuming you live in a decent sized house/lot, should you really care
about squatting all over the entire band? I mean sure I can see my
neighbors wifi signals, but they are too weak for me to connect with them.
So wouldn't mine be just as weak at their location, so why should I care
about using the entire band? Aren't I really only using 2/3 of the band by
going to 40Mhz, leaving an entire 20Mhz wide channel free for my neighbors
AP to switch over to?

I see substantial improvements in going from 20 to 40 Mhz from smartphone's
that have 1X1 fixed antennas which is every smartphone. Going from 20 Mhz
with a max theoretical of 72.2Mbps to 40 Mhz with a max theoretical of
150Mbps is a big difference. Especially when you typically only get half of
the max theoretical speed.

On Mon, Jun 15, 2015 at 12:39 PM, Brielle Bruns <bruns () 2mbit com> wrote:

On 6/14/15 9:56 PM, Alexander Maassen wrote:

Shoot me if i'm wrong, but doesn't a mac prefer MIMO in order to work
correctly?


You still get a nice performance boost with 802.11b/g/n in 2.4 range even
at 20mhz, but if you go to 40mhz, you'll be splattering all over the entire
2.4 band.

This is why all of the pre-N performance enhancements for G were
troublemakers if you had multiple wireless networks in the same area. You
turn it on, and one of two things happen - you either wreck performance of
everyone else on that band, or everyone else wrecks your performance.


--
Brielle Bruns
The Summit Open Source Development Group
http://www.sosdg.org    /     http://www.ahbl.org



Current thread: