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From: vernon@hpcvaac.cv.hp.com (Vernon King)
Newsgroups: comp.dcom.modems
Subject: Re: Serial Line Multiplexers (Where can I get one)
Message-ID: <4710008@hpcvaac.cv.hp.com>
Date: 27 Sep 90 14:27:07 GMT
References: <1990Sep26.004728.28349@vlsi-mentor.jpl.nasa.gov>
Organization: Hewlett-Packard Company, Corvallis, Oregon, USA
Lines: 15

What you want is a small data pbx. I have not seen such a creature but I think
one could be made from parts if one had some good technical skills. Below is 
a sequence of events that would do the job. If you added a callback type modem
to the system you would add some security to your system if needed.
1.)modem answers, hitting some key would get mini data pbx attention.
2.)sending another character would select which relay to engage to allow 
connection to appropriate output port on black box. (be sure to surge protect
the switching process, some serial ports do not like knife edge connectors
switching if thats what you use.)
3.)when done with connection send key stroke sequence to disconnect mini pbx
and reset box for next connection.
   
Sounds like a good idea for a product to me. 

                             Vernon