I´ve heard that DSL is a dedicated line and cable is a shared line, what about that?
That is partially true. Cable lines are shared within a neighborhood and if a number of subscribers in the same neighborhood all ask to download files at the same time, performance will be slowed. What the DSL folks are not telling you is that while DSL subscribers do not share the line in their neighborhood, they do share the link between their own central office and the network backbone, so the bottleneck still occurs during peak usage – it just occurs in a different place in the network. Also, DSL slows down the further you get from their central office.
