On Thu, 2007-08-16 at 11:10 -0500, Mark E. Skeels wrote:
> Here's another question:
> 
> Does a DSL modem take the phone line "off hook?" (I doubt it..)

Nope, it has no mechanism to take a phone line "off hook".

> Or does it simply communicate over the phone line, at high frequency, 
> with no regard for hook status or dial tone?

It works exclusively outside of the voice band. Think of it like two
radio stations on different channels, they have no relation to each
other. TTYL

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