ASR-33 Data Format?

From: Dwight Elvey <elvey_at_hal.com>
Date: Thu Apr 1 10:57:22 1999

Eric Smith <eric_at_brouhaha.com> wrote:
> > Are you claiming that it's impossible to have a modem where there are
> > 9600 transitions/second on the 'line' side? Because if so, I don't
> > believe you.
>
> I'm claiming that it's not possible to have a 9600 baud modem on a POTS
> line. Obviously it is possible on other transmission lines or media with
> greater bandwidth.
>
> > What was the official use of this stick? Some kind of packing/transit
> > clamping device?
>
> Yes.

I agree, it isn't possible to do 9600 transitions/second
on a POTS line. 9600 baud modems don't do 9600 transitions/second,
they encode more information with what is called quadrature
encoding. Don't confuse data encoding rates with transition
rates, they aren't the same.
Dwight
Received on Thu Apr 01 1999 - 10:57:22 BST