Why is dial up so slow?
Problem
On a dial-up Internet connection, why is the speed is limited to 56 kbits/s compared to a broadband Internet connection which may carry 10 times as much as dial up through that same telephone line? Is it because the dial up is limited to 56 kbits/s by the ISP? Does the ISP amplify the speed when you order broadband?
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1 Fix
Fix for: Why is dial up so slow?
Basically, the telephony line is limited to 64 kbits/s for each channel (8 kHz channel with PCM modulation on 8 bits per Hz, making 8 kHz x 8 bits = 64 kbit/s). Unless you use another modulation(QAM for example) or more bandwidth(more than 8 kHz telephony channel, up to MHz for example), your transmission capacity will be limited to the signal/noise ratio of your telephony channel (low values of S/N will reduce your 64 kbits/s transmission capacity). Let me explain you: According to Shannon–Har…
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