[Battlemesh] recommendations for 40Km Link

[Dave Taht]

On Mar 22, 2014 9:25 PM, "Nicolás Echániz" <nicoechaniz at altermundi.net>
wrote:
>
> El 04/07/13 05:00, Joseph Bonicioli escribió:
> > Links of that distance are very common in our network (AWMN). Attika in
> > Greece is not flat resulting to many links that are over 10 20 or even
50Km.
> > Moreover since we got access to TV channel installations we have a lot
of
> > long distance links to other areas of Greece and with other wireless
> > communities . It will be pointless to point some out. They are many and
I
> > own a couple of them.
> >
> > Do not over analyze. Maths never fail you (FSL calculations)  and rocket
> > dishes are fine for 40Km. With 34dbi dishes at both ends you will get
-71db
> > signal with no Tx power at all. If you add 5-10db Tx power you will be
well
> > in the good performance zone of -61 to -66.
> > If you are in a noiseless environment you will be thrilled to find that
the
> > performance will be "just" as good as in your test room.
> > You can also find cheaper alternatives. Get yourself a couple of good
solid
> > reliable 120cm offset dishes, a couple of feeders that we can provide
you if
> > you need to and you are ready.
> >
> > On the other hand don't consider anything less than the biggest gain
> > (biggest dishes) and most reliable hardware you can get. You will have
to
> > compensate for bad weather in the winter making the link harder due to
> > conditions, harsh environment may punish hard you equipment and of
course
> > unreliable hardware/software will make you travel a lot. The difference
> > between some extra cash for something a bit more reliable and traveling
> > expenses is big.
> >
> > And don't worry about details like alignment. Those things nowadays if
you
> > have not broken something in your equipment are a breeze with the tools
that
> > you get.
> > Plan for other details if you are going somewhere far or on a mountain.
> > Cables, extra tools, insulation material, things that make your life
and the
> > experience pleasurable, communication equipment, ropes, toolboxes,
people :)
> >
> > Go play, take some pictures and let us know the results! Good luck!!!!
>
>
> We finally got around to finishing our first long distance (50Km) link
> and it's working great.
> Thanks joseph for the hints and optimism :)
>
> We published a small blog post (in spanish and english):
> http://blog.altermundi.net/article/completamos-el-enlace-de-50km/
>
> with some details on link conditions, quality and photos.

I am impressed. Was the link really 50 Mbit in both directions
simultaneously? Are you using airos or OpenWrt?

Got Bufferbloat? What does a rrul test look like? (See netperf-wrappers)

How well does it work in rain?

> Cheers!
> Nico
>
>
> >
> > -----Original Message-----
> > From: battlemesh-bounces at ml.ninux.org
> > [mailto:battlemesh-bounces at ml.ninux.org] On Behalf Of NicoEchaniz
> > Sent: Monday, June 17, 2013 4:41 AM
> > To: Battle of the Mesh Mailing List
> > Subject: [Battlemesh] recommendations for 40Km Link
> >
> > Hi guys,
> >
> > Here in Quintana (Argentina) we are planning a 40Km link to connect
three
> > community networks in the region to the nearest Internet Exchange in
Cordoba
> > City.
> > Our longest link so far is 16Km and it works very well (40Mbps) using
> > AirGrid M5 27dbi.
> >
> > For this occasion we are planning to use Ubiquiti Rocket M5 + 34dbi
dishes.
> > There is clear LOS between both ends; link calculation seems fine but
I'd
> > like to ask about your experience with this kind of long shot high
> > performance links.
> >
> > Any recommendations based on real-world deployments?
> > Are you using these Rocket routers for long links?
> >
> >
> > Cheers,
> > Nico
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