When my PS2 is connected to the TV, without the ethernet jack, all is good. When I plug in the ethernet cable, which is routed through the walls where it connects to a Cisco Catalyst 2900 series switch in another room, the TV gets small "moving bands" on the screen.. The tint of the picture changes slightly too..

Using Component video cables.

What can cause that? I don't see how ETHERNET affects video out.