DLM won't take any action on a line that resyncs once or twice.
If you have ongoing work in the house which involves the power going on and off and the line resyncs 10 times it is likely to be banded by the DLM.
The same goes for swapping modems or tweaking modem settings that cause it to reboot.
The DLM monitors lines using 15 minutes bins. A line losing sync and then syncing again within the same 15 minute bin counts as a strike against the line and is seen as instability.
Modems can send a "Dying gasp" to tell the other side "this resync/power down was intentional and isn't instability " but the DLM ignores dying gasps.
I only advise leaving 30 minutes between taking sync down and bringing sync back up if you intend on doing this multiple times.
1 or 2 resyncs never results in action being taken.
How many resyncs are permitted depends on the DLM policy your ISP uses.
A (fairly) recent ISP briefing from OpenReach informed them of MTBR changes (Mean time between resyncs) for some of the DLM policies.
I believe this reduced the daily allowed count for a line to be treated as "good" from 10 to 5 resyncs, though I'd need to double check that.
As above it isn't necessary for a single resync or even a couple resyncs.
It shouldn't be necessary at all for the IP profile to update correctly.
Edited by j0hn83 (Sun 18-Oct-20 13:21:45)