On Apr 21, 2009, at 6:39 PM, Michael Baird wrote: > Have you deployed it? From my initial research, it appears that the > bigger vendors Motorola/Alverion are supporting the 802.16e variety, > while the smaller vendors such as Tranzeo are supporting the 802.16d > variety. I'm aware of the advantages at the Mac Layer, but why would > 802.16d at 3.65 with a slightly higher EIRP at 7 mhz channel spacing > have better range then 802.11 variants at 2.4?
Noise. You should get, iirc, a 20 db lower noise floor at 3.65. Also, (again, iirc), in .16d you get to use 1 watt per MHz of channel size. So with a 7 MHz channel you have 7 watts to work with. The noise floor alone is worth 100x the power, and the extra EIRP is just a bonus. Chuck > > > The 802.16d unit specs I've looked at don't appear to scale much > higher > then the 2.4 units, but 802.16e appears to have the 2x2, 4x4 antenna > tech that it seems would make a big difference at range. What's the > magic that makes 802.16d work better then 802.11 variants as far as > coverage, with essentially the same power but at a higher frequency? > > Regards > Michael Baird >> Here is the quick answer: >> 802.16d is a fixed only technology (no mobility) which performs quite >> well for delivering broadband to homes and businesses. Highly >> available. Secure. More expensive, more scalable and somewhat higher >> latency than similar fixed technologies based on 802.11 and other >> proprietary systems similar to 802.11. Most prominently used in 3.65 >> GHz in the US. Heavily used in 3.5 GHz in international areas where >> no copper plant has been installed previously. Unique feature of this >> technology is the ability to provision service flows with predictable >> performance criteria. This enables SLA provisioning on wireless >> broadband virtual circuits and many other advantages over any other >> broadband platform (wireless or wired). >> >> 802.16e is a fixed and mobile platform. This is being used now in 2.5 >> GHz licensed band in the US and elsewhere. Very little has been done >> to take full advantage of mobility in this band. More expensive to >> deploy than 802.16d. Higher latency than 802.16d. This is a direct >> competitor to LTE systems for cellular. If you do not hold an >> exclusive licensee in 2.5 GHz then this is not likely an option for >> you at this time. >> >> For more input and more help take it to the [email protected] list >> for >> paid members and we can dig into it deeper including step by step >> instructions for getting your own 3.65 license and applying for >> locations. >> Scriv >> >> >> On Tue, Apr 21, 2009 at 8:26 AM, Michael Baird <[email protected]> >> wrote: >> >>> I'm researching these two technologies and Wimax in general, does >>> anyone >>> have any firsthand experience with the two current different types >>> of >>> Wimax, or references to the differences in the two different types >>> of >>> technologies for broadband fixed rural deployments? >>> >>> Regards >>> Michael Baird >>> >>> >>> -------------------------------------------------------------------------------- >>> WISPA Wants You! Join today! >>> http://signup.wispa.org/ >>> -------------------------------------------------------------------------------- >>> >>> WISPA Wireless List: [email protected] >>> >>> 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: [email protected] >> >> 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: [email protected] > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ -------------- Chuck Bartosch Clarity Connect, Inc. 200 Pleasant Grove Road Ithaca, NY 14850 (607) 257-8268 If all is not lost, where is it? -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
