The first steps I can understand.
- Line is on open profile for 2 days
- DLM starts on day 2. By default interleaving will be applied - or rather more correctly INP 3
- 3-5 days for Re-Tx to be applied.
Why yours took so long for g.inp to kick in Ive no idea, but Im glad for your sake that it finally has. It's the 3rd step for new lines that appears to be showing some varience.
IMHO Openreach have steps 2 & 3 backwards. If retransmission is available, then it should be applied by default rather than interleaving.
I wonder if it perhaps why it doesnt, has something to do with how trying to apply re-tx on lines that arent fully able to cope with it affected both upstream and downstream speeds.
One of the things we noticed is that rather than the usual INP 3, the INP value would be somewhere in the 40-50 region. (which we would expect for G.INP). It became unbundantly clear during G.INP mk1 that there were far more 'incompatible' modems in use than Openreach anticipated, so they did a botch job by only applying G.INP/INP on the upstream for lines that needed it for stability... and at the same time changing downstream to have INP applied first by default then G.INP at a later date.