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Given that the bandwidth of a voice grade telephone line is usually limited to about 4KHz how is it possible to provide high speed internet

Given that the bandwidth of a voice grade telephone line is usually limited to about 4KHz how is it possible to provide high speed internet access over normal telephone lines? Provide details on a suitable encoding scheme that could be used to provide such a service e.g. ADSL using DMT (Discrete Multi-Tone) modulation.

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