Cool ! Thanks for the great explanation in simple language !
And what you have said makes a lot of sense in AF11x showing to be a 500meg Duplex on a 40mhz (mimo / two polarities) channel. Regards. Faisal Imtiaz Snappy Internet & Telecom 7266 SW 48 Street Miami, FL 33155 Tel: 305 663 5518 x 232 Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net > From: "Chris Gustaf" <ch...@trangosys.com> > To: af@afmug.com > Sent: Friday, January 13, 2017 6:19:49 PM > Subject: Re: [AFMUG] Our UBNT AF11x experience > Real usable capacity at Layer 2 Ethernet depends on several variables besides > the modulation level and the regulatory bandwidth. For 1024 QAM there are 10 > bits per symbol so theoretically one would expect to get 400 Mbps in a 40 MHz > channel (10 bits x 40 MHz symbol rate). > To actually make a radio that meets FCC spectrum masks, a reduction of the > symbol rate down to around 35 MHz is required plus filtering, giving a max of > 350 Mbps over the air. > After that, Forward Error Correction (FEC) is required which is typically > around > 85-90 % for most microwave radios using LDPC, giving a net throughput of > around > 300 to 315 Mbps. > Add header compression at layer 2 which in the worst case for large packets > adds > about 2.5 % improvement and you get to around 325 Mbps, which is what Trango > and others get on a single 40 MHz channel with the newest technology. > Ubiquiti maybe using a lower FEC rate like 75-80% (or a lower symbol rate if > the > filtering is not steep enough) and no header compression, which would give > them > about 250 Mbps for large packets. > Hope that helps! > Chris Gustaf > Trango Systems > On Fri, Jan 13, 2017 at 2:39 PM, Mathew Howard < mhoward...@gmail.com > wrote: >> What other radios will only do 250Mbps (502.4Mbps capacity according to the >> data >> sheet...) on one 40mhz single polarity channel at 256qam? The other's I've >> looked at are typically around 300Mbps... >> Not that I'm saying the AF11 is a bad radio, I plan on putting up at least a >> few >> of them this year... but I find it a little funny that they use 1024qam as a >> selling point, when it can't do as much throughput at 1024qam as other radios >> do at 256qam. >> On Fri, Jan 13, 2017 at 4:19 PM, Eric Kuhnke < eric.kuh...@gmail.com > wrote: >>> I think this whole thread can be summed up that there's no magical way to >>> get >>> around the shannon limit and bps/Hz coding efficiency for a given channel >>> size >>> and modulation... From the technical perspective of people who have to >>> really >>> understand the FDX capacity of a new PTP link, the ubnt marketing >>> department is >>> divorced from reality, it's not 1200 Mbps no matter how many slick PDFs they >>> publish. >>> One 40 MHz channel single polarity at 1024QAM 5/6 code rate is going to be >>> nearly the same efficiency bps/Hz from many different manufacturers. >>> Multiply >>> as necessary for dual polarity or for larger channel sizes such as 60, 80 or >>> 112 MHz. >>> On Fri, Jan 13, 2017 at 9:38 AM, Faisal Imtiaz < fai...@snappytelecom.net > >>> wrote: >>>> FYI... on a "single" 40mhz channel 'dual polarity' (mimo) the expected >>>> throughput on Af11x is 500meg duplex. >>>> Faisal Imtiaz >>>> Snappy Internet & Telecom >>>> 7266 SW 48 Street >>>> Miami, FL 33155 >>>> Tel: 305 663 5518 x 232 >>>> Help-desk: (305)663-5518 Option 2 or Email: supp...@snappytelecom.net >>>>> From: "Josh Baird" < joshba...@gmail.com > >>>>> To: af@afmug.com >>>>> Sent: Friday, January 13, 2017 10:30:10 AM >>>>> Subject: Re: [AFMUG] Our UBNT AF11x experience >>>>> But if I can get 80mhz channels in both polarities (running at >>>>> 56Mhz/1024QAM >>>>> with this radio), I should be able to at least double he capacity of my >>>>> PTP-800 >>>>> link which can do 228Mbps. Right? >>>>> On Thu, Jan 12, 2017 at 5:55 PM, Mike Hammett < af...@ics-il.net > wrote: >>>>>> At 40 MHz and a single polarity, you're looking at an almost >>>>>> insignificant >>>>>> increase in throughput. >>>>>> Their claim is 1.2 gb+. >>>>>> Cut that in half as they're advertising the aggregate, so 600 mb+. >>>>>> That's using both polarities, so now only 300 mb+. >>>>>> Only I haven't heard of anyone getting much more than 500 in a single >>>>>> direction >>>>>> (they may certainly exist, I just haven't seen them), so now that 300 is >>>>>> really >>>>>> only 250. >>>>>> Not much of an upgrade unless you can also get larger channels in both >>>>>> polarities. >>>>>> ----- >>>>>> Mike Hammett >>>>>> Intelligent Computing Solutions >>>>>> Midwest Internet Exchange >>>>>> The Brothers WISP >>>>>> From: "Josh Baird" < joshba...@gmail.com > >>>>>> To: af@afmug.com >>>>>> Sent: Thursday, January 12, 2017 11:47:42 AM >>>>>> Subject: Re: [AFMUG] Our UBNT AF11x experience >>>>>> This PTP800 is only capable of running at 40Mhz (ODU-A) so it can only do >>>>>> 228Mbps full-duplex. The AF11x should be able to do much more than that, >>>>>> right? >>>>>> On Thu, Jan 12, 2017 at 12:05 PM, Gino Villarini < g...@aeronetpr.com > >>>>>> wrote: >>>>>>> IIRC, PTP800 is Remec Style, you'll need Remec to N connector adapters >>>>>>> (AF11x is >>>>>>> N) >>>>>>> What do you expect to achieve with this upgrade? Not much capacity >>>>>>> difference >>>>>>> between PTP800 and AF11x, maybe 50-80- mbps more. Only if you have a >>>>>>> xpic >>>>>>> license you can double your throughput with the af11x >>>>>>> From: Af < af-boun...@afmug.com > on behalf of Josh Baird < >>>>>>> joshba...@gmail.com >>>>>>> > >>>>>>> Reply-To: " af@afmug.com " < af@afmug.com > >>>>>>> Date: Thursday, January 12, 2017 at 9:12 AM >>>>>>> To: " af@afmug.com " < af@afmug.com > >>>>>>> Subject: Re: [AFMUG] Our UBNT AF11x experience >>>>>>> Good news - thanks for sharing. >>>>>>> Somewhat un-related question: >>>>>>> I have a PTP-800 link using these dishes: >>>>>>> http://www.hol4g.com/AC/product.aspx?number=ANC-VHLP3-11W-RR1&p=237127&sc=0 >>>>>>> Do you know if I can re-use these dishes with the AF11x? Do I need >>>>>>> adapters? >>>>>>> Josh >>>>>>> Gino Villarini >>>>>>> President >>>>>>> Metro Office Park #18 Suite 304 Guaynabo, Puerto Rico 00968 >>>>>>> On Thu, Jan 12, 2017 at 8:07 AM, Gino Villarini < g...@aeronetpr.com > >>>>>>> wrote: >>>>>>>> Hey all, just dropping by to share our experience with AF11x, we habe >>>>>>>> been beta >>>>>>>> testing the unit since Sept and for the last 3 months, the unit has >>>>>>>> been rock >>>>>>>> solid. >>>>>>>> We are very happy with its performance, just wished it had a SFP port! >>>>>>>> This unit replaced a Mimosa B11 unit that we were having some >>>>>>>> intermitent >>>>>>>> throughtput issues, >>>>>>>> The swap was easy since we reused the Jirous Dishes and only had to >>>>>>>> add the >>>>>>>> af11x adapters to it, >>>>>>>> The link went live on 9/21/16 and on the first weeks we experienced >>>>>>>> some >>>>>>>> lockups, but after a revised beta fw was applied, all issues went away. >>>>>>>> For UBNT, please add SFP port and continue the good work towards a >>>>>>>> af6x and >>>>>>>> af18x >>>>>>>> Gino Villarini >>>>>>>> President >>>>>>>> Metro Office Park #18 Suite 304 Guaynabo, Puerto Rico 00968
