[GreenKeys] iTelex Hardware

[Jeffrey D Angus]

On 5/14/2017 5:54 PM, keelan at beefchicken.com wrote:
> I've been roaming the translated version of i-telex.net, and looking
> at the hardware required to get on the network, and I was a bit
> surprised to see a ST-6 style of build with multiple cards and a
> backplane Is there a Steve Wozniak style "do it all in software"
> implementation of the hardware? Seems to me a Rasberry Pi
> connected to a RS-232 <-> 60mA loop adapter would be the only
> required hardware, the rest of the brains being implemented in
> software.
>
> Or am I missing something (I usually am)...
The back plane is there for flexibility.
There are three cards involved.
1. i-Telex controller that connects to the internet.
2. Power supply card.
3. Local cards.
     Dual TW-39 loops to local machines with call control units.
     TW-39 and Serial, one port is an ASCII port to talk to a terminal.
     USTTY which is set up for use with a Teletype machine without
     the call control unit.
Both the i-Telex card and the "local" cards have an Atmel micro-
computer that is programmed to do what is required.

For example, the TW-39 card looks like a TW-39 central office to
the local machine. So all the standard TW-39 hand shaking and
call dialing work just as if the machine were still connected to the
original TW-39 (Telex) network.




-- 
Jeff-1.0
wa6fwi
http://www.foxsmercantile.com


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