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DSL Bit Loading
The frequency bandwidth of the link is is divided into tones of 4.3125 Khz bandwidth.
The tones are displayed along the horizontal axis.
Each tone can carry up to 56kbps of data.
On a perfect line each tone would carry 56kbps of data at lower frequencies. As the frequency increases
the number of bits per second will gradually decrease.
If there is noise on the line at a particular frequency the bits per tone will be less at that frequency as
indicated in image below.
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