I am going to install a master filter on our new vdsl in our new to us house (1990). Here is a photo of a box on the incoming line in the basement. I intend to put the filter here and run a ne wline a few metres to where I want the modem in the weekend. Just now I had a quick look at the wires and there is two pairs of wires. I thought maybe one pair was not needed but if I disconnect either pair I get no dial tone. So now I need advice on which wires I will be connecting to the input of the master filter? I can't quite remember what I did in our last house which I think was similar. Thanks for any advice.