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  • #2082639

    Modem Throughput

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    by raatkins ·

    Has anyone ever seen or done a comparison between ISA and PCI bus modems? Specifically USR sportsters. Assume all updated drivers and firmware, v.90, typical connection 52k.
    thanks for your input.

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    • #3892139

      Modem Throughput

      by veeray ·

      In reply to Modem Throughput

      I get many variations on this question, almost daily. The answer is related to many factors, PCI bus speed, CPU speed, Hardware and Phone Lines. The Throughput shouldn’t be affected by all of these, but experience has shown me that it is. A new system with a 133 bus and high speed CPU will use a PCI modem to gain the fastest throughput, always assuming there is a path for the data, (connection speed) An Isa modem will sometimes outperform a PCI if the system is slower and older, not to mention if the PCI bus speed is slower.
      The final analysis relates to the actual modem, no two modems perform exactly the same way in the same conditions. A current example would be the infamous Athena modem, by Conexant (Rockwell chipset) Three of these in the same system on the same phone line with the same drivers ect., will perform with wildly different attributes, one may not connect at all, another may constantly lose configuration, and the third will consistantly connect at 50k and remain sofor days. As a resul

    • #3891977

      Modem Throughput

      by kyle ·

      In reply to Modem Throughput

      Well….Like the first response stated, there are alot of variables in the throughput benchmark. Are you reffering to internal throughput from the modem to the bus or from the net to the modem? Ill assume you mean net to modem. In that case your MAIN drawback is your phone lines. Any ISP tech knows how big of a role lines play in the internet game. While bus and processor speed and so on affect the throughput from card to bus and so on….
      they do not affect net to card. So there are two levels of throughput to measure. ISA and PCI are very different in the internal level of throughput. But as far as Kbps….they are irrelevant.

    • #3895324

      Modem Throughput

      by tchieng ·

      In reply to Modem Throughput

      If you’re talking about speed, there is no difference between an ISA and PCI model. The answers above are correct. Your connection speed is dependant on line quality as well as the quality of the modems on both ends. So you think you’re connected at52kb? Point your browser to the URL below to get an reasonably accurate through put test. You’ll probably find that its effective through put is only in the 35kb range.

      http://www.computingcentral.msn.com/topics/bandwidth/speedtest50.asp

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