There is a limit to physics, yes. However, we obviously have not met that if some manufacturers can produce products that do it.
MT N-Streme can do up to 2.25 bit/Hz throughput. Orthogon Spectra can do 10 bit/Hz, though I don't know if that's radio traffic or throughput. As it turns out, the Moto 400 series is only 21 megabit of throughput (according to their own marketing material), so that wouldn't qualify, but does 2.1 bit/Hz. WiMAX is around 2.5 bit/Hz, but is only available in tiny channels. 802.11n is available in cheap gear and does about 2.5 bit/Hz. The same arguments were used 10 years ago, but we've innovated and gotten past the previous "barriers of physics". ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------- From: "Jack Unger" <[EMAIL PROTECTED]> Sent: Monday, November 24, 2008 12:10 PM To: "WISPA General List" <wireless@wispa.org> Subject: Re: [WISPA] NetFlix Streaming Bandwidth Information > Mike, > > There are real physical limits to the amount of throughput that a radio > channel (X MHz wide) can handle. Ranting at manufacturers isn't going to > change this very much. You can only flow so much water through a pipe. > Increase the pressure without increasing the pipe diameter and the pipe > bursts. This issue is physics-based so ranting may make you feel better > but when you're done, the same physical constraints remain. This is why > having enough spectrum space (enough channels) is so important. Bottom > line is WISPs don't have enough spectrum space to deliver all that > throughput reliably to all those customers without creating interference > for every other network operator out there. > > jack > > > Mike Hammett wrote: >> <rant>This is why we need gear capable of higher throughputs. Too many >> WISPs out there don't press their manufacturers. They'd rather just put >> up >> a couple Canopy radios and complain on a list about how they can't >> deliver >> X, Y, or Z to a customer. >> >> I have complained to manufacturers. WiMAX is NOT the answer we are >> looking >> for. Most of the gear being released in the US is using small channel >> sizes, so small throughput. >> >> I will not purchase another AP unless it is able to deliver 40 mbit of >> throughput, end of story. Fortunately for me, they're out there... >> Mikrotik can (though uses a lot of spectrum). Deliberant is working on >> it. >> I believe the new Canopy is close. >> >> Orthogon can do 300 mbit in 30 MHz... expensive, but it can be done. >> Where >> are the engineers at the other companies? Where are the PtMP products? >> I >> haven't purchased any of their products, but from what I hear, Deliberant >> is >> going to do 70 mbit in 20 MHz by spring. Not as good as Orthogon, but a >> lot >> better than anyone else out there. 20 MHz of WiMAX could produce >> acceptable >> speeds, but no one is doing it. >> >> <sarcasm>Buying an $8k WiMAX AP that only does 15 megabit sounds like a >> great idea!</sarcasm>I could MAYBE see $8k for a TV whitespaces AP that >> supported bonding of several channels (say 4 or 5)... In 3650 or 5 gig, >> no >> thanks. >> >> Where has the innovation in the last few years gone?</rant> >> >> >> ----- >> Mike Hammett >> Intelligent Computing Solutions >> http://www.ics-il.com >> >> >> >> -------------------------------------------------- >> From: "Dennis Burgess" <[EMAIL PROTECTED]> >> Sent: Sunday, November 23, 2008 3:42 PM >> To: "WISPA General List" <wireless@wispa.org> >> Subject: [WISPA] NetFlix Streaming Bandwidth Information >> >> >>> In case you did not know, recently NetFlix and Microsoft teamed up to >>> provide video on-demand services to all of the XBox 360 users. Not only >>> can you start one of 12,000 videos in a matter of seconds on your >>> computer, but you can also do this right on your Xbox 360, bringing it >>> mainstream for many who have never used it. Not to mention the super >>> low cost of basically $9 bucks a month! >>> >>> I have been using it for a few weeks and since it came out on the XBox >>> 360 last Wednesday, I have streamed GIGs. Soon as you hear, gigs, you >>> may be interested to know what is required to maintain a high-end video >>> stream. So, I put together some numbers for everyone, in case you are >>> interested in how much bandwidth this service uses! A >>> >>> You can see my data at http://www.linktechs.net/netflix.asp. Feel free >>> to shoot me a e-mail off-list if you have any questions! >>> >>> ------------------------------ >>> * Dennis Burgess, CCNA, A+, Mikrotik Certified Trainer >>> Link Technologies, Inc -- Mikrotik & WISP Support Services* >>> 314-735-0270 >>> http://www.linktechs.net >>> <http://www.linktechs.net/> >>> >>> */ Link Technologies, Inc is offering LIVE Mikrotik On-Line Training >>> <http://www.linktechs.net/onlinetraining.asp>/* >>> >>> >>> >>> -------------------------------------------------------------------------------- >>> 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/ >> >> >> > > -- > Jack Unger - President, Ask-Wi.Com, Inc. > Serving the Broadband Wireless Industry Since 1993 > Cisco Press Author - "Deploying License-Free Wireless WANs" > WISPs - Do you know where your customers are? > For wireless coverage mapping see http://www.ask-wi.com/mapping > FCC Lic. #PG-12-25133 LinkedIn Profile > <http://www.linkedin.com/in/jackunger> > Phone 818-227-4220 Email <[EMAIL PROTECTED]> > > > > > > -------------------------------------------------------------------------------- > 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/
