In addition to the article WestCoaster linked, check the back of the modem. If you are still on copper and not fibre you will see Phone 1 and Phone 2 ports for the incoming DSL connections (phone cords). If you are "bonded" then you will see 2 phone cords connected in the back. Each of those should have a green LED solid right next to them. If only one of them is solid and the other is either constantly flashing or not lit at all then you have a bonded sync problem. Reboot the modem and see if both go solid green. If they do not, contact Telus support as there may be a provisioning issue with your bonded ports or one of them is physically disconnected somewhere along the service path from port to your modem.