🚀 go-pugleaf

Thanks to everyone who responded to my question about crest factors; the
subject, though now I see a rather simple one in concept, has been bothering
me for a while.  Now, for another one:

Here at Pudue 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.

Question:  How would something like this work?  The phone company _does_
need to make some changes to their central switch (or something like
that -- although I'm a EE, telephony is definately _not_ my specialty. :-) )

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

Richard A. Steele                                            Purdue University