[151732] in North American Network Operators' Group
Re: airFiber (text of the 8 minute video)
daemon@ATHENA.MIT.EDU (Joel jaeggli)
Thu Mar 29 17:38:24 2012
Date: Thu, 29 Mar 2012 23:37:24 +0200
From: Joel jaeggli <joelja@bogus.com>
To: Jonathan Lassoff <jof@thejof.com>
In-Reply-To: <CAHsqw9urg1c2errVS7sZ0Wq0B6ELOK3WjO1HgNV+CB3aaL_OHg@mail.gmail.com>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 3/29/12 21:53 , Jonathan Lassoff wrote:
> On Thu, Mar 29, 2012 at 12:33 PM, Oliver Garraux <oliver@g.garraux.net> wrote:
>> I was at Ubiquiti's conference. I don't disagree with what you're
>> saying. Ubiquiti's take on it seemed to be that 24 Ghz would likely
>> never be used to the extent that 2.4 / 5.8 is. They are seeing 24 Ghz
>> as only for backhaul - no connections to end users.
>
> I suspect this is just due to cost and practicality. ISPs, nor users
> will want to pay 3k USD, nor widely utilize a service that requires
> near-direct LOS.
> I could see this working well in rural or sparse areas that might not
> mind the transceiver.
Cost will continue to drop, fact of the matter is the beam width is
rather narrow and they attenuate rather well so you can have a fair
number of them deployed without co-channel interference. if you pack a
tower full of them you're going to have issues.
>> I guess
>> point-to-multipoint connections aren't permitted by the FCC for 24
>> Ghz.
>
> The whole point of these unlicensed bands is that their usage is not
> tightly controlled. I imagine hardware for use still should comply
> with FCC's part 15 rules though.
>
>> AirFiber appears to be fairly highly directional. It needs to
>> be though, as each link uses 100 Mhz, and there's only 250 Mhz
>> available @ 24 Ghz.
>
> Being so directional, I'm not sure that cross-talk will as much of an
> issue, except for dense hub-like sites. It sounds like there's some
> novel application of using GPS timing to make the radios spectrally
> orthogonal -- that's pretty cool. If they can somehow coordinate
> timing across point-to-point links, that would be great for sites that
> co-locate multiple link terminations.
>
> Overall, this looks like a pretty cool product!
>
> --j
>
>
