So what does all the below mean in practice? Well, a typical arrangement, at least for our customers, in the 2.5 GHz band is 3 sectors of 4th order diversity. That means one chassis with 3 blades. Each of the blades has 4 ports. All 4 ports are used. That translates into three AU IDUs and 12 ODUs and 6 antennas dual pole antennas that comprise the 3 sectors.
Now you may be getting a sense of the complexity and why the question of "How much for one AP to one sector?" is not really applicable since one 4-port AU can feed a complete cell with 4 90 degree sectors, but that same AU can scale to feed all its channels and capacity into a single sector. With each added level of diversity, the translation is better link budgets (less cells) with increased capacity. Fourth order diversity over no diversity adds 12 dB up and 6 dB down in terms of improved link budgets. This is not generally used to increase range so much as it is to increase link reliability at range. Our expectation is that our 3.65 GHz deployments will mostly have a standard configuration of 3 sectors with 2nd order diversity, except in a high urban deployment (such as a Tower Stream type model), which is more likely to have 4th order diversity to improve the range and number of self-install CPE that can be deployed. Patrick Leary AVP, Market Development Alvarion, Inc. o: 650.314.2628 c: 760.580.0080 [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Patrick Leary Sent: Tuesday, April 22, 2008 3:05 PM To: WISPA General List Subject: Re: [WISPA] Future - a brief explanation on diversity Mike, et al, As Jeff implied about coverage (and costs), with WiMAX it is all about diversity so let me try to explain it a bit. It is not so simple as one AP or two. In WiMAX you have IDUs and ODUs. In our case, one IDU can serve many different configurations since it have 4 ports on the IDU and supports up to 4th order diversity. So here is what each level of diversity actually looks like in terms of configuration: Single channel, no diversity - This is the basic configuration and the one WISPs have always deployed. Each AU-IDU connects to one ODU serving a single sector with a directional antenna. AU/IDU ODU Sector +++++ +++++ +++++ + + --+ O +--- + + + O ---/ + + \---+ O + + O + + O + + + + O + +++++ + + + O + +++++ + + +++++ Multiple channels per AU, no diversity - Can be like above or two or three or four channels. Example shows four channels - AU/IDU ODU 1 Sector antenna 1 Ch.1-4 +++++ +++++ +++++ + + --+ O +--- + + + O ---/ + + \---+ O + + O +-\ + O + + + + O +-\\ +++++ + + + O +-\\\ +++++ + + \\\--ODU 2----sector antenna 2 +++++ \\ \\--ODU 3----sector antenna 3 \ \--ODU 4----sector antenna 4 Second order diversity - One sector with space diversity. Two AU-ODU channels 1 & 2. Same frequency and transmit power. Same AU-IDU share a common MAC and modem. AU/IDU ODU 1 Antenna 1 Ch.1&2 Sector 1 +++++ +++++ +++++ + + --- O ---- + + + O ---/ + + \---- O + + O --\ + O + + + + O + \ +++++ + + + O + \ +++++ + + \ both sectors cover same area +++++ \ )))))) so both function as part of one sector \ ODU 2 Antenna 2 \Sector 1 \+++++ +++++ - O ---- + + + + \---- O + + O + + + +++++ + + +++++ Fourth order diversity - Single sector. Single AU-IDU with 4 ODUs. Space and polarization diversities using dual polarization slant antennas. Channels 1 and 2 form one pair, channels 3 and 4 form one pair. Same frequency and transmit power are set for all four ODUs. Common MAC and modem. AU/IDU ODU 1 Antenna 1 Ch.1-4 Sector 1 (dual pole) +++++ +++++ +++++ + + --- O ---- + + + O ---/ + + \---------- O + + O --\ + O + /--- O + + O --\\ +++++ / + + + O --\\\ / +++++ both dual pole antennas + + \\\--ODU 2/Sector 2 Antenna 2 ))))) function together in a +++++ \\ (dual pole) single sector \\--ODU 3/Sector 1---\ +++++ \ \ + + \--ODU 4/Sector 2--\ \-- O + \--- O + + + +++++ Patrick Leary AVP, Market Development Alvarion, Inc. o: 650.314.2628 c: 760.580.0080 [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Mike Hammett Sent: Tuesday, April 22, 2008 12:18 PM To: WISPA General List Subject: Re: [WISPA] Future Anyone doing a 20 MHz channel? Would that be enough capacity to allow for typical oversubscription on say a 10 meg client? What does it cost to get the first AP up ($5k, $15k, $50k)? What does it cost to get additional APs up ($2k, $10k, $30k)? ---------- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ----- Original Message ----- From: "Jeff Booher" <[EMAIL PROTECTED]> To: "WISPA General List" <wireless@wispa.org> Sent: Tuesday, April 22, 2008 12:46 PM Subject: Re: [WISPA] Future > Chuck, > > Airspan / Aperto are both shipping 5x Ghz wimax products. > > Throughput is about 26mb peak for the Airspan product on 10mhz > channels, and 22mb on the Aperto product in 7mhz channels. Also, there > are ways to get around the exclusion zones, if you find out who the > licenseholders are. > > > > - > > Jeff > > On Apr 21, 2008, at 1:20 PM, CHUCK PROFITO wrote: > >> Patrick, >> Excellent point on channel sizes! >> So if WiMAX is released in unlicensed frequencies of 900, 2.4? , >> 5.X, 3.6 >> (we are in a big exclusion zone.) >> I imagine if you deployed in 2.4 it would smoke the home routers. >> Would our capacity double for the same channel sizes? >> Would it use the same channel sizes? >> Would it help with range and capacity? >> Will WiMax help tree penetration? Can Physics be bent? >> In legacy deployments, would or could it improve our back hauls? >> >> >> Chuck Profito >> 209-988-7388 >> CV-ACCESS, INC >> [EMAIL PROTECTED] >> Providing High Speed Broadband >> to Rural Central California >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> On >> Behalf Of CHUCK PROFITO >> Sent: Monday, April 21, 2008 10:01 AM >> To: 'WISPA General List' >> Subject: Re: [WISPA] Future >> >> Patrick, >> If not 70 miles and 30 mbps, >> what are the real numbers on the fixed, for say: >> 2 miles los? >> 2 miles wooded? >> 5 m los? >> 5 m nlos? >> 10 m los? >> 10 m nlos >> ?? >> Is this a fair question? >> >> Chuck Profito >> 209-988-7388 >> CV-ACCESS, INC >> [EMAIL PROTECTED] >> Providing High Speed Broadband >> to Rural Central California >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> On >> Behalf Of Patrick Leary >> Sent: Monday, April 21, 2008 9:14 AM >> To: WISPA General List >> Subject: Re: [WISPA] Future >> >> The press has been wrong most of time, causing companies like ours >> great >> headaches. The stupid "70 miles 30 mbps" was the most absurd bit of >> hyperbole that the press picked up and repeated endlessly. >> Meanwhile, Mo >> Shakouri (the Marketing VP of the WiMAX Forum and an Alvarion exec) >> was >> trying to dispel that at every turn (I sat in on many of his public >> sessions). Others of us also were trying to correct the >> expectations. I >> did it in numerous analyst and press interviews. >> >> WiMAX is also doing well overseas, especially in Asia. WiMAX's >> greatest >> near term challenge in the U.S. is Sprint. >> >> Patrick >> >> -----Original Message----- >> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> On >> Behalf Of Chuck McCown >> Sent: Monday, April 21, 2008 8:57 AM >> To: WISPA General List >> Subject: Re: [WISPA] Future >> >> WiMax as hyped by the press is dead. No? >> >> ----- Original Message ----- >> From: "Patrick Leary" <[EMAIL PROTECTED]> >> To: "WISPA General List" <wireless@wispa.org> >> Sent: Monday, April 21, 2008 9:52 AM >> Subject: Re: [WISPA] Future >> >> >>> I agree with the vast majority of what Chuck says here and only >>> partially disagree even on the WiMAX part (though I disagree strongly >> on >>> the "WiMAX is dead" part -- we have sold over $100M to date of it). >>> >>> The main takeaway with Chuck's post is that WISPs will have strong >>> opportunities for a long time to come, and I agree 110%. >>> >>> Patrick >>> >>> -----Original Message----- >>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] >> On >>> Behalf Of Chuck McCown - 2 >>> Sent: Sunday, April 20, 2008 9:26 PM >>> To: WISPA General List >>> Subject: Re: [WISPA] Future >>> >>> WiMAX was dead, is dead and will remain dead. OK, not factually true >>> but >>> emotionally true. The cell companies will use WiMax frequencies and >>> technologies but they will be a premium service and not well suited >>> to >>> compete with us for point to multi point fixed wireless. It will >> never >>> live >>> up to the hype. >>> >>> All the cell data technologies will remain premium for folks on the >> go. >>> Cell does not want to squander the bandwidth to go after the value >>> driven >>> customer that love us so much. Cell is and will not be value leader >> for >>> >>> fixed wireless. technologies. >>> >>> 700 MHz is just not going to be used for anything other than more >>> cell >>> spectrum. The bands are narrow. Good for phone and limited amounts >> of >>> data. Great propagation. Problem with 700 MHz is that the size of >>> the >>> antenna will be problematic for really small cell phones. Less gain >>> than >>> the current 900 and 1800 antennas for the same physical sizes. Also >>> there >>> will be a few years of implementation due to moving some existing TV >>> stations. And some of them are not moving for some reason. I don't >>> know if >>> they get a special dispensation or what. >>> >>> All ILECs will continue to build out with fiber to the home. That >> will >>> erode market share for WISPs in some areas. This is a slow and >> capital >>> intensive process so no reason to get jumpy on that. Plus many folks >>> prefer >>> to deal with us vs a large public traded company. Superior customer >>> service >>> and support will always retain the customer. >>> >>> The cable companies will continue to shoot themselves in the foot and >>> drop >>> the balls. They are sooo freaked out by the erosion of customer base >>> from >>> DirecTV that they are not managing the IP side of the house as well >>> as >>> they >>> could. They will continue to get in a tighter and tighter cash >>> situation >>> from satellite TV pressing from one side and the ILEC FTTH (and us) >> from >>> the >>> other. >>> >>> In the meantime, we add VOIP, computer repair, data backup, web >>> development, >>> OTA HDTV install and maint, etc as cross sell and up sell >> opportunities. >>> >>> All of us can offer triple play if we team up with DirecTV or OTA >> HDTV. >>> OTA >>> HDTV is a wonderful opportunity for the next 18 months for the value >>> conscious customer. Stock UHF TV antennas and converter boxes and >> help >>> folks get their analog TVs converted over. Less work than a WISP >>> install >>> and you will lock in the customer even more with superior customer >>> service. >>> You can rent them the gear for $5/month and make it a low cost >> package. >>> >>> In 5 years hopefully your investment will be a cash cow and you will >>> ride >>> this horse until it dies. Perhaps other technologies will come along >>> for us >>> to deploy but I see our segment strong for the next 5 years. In 10 >>> years, >>> if we have not diversified, we will probably be hurting. >>> >>> Oh, and satellite ISP will never do much. Pesky physics. >>> >>> ----- Original Message ----- >>> From: "Mike Hammett" <[EMAIL PROTECTED]> >>> To: "WISPA List" <wireless@wispa.org> >>> Sent: Sunday, April 20, 2008 6:44 PM >>> Subject: [WISPA] Future >>> >>> >>>> What do you see as the future of our industry over the next 5 years? >>>> >>>> AT&T is expanding U-Verse (will this be available outside of town?) >>>> Verizon is expanding FiOS (will this be available outside of town?) >>>> Cable will be using DOCSIS 3 >>>> 3G will gain more steam >>>> WiMAX will have larger and larger shares of the market >>>> 700 MHz will be in use possibly for data communications by the big >>> guys >>>> >>>> >>>> My banker asked me, so I figured I'd see what other's opinions are. >>>> >>>> My thought is that the big guys mentioned above will continue to >> avoid >>> the >>>> niche that we currently serve and we'll be able to provide better >>> services >>>> with more spectrum (5.4 GHz, additional 2.5 GHz, 3.6 GHz, possibly >>>> TV >>>> white spaces) and WiMAX. >>>> >>>> >>>> ---------- >>>> Mike Hammett >>>> Intelligent Computing Solutions >>>> http://www.ics-il.com >>>> >>>> >>>> >>>> >>> >> ------------------------------------------------------------------------ >>> -------- >>>> WISPA Wants You! 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