Description: Noise margins are important for line robustness and need to be configured independently from other spectrum related parameters to reduce the amount of combinations. These parameters may be adjusted because of the changed disturber's impact while data rates aren't changed. Entries in this table MUST be maintained in a persistent manner. A default profile with an index of '1' will always exist and its parameters will be set to vendor-specific values, unless otherwise specified in this document. The index of this entry is hwVOPSNRMarginConfProfIndex.