using sig generator and scope as TDR for troubleshooting ethernet
It's unlikely that you'll have much success with TDR, which stands for "time-domain reflectometry", with such limited equipment. In order to get usable resolution, TDR requires very fast signal edges (nanosecond rise/fall times) and wide-bandwidth analysis equipment.

But if you understand the theory, there's an equivalent frequency-domain analysis that you can do with more modest equipment. You'll still need a signal generator, though &mdash; preferably one with very accurate frequency settings. I would suggest getting one of those DDS signal generator modules that are available at modest cost all over the Web.