[ANSS-netops] ethernet bridges

[David S. Croker]

Richard,

That's a new company to me.  Very intriguing products.  I could see 
applications for dense arrays or portable reflection arrays.  They 
would probably work fine for our application, except for the power 
consumption.  Our installation is going to require us to use solar 
and batteries at the site end, and at 1A draw, that's a lot.  The 
receive end is in a building so that's no problem except for reduced 
run time during a power outage (think large earthquake, radio on a 
small UPS).  That's still the greatest advantage of Freewave radios.

Thanks for the info.

Dave

At 10:11 AM 10/31/2008, Richard Godbee wrote:
>On Oct 31, 2008, at 12:14 PM, David S. Croker wrote:
>
> > Timely question for us too.  We have an application for just such a
> > short hop "WiFi" link (across a parking lot).  We were thinking about
> > using off-the-shelf wireless routers, but maybe we'll have to rethink
> > things after your experience.
>
>I just discovered this morning that Ubiquiti Networks has several new
>lines of inexpensive, weatherproof 2.4 GHz and 5.8 GHz 802.11 bridges
>that are designed for Wireless ISP deployments.  (Some of them are
>under $100 for a pair with integrated antennas.)  I've never tried any
>of them, but the price is right and the specs look good.
>
>http://www.ubnt.com/products/
>
>The Picostation, Nanostation Loco, and Bullet look especially
>interesting.
>
>
>On Oct 31, 2008, at 12:36 PM, Kyle Persefield wrote:
>
> > I think there was a just one little quirk about the Maxstreams, you
> > have to use matching TX RX pairs.
>
>Yes, the XPress Ethernet Bridges are matched pairs.  If one fails, you
>will have to send both radios in for repair/replacement.
>
>For what it's worth, AvaLAN is now selling point-to-multipoint
>versions of their Ethernet bridges, but they have a *very* significant
>limitation -- each radio can only learn one MAC address on its
>Ethernet port.  If you need to connect more than one device, you have
>to put a router between your devices and the radio.
>
>--
>Richard Godbee, Unix Systems Administrator
>Department of Geosciences, Virginia Tech
>4044 Derring Hall (0420), Blacksburg, VA 24061
>rwg at vt.edu / +1.540.231.7002 / +1.540.231.3386 (FAX)
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