Maximum bandwith capacity on CABLE and ADSL

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Bandwidth
Hi forum. Iam in the uk and in terms of broadband services we have here the cable and adsl service network Is there a maximum bandwith capacity ever available on both these networks? For example is it analogous to the capacity of processors which generally double in speed every 12-18 months (Moores law) If the speed of cable and adsl does continously increase, then how is this so? because for example with processor technology its the increase in the number of transistirs on a chip whic increases the processor power and speed. Regards

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The limits on broadband connectivity are much more constrained than CPU speeds. For example, you won’t be seeing any increases in the speed of analog modems. They have reached the theoretical limit of the physical medium. Part of the reason Moore’s law works is because they are replacing everything that limits the speed with each generation.
For DSL the limits are constrained by the quality of medium and length.
For cable, the issue is how much of the bandwidth are they willing to devote to data, (as opposed to TV channels), and how many users are on the same cable.
If the providers invest in a new medium like optical fiber to the home then you will see a massive increase in bandwidth. Given the costs of replacing the existing infrastructure, I expect this to be gradual.
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