Unfortunately for reason I don't understand (because what you say to me as well seems to make more sense) they measure by spectral density power strength. So you can only do so much power per MHz. This of course means just what you say the wider channel your allowed to use the higher power levels you can accommodate. Since you have more spectral space to do the power in.
/Eje Sent via BlackBerry from T-Mobile -----Original Message----- From: "Tom DeReggi" <[email protected]> Date: Tue, 21 Apr 2009 19:29:57 To: WISPA General List<[email protected]> Subject: Re: [WISPA] Wimax 802.16d v 802.16e Chuck, That is defiantely a plus now. But isn't that like a false advantage in the long run? With only 20-30Mhz of spectrum, will it stay noise free for long? >in .16d you get to use 1 watt per MHz of channel size. How much watts per Mhz for 16e? On a side note, anyone know why FCC decided to reward people using larger channels with more power? Wouldn't it have been more politically correct to reward those that used smaller more efficient channels with higher power, to give them a reason to be more efficient? I'm sure there is a technical reason, that I don't understand, yet. Tom DeReggi RapidDSL & Wireless, Inc IntAirNet- Fixed Wireless Broadband ----- Original Message ----- From: "Chuck Bartosch" <[email protected]> To: "WISPA General List" <[email protected]> Sent: Tuesday, April 21, 2009 6:59 PM Subject: Re: [WISPA] Wimax 802.16d v 802.16e > > 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/ -------------------------------------------------------------------------------- WISPA Wants You! 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