Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!clyde.concordia.ca!uunet!mailrus!accuvax.nwu.edu!nucsrl!telecom-request From: lars@salt.acc.com (Lars J Poulsen) Newsgroups: comp.dcom.telecom Subject: Re: Data Over Voice Message-ID: <2037@accuvax.nwu.edu> Date: 11 Dec 89 17:31:03 GMT Sender: news@accuvax.nwu.edu Reply-To: Lars J Poulsen Organization: Advanced Computer Communications, Santa Barbara, California Lines: 42 Approved: Telecom@eecs.nwu.edu X-Submissions-To: telecom@eecs.nwu.edu X-Administrivia-To: telecom-request@eecs.nwu.edu X-Telecom-Digest: Volume 9, Issue 567, message 2 of 6 A little while ago, Richard Steele wrote: > >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_. In response to which Steve Elias speculated that these boxes might be delivering unused bandwidth of a digital subscriber loop for data use. In article <2022@accuvax.nwu.edu> Miguel_Cruz@um.cc.umich.edu writes: >Actually, I'd think it much more likely that there are just extra >pairs running from all the university phone jacks that are activated >on request and connected to the "University computer". >They work at 19200 baud and connect through Secondary Communications >Processors (whatever they are) located in various campus buildings. I >don't even think they're switched by the campus PBX...just wired >straight. The data communication magazines carry ads from several manufacturers of Data Over Voice units. They are carrier-frequency devices that share the local loop to provide a permanent modem circuit on the subscriber pair while allowing normal use of the telephone. The data signal is recovered by a "modem" box (twin to the one on the subscriber end) where the line enters the PBX. I recently learned that our local GTE outfit offers DOV on residential lines. The DOV circuit goes into a CBX (data PBX for asynch traffic) and is delivered to other DOV lines or to dedicated business data liens on the other side. (I wish they had an X.25 option on the other side). Several of the high-tech companies in town have access lines to this switch, as does the university (UCSB). The DOV facility provides 19.200 bps service for about the same cost per month as an extra residential subscriber loop. Unfortunately, my employer is unlikely to replace the current 5 dial-in lines with connections to this service. / Lars Poulsen (800) 222-7308 or (805) 963-9431 ext 358 ACC Customer Service Affiliation stated for identification only My employer probably would not agree if he knew what I said !!