Both adaptive channel sizes *and* adaptive modulation. Drop from 1250 MHz to 500 or 250 MHz, and drop from 32QAM all the way to BPSK if needed.
On Sat, Jan 20, 2018 at 9:57 AM, Mike Hammett <af...@ics-il.net> wrote: > Adaptive channel sizes? > > > > ----- > Mike Hammett > Intelligent Computing Solutions <http://www.ics-il.com/> > <https://www.facebook.com/ICSIL> > <https://plus.google.com/+IntelligentComputingSolutionsDeKalb> > <https://www.linkedin.com/company/intelligent-computing-solutions> > <https://twitter.com/ICSIL> > Midwest Internet Exchange <http://www.midwest-ix.com/> > <https://www.facebook.com/mdwestix> > <https://www.linkedin.com/company/midwest-internet-exchange> > <https://twitter.com/mdwestix> > The Brothers WISP <http://www.thebrotherswisp.com/> > <https://www.facebook.com/thebrotherswisp> > > > <https://www.youtube.com/channel/UCXSdfxQv7SpoRQYNyLwntZg> > ------------------------------ > *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 <(305)%20663-5518> >> >> Help-desk: (305)663-5518 <(305)%20663-5518> 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 >> <https://maps.google.com/?q=4226+S.+37&entry=gmail&source=g>th Street • >> Phoenix • AZ 85040* >> >> *602-426-0542 <(602)%20426-0542>* >> >> *r...@triadwireless.net <r...@triadwireless.net>* >> >> *www.triadwireless.net <http://www.triadwireless.net/>* >> >> >> >> “"Engineers believe that if it ain't broke, it doesn't have enough >> features yet." — Scott Adams >> >> >> >> >> >> > >
