Michael Coslo wrote:

...
John I might respectfully suggest that you do a little studying on
the nature of digital signals. I've been dealing with them since the
late 70's, and they aren't anywhere near as robust as you believe.

- 73 de Mike KB3EIA -

It is as if you have looked at one form of plant life and declared all
plant life the same.

How you choose to implement digital, timing with pulses, pulse
durations, etc., or any combination--takes digital into the world of
variety. Although it can be difficult to get the machine code out of a
modems hardware and study it (really impossible for the avg computer
user), astute hacker/programmers do it all the time.

You are stuck in the "already all is known world" and see every new and
interesting problem as halting to that technology in question. Mans
history reveals such thinking to be the lie it is.

We deal in computers, we deal in a world where nothing is
impossible--some things just ain't been done yet ...

Regards,
JS