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Old 06-13-2018, 03:17 AM   #1
tauro_kpo
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Question Modem to modem (56k) LAN network


I want to learn how to configure and set up a modern GNU/Linux machine to act as a DSL server, so that I can dial in from an ancient computer that only has a 56k modem, and be able to putty, pscp, to my main computer, and also maybe some basic web-browsing with Dillo too.

My main computer runs Debian 8 and connects directly (ethernet cable) to a modem/router (Internet/WAN). My old laptop runs Win95 RTM and only has a 56k modem.

For the main computer, I have an old USB ADSL Modem:
0572:cb06 Conexant Systems (Rockwell), Inc., StarModem Network Interface
If this modem isn't appropriate for this task, I also have many 56k PCI modems.

The old computer is a Compaq Contura, 4 MB RAM, 486@25MHz.

I need some guidance, what software to use, how to configure it, tutorials, manuals, experiences, etc.

Cheers
 
Old 06-13-2018, 07:31 AM   #2
michaelk
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DSL is not compatible with 56k dialup MODEMS and you will propably discover that the 56k PCI drivers are no longer supported. In addition you would need a real pots phone service or simulator to connect them together.

You could connect the two using a serial which would be the same thing except without the modems. In the old days using a real modem contected to a serial port you would configure it using mgetty.
 
Old 06-13-2018, 01:36 PM   #3
jlinkels
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If your old computer uses a 56k dial-out modem, you need a 56k dial-in modem on your gateway. The gateways is what you call the DSL server. This is modem-to-modem and does not have anything to do with DSL.

What you want is described here: http://kb.unavco.org/kb/article/howt...x-box-268.html
If it does not provide all the information, hopefully it give you a few suggestions for search keys.

Furthermore, you should stick to external modems. Internal modems (PCI or ISA) are a PITA and more often than not are soft modems where the CPU has to perform the DSP function. I doubt if Linux has still some compatible drivers for such cards.

What I miss in this article is how to setup the dial-in modem so it will pick up the line when it rings. You'd need some AT commands to do that. Maybe you can talk to the modem using a terminal program like Minicom and set the correct values. The exist some standard commands, but not all modems adhered to that.

I don't think you are able to show any web page on a browser which can run on a 486@25MHz. Except Lynx.

jlinkels

Last edited by jlinkels; 06-13-2018 at 01:38 PM.
 
Old 06-13-2018, 03:41 PM   #4
jefro
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Not real easy to go from local modem to modem. You'd usually need two phone lines because modem usually needs to think it's on a real phone line.

I think I'd consider using com or parallel port on 95 to access other system.

The last great modem site may have all that information archived. It was the go to site for all info on makes, chips and AT commands.
 
Old 06-13-2018, 08:56 PM   #5
jlinkels
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Quote:
Originally Posted by jefro View Post
Not real easy to go from local modem to modem. You'd usually need two phone lines because modem usually needs to think it's on a real phone line.
In my answer I assumed there was a real phone lines on both sides and a real telephone exchange in between. If that is not the case, modems will not work as Jefro says. You should be able to tie the serial ports together if the computers are next to each other, I just don't know if the mtty can set up a connection without a modem. There will be no dialing etc. Or if you then have to use a simple TTY and make the TCP/IP stack understand it should use TTY as physical layer. As simple as it seems (a modem is nothing more as a device which makes a switched telephone line look like a serial connection) it might be more complicated after all. TCP/IP over serial without modem might last have been used in the previous century.

jlinkels
 
  


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