ISDN uses a two-wire telephone line.
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Line graphs can also be used to compare changes over the same period of time for more than one group. Pie charts are best to use when you are trying to compare parts of a whole. They do not show changes over time. Bar graphs are used to compare things between different groups or to track changes over time.
I would say that morse code would be the answer, but im not sure if that would apply to computers
