Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!accuvax.nwu.edu!nucsrl!telecom-request
From: steele@ee.ecn.purdue.edu (Richard Steele)
Newsgroups: comp.dcom.telecom
Subject: Data Over Voice
Message-ID: <1978@accuvax.nwu.edu>
Date: 8 Dec 89 06:58:58 GMT
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Reply-To: Richard Steele <steele@en.ecn.purdue.edu>
Organization: Purdue University Engineering Computer Network
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X-Telecom-Digest: Volume 9, Issue 561, message 5 of 5


Here at Purdue U., we now have access to something called data over
voice (DOV) units.  These are small boxes, about the size of a regular
modem, that gives the user a 9600 bps asynchronous data line to the
University computer.  Not only is the bugger faster than a modem, _but
it leaves the phone free for regular use_.  We can still receive and
make calls with the DOV working with no obvious distortion on the
line.  Thus, in addition to having a reasonably fast connection (and I
used to think a 2400 baud modem was speedy!), I don't have to take the
wrath of my roomates for hogging the phone line all night long.

The DOV unit connects to the phone line before any other equipment;
i.e. there's are line in and line out jacks.  In addition, just like a
Hayes Smartmodem, there are a plethora of LEDs on the front like CD
(carrier detect), RD (receive data), SD (send data), etc.

Question: How would something like this work?  The phone company
_does_ need to make some changes on their end, but the phone line
remains the same.

So, what magic is involved here?  Thanks to all who respond...

Richard A. Steele                                       Purdue University