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From: dant@ryptyde.UUCP (Daniel Tracy)
Newsgroups: comp.sys.mac.comm
Subject: Re: line sharing (was: PacerTerm announcement)
Message-ID: <32@ryptyde.UUCP>
Date: 8 Jun 91 10:02:29 GMT
References: <55534@nigel.ee.udel.edu> <11884@hub.ucsb.edu> <27@ryptyde.UUCP> <1991Jun7.045736.8108@PacBell.COM>
Reply-To: dant@ryptyde.UUCP (Daniel Tracy)
Organization: Ryptyde Timesharing
Lines: 22

Responding to the following:

"Not quite true.  Using Data-Over-Voice (DOV) technology you can
run up to 19.2 async or 64kbs sync on top of a voice line.  Most
phone companies (at least the RBOCS) offer (or offered) a central
office based "LAN" using DOVs and (in most cases) AT&Ts DataKit VCS
(Virtual Circuit Switch) although Pacific Bell uses a Gandalf
product.
 
Streching the point further, UNIX Layers and "uw" both offer the
capability to multiplex multiple "logical sessions over a single
line.  And AT&T offers a number of terminals (going back to the
BLIT) that have similar "smart" features (when connected to the
right host)"

But this is still a single "channel". Similarly, with ISDN, you could
communicate via modem and voice at the same time, but both must be at
the same location. Again, only one "channel" is opened. Anyway, it may
be possible and could be happening. I was just giving a generalization.
Someone was excited about PacerTerm because it could carry on multiple
sessions simultaneously, and it sounded like he thought he could call
multiple BBS's with one line/modem.