I am looking for the amount of signal I need over all sources of noise, interference, bad things, etc. (collectively known in the WISP industry as noise) per modulation.
I want to poke numbers into Radio Mobile, get a signal, subtract the observed noise by my existing equipment and compare that number to the per modulation requirements to know how fast I can go. The Tx numbers seem to be easy enough to determine... put them in the datasheet. I don't want to have to buy an AF5 just to use the AF5's built-in calculator. Now I buy an AF24 just to use that calculator. Now I buy an AF24HD to use its calculator. UBNT seems to love the calculator, but I'm not going to spend $11k to get three expensive calculators. Is UBNT afraid of confusing the enterprise folks with a table of numbers they don't understand? Is there something in the numbers they're embarrassed of? Again, I provided screen shots of existing UBNT documentation showing the desired numbers for other UBNT products. I'm not asking for SFP interfaces or anything like that. ;-) "How hard can it be?" - Jeremy Clarkson I believe UBNT has now expended more effort avoiding complying with the request than if they had just done it. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ----- Original Message ----- From: "Chuck Macenski" <ch...@macenski.com> To: af@afmug.com Sent: Monday, January 12, 2015 9:44:30 PM Subject: Re: [AFMUG] Af5 Hi, I believe the number you are looking for is the sensitivity per modulation rate minus the base noise floor for a given bandwidth (see Matt's earlier post). This gives you the required signal over the noise floor. If the noise floor goes up, the effective sensitivity goes up accordingly. What am I missing? Chuck On Mon, Jan 12, 2015 at 5:23 PM, Josh Reynolds < j...@spitwspots.com > wrote: This. josh reynolds :: chief information officer spitwspots :: www.spitwspots.com On 01/12/2015 11:00 AM, Mike Hammett wrote: <blockquote> Matt, that doesn't really help. In many areas, my noise/interference/whatever is -75. If I knew how much margin was required per modulation, I could figure out how much signal I need for that speed. I can't do that with your published numbers. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ----- Original Message ----- From: Matt Hardy <m...@ubnt.com> To: af@afmug.com Sent: Mon, 12 Jan 2015 12:42:52 -0600 (CST) Subject: Re: [AFMUG] Af5 Hi Mike, The numbers in our datasheet do convey the SNR (which assumes AWGN for noise value); this is pretty standard among all our datasheets. The noise floor value varies based on channel BW, so a rough estimate for noise floor would be (50MHz=-97dBm, 40=-98dBm, 30=-99dBm, 20=-101dBm, 10=-104dBm). As far as transmit power / modulation, all modulations up to 64QAM can run at full transmit power. 256QAM is ~2dB lower, and 1024QAM is something like 4dB lower (it depends on other external factors). All of this and more is already provided with the integrated link configuration tool, including channel bandwidth, duplex frequency spacing, TX power and a bunch of other stuff. It's recommended to use this tool to configure links because of all of the additional factors. But if you need to run a simple link calc to estimate a link's performance at certain distance, you should have enough info. Hope that helps... -Matt On Sat, Jan 10, 2015 at 10:06 AM, Mike Hammett <af...@ics-il.net> wrote: <blockquote> Not at all, Matt. Those are receive sensitivities. The left side of this picture is needed for the airFibers. You publish the right side only. This information is also not available for the airFibers. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ------------------------------ *From: *"Matt Hardy" <m...@ubnt.com> *To: * af@afmug.com *Sent: *Friday, January 9, 2015 5:34:43 PM *Subject: *Re: [AFMUG] Af5 This? [image: Inline image 1] On Thu, Jan 8, 2015 at 5:18 PM, Mike Hammett <af...@ics-il.net> wrote: <blockquote> Hard to tell because they won't publish their Tx and SNR requirements. I'd just make educated guesses and plug it into a path calc. BTW: Ben, Matt... where are those numbers? ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com ------------------------------ *From: *"Craig House" <cr...@totalhighspeed.net> *To: * af@afmug.com *Sent: *Thursday, January 8, 2015 3:24:58 PM *Subject: *[AFMUG] Af5 I have used some AF 24 hours but no AF5 for backhaul yet what is the max distance people are seeing for the AF 5 at full modulation Sent from my iPhone </blockquote> </blockquote> </blockquote>
