4 ms·

I was curious about this line in particular. > One of the key aspects of the technology is its ability to adapt to the length and characteristics of the line

• herpderperator 9y ago
  DSL transfers data over specific frequencies. Certain frequencies will resonate better than others over certain lines. Here is an image of a line test conducted for a VDSL2 customer: http://wut.nz/images/spm/1027296.jpg http://wut.nz/images/spm/1027296.jpg. The redder the graph, the faster (up to the maximum VDSL2 speed) the connection is. The vertical line is when the connection spontaneously resynced, and a new speed was attained based on the new conditions of the line. For this particular customer, you can see that tones 410-460 show no transfer at all. This causes a reduction in speed, since those frequencies couldn't be used.
• mordechai9000 9y ago
  https://en.wikipedia.org/wiki/Asymmetric_digital_subscriber_line#Operation https://en.wikipedia.org/wiki/Asymmetric_digital_subscriber_... https://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_correction https://en.wikipedia.org/wiki/Reed%E2%80%93Solomon_error_cor... As I understand it, the endpoints test a range of frequency blocks (or "bins") and only use the ones where there is sufficient signal-to-noise. This is dependent on line conditions.
• outworlder 9y ago
  Heh, "line". That has a very different connotation in this case.