
How fast can a traditional modem that works with a telephone line transmit data?
Computer assignment question
Maximum for modem to modem on analog phone lines is 33 kilobits per second. To an ISP that is digitally connected to a phone company the maximum for 56k is 53 kilobits per second download (due to current power limitations on phone lines) and 33 kilobits per second upload.
But that can decrease based on wiring distance and quality to phone company, or increase using data compression. Theoretically if CPU to modem speed is 115k, compression could increase transfer rate 2 to 4 times. But that depends upon how much uncompressed data can be compressed (repeating patterns in text or other data) or whether it is already compressed as much as it can be (zip or jpg files).
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Computer Basics : How Does a Computer Modem Work?
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