Internet service and power outages?

[Scott Ehrlich]

A thought that recently came to mind (uh, oh!)-

Cable companies use telephone pole-based powerline-powered amplifiers, 
yes?  If so, if power to my area goes out, even if I have a UPS at home, 
all coax-offered services should disappear, correct?

Now, DSL is phone-line offered.   If the central office has its own power 
source, and I have mine, if power did go out, I should still have 
uninterrupted Internet service unless/until my UPS dies.   Yes or no?

Just trying to see how logical and realistic this thought is.

Scott

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