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If the link light is off then there is no connection between gateway and Node. Check connection from DSL port on Gateway and phone wall socket. Its best to connect DSL port on Gateway directly to wall socket without using a ADSL filter / splitter. If you have several phone sockets try another socket. If several phone sockets make sure nothing is plugged into any of the other phone sockets.
Try doing a factory reset on gateway. There is a pin hole just below power button. Press button inside pin hole for about 10 seconds using bent paper clip. Gateway should reboot.
If you link light still off ring support 1800834273