[65379] in Cypherpunks
Re: 56 kbps modems
daemon@ATHENA.MIT.EDU (Enzo Michelangeli)
Fri Sep 13 11:50:14 1996
Date: Fri, 13 Sep 1996 23:24:36 +0800 (HKT)
From: Enzo Michelangeli <enzo@ima.com>
To: Asgaard <asgaard@Cor.sos.sll.se>
Cc: cypherpunks@toad.com
In-Reply-To: <Pine.HPP.3.91.960913140446.12376A-100000@cor.sos.sll.se>
On Fri, 13 Sep 1996, Asgaard wrote:
> >U.S. Robotics and Rockwell International are planning new modems with
> >speeds up to 56 kbps a second, almost double the speed of the fastest
> >rate now available. The new devices should be available by the end of
> >the year, although their top speed initially may be less than 56 kbps.
> >(Wall Street Journal 12 Sep 96 B11)
>
> People who seemed to know used to say that 'the Shannon limit'
> set an absolute upper limit around 40 kbps. Has Shannon been
> proven wrong, or what?
Well, it all depends on the signal-to-noise ratio. Also, if the noise is
not white gaussian the situation can be even better.
Enzo
