Analog modem emulator?

[Doc Shipley]

Jochen Kunz wrote:
> On Mon, 1 Aug 2005 23:02:33 -0400
> "Pete Bartusek" <pete at bartusek.com> wrote:
> 
> 
>>Essentially the layout would be this.  I have a computer with 4
>>internal modems in it. Has to be internal, I can't do this with
>>external modems/serial ports.  Somehow I get it configured so that I
>>can telnet from the internet to this "emulator" and it directs my
>>telnet session to one of the 4 free analog lines.
> 
> Get a terminal server with "reverse telnet" capability, connect modems
> to the serial lines, connect the modems back-to-back to the POTS lines
> of the internal modem and that's it. OK, most likely you have to do some
> tricks to get a ring signal when someone connects via telnet to the
> terminal server. E.g. it may be enough to use DTR from the treminal
> server to initiate a ring tone generator on the POTS line between the
> modems. Or get a old == cheap small analog PBX...

   I'm certain that I've done this by connecting 2 modems back-to-back, 
although it's been a very long time.

   There's an AT command to open the line without a ring signal.

   A Livingston Portmaster 2 or 2E is nice makes very nice terminal or 
console servers, have dial-in/dial-out capability, are well-documented, 
and very cheap.  They're also a lot more common than the various DECservers.

   As a matter of fact, I have a 10-port 2E and a 20-port 2E for sale. 
Make a silly offer.


	Doc