For a while I couldn't figure out where the vibration noise was coming
from. In the attic? A mouse maybe? I searched and searched for a source
but could never really pinpoint it. Until one day, months later I was
standing outside my house.
I heard it clear as day and I was standing very near to the little black
box that the phone line comes into from the street. Short bursts of
vibrations coming from the telephone line lasting 1 to 2 seconds. It's
happening all the time.
What is this? It's been going on for years. And is it normal?