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<latemp_subject "Adding Modio Support for TTYs of deaf people" />

<p>
This page describes a student's project to add support for deaf people
TTYs into Smart-Link's <a href="http://www.smlink.com/">Modio</a> 
software-based modem.
</p>

<p>
Deaf TTYs speak between themselves in a protocol called V. 18, whose 
documentation can be ordered from the <a href="http://www.itu.int/">ITU</a>. 
V. 18 lies directly above the phone line and doesn't use V. 8 or V. 21 to 
speak with other V. 18 devices. Furthermore, the TTYs understand a character 
set called Weitbrecht/Baudot, which is different from ASCII and whose 
<a href="baudot.txt">documentationcan be found here</a>.
</p>

<p>
So, what a student who wishes to implement this needs to code is:
</p>

<ol>
<li>
A module to read waveform data from the sound card and convert it into Baudot
</li>
<li>
A module to convert from Baudot (plus shift codes) into ASCII.
</li>
<li>
A module to convert from ASCII into Baudot (with shift codes and perhaps also 
line breaks after 72 characters in each line)
</li>
<li>
Module to convert from the Baudot into waveforms.
</li>
</ol>

<p>
Those modules can be implemented using a Modio Soundcard/Modem, and basic
drivers to read waveforms from the telephone line that will be supplied by
Smart-Link.  They will be written in Windows-95/98 or Windows NT using VtoolsD
or VdWorks.
</p>

<p>
TTYs or TTY-compatible modems will be required to test the drivers against.
It is possible that the Association of the Deaf in Israel will be able to
supply the student with TTYs. Otherwise, TTY-compatible modems can be bought
from NXi Corp.
</p>

<h2>Other Important Links</h2>

<ul>
<li>
<a href="http://www.smlink.com/">Modio's Homepage</a>
</li>
<li>
<a href="http://www.weizmann.ac.il/deaf-info/tty_faq.html">Omer Zak's FAQ regarding communication with Deaf TTYs</a>
</li>
<li>
<a href="mailto:shlomif@iglu.org.il">Shlomi Fish's E-mail</a> (for questions regarding this project)
</li>
<li>
<a href="http://www.nxicom.com/">NXi Corp.</a> - They manufacture modems that can talk with TTYs
</li>
</ul>