stats look good with good speed. noise margin still a bit high but if you stay connected to test socket that may drop slightly further with another increase in speed. Moving to an extension could set you back a bit from what you have achieved
What does the noise margin tell me about my connection?
Before plugging into an extension, I was going to replace the cover on the master socket and plug it into that. If everything looked ok with that after a week, I was going to move it back to the extension.
In reality if the downstream SNR margin is not seeing target 6db ....
You're losing throughput ... because of levels of impulse noise.
Some lines have a little, some a lot.
If you can cure it ... you score, if not, you get what you get. 😉
The noise margin calculation is not very straightforward.
In very simple terms.
The broadband signal is carried as a number of different "tones". Some of these tones will be unusable because of noise, or a poor line.
The more good tones that are available, the higher the noise margin, so the exchange will try to increase the speed, which uses more good tones, and puts more information on them.
Eventually the noise margin will drop as, usually to about 6db, at which point the speed will be optimum.
If you are getting a high noise margin, low speed, and not too many errors, then the speed will increase over a number of days (weeks).