[GreenKeys] i-Telex, revisited...

[Henning Treumann]

Two things about i-Telex.
> 1. The machines run at 50 Baud, i..e. 66 WPM.
>     This why I'm working on an electronic dual speed control for my
>     LO-15b. To switch back and forth from 60 to 66 WPM easily.
> 2. Now I'm NOT positive about this, but the TTY port on the TW39 card
>     is set up to talk to what it expects for a machine on the line.
>
> The Lorenz Lo-15b that I have, using the Lorenz dialer unit does some
> things differently.
> 1. 5-7 mA idling current. i.e. On Hook, this lets the CO know that there
>     is a machine at the far end.
> 2. When you hit the AT (call button) the line current jumps up to 40 Ma.
> 3. There is a short break signal, 20 mS,  at this point that unlocks the
> dial.
> 4. When the circuit to the other machine is completed, the CO switches
>     (reverses) the line polarity. This closes the power relay to the TTY
>     machine and entire machine starts up.
> 5. When the call is completed (disconnected) the CO switches the line
>     polarity again, and the power relay turns the power to the machine
>     off.
>
> I'll have to ask Henning if that is how the TW39 port operates.
>


Yes, this is exactly how the TW39 Telex signalling operates.


>
> The reason I mention this is I'm not sure what the standard Western
> Union was using when a machine was connected for TWX service.
>

At least the TELEX network was working original TW39.
As I recall TWX was ASCII with model 33s, wasn't it?


Henning DF3OE
i-Telex: 92612






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>
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