[GreenKeys] Acoustic Coupler

[Jim Haynes]

On Sat, 15 Oct 2011, Larry Tighe wrote:

> Howdy Experiend,
>
> I've fired up a Model 33ASR with the acoustic coupler on the right side.  It
> has a "Carrier" lite, Originate and Answer along with full or half duplex
> switches.  The handset lies in the proper recptacles...above the indicator
> and switches.
>
> The Anderson Jacobsen modem is connected to the acoustic coupler.  I'm not
> having much luck getting it to talk to a Telex machine.  So my question is,
> were these for private line type operations or should they interact with a
> standard dial up Telex machine?
>
I would not expect it to talk to a Telex machine.  These were made for
calling in to computer time sharing services.  I don't even know what
a "standard dial up Telex machine" is - the original Telex used a DC
loop rather than a modem.  If you are talking about a TWX machine, there
are some options that are different between the two.

There are two pairs of tones, either of which can be used for originate
or answer, and then either of them independently can have the higher
tone be mark or space.  So that allows for eight different mutually
incompatible services.  One was TWX, one was DataPhone which is the
computer time sharing service, one was for WADS (a service that did not
get FCC approval) and there was to have been something called
WADS-prime as well.