UBNT had a long distance PR not long ago. How far and how fast?
----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com Midwest Internet Exchange http://www.midwest-ix.com ----- Original Message ----- From: "Ken Hohhof" <af...@kwisp.com> To: af@afmug.com Sent: Monday, August 10, 2015 10:00:34 AM Subject: Re: [AFMUG] PTP 650 Sets New Wireless Broadband Link Record of 245km 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: <blockquote> burrrrrrn On 8/10/2015 9:59 AM, Andreas Wiatowski wrote: <blockquote> Maybe it only has the Lite license. ;.> Cheers, ______________________________ Andreas Wiatowski | CEO Silo Wireless Inc. Email andr...@silowireless.com 19 Sage Court Brantford, Ontario N3R 7T4 (CANADA) Tel +1.519.449.5656 Extension-600 |Fax +1.519.449.5536 |Toll Free +1.866.727.4138 Website http://www.silowireless.com/ | Facebook http://www.facebook.com/silowireless | Twitter @silowireless This electronic message and all of its contents and attachments contain information from the offices of Silo Wireless Inc., which may be privileged, confidential or otherwise protected from disclosure. The information is intended to be for the addressee only. If you are not the addressee, then any disclosure, copying, distribution or use of this message, or its contents or any of its attachments, is prohibited. If you have received this electronic message in error, please notify us immediately and destroy the original message and all copies. 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. Join the Conversation Cambium Networks Community Forum </blockquote> </blockquote> -- Lewis Bergman 325-439-0533 Cell