Which I don't understand. Sounds like strong FEC?
On 1/13/2017 5:36 PM, Ken Hohhof wrote:
According to Link Planner, PTP820S (IP20S) gets around 243M at 256QAM,
347M at 2048QAM (350M with header compression). So add that to
George’s Trango/Exalt/SAF list.
*From:*Af [mailto:af-boun...@afmug.com] *On Behalf Of *Chris Gustaf
*Sent:* Friday, January 13, 2017 5:20 PM
*To:* af@afmug.com
*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
<mailto: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 <mailto: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 <mailto: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 <tel:%28305%29%20663-5518>
Help-desk: (305)663-5518 <tel:%28305%29%20663-5518> Option
2 or Email: supp...@snappytelecom.net
<mailto:supp...@snappytelecom.net>
------------------------------------------------------------------------
*From: *"Josh Baird" <joshba...@gmail.com
<mailto:joshba...@gmail.com>>
*To: *af@afmug.com <mailto: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 <mailto: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
<http://www.ics-il.com/>
_Midwest Internet Exchange_
_The Brothers WISP_
_
_<https://www.facebook.com/ICSIL>
------------------------------------------------------------------------
<https://www.facebook.com/ICSIL>
*From: *"Josh Baird" <_joshbaird@gmail.com_>
*To: *_af@afmug.com_
*Sent: *Thursday, January 12, 2017 11:47:42 AM
*Subject: *Re: [AFMUG] Our UBNT AF11x
experience<https://www.facebook.com/ICSIL>
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?<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
On Thu, Jan 12, 2017 at 12:05 PM, Gino Villarini
<_gav@aeronetpr.com_>
wrote:<https://www.facebook.com/ICSIL>
IIRC, PTP800 is Remec Style, you'll need Remec
to N connector adapters (AF11x is
N)<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
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<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
*From: *Af <_af-bounces@afmug.com_> on behalf
of Josh Baird <_joshbaird@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<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
Good news - thanks for
sharing.<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
Somewhat un-related
question:<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
I have a PTP-800 link using these
dishes:<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
_http://www.hol4g.com/AC/product.aspx?number=ANC-VHLP3-11W-RR1&p=237127&sc=0_<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
Do you know if I can re-use these dishes with
the AF11x? Do I need
adapters?<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
Josh<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
/*Gino Villarini*/
President
Metro Office Park #18 Suite 304 Guaynabo,
Puerto Rico 00968
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
On Thu, Jan 12, 2017 at 8:07 AM, Gino
Villarini <_gav@aeronetpr.com_>
wrote:<https://www.facebook.com/ICSIL>
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. <https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
We are very happy with its performance,
just wished it had a SFP port!
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
This unit replaced a Mimosa B11 unit that
we were having some intermitent
throughtput issues,
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
The swap was easy since we reused the
Jirous Dishes and only had to add the
af11x adapters to it,
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
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.
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
For UBNT, please add SFP port and continue
the good work towards a af6x and
af18x<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
/*Gino Villarini*/
President
Metro Office Park #18 Suite 304 Guaynabo,
Puerto Rico 00968
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
<https://www.facebook.com/ICSIL>
