QUOTE(xianzzz @ Apr 11 2017, 04:35 AM)
SNR Margin:18.0 21.0 db
Line Attenuation :24.0 24.5 db
Data Rate :5120 512 kbps
Max Rate :8928 1168 kbps
Modulation: G.DMT
Annex Mode:ANNEX_A
SNR Margin:17.4 25.5 db
Line Attenuation:40.5 24.4 db
Data Rate:5120 509 kbps
Max Rate: 11936 1164 kbps
Annex Mode:ANNEX_A
Modulation: ADSL2 PLUS
Is my line quality possible to get 8mbps? If not any method able to improve the quality? Renew the telephone cable inside the wall?
The Modulation before I used is ADSL2+, but ping 50++. After changed to G.DMT 20++. Why like this?
I was planning to reply you few days ago, but I got suspended for a weird reason

......so......here we go.
Yes, it is possible for you to get 8Mbps....At the cost of higher latency.
The ping time is high due to interleaving.
Please have a look on my posts at this page
https://forum.lowyat.net/topic/3343344/+3640 , yeah, just that whole page. From top to bottom.
Read my posts at that thread first before continue.
When you changed dsl modulation to G.DMT, the interleaver depth is 32 (downstream) and 8 (upstream).
Default ADSL2+ modulation has interleaver depth of 64 and 8 respectively.
In your case though, you cannot change to FastPath. You are stuck with Interleaving mode. Your dsl signal attenuation is just too horrible.
If you insist to changing it to fastpath, you will get dropped network packet and random dsl desynchronization.