Home Guy wrote:

The demarc might look like one of these:

http://upload.wikimedia.org/wikipedi...px-Demarc2.JPG
http://www.maximumpc.com/files/u1124...rc_before2.jpg
http://flylib.com/books/2/545/1/html...ges/f27-11.jpg


My NID looks like this:
http://en.wikipedia.org/wiki/Network_interface_device (the first picture)
and is on the outside of my house.

From there, the wires do come into the house and go to something that looks
like this:
http://upload.wikimedia.org/wikipedi...px-Demarc2.JPG
which is what you posted and I guess is called a demarc.

When I go to the outside of my house and open up the owner side of the NID,
and then unplug anything that is plugged into the owner side, everything
from the inside of my house is isolated from the incoming phone lines
(unless someone miswired the NID and accessed the phone company side of the
NID).