Sorry, I don't know what happened with the link.
Your noise margin is indicative of a fault somewhere and as your speed is lower than the handback threshold they should send an engineer to investigate.
I'm assuming you have tried connecting directly to the test socket to rule out any internal problem.
Thanks for that. Yes, I have been through all the tests with BT support at least twice and changed the filter for a new one. The second time the guy was very helpful and arranged a visit. It was cancelled the day after by Openreach because they said they had found an exchange fault and fixed it. I had a similar problem 3 years ago after a thunder storm. We had a storm a couple of weeks back with a lightning strike less than a 1/4 of a mile away. My guess is it did some damage somewhere. How do I get them to arrange a visit?
By waiting for DLM to automatically restore your speed when it is satisfied your line can cope I'm afraid.
I am really confused now, somebody has said there is a noise fault and we need an engineer to come out. Others have said it is OK and just needs time although it has been a week so far. I called faults again, they did a test, called back and have booked an engineer straight off so presumably there is a fault.
What you have to remember is folks on here don't have access to the 24/7 stats for your line so everything is best guess from what is available. Either you have an intermittent recurring line fault that is still present and will need an engineer visit to rectify, or the fault has been cleared and DLM will eventually restore your speed.