[ANSS-netops] ethernet bridges

[Robert Busby]

Hello netops
Transportable Array uses about a hundred maxstream ethernet bridge 
radios when we link a vault to a AC VSAT or Solar VSAT communications 
module, hops  less than 1 km.
We have also used Freewave and now use those mostly in longer hops.  The 
maxstream radio is cheaper and has proved very reliable in our 
experience and we recommend them for the proposed application.
We use the Xpress radios (900 Mhz) in the outdoor package with no change 
of the factory default settings, they deliver in excess of 500kbps.  
They are paired radios, which can be a pain if one is on a mountaintop.

As references: 
Glen Offield at IGPP UCSD uses Afar radios,
Dave Mencin at PBO uses intuicom radios, which may have derived from 
Freewave engineering talent.



Kyle Persefield wrote:
> All,
>
> Just my 2 cents worth.  The Maxstreams are used extensively by 
> PASSCAL.  I believe they were about half the price of Freewaves.  I 
> think there was a just one little quirk about the Maxstreams, you have 
> to use matching TX RX pairs.  Maybe Bob Busby can chime in on this.
>
> At 10:14 AM 10/31/2008, you wrote:
>> Hi Dave,
>>
>> 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.
>>
>>  From the NetOpsII meeting, I remember Richard Godbee from Virginia
>> Tech saying he was using the Maxstream radios with good
>> results.  Don't know the model numbers or any specs.  I seem to
>> recall he was using it for cross-campus connections, but I can't be
>> sure.  It looks like Maxstream was bought by Digi.  Those products
>> look to have pretty good price to performance value and might be just
>> right for your application, but I have no experience with them.
>>
>> A couple other companies to check out are Afar and Eion (who recently
>> bought WiLan).  I forget who I talked to who uses Afar products, but
>> I know Berkeley uses WiLan products (although it seems like they are
>> moving towards Freewave down in Parkfield).  Afar touts Mesh
>> networking if that helps.
>>
>> If you get something working that you like, let us know.  Like I
>> said, we have an application for it too.
>>
>> Dave Croker
>>
>>
>> At 03:16 PM 10/29/2008, Dave Drobeck wrote:
>> >Hi All,
>> >We recently deployed some dataloggers using consumer grade WiFi 
>> links.  They
>> >proved to be very poor performers for continuous telemetry.  We're 
>> looking
>> >for other ideas.  We could certainly use Freewave, Trango, Canopy, 
>> etc, but
>> >these are all way over-kill for the applications (a few hundred 
>> feet) and
>> >costly.   What other ethernet bridges have folks used (Maxstream?) 
>> that have
>> >proven reliable?
>> >Dave Drobeck
>> >University of utah
>> >_______________________________________________
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>>
>>
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>
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>
> Regards,
>
> Kyle E. Persefield
> Honeywell Int'l HTSI, Field Engineer
> USGS Albuquerque Seismological Laboratory Contractor
>
> Observatory "Trouble" Hotline Telephone: 505-846-5646
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>
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>

-- 
============================================================
Robert W. Busby
Transportable Array Manager			508-801-7628
USArray / EarthScope				37 Haynes Avenue
www.earthscope.org/usarray			Falmouth MA USA 02540-2312

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