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Thread: Analogue modems

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    Analogue modems

    I have heard that a 56.6K Modem doesn't really work at 56.6K. What I have been told is that the 56.6K rate is in one direction only, the other direction is at 33.3K. Is this correct?

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    Re: Analogue modems

    Hi Andy,
    Yes that is correct. I have a dial-up connection to work with a standard 56k modem on each end and the connection speed is always rated at 33.3k. Even with DSL or ADSL you tend to get a substantially higher download rate than upload rate.
    Regards,
    Rory

    Microsoft MVP - Excel

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    Re: Analogue modems

    Thanks for the confirmation.
    My interest is piqued. Any idea why it should be so technically. I can understand the phone companies wanting to make more money but that isn't a technical reason.

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    Re: Analogue modems

    The 56K relies on the ability to deliver a digital signal directly into the digital part of the telephone exchange, this requires the ISPs modems to be colocated with the phone company. You can't do that for your modem at home.

    StuartR

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    Re: Analogue modems

    AFAIK, it's a limitation of the V.90 modem standard (V.92 theoretically allows uploads up to 48k). I seem to recall reading somewhere that this was because they were rushing to get V.90 approved so they used the same uplink modulation as was in the V.34 standard, which was limited to 33k. I could be wrong though! <img src=/S/grin.gif border=0 alt=grin width=15 height=15>
    Regards,
    Rory

    Microsoft MVP - Excel

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    Re: Analogue modems

    So that is why there isn't this restriction with the digital ISDN lines.

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    Re: Analogue modems

    Rushing to get a product on the market. Hmm. Sounds familiar.

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    Re: Analogue modems

    Rory,
    Before I was able to get DSL, I was very interested in the Zoom modem that had come out with V.92. I contacted Zoom's product manager to try to get one of the first v.92's as they came out. However, he then advised that V.92 wasn't any advantage UNTIL the ISP's upgraded their equipment to be compatible with the new standard. So far as I know, that never happened with any of the ISP's, so the apparent good feature of V.92 went down the tubes. Now with DSL, it doesn't make any difference to me, but it could be a big advantage to others who can't get DSL or cable yet.
    Seems like the ISP's are holding on to their cash and avoiding any capital outlay at this time. Shame because it's one of the things we need to break us out of this economic "blue funk" we all are in.

    Bob
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