After many weeks of issues with my line, and a couple of BT engineer vists, the line is now new from Master Socket to the Pole. Also I suspected my trusty 585V6 was giving up the ghost as after the line replacements, I had periods of instability, and then stability. Replaced the router with a 2wire 2700HGV, and currently has no resyncs for over 12days. Margin is still stuck at 15dB, but I realise that it does take a while with the 21CN DLM to even consider lowering the margin.... I have attached some info from the router and would be grateful if anyone could offer advice on the stability of this line, and would it support a margin of 9dB. The rate was set with a 15dB margin, but have noticed it never goes below 12dB.
Cheers for any assistance