Region : India

Model : TD-W8980

Hardware Version : V1

Firmware Version : 0.9.1 0.12 v002d.0 Build 150514 Rel.33266n

ISP : Bharti Airtel

Model: Archer D7, AC1750 (Couldn't find exact model number in drop down menu)

Problem Statement:
1. ADSL connection fails to get initialized even after 5-10 mins.
2. ADSL connection gets established in subsequent reboots i.e it will connect once after 2-3 reboots

Observations:
1. When ADSL gets connected, the downlink speed detected is 13 Mbps instead OF 19 Mbps
2. When ADSL gets connected, internet browsing just work fine without any disconnections.
3. The ADSL line attenuation is verified by ISP technician and found to be in excellent range.
4. The ADSL configuration as verified by ISP technician is found Ok.
5. My Netgear router works flawlessly with 19Mbps downlink and no issue with ADSL connection initialization whatsoever.

Actions taken:
1. Initially ADSL connection auto-detect was not working during setup. Manual configuration was done and mentioned issue did persist.
2. Router was resetted to factory default settings and firmware was upgraded to 0.9.1 0.12 v002d.0 Build 150514 Rel.33266n which is the latest release as available in tp-link website.
3. Auto-detect function worked fine post firmware upgrade and connection was fine but when connection establishment was tested with couple of reboots, the issue persist.

Conclusions:
1. This is not hardware issue as router has already been replaced.
2. This is not ADSL line issue as it's working fine with other modems and routers.
3. This is not configuration issue because, the connection wouldn't have initialized at all in case of configuration issue. Same configuration works fine with other modem-routers.
4. This is suspected to a software bug in Tp-Link Archer D7.

Please help with you comments to move forward if you have faced similar issue.