accessSwitchVdslVtuoConfMinSnrMgn 1.3.6.1.4.1.890.1.5.12.1.1.1.10.1.6

Configured Minimum acceptable Signal/Noise Margin in 0.01dB. If the noise margin falls below this level, the modem should attempt to increase its power output. If that is not possible the modem will attempt to re-initialize or shut down.