There are few things needed to check,
1. Make sure the connector and cables are well plugged
2. Check the ADSL LED of CPE, it should be blinking (meaning it does try to establish a connection.)
3. Check the ADSL line code setting. The default is AUTO, it will detect the ADSL line code, G.dmt, G.lite, and T1.413 automatically. But in some area, it can not detect the ADSL line code well. At this time, please adjust the ADSL line code to G.dmt or G.dmt_auto first. If it still fails, please try the other values such as Alcatel...
4. If you have done above methods, please contact our support department for help.