Suddenly get a high SNR margin / Attenuation ?

My SNR Margin around 11dB-20dB

Attenuation around 40dB-50dB

Speed test that time, ping around 15 - 18 ms, but speed stuck at (+-) 2mb. But in the end of test, will boost to 4mb. No idea why?

I using 4mb line, but daily use almost few hour dc awhile. The copper line from pillar is already dark color. If I want to replace it, I should call tm or find 3rd party to re wire for me?

I when to tm request upgrade that time, they still need send technician to come over check my SNR Margin / Attenuation before they let you apply the 4mb package.

Technician show me the value and briefly explain to me. But he test the speed at tm speedometer website. Never show ping.

Any different between 175 and 218 ? Look the same to me.