Question: Internet access over telephone lines has been driven by your desire for higher speed. Given the following fact: voice bandwidth: 3,000 Hz; signal-to-noise ratio

  1. Internet access over telephone lines has been driven by your desire for higher speed. Given the following fact: voice bandwidth: 3,000 Hz; signal-to-noise ratio between two phone sets: 30 dB; modem sampling rate: 2,400 baud, please explain concisely:
  1. how your old modem was improved from 2.4 to 9.6 and 28.8 Kbps (i.e., kilobit-per-second) in speed; [0.5]
  1. why such improvement stopped around 33.6 Kbps; [0.5]
  1. how 56 Kbps is achieved otherwise; [0.5]
  1. how your DSL modem now can achieve an even higher speed. [0.5]

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