On 2015-07-30, micky wrote:
In alt.home.repair, on Thu, 30 Jul 2015 09:15:29 -0700 (PDT), Uncle
Monster wrote:

I have see DSL work when there is no dial tone because the high frequencies that carry the DSL signal were jumping the tiny break in the wire as though it was a capacitor. ^_^

Aha. I can understand that.

Yep. Makes sense and I suspected as much. TIG welders also use a
high freq signal to initiate a lower freq spark across a gap.

nb