You are not going to get the answers you are seeking. Worse still anyone who tries to give you those answers is either uninformed or lying. As I stated several posts ago, you need to have a thorough understanding of the equipment, have conducting extensive field trials, and produced a business plan specifically for the equipment you selected. You CANNOT get these answers from a mailing list or from datasheets and technical specifications. There are too many tradeoffs that are not altogether clear until have a specific set of equipment, geography, and experience.
For example, just consider the variables involved in determining effective throughput for a subscriber. Your SNR determines what modulation you can run. However, your SNR is affected by your channel width, use of uplink subchannelization, and/or diversity. Of course, lowering the channel width and using uplink subchannelization lowers the theoretical throughput, while raising the SNR. Then there is your framerate and which service flow polling priority you have assigned it, which determines the latency for the flow. Latency has a huge impact on theoretical throughput. Strangely because of the TDD nature of WiMAX radios higher latency enables greater throughput up and until it lowers the theoretical maximum throughput of the flow. The above doesn't even consider the differences between 802.16d and 802.16e. Nor does it consider the impact of multiple subscribers and/ or multiple services flows per subscriber. So what is the right answer to whether to use WiMAX or even which WiMAX flavor or vendor? It depends. -Matt On Apr 23, 2009, at 8:42 AM, Michael Baird wrote: > Do you have any coverage plots? When I started the other thread, I was > really looking for the technical merit's, more then the cost > benefits or > political arguments. I'm interested 802.16d vs 802.16e, some say 16e > is > the greatest, some say 16d is the best, what are the technical reasons > behind which is which. My task at hand is to write up a comparison > for > the benefit of my boss, so that we can make an informed decision on > which technology to choose. > > I've read the specs, but I was hoping to get beyond that, and be > able to > include issues with real world deployments, pros/cons of either > tech. We > don't want to make the investments (we will run fiber to each tower) > and > replace our existing deployments with it. We do want to do voice as > well > (we have a switch and are a CLEC). > > Regards > Michael Baird >> John, >> >> My boss has field tested Aperto's gear to 15miles at full >> modulation... so a >> 30km cell radius (18 miles) is possible. >> >> But the thing is that wouldn't be the average deployment... and >> with Cyclone >> gear you could push the system out that far too (because its going >> to be >> line of sight, and the cell is going to be on a mountain top >> probably) >> >> If the only thing you know about deploying gear is trees like the >> east >> coast... that expectation isn't going to work for you. If you live >> in the >> west where you have towers on mountaintops that can be seen from 70 >> miles >> away... its okay. >> >> My biggest problem with Jeff's analysis is how many customers >> signed up in a >> year... I don't think any WISP will grow 500 customers in 5 >> months. Or even >> 150 customers in 5 months (well I've setup a tower before and >> signed up that >> many customers to one... but that is the exception rather than the >> norm). >> The other catch would be... none of this math makes sense in a rip >> and >> replace... so unless your new... you have to rip an old system out >> to get >> WiMAX. >> >> I also have a slight issue with the assertion that Canopy does not do >> VoIP... it does it just fine and many Canopy WISP's also sell VoIP >> services >> (prime example... Skybeam/JAB). There also is never a 100% take >> rate on it >> (probably more like 50% tops) so that has to be factored in. >> >> With that said... besides the ugly CPE... we have chosen Aperto as >> our >> vendor of choice in the 3.65GHz band. I like it, and I think if >> you do >> field trials with it, it will win out over many of the other systems. >> >> Daniel White >> 3-dB Networks >> http://www.3dbnetworks.com >> >> >> >>> -----Original Message----- >>> From: wireless-boun...@wispa.org [mailto:wireless- >>> boun...@wispa.org] On >>> Behalf Of John Scrivner >>> Sent: Thursday, April 23, 2009 12:13 AM >>> To: jefftho...@fastmail.fm; WISPA General List >>> Subject: Re: [WISPA] 3650Mhz and Wimax Vendors >>> >>> >>>> Cell radius= 30km >>>> >>>> The point is for a TCO, that's one tower site to cover a >>>> 20km radius, meaning less leases per month of 1k or more, so >>>> isntead >>>> >>> of 4 >>> >>>> tower sites to cover this area ( and pay 4k per month ) >>>> >>>> >>> So...how are you breaking the laws of physics with this system? >>> Unless >>> you are serving the middle of the dessert then you probably need to >>> back your cell radius down to say 3km. I see above you use 2 >>> different >>> cell radius figures. Is it possible you are overstating expectations >>> in a big way here Jeff? I am a proponent of WiMax but I am getting >>> sick and tired of seeing bloated specs to sell systems. It is NOT >>> something I want to see and I feel that these false representations >>> have hurt WiMax adoption for years. >>> Scriv >>> >>> >>> ------------------------------------------------------------------------ >>> -------- >>> WISPA Wants You! Join today! >>> http://signup.wispa.org/ >>> ------------------------------------------------------------------------ >>> -------- >>> >>> WISPA Wireless List: wireless@wispa.org >>> >>> Subscribe/Unsubscribe: >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> Archives: http://lists.wispa.org/pipermail/wireless/ >>> >> >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ >> > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------------------------------------------------------------------------- WISPA Wants You! 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