But as something of an idle (it is after all actually running) and probably obvious query, what is the difference between "DSL" and "Internet"?

The router has a variety of LEDs on it, including one labelled DSL and one labelled Internet. I had always assumed that Internet was a subset of DSL (i.e. DSL means you're connected to the exchange, Internet means you're actually sending/receiving data).

However, looking at the router's own stats (i.e. logging into it with a browser), it displays a significantly higher data transfer for "Internet" than "DSL":

[And here I was intending to insert a screen capture of the d@mn statistics, but cannot figure out how to do this... not a good sign.]

In any event, be assured that I have readouts for both DSL and Internet, both have a "data transferred" figure, and the Internet figure is much higher than the DSL figure, and yes I've checked that they are measured in the same units etc. etc.

Any enlightenment appreciated.