@Kevin_Z why so? my internet is working well and the line performance is also excellent.

System Log 1/1/2000 0:0:52> PAP Authentication Successful 1/1/2000 0:0:52> ppp_ready: ch:804e5094, iface:8040e98c 1/1/2000 0:0:52> PPP get IP Address:10.251.31.51 1/1/2000 0:0:52> PPP...

Do you think this is the right answer?

There is really nothing wrong with both modems , they are both obtaiing the near same sync rate. The only marked differences you have got is the differece in line attenuation and snr margins and this...

Tplink 8951nd. Modulation ADSL2 PLUS. Annex Mode Annex_A Downstream Upstream Snr margin 16.4 11.2 Line Attenu 18.9 11.5 Data rate 12000 1021 Max rate 18988 1191 Crc 0 0 Tplink Archer vr600 eu v2...

Do you advise to return and check 4 times?