[183706] in North American Network Operators' Group
Re: WiFI on utility poles
daemon@ATHENA.MIT.EDU (Mike Hammett)
Thu Sep 10 21:52:55 2015
X-Original-To: nanog@nanog.org
Date: Thu, 10 Sep 2015 20:52:18 -0500 (CDT)
From: Mike Hammett <nanog@ics-il.net>
Cc: nanog@nanog.org
In-Reply-To: <0141EE78-AB3E-4C0B-B9A0-1D6BBFE5A324@puck.nether.net>
Errors-To: nanog-bounces@nanog.org
AirView will see everything.=20
-----=20
Mike Hammett=20
Intelligent Computing Solutions=20
http://www.ics-il.com=20
Midwest Internet Exchange=20
http://www.midwest-ix.com=20
----- Original Message -----
From: "Jared Mauch" <jared@puck.nether.net>=20
To: "Michael Englehorn" <michael@englehorn.com>=20
Cc: nanog@nanog.org=20
Sent: Thursday, September 10, 2015 8:16:07 PM=20
Subject: Re: WiFI on utility poles=20
> On Sep 10, 2015, at 1:47 PM, Michael Englehorn <michael@englehorn.com> wr=
ote:=20
>=20
> My issue with the "free" wifi that comcast is forcing into our homes and=
=20
> businesses is that it's also interfering with our own access points in=20
> the same building!=20
>=20
[resending due to hitting limit on file size to nanog list]=20
This is the biggest problem I=E2=80=99ve seen regarding this. If you care a=
bout 5ghz please provide=20
feedback about the LTE-U stuff and encourage the cablewifi, wayport, etc to=
do a proper listen-before-use=20
similar to what is required with DFS to avoid interference.=20
Here=E2=80=99s a sample of what a spectrum might look like:=20
http://puck.nether.net/~jared/airview_20150910_210354.png=20
and=20
http://puck.nether.net/~jared/airview_20150910_211313.png=20
You can clearly see things at the various frequencies but without looking a=
t the waveform you may not see the 40mhz user and where their center freque=
ncy is. If they are just sending beacons it may look different. A =E2=80=9C=
site survey=E2=80=9D isn=E2=80=99t a spectrum view as your receiver may not=
understand what is going on.=20
This is the UBNT 5ghz AC radio which is quite handy, but it as it=E2=80=99s=
an 802.11 device it may not see other things that use the ISM band and are=
n=E2=80=99t 802.11 based. These do exist, eg: mimosa b5, af-5/af-5x. These =
may use different frequencies for TX vs RX as well.=20
Either way, I figure this is interesting enough to share if you aren=E2=80=
=99t doing WISP stuff or looking at spectrum often.=20
- Jared=20
