>And these are as robust and immune from interference as Canopy? C'mon Chuck...you know better =)
-Charles ------------------------------------------- WiNOG Wireless Roadshows Coming to a City Near You http://www.winog.com ----- Original Message ----- From: "Charles Wu" <[EMAIL PROTECTED]> To: "WISPA General List" <wireless@wispa.org> Sent: Thursday, July 17, 2008 9:55 PM Subject: Re: [WISPA] top 10 benefits of Wimax in 3.65ghz - my 2 cents > >So, what down converted 802.11a systems are there for 900? > > Mini-PCI: > Ubiquiti > Zcomax > > Vendor Solutions: > Tranzeo > Alvarion > Vecima/WaveRider > Wu-Wu Special* > > *We are doing some exploratory investigation =) > > -Charles > > ----- Original Message ----- > From: "Charles Wu" <[EMAIL PROTECTED]> > To: "WISPA General List" <wireless@wispa.org> > Sent: Thursday, July 17, 2008 9:19 PM > Subject: Re: [WISPA] top 10 benefits of Wimax in 3.65ghz - my 2 cents > > >> Even thought this thread is a bit old, couldn't help but add my 2 cents >> (as there seems to be a resurgence of "puff" in this space) >> >> >> >> DISCLAIMER: I am also a vendor of various WiMAX 802.16d systems - so feel >> free to apply your necessary 'BS' filter >> >> >> >> >> >> Benefits of Wimax in 3.65ghz >> >> >> >> 1. Spectral efficiency ( 4.85 gross bp/hz ) On a six sector >> >> configuration with only 25mhz of spectrum, you can effectively deliver >> >> approx 20mb per sector or 120 mb / per pop, 240 mb when all 50 mhz is >> >> supported. Support for thousands of subscribers is possible off the same >> >> BSU. >> >> >> >> This isn't all too exciting, IMO - there are plenty of systems out there >> that have similar (if not better) spectral efficiency characteristics as >> to what the WiMAX 802.16d standard offers...also, with the uncertainties >> of 3650 licensing, which is, from an interference protection perspective, >> not that much different that Part-15, higher order modulation schemes >> don't do much in the presence of noise >> >> >> >> Case in point: Why does everyone keep using Canopy 900 MHz systems when >> you can get an 802.11a OFDM-based down-converted system that delivers >> 3-4x >> the throughput? Well, it's a matter of what's actually going to work in >> the crowded 900 MHz band. >> >> >> >> >> >> 2. multiple vendor support ( currently you have Redline, Aperto, >> >> Airspan, Alvarion, all with FCC approved equipment ) >> >> >> >> The "concept" of interoperability is one of the most "oversold" features >> of WiMAX which needs to be explained... >> >> >> >> Fictitious Scenario: >> >> >> >> Say I had deployed Brand A system for my business users, and in order to >> enable VoIP services, I enable a variety of the more advanced MAC >> features >> (rTP for my VoIP)...I set up a variety of service flows that are >> customized to each user...blah blah blah >> >> >> >> Problem is, Brand A system, for whatever reason, didn't support UGS and a >> few esoteric service flow / packet filtering features, but at the time, >> I'm really not too concerned because (a) my customers don't demand UGS >> from me right now and (b) the concept of "WiMAX interoperability" story >> gives me the conclusion that if I really need UGS, I could just buy / >> upgrade to Brand X system and retain all of my Brand A CPEs that I've >> deployed. >> >> >> >> Now, 6 months later, I've deployed 50 CPE in the field, and business is >> doing good...so good in fact that 2 customers want to upgrade to a >> "premium" service that requires features not currently supported on Brand >> A AP. Luckily, I have a "WiMAX" system so I go upgrade Brand A AP with >> Brand X. Common sense would lead me to believe that Brand X would >> support >> all of my CPE's features, plus supporting the enhanced feature of UGS >> that >> I need >> >> >> >> Sorry, isn't going to work >> >> >> >> As things turn out, the only "interoperability" testing done between >> Brand >> A CPEs and Brand X APs were done at the Best Effort feature set (basic >> Ethernet connectivity)...additionally, Rf interoperability was done at a >> 3.5 MHz channel size, and I've been running Brand A at 10 MHz to maximize >> my throughput (oh, and Brand X only supports 3.5 MHz, 5 MHz & 7 MHz >> channel sizes)...so to get this interoperability, I lose all of my rTP / >> VoIP prioritization for my entire network, or I have to go out and >> replace >> my 20 Brand A CPEs that are running VoIP with Brand X CPEs >> >> >> >> Oops >> >> >> >> What's the moral of the story? >> >> >> >> Ultimately, unless you're willing to run your network at the lowest >> common >> denominator, you're basically buying into a proprietary system. >> >> >> >> 3. Better RF performance ( even with siso systems ) >> >> >> >> Better RF performance as compared to what? And in what vein? >> >> >> >> I can easily "slant" the argument the other way by bringing up an example >> where a proprietary system outperforms WiMAX >> >> >> >> Noise Immunity: Are you saying that WiMAX has better noise immunity that >> Canopy (OFDM vs. FSK...yeah right) >> >> NLOS: Are you saying that WiMAX can do better NLoS than 900 MHz? >> >> Urban Reflective NLOS: Are you saying that WiMAX can do better Urban NLoS >> than a MIMO-based 1024-FFT OFDM system? >> >> >> >> 4. NLOS performance ( OFDM+OFDMA = More difficult shots obtain link ) >> >> >> >> See above >> >> >> >> 5. Better QOS support, and service flows ( UGS, NRTPS, ETC can be ) >> >> >> >> There can be an argument made that the WiMAX MAC is much more >> sophisticated than the Canopy / Alvarion VL / Trango / Tranzeo / CSMA-CA >> systems on the market today...that said, don't forget that there is a >> $$$COST$$$ for this sophistication...namely, you effectively lock >> yourself >> into a "proprietary" implementation of your WiMAX system >> >> >> >> 6. Greater scalablity ( Single sector can support hundreds of >> >> subscribers, our platform supports 30,000 pps ) >> >> >> >> WiMAX in it's true tested and interoperable state maxes out at an >> aggregate "throughput" range of ~10 Mbps per AP >> >> >> >> To get better performance (up to 20 Mbps / AP), I give up >> interoperability >> >> >> >> >> >> 7. Support for multiline VOIP out of box ( UGS + 30K PPS ) >> >> >> >> At the expense of interoperability >> >> >> >> 8. Sub 350 cpe shipping today ( in 100 packs, less with frame order >> >> commitments putting your cost sub 300 ) >> >> >> >> Ubiquiti Lightstations are sub-$100 >> >> Tranzeos / Deliberant / whatever are in the $100-200 range >> >> Motorola Canopy / Alvarion is in the $200-300 range >> >> >> >> Oh, and they (just like WiMAX) are basically proprietary >> >> >> >> 9. Carrier class systems vs Wisp class ( True 99.999% uptime solutions >> >> available for base station equipment, reducing downtime and truck rolls >> >> ) >> >> >> >> Carrier Class = $10k APs >> >> If you're willing to spend $10k for an AP - you can get a proprietary >> 'WISP' system that has all the "carrier-class" features of "WiMAX" >> >> >> >> 10. Carrier class network management systems that simplify provisioning >> >> and management of subscribers and base stations. >> >> >> >> Lol...I find this amusing...as the WiMAX specification "overcomplicates" >> the provisioning process, so you now have the need to purchase a system >> to >> simplify provisioning so it will work like a Canopy / Trango / Tranzeo / >> Alvarion =) >> >> >> >> Supply and Demand at its best =/ >> >> >> >> That said, if you are still interested in WiMAX after this "cold dose of >> reality," we have plenty of radios in stock =) >> >> >> >> -Charles >> >> >> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! 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