A members-only list, so if people don't mind to keep it going on this list instead of the closed one...
Rubens On Sat, Sep 12, 2009 at 8:53 PM, Josh Luthman <[email protected]> wrote: > Heads up thread - Jack made a new list for 3.650 topics specifically. > > On 9/12/09, Chuck Bartosch <[email protected]> wrote: >> Tom, >> >> 802.16d implementations can and do support diversity antennas on the >> AUs. >> >> I don't know the definitive answer to the rest of the question. But I >> do know that: >> >> (1) Clients in 802.16e can and do support diversity >> >> (2) The clients are supposed to be interoperable >> >> (3) I know of no clients that support diversity in 802.16d >> >> So, speculatively, the point might that 802.16e clients support >> diversity and interoperate. >> >> You pick up at least a few db with client diversity antennas-though >> not nearly enough to make up for the lower power regime you have to >> operate in. >> >> Chuck >> >> >> >> On Sep 11, 2009, at 7:12 PM, Tom DeReggi wrote: >> >>> Patrick, >>> >>> Always great to see your list posts filled with good info. Responses >>> inline... >>> >>>> The E standard does enable use of diversity, but it comes at a high >>>> cost >>>> and is of limited benefit for rural operators. The truth is that >>>> diversity is designed to increase link budgets to support self- >>>> install. >>> >>> Can you clarify? Are you saying D Spec does not support Diversity? >>> Or that most D vendors focusing on price chose not to include >>> implementation >>> of it? >>> >>> Even most Wifi chipsets supports diversity. >>> >>> My understanding was D supported diversity, because the early Pre- >>> Wimax >>> Aperto supported all types of Diversity. >>> Please clarify. >>> >>> I'd like to add... I'd like to see more FIXED products support >>> Diversity at >>> the AP. >>> Trials have shown that Polarity diversity yielded much better >>> results than >>> Spacial diversity for NLOS. BUT, that data does not consider spectrum >>> availabilty and congestion. >>> Many Metro deployments can't afford to waste a polarity, with limited >>> spectrum and lots of noise, and forced to abandon the idea of Polarity >>> diversity. >>> Spacial Diversity at teh AP is an enhancement that can be used >>> without any >>> trade-off other than Colo fees if can't avoid paying colo per antenna. >>> Actually in newer MIMO designs Spacial Diversity on its own showed >>> signficant improvements in range. >>> This could becaome even more important in 3.65 with few channels. >>> >>>> Basically, each standard has its place, E is for people in 2.5 GHz >>>> doing >>>> self-install, like Clearwire, and we all know the low service >>>> (especially low upstream) packages offered in Clearwire's service. >>>> D is >>>> better and cheaper for rural fixed operators, and especially for >>>> public >>>> safety video type networks and definitely for voice-centric users. >>>> D is >>>> better for enterprise, where many users sit behind the CPE. E is >>>> better >>>> for roaming individual users with modest expectations. >>> >>> I'd agree. And I'd agree "D" is most appropriate for most WISPs. >>> >>> I think the biggest factor in deciding though isn't technology specs? >>> People want to pick the technology with the longest life span. >>> Many WISPs might prefer D, but are afraid D might be discontinued >>> sooner, >>> since the big dollar might have followed E. >>> Just like is happening right now. >>> I think the number one factor that will lead WISPs to pick D is >>> acknowledgement that Vendors understand and see the long term >>> potential and >>> MArket for D, so we can be confident about our vendors. >>> So far, I think the primary vendors have done a good job showing their >>> supprot for D. >>> >>> The other number 1 barrier to WiMax is price, so once again many >>> have chosen >>> D for price reasons. >>> But that is a fake benefit, because technically there is no reason >>> that E >>> product couldn't be sold just as Cheap if it came down to it. >>> If anything, E has the potential to drop to lower prices, because of >>> economy >>> of scale and diverse use for WiMax chipsets. >>> >>> So what I'm saying is... Wimax E is killing themselves by pricing >>> their >>> products to high. Right now D has the potential to regain its market >>> share >>> because its price advantage. >>> However, one good way for E to protect its market share is to try and >>> influence the discontinuation of D. >>> Thus important to support the continued development of D. >>> >>> Tom DeReggi >>> RapidDSL & Wireless, Inc >>> >>>> We'd like to hear your opinions, and if you like to discuss this >>>> with us >>>> while at 4G World, please drop me a note. >>>> >>>> Regards, >>>> >>>> Patrick Leary >>>> Aperto Networks >>>> >>>> >>>> Patrick Leary >>>> Aperto Networks >>>> 813.426.4230 mobile >>>> >>>> >>>> -------------------------------------------------------------------------------- >>>> 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 >> >> "When the stars threw down their spears, >> and water'd heaven with their tears, >> Did He smile, His work to see? >> Did He who made the Lamb make thee?" >> >> From William Blake's Tiger!, Tiger! >> >> >> >> >> >> -------------------------------------------------------------------------------- >> 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/ >> > > > -- > Josh Luthman > Office: 937-552-2340 > Direct: 937-552-2343 > 1100 Wayne St > Suite 1337 > Troy, OH 45373 > > "When you have eliminated the impossible, that which remains, however > improbable, must be the truth." > --- Sir Arthur Conan Doyle > > > -------------------------------------------------------------------------------- > WISPA Wants You! 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