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Since we were connected to the NBN on 11 July the Maximum Line Rate has decreased from 39.3 Up/90.22 Down to 38.8 Up/79.9 Down.
Actual Line Rate is yet to be affected but if this trend continues we're worried that will be decreased as well.
Full stats originally were;
DSL Status Up DSL Uptime 35 minutes 33 seconds DSL Type VDSL2 DSL Mode Fast Maximum Line rate 39.3 Mbps 90.22 Mbps Line Rate 20 Mbps 54.99 Mbps Data Transferred 13.15 MBytes 103.92 MBytes Output Power 6.1 dBm 14.4 dBm Line Attenuation 5.5, 23.4, 36.9 dB 12.1, 30.2, 47.3 dB Noise Margin 18.2 dB 16.1 dB
Stats now are;
DSL Status Up DSL Uptime 1 day 1 hour 23 minutes 13 seconds DSL Type VDSL2 DSL Mode Fast Maximum Line rate 38.86 Mbps 79.98 Mbps Line Rate 20 Mbps 54.99 Mbps Data Transferred 1272.17 MBytes 10032.47 MBytes Output Power 6.3 dBm 14.5 dBm Line Attenuation 5.7, 23.6, 37.1 dB 12.4, 30.4, 47.6 dB Noise Margin 18.1 dB 13 dB
The download noise margin has decreased which is why the difference between download maximum speed and actual download line rate has decreased. This might be due crosstalk from one of your neighbours connections who might have just recently been connected and has a faulty connection.
Unless it is causing other problems such as loss of internet there is nothing you can do. If the line rate does fall below 50/20 you could report a fault. It is unlikely that the maximum and actual line rate will decrease to this level.