Model : TD-W8970

Hardware Version :

Firmware Version : V3

ISP :

I have D-Link router (From internet supplier 012) - It is working perfect and I have ~80MB speed.
When I connect the cable to the TP-Link TD-W8970 and follow the quick setup, the DSL light keep flashing and turning off and flashing...
I contact the Internet Supplier (012) and they checked everything, at the end of the day, they said it is router issue.
PLEASE HELP ME
Thanks.
Ahmad.