>> did not actually change the line card but they did a lift and shift which effectivly uses a different line card
That makes much more sense!.. and ties in more with what I was saying previously.
>> Could it be with zero real traffic the Tone noise margin summation logic goes into sleep mode as there's nothing there to detect ?
Im not 1--% certain, but I'm pretty sure it should continue to monitor. My own line is monitored 24/7 and I see shifts recorded on my graphs even when I'm not around.
Ive hardly been here the past few days and therefore hardly any traffic, yet throughout that period my graphs have continued to show many many changes both up and down regardless that there was no data being processed at the time.
I cant see from the graphs what scale/how much SNR was being fluctuated by. I dont know if it is possible for an own line to cause some sort cross-talk effect on itself when passing data.. as strictly speaking I thought x-talk affected neighbouring lines.
