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: > > 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 Solutionshttp://www.ics-il.com > > ----- Original Message ----- > From: Matt Hardy <m...@ubnt.com> <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> > <af...@ics-il.net> wrote: > > > 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 Solutionshttp://www.ics-il.com > > ------------------------------ > *From: *"Matt Hardy" <m...@ubnt.com> <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> > <af...@ics-il.net> wrote: > > > 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 Solutionshttp://www.ics-il.com > > ------------------------------ > *From: *"Craig House" <cr...@totalhighspeed.net> <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 > > > > >
