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What does a good DSL waveform (signal) look like?

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Not sure you will see anything useful with just a scope. put a generator at 276k and watch for noise using a scope might work.

Better to use a simple cat5/phone line scanner the installers check lines with.

One thing to note is SHDSL cannot be used on a line with a phone splitter/microfilter.

Noise is usually not a problem in twisted pair systems. Induced current on the line is canceled by the opposite current on the pair line.

Because its a two pair system you can improve error tolerance by dropping data rate.