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 <[email protected]> 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:[email protected]] *Im Auftrag von *Faisal Imtiaz > *Gesendet:* Samstag, 20. Januar 2018 17:08 > *An:* [email protected] > *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: > [email protected] > > > ------------------------------ > > *From: *"Mathew Howard" <[email protected]> > *To: *"af" <[email protected]> > *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" <[email protected]> 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>* > > *[email protected] <[email protected]>* > > *www.triadwireless.net <http://www.triadwireless.net/>* > > > > “"Engineers believe that if it ain't broke, it doesn't have enough > features yet." — Scott Adams > > > > > >
