Excellent point about the effect of delay on throughput. I had
forgotten about that before I ranted about licenses. Sometimes I need a
leash I think.
On 8/10/2015 11:00 AM, Ken Hohhof wrote:
Maybe the notable thing about this announcement is that the ranging
mechanism went all the way to whatever air delay 245 km corresponds
to. You’d think it would exceed max distance.
And that brings up the impact of delay on throughput. You would
probably have to run a path calc in Link Planner to account for this.
I know that even a few miles starts to eat into throughput on
PTP300/500/600 because of the time waiting for bits to fly through the
air before switching TDD direction. That is basically dead time, with
neither side transmitting.
Which makes you wonder what a FDD system could do at the same distance
and S/N.
Or I believe airFiber TDD has a method where instead of waiting for
your bits to fly through the air and reach me before I transmit back
to you, I do the opposite, and transmit WHILE the bits are flying
through the air. Actually, I don’t really understand how this works.
If someone knows of a whitepaper on it, point me to it. But if my
understanding of it is anything close to correct, it should work as
well or better on long paths because the bits spend a lot of time in
flight.
*From:* Lewis Bergman <mailto:lewis.berg...@gmail.com>
*Sent:* Monday, August 10, 2015 9:39 AM
*To:* af@afmug.com <mailto:af@afmug.com>
*Subject:* Re: [AFMUG] PTP 650 Sets New Wireless Broadband Link Record
of 245km
Cambiums issue, I think, is that they are playing two different
markets and can't balance the two. Public Safety will pay those kind
of ridiculous license fee structures while I don't think anyone who
needs most or all of a link from the beginning will. Maybe they looked
at their financials and figured they would make up the lost revenue
from WISPS and carriers with that Public Safety segment.
Not sure about the -76 and throughput. To lazy to do the math to
figure what QAM that should be. I should restate that....I am to lazy
to learn how to do the math to determine what the QAM should be at -76.
On Mon, Aug 10, 2015 at 9:16 AM, Adam Moffett <dmmoff...@gmail.com
<mailto:dmmoff...@gmail.com>> wrote:
seriously though, I argued to death with Cambium that the bit
stuffing license was complete crap. It's also not represented
accurately in their literature. IE 100mbps license is not license
for 100mbps, it's a license for a certain fraction of the over the
air rate and IMO it should be labeled and sold as such.
On 8/10/2015 10:14 AM, Adam Moffett wrote:
burrrrrrn
On 8/10/2015 9:59 AM, Andreas Wiatowski wrote:
Maybe it only has the Lite license. ;.>
Cheers,
______________________________
Andreas Wiatowski | CEO
Silo Wireless Inc.
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*From:*Af [mailto:af-boun...@afmug.com] *On Behalf Of *Mike Hammett
*Sent:* August 10, 2015 9:36 AM
*To:* af@afmug.com <mailto:af@afmug.com>
*Subject:* Re: [AFMUG] PTP 650 Sets New Wireless Broadband Link
Record of 245km
Am I reading that right, 45 MHz for 30 megabit? I know it's a
long distance, but what was the throughput limitation? Signal to
noise? What were the identified noise sources? Local, along the
path, remote, etc?
-----
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>
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------------------------------------------------------------------------
*From: *"Ray Savich" <ray.sav...@cambiumnetworks.com
<mailto:ray.sav...@cambiumnetworks.com>>
*To: *"af@afmug.com <mailto:af@afmug.com>" <af@afmug.com
<mailto:af@afmug.com>>
*Sent: *Wednesday, August 5, 2015 2:54:36 PM
*Subject: *Re: [AFMUG] PTP 650 Sets New Wireless Broadband Link
Record of 245km
We were using 3 ft. standard performance dishes from tire-mount
masts at 5.8 GHz.
Ran the link at 5, 30 and 45 MHz channels and had receive
signals of approximately -76 dBm even while battling some pretty
heavy winds. We were running a high-def video link and a VoIP
server over the channel. Consistently stayed above 30 Mbps which
is what we had designed the link for. The link was established
with both PTP 650 and PTP 700.
The link came up fast and we were testing out the applications
after less than an hour on site.
LINKPlanner does take the curvature of the earth (and altitude)
into consideration.
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--
Lewis Bergman
325-439-0533 Cell
