[hfsig] LinLink... PTC's risks

Haineault,Bruno bhaineault at dtwc.com
Fri Aug 20 17:57:55 EDT 2004

But you haven't addressed the important point of OEM survivability:

As the PTC-II and III waveforms are proprietary, what happens if SCS ceased
to exist? Would all of the users be left out in the cold?

I would only consider PTC-II/III for such an important task >IF< the OEM
agreed to move the waveform into the public domain. IMHO, an acceptable
alternative would be if they at least committed to move it into the public
domain IF they decide to close down.

MIL-STD-188-110A is public while several characteristics of 110B are still
licensable. However, as there are several 110B modem manufacturers out
there, I would be less worried if one vendor bit the dust. 

Putting all of your eggs into one basket (SCS') is risky as it is a
single-source protocol and there are no "legal" alternatives. 

Bruno, W6AFK

-----Original Message-----
From: tattje [mailto:tattje at planet.nl] 
Sent: Friday, August 20, 2004 2:48 PM
To: TAPR HF Modes SIG Mailing List
Subject: RE: [hfsig] RE: [linux] LinLink

Hi Robert,
I don't quite understand your comments about pactor 2.
It's not expensive because a waveform like that can run on any PC. LBT is
essential in auto-connect systems, but are we discussing these kind of
systems? I have seen very odd specs of systems like 2400 bits/sec at -10 dB
S/N? Wake up everyone! I think that going back to specs should be the first
thing to do. What is really needed: high throughput, high prob. of connect ?
Look at systems that are known to survive, by the way pactor 2 is one of
them, just as old ccir 625. The question nobody asked is: what is the
bandwidth available? more bandwidth means more throughput by the way, I
think everyone is just shouting, just take some time to think about what we
really need and what is possible. Regards Henk

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