Help identify wiring adapter involving Cat 5e cable?
This was your original BELL system wiring throughout your house. It would have been modified throughout the years as bell added new cable for the old DSL service. You can see the old service drop coming in from the top and the distribution phone lines branching out from there. Who are you with now? If you're not using any of that wiring for your existing service, you can use it for whatever you need.  I know this is vague but so is the picture.