[160887] in North American Network Operators' Group
Re: 10 Mbit/s problem in your network
daemon@ATHENA.MIT.EDU (Owen DeLong)
Mon Feb 18 18:55:37 2013
From: Owen DeLong <owen@delong.com>
In-Reply-To: <5122B43D.6070409@bogus.com>
Date: Mon, 18 Feb 2013 15:52:57 -0800
To: joel jaeggli <joelja@bogus.com>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Feb 18, 2013, at 3:07 PM, joel jaeggli <joelja@bogus.com> wrote:
> On 2/18/13 1:42 AM, Owen DeLong wrote:
>> On Feb 17, 2013, at 21:12 , Mikael Abrahamsson <swmike@swm.pp.se> =
wrote:
>>=20
>>> On Sun, 17 Feb 2013, Owen DeLong wrote:
>>>=20
>>>> Greater attenuation is an oversimplification.
>=20
> Along some dimensions sure, e.g. we have quite a lot of parameters we =
can fiddle with.
>=20
> With respect to an istropic raditor and the same power level it is =
not. It's about 6-7dB depending on which end of the bands we're =
comparing - e.g. friis trasmission equation.
Show me a wifi access point for 802.11n that uses an isotropic radiator =
and I'll consider that more relevant.
(Yes, I'm aware that an isotropic radiator is useful as a baseline =
comparison because it eliminates antenna issues, near-field/far field =
issues, and a host of other complications. However, the purpose of an =
isotropic radiator is, at its core, the very definition of =
oversimplification because it is a theoretical antenna which removes all =
of the real world complexities. To the best of my knowledge, nobody has =
ever actually built an isotropic radiator, though there are a couple of =
very complex antennas that come a little closer than a =BC wave whip.)
Owen
