10 Mbit/s problem in your network

Mon Feb 25 16:56:05 UTC 2013

N has a number of advantages… Better spread, the ability to take advantage of polarization, better use of MIMO, and IIRC, a better encoding scheme that allows denser constellation points (more bits per signaling element).

N on 5Ghz takes advantage of the increased bandwidth of the 5Ghz channel where A merely replicated G on 5Ghz for all practical purposes.

Owen

On Feb 25, 2013, at 8:42 AM, Warren Bailey <wbailey at satelliteintelligencegroup.com> wrote:

> I should probably know this, but doesn't N just spread better and have the ability to send receive on multiple polarizations? As an RF engineer I should probably know this, but I can't think of many people in my industry who really care about 802.11_. I really don't even use wireless in my house, though it's generally due to overcrowding the spectrum in populous areas. 
> 
> 
> From my Android phone on T-Mobile. The first nationwide 4G network.
> 
> 
> 
> -------- Original message --------
> From: Owen DeLong <owen at delong.com> 
> Date: 02/25/2013 8:38 AM (GMT-08:00) 
> To: Frank Bulk <frnkblk at iname.com> 
> Cc: NANOG <nanog at nanog.org> 
> Subject: Re: 10 Mbit/s problem in your network 
> 
> 
> Correct. However, while A is 5Ghz (only), it's not significantly better than G.
> 
> The true performance gains come from 5Ghz and N together. N on 2.4Ghz has
> limited benefit over G. N on 5Ghz is significantly better.
> 
> Owen
> 
> On Feb 24, 2013, at 8:56 PM, "Frank Bulk" <frnkblk at iname.com> wrote:
> 
> > The IEEE 802.11n standards do not require 5 GHz support.  It's typical, but
> > not necessary.
> > 
> > Frank
> > 
> > -----Original Message-----
> > From: Owen DeLong [mailto:owen at delong.com] 
> > Sent: Sunday, February 17, 2013 2:07 PM
> > To: Jay Ashworth
> > Cc: NANOG
> > Subject: Re: 10 Mbit/s problem in your network
> > 
> > 
> > On Feb 17, 2013, at 08:33 , Jay Ashworth <jra at baylink.com> wrote:
> > 
> >> ----- Original Message -----
> >>> From: "Scott Howard" <scott at doc.net.au>
> >> 
> >>>> A VPN or SSH session (which is what most hotel guests traveling for
> >>>> work will do) won't cache at all well, so this is a very bad idea.
> >>>> Might improve some things, but not the really important ones.
> >>> 
> >>> The chances of the average hotel wifi user even knowing what SSH means
> >>> is close to zero. 
> >> 
> >> {{citation-needed}}
> >> 
> >>> As an aside, I was sitting in JFK airport (terminal 4) a few days ago and
> >>> having a shocking time getting a good internet connection - even from my
> >>> own Mifi. I fired up inSSIDer, and within a few seconds it had detected
> >>> 122 AP's...
> >> 
> >> Yup; B/G/N congestion is a real problem.  Nice that the latest generation
> >> of both mifi's and cellphones all seem to do A as well, in addition to 
> >> current-gen business laptops (my x61 is almost 5 years old, and speaks A).
> >> 
> > 
> > I think by A you actually mean 5Ghz N. A doesn't do much better than G,
> > though
> > you still have the advantage of wider channels and less frequency congestion
> > with other uses.
> > 
> > Owen
> > 
> > 
> > 
> >