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EDT [European Deaf Telephone] and EDTN are the TDD [Telecommunications Device for the Deaf] protocol

Discussion in 'Electronic Design' started by Radium, Aug 27, 2007.

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  1. Radium

    Radium Guest

    Hi:

    I've posted this before but never got a rational scientific response.
    Sorry for the repetition and any annoyance it causes but I am really
    interested in this.

    EDT [European Deaf Telephone] and EDTN are the TDD [Telecommunications
    Device for the Deaf] protocols used in Switzerland. Where can I find
    technical information about the EDT/EDTN? Also, I would like to hear
    some tones resulting from the remote EDTs/EDTNs located in
    Switzerland. I live in USA, so if I dial an EDT/EDTN number to
    Switzerland, I will hear both the EDT/EDTN tones as well as the tones
    resulting from negotiations among international telephone exchanges.
    Those textphone and international exchange tones give me an eerie
    feeling which I enjoy. I get a feeling of pleasant fear. Its give me a
    psychedelic sensation. I like it. The tones are scary yet fun -- much
    like virtual reality, a roller-coaster, or a trip to outer space!

    If I could find accurate recording of those tones [tones from remote
    Swiss EDTs/EDTNs and international exchange negotiations] on a website
    in Wave format and at least 44.1 kHz sample rate and 16-bit, then I
    would just download those tones and listen. Unfortunately, no internet
    site has recordings of those tones.

    In addition, can EDT/EDTN signals be used as a form of dial-up
    internet access? Obviously it won't be any faster than other dial-ups
    -- most likely a max of 56 kbps. The sounds would be different from
    currently-used dial-up modems, though. This is because EDT/EDTN uses
    different types of signaling than most 56K dial-up modems.

    Also, what does EDTN stand for? From what I was told in
    http://groups.google.com/group/rec....AEARYt3Jalo6NNUi8Jt6wYH6Ba_Ois7NjCgNKwU1jjERM
    , it stands for "European Deaf Telephone Network." This information
    could very well be wrong, given that the poster seems to have a
    personal vendetta against me.

    I googled "European Deaf Telephone Network" in
    http://www.google.com/search?hl=en&q="European+Deaf+Telephone+Network"&btnG=Google+Search
    but only came up with two searches containing my previous posts. This
    is extremely frustrating!!!! I can't believe I am the only one who is
    interested in EDT/EDTN!


    Thanks,

    Radium
     
  2. \Blumstein

    \Blumstein Guest

    Glad you reposted as I'm the new kid in town.

    All of the various teletext protocols are contained in ITU standard V.
    18.
    You can get a free copy at:
    http://www.itu.int/rec/T-REC-V.18-200011-I/en

    Enjoy,
    Paul
     
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