Thanks Leo, I'm fascinated.
However, this may (almost certainly) be due to ignorance on my part but...
if the modem can cope, the line will adjust without a reset.
How can the line be adjusted, without a reset, other than by SRA?
And regardless of the 'how', if we accept that it 'can', doesn't it render obsolete the concept of a 'target margin', since the target margin is simply the margin immediately after a reconnect, and there will be no reconnect?
- 7LM