There are different constraints. In 5 GHz PTP mode we can easily deal with 20 mile+ links due to EiRP limits, but in PMP typically we see most clients within 1 - 2 km of the sector.
In 3.65 GHz PMP applications we have EiRP limitations and more importantly typical deployment limitations due to OLOS and NLOS between the base station and typically, outdoor CPE. Fundamentally in PMP applications, you are trading off coverage for capacity since you want the highest possible sector capacity (typically 15 - 18 Mbps net per sector) in order to maximize your revenue opportunity. Since WiMAX uses a TDMA MAC, a QPSK modulated end customer takes 27x the sector resource of a 64QAM customer. Typically, the goal is to maximize your sector throughput and customer count per sector to maximize your ROI. That being said, if you want a PTP application a product like the MAX+ AN-80i will deliver similar reach to 5 GHz with sub 1 ms latency. Kevin -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Mike Hammett Sent: Thursday, April 23, 2009 2:04 PM To: WISPA General List Subject: Re: [WISPA] 3650Mhz and Wimax Vendors I can do almost 20 km with 5 GHz, why can't I with 3650? ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------- From: "John Scrivner" <j...@scrivner.com> Sent: Thursday, April 23, 2009 11:32 AM To: "WISPA General List" <wireless@wispa.org> Subject: Re: [WISPA] 3650Mhz and Wimax Vendors > On Thu, Apr 23, 2009 at 10:51 AM, Patrick Leary <ple...@apertonet.com> > wrote: >> Thanks for the compliment Daniel, but please God, let's not have anyone >> thinking they can build a 30 km radius cell with our stuff or anyone's >> stuff in WiMAX. I don't care if you can see your dog running away for >> three days it is so flat and the sun always shines and the wind is >> always at your back -- I know of no PMP situation where such a cell >> should ever be built. >> >> >> Patrick Leary >> Aperto Networks >> 813.426.4230 mobile > > Thanks Patrick. It took me a long time to get past the original snake > oil mentality of WiMax proponents when they were claiming 70 megabits > out 70 miles. I went through a phase of being dead set against WiMax > because I thought the culture lacked integrity over all the false > hype. Then I began reading the real story of what made 802.16 > technology tick. The more I read the more I decided that it really is > a sound technology. I eventually bought a system from Redline and have > been quite happy with the results. It is nice to be able to go into my > higher end business customers and tell them I can deliver more for > their money through the air than cable and DSL can bring to the table. > That is TRUE. The service flows capability alone make WiMax worth the > extra bucks. > > Now fast forward to this thread. I have seen my WiMax vendor of choice > bashed by another vendor rep. I have seen the same person claiming 20 > to 30km sized cells in 3650 which is not a reasonable expectation. It > makes me sick to my stomach. We should expect that people will act > with respect and integrity on industry list servers. Let's straighten > up folks. > 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/
