[GreenKeys] Dataset tones?

[Chris Elmquist]

On Saturday (09/01/2012 at 10:01PM -0500), Jim Haynes wrote:
> On Sat, 1 Sep 2012, Jack wrote:
> 
> >
> >1070/1270 HZ
> >
> > 
> >
> >2025/2225 HZ
> >
> That's the first part of the answer.  Now which pair is originate and
> which pair is answer, and which of which pair is mark and which is
> space.  You see the possibility of eight different, mutually-incompatible
> services with those variables.  One was TWX, one was DataPhone, one was
> to be WADS, one was to be WADS-prime (whatever THAT was) and there are
> still four left over for other services.

 from http://en.wikipedia.org/wiki/Bell_103_modem,

    The originating station used a mark tone of 1,270 Hz and a space
    tone of 1,070 Hz.

    The answering station used a mark tone of 2,225 Hz and a space tone
    of 2,025 Hz.

-- 
Chris Elmquist