[161072] in North American Network Operators' Group
Re: 10 Mbit/s problem in your network
daemon@ATHENA.MIT.EDU (Owen DeLong)
Mon Feb 25 12:01:20 2013
From: Owen DeLong <owen@delong.com>
In-Reply-To: <cx8po8q29hyi4a4rhhmfdub0.1361810517282@email.android.com>
Date: Mon, 25 Feb 2013 08:56:05 -0800
To: Warren Bailey <wbailey@satelliteintelligencegroup.com>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
N has a number of advantages=85 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@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.=20
>=20
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> =46rom my Android phone on T-Mobile. The first nationwide 4G network.
>=20
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> -------- Original message --------
> From: Owen DeLong <owen@delong.com>=20
> Date: 02/25/2013 8:38 AM (GMT-08:00)=20
> To: Frank Bulk <frnkblk@iname.com>=20
> Cc: NANOG <nanog@nanog.org>=20
> Subject: Re: 10 Mbit/s problem in your network=20
>=20
>=20
> Correct. However, while A is 5Ghz (only), it's not significantly =
better than G.
>=20
> 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.
>=20
> Owen
>=20
> On Feb 24, 2013, at 8:56 PM, "Frank Bulk" <frnkblk@iname.com> wrote:
>=20
> > The IEEE 802.11n standards do not require 5 GHz support. It's =
typical, but
> > not necessary.
> >=20
> > Frank
> >=20
> > -----Original Message-----
> > From: Owen DeLong [mailto:owen@delong.com]=20
> > Sent: Sunday, February 17, 2013 2:07 PM
> > To: Jay Ashworth
> > Cc: NANOG
> > Subject: Re: 10 Mbit/s problem in your network
> >=20
> >=20
> > On Feb 17, 2013, at 08:33 , Jay Ashworth <jra@baylink.com> wrote:
> >=20
> >> ----- Original Message -----
> >>> From: "Scott Howard" <scott@doc.net.au>
> >>=20
> >>>> 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.
> >>>=20
> >>> The chances of the average hotel wifi user even knowing what SSH =
means
> >>> is close to zero.=20
> >>=20
> >> {{citation-needed}}
> >>=20
> >>> 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...
> >>=20
> >> 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=20
> >> current-gen business laptops (my x61 is almost 5 years old, and =
speaks A).
> >>=20
> >=20
> > 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.
> >=20
> > Owen
> >=20
> >=20
> >=20
> >
