Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: "Joseph C. Pistritto" Newsgroups: comp.dcom.telecom Subject: TDD's and Faster Speeds Message-ID: <8454@accuvax.nwu.edu> Date: 31 May 90 05:13:36 GMT Sender: news@accuvax.nwu.edu Organization: TELECOM Digest Lines: 20 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 10, Issue 399, Message 6 of 9 A significant problem for upgrading TDD's is the installed base. I bet there's a lot of these out there, so any new device would have to speak 45 baud as well as 300 or 1200 or 2400 or whatever. Now actually, this is more of a problem than you think. Most baud rate generator/modem chips don't support baud rates below 110 any more, and if they do the only choice is usually 75, (used for lots of newswire services, maybe even still for Telex). Also, this is a 5 bit code if I remember correctly, and lots of chips don't support 5 bits any more either. This would probably complicate the design by several more chips than would otherwise be needed, raising the price. I don't know what the average income level of a deaf person is, but I bet it would take a while for this idea to gain acceptance. Although I'd think the the ability to use online services like Compuserve and BIX would be work something to at least a reasonable number. Joseph C. Pistritto (cgch!bpistr@chx400.switch.ch, jcp@brl.mil) Ciba Geigy AG, R1241.1.01, Postfach CH4002, Basel, Switzerland Tel: +41 61 697 6155 (work) +41 61 692 1728 (home) GMT+2hrs!