[183703] in North American Network Operators' Group
Re: WiFI on utility poles
daemon@ATHENA.MIT.EDU (Jared Mauch)
Thu Sep 10 21:17:45 2015
X-Original-To: nanog@nanog.org
From: Jared Mauch <jared@puck.nether.net>
In-Reply-To: <55F1C244.5080204@englehorn.com>
Date: Thu, 10 Sep 2015 21:16:07 -0400
To: Michael Englehorn <michael@englehorn.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
> On Sep 10, 2015, at 1:47 PM, Michael Englehorn <michael@englehorn.com> =
wrote:
>=20
> My issue with the "free" wifi that comcast is forcing into our homes =
and
> businesses is that it's also interfering with our own access points in
> the same building!
>=20
[resending due to hitting limit on file size to nanog list]
This is the biggest problem I=92ve seen regarding this. If you care =
about 5ghz please provide
feedback about the LTE-U stuff and encourage the cablewifi, wayport, etc =
to do a proper listen-before-use
similar to what is required with DFS to avoid interference.
Here=92s a sample of what a spectrum might look like:
http://puck.nether.net/~jared/airview_20150910_210354.png
and
http://puck.nether.net/~jared/airview_20150910_211313.png
You can clearly see things at the various frequencies but without =
looking at the waveform you may not see the 40mhz user and where their =
center frequency is. If they are just sending beacons it may look =
different. A =93site survey=94 isn=92t a spectrum view as your receiver =
may not understand what is going on.
This is the UBNT 5ghz AC radio which is quite handy, but it as it=92s an =
802.11 device it may not see other things that use the ISM band and =
aren=92t 802.11 based. These do exist, eg: mimosa b5, af-5/af-5x. =
These may use different frequencies for TX vs RX as well.
Either way, I figure this is interesting enough to share if you aren=92t =
doing WISP stuff or looking at spectrum often.
- Jared
