>> going back to the value of 6 db for SNRM
6dB is the common figure used to set
Target SNRm for adsl.
As roseway says you would normally expect to see this figure fluctuate over time....
... but it is possible that you have a very steady line, for example I used to sit on an unwavering 3dB upstream SNRm (target SNRm was also 3dB) for months on end at the maximum configured upstream speed for an annex_m connection.
So having personally experienced this phenomenon for years, I don't think its too unusual to see a rock steady SNRm in line with the Target SNRm,
if the connection is achieving a maximum configured upstream figure set by the DSLAM/MSAN.
That line isnt running at full power (9.8, 11.6, 9.7), so it actually has more to give than what the router is reporting if it was on adsl2+ and it appears to be currently restrained by limitations set on the DSLAM and/or G.DMT technology.
Seeing G.DMT believes me to be that its adsl1, but I note full stats show some adsl2 framing info to do with error correction, so it could still be adsl1 with a DSLAM running in
S=1/2mode just like some of BTw's MSANs were capable of in the days of MaxDSL.
As regards to the upstream attenuation, that just looks plain wrong.
1) The Upstream attenuation should normally be somewhere around half of the downstream.
2)
If the upstream atten really
was fluctuating by that much then surely the line would be sick and you would be seeing changes in SNRm or less sync speed.
3) All the other stats seem to show a healthy line
I therefore suspect its more likely to be a router reporting issue?
