[GreenKeys] I-Telex...

Mon Jul 6 15:40:53 EDT 2015

this  would   be neat to install here a the   communications museum
need  more  details and  a contact  source for  finished   hardware  
controller.
Thanks  Ed Sharpe Archivist  for SMECC

In a message dated 7/6/2015 12:26:41 P.M. US Mountain Standard Time,  
greenkeys at mailman.qth.net writes:

Hi Ken and others,

here comes a brief description and  history of "our" system:

All started with Philipp Hachtmann and  me around the year 2000. We wanted 
to get our old machines,

mostly  from German Telex service, online as close as possible to the 
original use of  them.

Philipp developed a microcontroller board that "emulated" the  original 
Telex TW 39 switch 

and communicated with other users by an  old style V.21 standard modem over

ordinary phone lines. As most of  the people here in Germany had ISDN lines 
at home, even

a separate  number for the Telex for 24/7 operation was no problem.

We called it TelexPhone or TXP. The group was growing more and more  and

we had a lot of fun using it and still have.

The next step back about 7 years ago was to develop a modular system,  
based on here

well known industrial standard Eurocard system. A standardized size for  
PCBs used

for industrial applications, fitted into 19" racks. You can say, a Telex  
switch in a shoebox. All made possible through microcrontrollers.
We used  this Eurocard/19" system as all mechanical parts are easy and 
cheap to  obtain

from surplus and fleamarket sources. But all was still based on phone  
modem operation.

But since more and more telco operators migrated  their POTS networks into 
IP-based

systems and modem operation over  those networks became harder and harder,

the main developer of the  new so called TXP2 system, Fred Sonnenrein, 
developed a

way to  establish connections directly IP based with the use a of Telnet 
socket  invisible
and unnoticable in the background.  Althogh no exact real  time protocol,

for the end user stil look and feel like real time as transmission is  still

character by character.

This system we have called i-Telex. As the boards has got its  own

webserver, it is also possible to send messages thru a web  interface

directly to the teleprinter or even send emails to and from the  
teleprinter,
as far as the email-server works without SSL. That would be to  much
for the tiny microcontroller.. ;-)
Now it was easy to connect also  other countries than Germany without

ISDN or real analoge lines as the internet protocol is a real world  
standard.

For our members that still use the old modem based system we  have

installed a gateway to connect both "worlds", TelexPhone and  i-Telex.

That's for the introducion and now the answers to your  questions:

Saw a posting recently, with a video link showing  I-Telex...

I am very interested to know how this  "Works"...

see above

If there is anyone stateside using this program(?), perhaps  it cud be 
explained

a  bit...

until now, only Europeans and Australians use the system.

It's not a program and totally PC (computer) independend.

You can call it a syste, rather than a just a  program.

It seems to be European in nature, from what I can see in the  video... It 
has a hardware/interface

package and a driver program  to allow it to communicate with other I-Telex 
users via the  Internet...

exactly, that's the way how it works.

I have a Model 32ASR which I wud like to operate on this type of  
application, mimicking the original

Telex service as operated by  Western Union in the US, and CNCP telecomm'ns 
here in  Canada...

perfect ! :-) I would say that your Telex model 32 is directly  connectable

to the i-Telex system, same like any other machines that were connect  to

Telex service (or TW39) networks.

As with both Telex services, the dialer, when the "Start"  button is 
pressed, the internal dial box idle resistance

is shunted  allowing a rise in line current to full 20ma or 60ma, depending 
on exchange  types and dial

board types...When the idle line current is  increased, by the shunting 
effect, the exchange, typically

Siemens  TW39, or TWK, responds with a "Revertive pulse" (RP), allowing the 
proceed  to dial lamp to

light, and permitting dial-out...After dialing  train is completed, and the 
exchange connects the  distant

subscriber, the exchange reverses the loop polarity, both  machines "Turn 
on" and communication

proceeds between  the two  subscribers...

exactly, this is the way TW39 and our system works. :-) 

>From what I can see in the video, this software/hardware  setup does 
exactly that...

Wud be really neat to have this  service available for us who have ex-Telex 
 machines...

You and everyone around the world are welcome to join us !

My questions are:

What is needed and where does one obtain  the necc'y hardware/software

packages? Is it shelf available, or  does it have to be  scratchbuilt?

boards are available from me. For "export" only as already built and  

tested boards (no kits) to avoid building mistakes. Of course  same

price as kits. Just to notice. This is an absolutely non profit  project.

Our only aim is to make the list of members longer and longer.  :-)

As the Telex machines (North American), are DC line driven vs  F1F2 
signalling in Europe,

can this I-Telex package/program work on  our machines here?

we are working on interfaces for any world wide used standard.

So far we have teleprinter interfaces for:

- single current (40/60ma)

- double current (+/- 20ma)

- ED1000 (German F1F2 standard)

- (V.21 F1F2 Telex standard in development) 

we are working also on an interface to connect USTTY 45 bauds/60 wpm  
machines without Telex control unit. Speed converson to the existing 50 bauds  / 
66wpm network with Telex procedures will be done by the i-Telex  system.

Hopefully, this msg will generate some chatter, as I haven't.  seen much 
mention of

it  before...

unfortunately not ;-) but I have to agree the until now most of the  
information of our system has been on German language  websites.

Many thanks to all who can contribute to this fascinating  application...

Everyone is welcome to join our network and group and  contribute

his skills.

Please don't hesitate to contact me for further  questions directly.

Have fun!

Henning DF3OE

_www.teleprinter.net_ (http://www.teleprinter.net/) 

i-Telex: 92612 / 55571

i-Telex board website: _http://df3oe.no-ip.org_ (http://df3oe.no-ip.org/) 

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