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From: cuccia@MONET.BERKELEY.EDU (Nick Cuccia)
Newsgroups: comp.dcom.telecom
Subject: TTY/TDDs and Baudot
Message-ID: <21254@ucbvax.BERKELEY.EDU>
Date: Tue, 13-Oct-87 01:13:50 EDT
Article-I.D.: ucbvax.21254
Posted: Tue Oct 13 01:13:50 1987
Date-Received: Sat, 17-Oct-87 16:33:44 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: monet.Berkeley.EDU!cuccia@ucbvax.Berkeley.EDU (Nick Cuccia)
Organization: University of California, Berkeley
Lines: 23
Approved: telecom@xx.lcs.mit.edu


Hello,

I have access to a TDD that my SO uses to call her deaf grandmother
in Connecticut.  I'm curious about how it works, but the manual that
came with it tells me nothing.  Therefore, I pose the following questions:

	(1) What form of Baudot does it use, and what five-bit codes
	    correspond to what characters/figures?  

	(2) What method is used for communication?  Is it a form of
	    Frequency-Shift Keying, and if so, what are the frequencies
	    used?

	(3) What data transfer rate is used, and what are corresponding
	    bit lengths?  

I would appreciate any answer, either directly concerning the above questions,
or that point to references that deal with TTY/TDD communication.

Thanks in advance,
--Nick Cuccia
--cuccia@ucbarpa.berkeley.edu