1. Yes i do have filters on. There is 2 jacks which are used. In the downstairs jack the phone line is plugged with the filter and upstairs adsl modem is plugged with the filter
2. I dont think there is master filter
3. there is no jack labelled dsl. the connections are in every room to plug in the phone line. So in the downstairs room i plugged in the phone and in the upstairs room i plugged in the internet with filters on both of them. In the filters where it says phone line i plugged in the phone and where it says adsl internet i plugged in the internet.
4. i have no idea how many jacks there are in the house but atleast 5 are there that i can remember so it will def be more than 5
5. The house is nearly 9-10 months old