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You will need routing. Marlon K. Schafer wrote: Right. I get that part. But I've never used it out here so I don't know if it's a routing function or a bridging function like spanning tree. I'm trying to figure out what hardware would be best deployed at the tower sites.Part of what I'm trying to do is get a grip on long term costs. If I have to run sensitive routers vs. hardened switches it'll make a difference. Adding heat and AC to the towers changes the annual costs quite a bit. thanks, marlon ----- Original Message ----- From: "Mike Hammett" <wispawirel...@ics-il.net> To: "WISPA General List" <wireless@wispa.org> Sent: Wednesday, March 04, 2009 7:53 AM Subject: Re: [WISPA] 100 meg full duplex backhaulOSPF is how you manage load sharing and load balancing. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------- From: "Marlon K. Schafer" <o...@odessaoffice.com> Sent: Wednesday, March 04, 2009 9:36 AM To: "WISPA General List" <wireless@wispa.org> Subject: Re: [WISPA] 100 meg full duplex backhaulCertainly Jack. I don't know anyone that's built something like this already though. And, it's really not that far off from what we already do. It's just bigger and faster. I've not used the hardware needed for this system so I'm mostly interested in what people would install. I know there are a few people here that have very high speed backbone systems in place. The one part that's got me stumped so far is what to do to create a load sharing load balancing mechanism at the main towers. Should that be done via high end switch or router? If you know someone that would be good help in putting this idea together please feel free to have them contact me. Please note, that nothing will be able to happen at a nut and bolt specific level until construction starts. The program is customer and land acquisition specific, not build it THIS way specific. Did I say that at all clearly? Does it make sense? That is part of why I've not even looked for help yet, there are far more questions than plans in place. Things are still at a conceptual stage, but I'm trying to drill down a bit better. Thanks! marlon ----- Original Message ----- From: Jack Unger To: WISPA General List Sent: Tuesday, March 03, 2009 10:06 PM Subject: Re: [WISPA] 100 meg full duplex backhaul Marlon, Trying to design a complex system like this via a listserve "committee" is more than a little bit risky. Have you considered going to someone who actually has this type of network design experience and paying them to do the whole job right the first time? Just asking. jack Marlon K. Schafer wrote: I don't know if I'll be able to put some many antennas on the towers. How close together would I need the towers to prevent the rain fade outage at 18 gig? Aren't there any 5.8 systems that will do this reliably in the first place? I shouldn't need 5.x for distribution so I could use it all for backhaul. I'll have 2.4, 3.65, 4.9 and hopefully, someday, TVBD for the consumers. marlon ----- Original Message ----- From: "Brian Webster" <bwebs...@wirelessmapping.com> To: "WISPA General List" <wireless@wispa.org> Sent: Tuesday, March 03, 2009 9:44 PM Subject: Re: [WISPA] 100 meg full duplex backhaul The 5.8 GHz backup links will help you deal with outages due to environmental conditions such as rain fade. That has to be factored in for links when you operate above 10 GHz. Even if you run a loop configuration you could have a fade condition that could block out a whole tower site severing your links to that location in both directions of your loop. Another path at a lower frequency with spatial diversity from your primary link (different mounting heights) would at least keep that site up though maybe not at full speed. Thank You, Brian Webster -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org]On Behalf Of Marlon K. Schafer Sent: Wednesday, March 04, 2009 12:26 AM To: WISPA General List Subject: Re: [WISPA] 100 meg full duplex backhaul Thanks. Do you think we need the unlicensed for each hop if the entire network is build in a circle? marlon ----- Original Message ----- From: "Travis Johnson" <t...@ida.net> To: "WISPA General List" <wireless@wispa.org> Sent: Tuesday, March 03, 2009 9:12 PM Subject: Re: [WISPA] 100 meg full duplex backhaul Licensed 18ghz links with 5.8ghz backup links for each hop. Figure $15,000 per link for everything. Travis Microserv Marlon K. Schafer wrote: Hi All, I'm looking for some gear that'll be rock solid at 15 to 20 miles. Some links may be less, but I'm not counting on that. I'll be hauling public safety, private vpns, and normal internet traffic. I'll probably have around 20 towers, all linked in a ring. I can load share across the ring as long as speeds never drop below 100megs. I'll want things to be automatically self healing if there is a loss of connectivity in any direction. What would you guys use/suggest? I'd love to go licensed (but no 6 gig due to antenna sizes) but unlicensed may be OK due to the failover capabilities. We have to worry about snow, fog and, worst of all, dust storms. What gear would you use? How would you set this up? I'm in the pricing stage so off list quotes etc. are welcome. Pall park numbers are fine at this time, as long as they tend to run high vs. low, I'd rather over estimate the costs. thanks, marlon ------------------------------------------------------------------------- ------- WISPA Wants You! 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