For the best DSL connection you need the following
1. A DSL modem from Fastcom.
2. ADSL filters on every Telephone device in your home including a possible Alarm system if you have one.
3. the Modem should have a clean run from the Jack to the Bell Canada box in your home.
Option 3 must have and no exceptions: Use only the splitter that comes with the modem plugged into the jack if you need to use that jack with a telephone device.