Today I am going to present an interesting device from the company Multitech. I will be making use of a document written by my colleague Jesús Santos, whom I thank. I will be talking about the MultiConnect AW MT200A2W.

Very good. What is it?

Well, imagine you have a device that uses an analog modem to communicate (one external or internal inside the device itself) or simply imagine that you have a switchboard or a traditional fax machine where data is managed (not voice data).

Now imagine that you want to install this device and for whatever reason but it turns out that you don’t have a free telephone line to connect to or simply imagine that you don’t want to use a new analog line or that the telephone cable installation could be expensive.

For that you need this device. It’s an analog line emulator for GSM (for data). This means that instead of plugging the analog modem into the conventional telephone socket, you can connect it to this Multitech device’s RJ11 opening. Thanks to its internal SLIC (that we’ve already talked about), it’s a module that emulates a telephone line.

How easy! Does that mean that the MT200A2W collects data from the SLIC coming from my analog modem and it sends the data directly through its internal GSM modem?

No, you are missing something. The MT200A2W also has an internal analog modem socket that communicates with your analog modem through SLIC. Therefore sending analog signals directly via GSM through the audio channel wouldn’t work due to the damage that these signals would suffer in the GSM network. Then the data is routed through the internal GSM modem in the Multitech device.

This means [your analog modem] — [SLIC--- analog modem socket --- microprocessor --- GSM modem]


Can I not do this with the classic FCT, wireless local loop or gateway that my GSM operator gives me?

No, it won’t work. The devices that you are talking about are designed to connect to analog telephones and to route calls when we phone a mobile telephone, but only to route VOICE calls, not DATA calls. Data calls will NOT work properly with a FCT.

That’s interesting. I understand that you’re talking about the MT200A2W but I see that in reality that there are various models.

Yes, there are two. The MT200A2W, a device designed more for indoor use which has plastic housing and is nicer aesthetically. On the other hand we have the MT100A2W which has aluminium housing, a voltage range, extended temperature range, RS232 port etc. This means it’s more industrial. An important thing to consider when choosing the model is that the MT200A2W model is only able to make calls (calls made by your analog modems) and the MT100A2W is able to both make and receive data calls.

Well that’s all for today. I hope you all had a good holiday. As for me, I had a great 3 weeks holiday. I spent most of the time in Huesca, a great place to relax, to do adventure sports, to eat well as well as always having nice people everywhere. In short, my family and I had a lovely holiday.

Best wishes. ;)



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5 Responses to “How to route an analog modem through a GSM line”
  1. fjcanellas says:

    Hola Jose,

    Creo que este equipo me puede resultar interesante.
    La única duda que tengo es que mi aplicación es bastante antigua y en MS-DOS.
    Tendré que probarlo.


    • blogElectronica says:

      Hola Javi,

      si lo necesitas probar, ya sabes, el tío Jesús puede prestarte uno :)
      Por cierto, ya me han contado que has tenido buenas noticias últimamente. Enhorabuena!


  2. fjcanellas says:

    Gracias Jose. Pues algo mejor aún. Voy a intentar comprar uno.

  3. TSPS says:

    ¿Para usarlo se necesita dar de alta algo adicional en la línea GSM de voz normal?

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