[151817] in North American Network Operators' Group
Re: airFiber
daemon@ATHENA.MIT.EDU (Rubens Kuhl)
Sat Mar 31 09:03:34 2012
In-Reply-To: <20120329163421.GS14482@leitl.org>
Date: Sat, 31 Mar 2012 10:02:41 -0300
From: Rubens Kuhl <rubensk@gmail.com>
To: Nanog <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Thu, Mar 29, 2012 at 1:34 PM, Eugen Leitl <eugen@leitl.org> wrote:
>
> Claim: 1.4 GBit/s over up to 13 km, 24 GHZ, @3 kUSD/link price point.
>
> http://www.ubnt.com/airfiber
Claims are actually "Up to 1.4 Gbps" and "Up to 13 km"; those two
conditions probably cannot be satisfied together.
1.4 Gbps is actually 700 Mbps per direction. Modulations are 64 QAM,
16 QAM and QPSK (all MIMO) and QPSK (SISO), so we can guess the
throughput of each data rate as:
64QAM MIMO - 720 Mbps (changed from 700 Mbps for numerical convenience)
16QAM MIMO - 480 Mbps
QPSK MIMO - 240 Mbps
QPSK SISO - 120 Mbps
Rubens
