New subject: Minimum requirements for receiving 56K modem connections

1 Jul 2024

      First the i-modem is a digital ISDN modem. It can not talk to a analog modem, There is a way to make 2 ISDN devices talk without an active line like you did with the analog modems, I did it in my Cisco CCNA class but don't remember how we did it.

The analog phone line modems can be used the way you did by connecting them together with a phone line and dialing with the ignore ring tone on one modem and ATA on the other modem. As far as I know there is no middle equipment needed for an analog modem connection. I do remember the newest analog 56k modems had stupid drivers and were soft win modems as in no firmware on the modem, it was loaded by the driver and only worked with windows.

I think you have to tell the modems to actually do 56k not just dial and ATA. or you might just need to reset the settings on the modem, it might be set to 36k. Also, if it's an external 56k modem you need to adjust your serial speed on the serial port. This is the speed the port talks to the modem and the modem talks to the port. This is separate from the speeds the 2 modems are set at to talk to each other!

Thanks,

David Eugene Waybright
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________________________________
Message: 1
Date: Sun, 30 Jun 2024 15:00:34 -0400
From: John Heritage <john.heritage@gmail.com>
To: vcf-midatlantic <vcf-midatlantic@lists.vcfed.org>
Subject: [vcf-midatlantic] Minimum requirements for receiving 56K
        modem connections
Message-ID:
        <CAF5f3Ugj-71Uh153yDyj7amvPVsS0wH186DykcRsQz-ZYyiOfg@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"

Hi folks!

I'm messing around with a bunch of modems at home, and would like to know
what's required to set up one system to receive 56K calls from another
system.

I'm able to get 33.6kbps bi-directionally (or 31.2K) with just a phone line
between the two modems, and using ATX1D and ATA commands.

I think to get 56K I require some equipment to simulate a digital
connection, and I'm also not sure if a 56K analog modem can even receive
56K calls.  Is this true?

Modems I have on hand:
- a USRobotics Courier I-Modem
- 2 x USRobotics V.Everything, and a USRobotics 56K/X2 Sportster external
modem

I am also unable to get the I-Modem to connect to any of the analog modems,
and although it does have the protocols to support analog, it seems like
it's expecting a BRI / ISDN connection to allow that connection.   Is this
true?

If the above are true - what's the minimum / cheapest solution for being
able to at least establish a V.90 connection given the equipment I have
already?

Thanks for your help!
John

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Re: [vcf-midatlantic] Minimum requirements for receiving 56K modem connections

David Waybright

David Waybright

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