[GreenKeys] Teleprinter over Internet.

[Keelan Lightfoot]

Martin,

I'm in the early stages of creating a TTY over IP interface, that will simplify connecting teletypes over the internet. If you search through the greenkeys archives for TTYoIP, you will be able to read a bit more about this.

- Keelan

On 2011-11-11, at 3:47 AM, Martin wrote:

> In response to my own question, and I am surprised no one else has 
> beaten me over the head yet, of course tty is possible over Internet as 
> that's what ITTY is doing.
> 
> So the problems I have seen are Asterisk issues and maybe related to 
> using a gateway. I will report back when I can get a colleague in Bath 
> set up for a direct connection with CNET and his creed 444.
> 
> Martin
> 
> On 10/11/2011 18:13, Martin wrote:
>> I wonder if anyone on this list has tried to achieve teleprinter over
>> Internet?
>> 
>> I have a system using 80 volt to RS232 signaling conversion and then
>> using ordinary 200 baud V21 data modems to exchange data.
>> 
>> I have very successfully sent Telex from a message generator to my No 15
>> over my U13 telephone exchange at home, and also over the BT network, at
>> least as far as my local exchange and back (2.5 miles each way), all
>> error free over a few dozen lines of quick brown fox. So I have no
>> reason to doubt the system should work further, as well as data modems
>> ever did, especially since digitisation of the phone network.
>> 
>> However, I am disappointed with CNET. My suspicions seem to be well
>> founded, in that over the Internet timing gets screwed up such that the
>> error rate is very high. In printing a few dozen lines of The quick
>> brown fox, the chances of getting one line without error are small, and
>> many are completely garbled. My broadband connection may not help, as I
>> only get 500k download and worse upload, but generally voice connections
>> have sounded pretty good, but obviously they are not as good as they
>> sounded!.
>> 
>> I have used gateway facilities,  so its a double journey and in either
>> case the problem was much the same, but I suspect the problem will be
>> the same even in one hop. Even leaving the circuit standing at Mark
>> there is a dropout several times a minute causing an error print.
>> 
>> Martin
>> 
> 
> 
> -- 
> --
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> http://www.ckts.info/192/uk
> 
> This Email personally scripted by: Martin
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