Hello @A.AH 

Neither, KPN doesn’t work over Coax cable, that's only usable for a cable internetprovider.

What did you order, DSL or Glasvezel (optic fibre)?

For DSL you should have any of the below connection points, mostly found in the metercupboard of livingroom.

and for Optic fiber one of these:

Which do you have?

Hello @A.AH, KPN doesn't do anything with coax. So i wonder why doe you need the Coax to ehternet cable?