I decided to download a copy of G.992 for bedtime reading. One of the first things to catch my eye was the wonderfully named 'dying gasp' message. This seems to be a mechanism wherby the router, in the event of power-loss, is supposed to retain (say, in a big beefy capacitor) just enough energy to communicate the fact to the DSLAM in a 'dying gasp' message.
It set me to wonder, does/should DLM take notice of 'dying gasp' messages, and so tell the difference between frequent power-offs and other perceived instability? Moreover, should it actually be safe to power on/off a router as often as you like as long as it's working properly (sends the dying gasp messages)?
From what I recall, the one time I got penalised by DLM I'd been pulling the plug on the modem lead rather than powering off the router.
I'm afraid I don't feel like volunteering to try this out, so don't ask