I've had a few powercuts recently and noticed that when power comes back, the synch speed is about 24Mb with a noise margin of 6dB, which then immediately drops to 0dB (or less!). I then manually reboot it and it reconnects at the usual 21Mb speed & 6dB noise margin, which it stays at.
What could cause the router to be synching at 0dB & an extra high speed upon restoration of power? I'm sure it didn't used to do that. The only difference with recent powercuts is that the power's come back on for about 30 seconds before going off again. I guess the 30 seconds could give the router a chance to start negotiating with the exchange again which confuses it when the power properly comes back on?
Edited by bluesea (Sat 09-Nov-13 15:45:45)