Path: utzoo!censor!geac!torsqnt!hybrid!scifi!bywater!uunet!hayes!tnixon
From: tnixon@hayes.uucp
Newsgroups: comp.dcom.modems
Subject: Re: Conferencing modems
Message-ID: <3729.27910682@hayes.uucp>
Date: 14 Jan 91 01:16:49 GMT
References: <1991Jan12.055735.18719@beach.csulb.edu>
Organization: Hayes Microcomputer Products, Norcross, GA
Lines: 20

In article <1991Jan12.055735.18719@beach.csulb.edu>,
sichermn@beach.csulb.edu (Jeff Sicherman) writes: 

>   Protocols and other software issues aside, is it possible or practical
> to have a conference call with modems ? No real need or application but
> interested in the electronic and telephony issues.

It's not possible to have a conference call with the modems that are 
typically used with PCs.  They all use modulation schemes that 
transmit a continuous carrier, and these could conflict with each 
other.  The way to do a "conference call" with modems is the way it 
is done on CompuServe and many multi-line BBSes -- the modems don't 
share a phone line, but the host software takes anything typed on 
one line and duplicates it out to the users on the other lines.

-- 
Toby Nixon, Principal Engineer    | Voice   +1-404-449-8791  Telex 151243420
Hayes Microcomputer Products Inc. | Fax     +1-404-447-0178  CIS   70271,404
P.O. Box 105203                   | UUCP uunet!hayes!tnixon  AT&T    !tnixon
Atlanta, Georgia  30348  USA      | Internet       hayes!tnixon@uunet.uu.net