I can't answer your question, but consider readers also need to be aware of your previous thread
I believe the two threads are closely connected and the information the information in that thread relevant.
It does appear to me from the seemingly fixed 44Mpps and high noise margin that DLM may have applied banding. That doesn't explain what is happening re the attenuation. It is the system trying to cope with whatever is going on.
Kindness isn't going to cure the world of all its awfulness but it's a good place to begin. Daisy Ridley.
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Edited by RobertoS (Mon 10-Oct-16 18:39:34)