Allen, great to see you pop up on the list again. You've been missed. Patrick Leary AVP, Market Development Alvarion, Inc. o: 650.314.2628 c: 760.580.0080 [EMAIL PROTECTED]
Visit Alvarion at WiMAX World Chicago, September 25-27 Booth #409 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Allen Marsalis Sent: Monday, September 10, 2007 3:28 PM To: WISPA General List Subject: Re: [WISPA] Thoughts on 900MHz mesh networks Thank you David for your thoughts on this. I too am a bit skeptical. :) Which is why I decided to ask for comments from you guys. There is the additional issue of "mesh" routing protocols but I think (and I mean think) I may have that covered if the physical stuff worked out ok. It's just the whole concept might fall flat for a dozen reasons. I'm trying to figure out how many nodes I would need to deploy in a real world test, but I also want to think this out before getting that far and spend a bunch of money. The idea may be so bad that testing is unwarranted. But hey, there must be at least 8 people left in the country without broadband, and I want to give it to them! ;) Allen At 01:05 PM 9/10/2007, David E. Smith wrote: >Allen Marsalis wrote: > >>I take it that nobody has ever built a 900MHz NLOS mesh network before. >>Which is not a good sign to me. That's a sign that my idea >>probably won't work..... > >I'd be very skeptical just because of what I lovingly call the >"Tropos Effect." > >Obviously, all these nodes eventually have to come back to... >somewhere that has a big bad Internet connection. Your office, a >central tower, whatever. If you're near that tower, you don't have >much of a problem, as your laptop is talking to a node that's >talking directly to that point of origin. If you're a few blocks >away, where your laptop talks to a node that's two or three hops >away, there's cumulative bandwidth loss and added latency, and just >more things that can go wrong generally. > >Your proposal gets rid of the worst part of how Tropos does things. >They use the same radio both for inter-node communication and for >customers, same SSID, same everything; by using separate radios for >backhaul and customer access, you're already coming out ahead. > >There will still be added overhead and latency, the more nodes you >have to go through, and the folks at the farthest reaches of the >network won't have as good an experience as the folks close to your >point of origin. > >I'm a bit skeptical. The expense of 900MHz gear, and the sheer >number of units you'd need to for a wide coverage area, makes this >seem like a really difficult idea to pull off. Nevertheless, I wish >you luck, if you do choose to deploy something like that. > >David Smith >MVN.net ------------------------------------------------------------------------ -------- ** Join us at the WISPA Reception at 6:30 PM on October the 16th 2007 at ISPCON ** ** ISPCON Fall 2007 - October 16-18 - San Jose, CA www.ispcon.com ** ** THE INTERNET INDUSTRY EVENT ** ** FREE Exhibits and Events Pass available until August 31 ** ** Use Customer Code WSEMF7 when you register online at http://www.ispcon.com/register.php ** ------------------------------------------------------------------------ -------- WISPA Wants You! 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