Hi again @tiffy, don't suppose I can do anything on the upstream to get the SNRM to drop there can I?
Purely from long term observation and stats recording of my line and the 2 family VDSL FTTC lines I monitor, don't think there is much you can do to encourage DLM to increase your US synch speed provided there are not excessive error rates present.
Have never seen US BRAS IP profile indicate anything other than max contractual speed on the 3 lines I monitor.
Have seen US G.Inp very infrequently applied to all 3 lines, in all cases appeared to be as a result of substantial and prolonged increase of US ES rates which the US G.Inp application of course immediately mitigated resulting in US G.Inp removal again by DLM usually within 2 to 3 days.
In all cases, the US "noise " source had by that time abated and US G.Inp remained off.
If the US noise had continued I would imagine the cycle would have continued as US G.Inp is not applied by DLM by default.
No idea if there is a high/low US G.Inp profile as such as the US BRAS profile never seems to change from max contractual speed.
My line has always DS synch'ed at max rate achievable on the rather long (26.6 dB DS attenuation) line with a very low ES rate, in my case approx 5.40 Mbps on 40/10 provision.
Probably not directly relevant to your situation but you may find of interest.
I had a line issue in April which only effected my US synch speed, the rather long and detailed saga is here:
https://forum.kitz.co.uk/index.php/topic,24606.msg413899.html#msg413899Does indicate how line noise can effect particular areas of the band spectrum and not others.
The issue was resolved no thanks to my ISP and thankfully has never returned to date.
Alex Atkin UK has already commented on DLM US SNRM philosophy.