No, your point about how their license key works is a very valid complaint. It
is their right to sell license keys, but they need to be transparent about how
it works, and cutting the air capacity of the link in half is an unusual
approach.
From: Adam Moffett
Sent: Monday, August 10, 2015 10:05 AM
To: af@afmug.com
Subject: Re: [AFMUG] PTP 650 Sets New Wireless Broadband Link Record of 245km
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
Sent: Monday, August 10, 2015 9:39 AM
To: 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> 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,
______________________________
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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
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
Midwest Internet Exchange
http://www.midwest-ix.com
------------------------------------------------------------------------
From: "Ray Savich" <ray.sav...@cambiumnetworks.com>
To: "af@afmug.com" <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
