baud modifier

M H Stein dm561 at torfree.net
Tue Mar 13 15:28:19 CDT 2007


----------------Original Message:
Date: Mon, 12 Mar 2007 13:24:49 -0700 (PDT)
From: Fred Cisin <cisin at xenosoft.com>
Subject: Re: baud modifier

In addition to the speed, are the protocols the same?
For example, if you were to just slow down a Bell 212 (1200 bps) modem to
300 bts per second while still using the same frequencies and encoding,
that would NOT enable a Bell 103 to be able to communicate.  It would ALSO
be necessary to switch the encoding to a FSK using the Bell 103
frequencies.

I could certainly feed 10 characters per second through a V.90.
But that would NOT provide the CCITT V.18? protocol needed for most 110
baud devices.

--------------Reply:
And then there may be the little matter of RS-232 <> current loop conversion...

m





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