> This is the first I've heard of adaptive channel sizes.. Not trying to throw a curve ball... but it is one of the 'quiet, open disclosed secret of the Mimosa A5/PTMP system :)
Regards. Faisal Imtiaz Snappy Internet & Telecom http://www.snappytelecom.net Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net > From: "Mathew Howard" <mhoward...@gmail.com> > To: "af" <af@afmug.com> > Sent: Saturday, January 20, 2018 1:04:15 PM > Subject: Re: [AFMUG] Quick comparison between 80GHz and AF24 > This is the first I've heard of adaptive channel sizes... I've been looking at > both Siklu and Bridgewater, and nobody from either company ever mentioned that > (that doesn't necessarily mean they can't do it though). > On Jan 20, 2018 11:58 AM, "Mike Hammett" < af...@ics-il.net > wrote: >> Adaptive channel sizes? >> ----- >> Mike Hammett >> Intelligent Computing Solutions >> Midwest Internet Exchange >> The Brothers WISP >> From: "Eric Kuhnke" < eric.kuh...@gmail.com > >> To: af@afmug.com >> Sent: Saturday, January 20, 2018 11:48:24 AM >> Subject: Re: [AFMUG] Quick comparison between 80GHz and AF24 >> This is not extremely new in 80 GHz, just with different and denser >> modulations. >> The Siklu 80 GHz stuff has done adaptive coding and modulation for a while. >> The >> (now 7 year old!) Bridgewave adaptrate 80 GHz stuff would maintain a 100 Mbps >> link during a rain fade, by switching a nominally QPSK-modulated 1500 MHz >> wide >> channel for 1 Gbps, temporarily down to BPSK during a rain fade event. >> On Sat, Jan 20, 2018 at 9:45 AM, Stefan Englhardt < s...@genias.net > wrote: >>> Some vendors do some new things to stretch the range of 80GHz: >>> http://de.nec.com/de_DE/global/prod/nw/pasolink/products/ipasolinkEX_advanced.html >>> ? >>> They modulate down and then reduce channel size. >>> This gear is in the 20kEuro Range … >>> Von: Af [mailto: af-boun...@afmug.com ] Im Auftrag von Faisal Imtiaz >>> Gesendet: Samstag, 20. Januar 2018 17:08 >>> An: af@afmug.com >>> Betreff: Re: [AFMUG] Quick comparison between 80GHz and AF24 >>> We have two things to contend with... >>> one is Oxygen Absorption >>> second is Rain Fade >>> Science says, 24ghz has much less O2 absorption fade vs 80ghz >>> Science also says that 24ghz has slightly less Rain fade vs 80ghz >>> Science also says that if on a particular link, if one is comparing 24ghz vs >>> 80ghz, the difference in which link drops first will be based on the TX >>> power / >>> Antenna Gain and Rx sensitivity. >>> If all things were exactly the same, then 80ghz would drop before 24ghz in >>> Rain >>> event. >>> But in reality, all things are not the same.. I believe 80ghz one is allowed >>> more power, and higher antenna gain. >>> https://www.e-band.com/index.php?id=86 >>> https://www.linkedin.com/pulse/dont-fall-siklu-overbuilds-distance-claims-david-theodore >>> at 3.5miles, one is pushing the limits of both 24gzh as well as 80ghz.. >>> Depending on what you are trying to achieve, and the rainzone, you can make >>> your choice based on what will perform better normally... cause both of them >>> will go out in rain :) >>> Best of Luck >>> Faisal Imtiaz >>> Snappy Internet & Telecom >>> http://www.snappytelecom.net >>> Tel: 305 663 5518 x 232 >>> Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net >>>> From: "Mathew Howard" < mhoward...@gmail.com > >>>> To: "af" < af@afmug.com > >>>> Sent: Friday, January 19, 2018 8:42:31 PM >>>> Subject: Re: [AFMUG] Quick comparison between 80GHz and AF24 >>>> I'd guess 24ghz would be slightly better, but either one is going to drop >>>> at >>>> that distance if you ever get heavy rain. >>>> Somebody from Siklu told me at one time, that some of their customers have >>>> told >>>> then that their rainfade is slightly better than an AF24, but slightly >>>> worse >>>> than an AF24HD... how accurate that is, I don't know. >>>> On Jan 19, 2018 6:03 PM, "Rory Conaway" < r...@triadwireless.net > wrote: >>>>> I haven’t run the numbers so please save me some time. Which one has less >>>>> fade >>>>> margin at 3.5 miles? I was going to use Siklu with a 2’ antenna. >>>>> Rory Conaway • Triad Wireless • CEO >>>>> 4226 S. 37 th Street • Phoenix • AZ 85040 >>>>> 602-426-0542 >>>>> r...@triadwireless.net >>>>> www.triadwireless.net >>>>> “"Engineers believe that if it ain't broke, it doesn't have enough >>>>> features >>>>> yet." — Scott Adams
