Analog modem emulator?
doc at mdrconsult.com
Tue Aug 2 10:00:59 CDT 2005
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.
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