This attribute is migrated to the AtmTmProv group.
This attribute specifies the quality of service for the forward
direction for this connection. This attribute is only used for SPVC
connections.
Class 1 supports a QOS that meets Service Class A performance
requirements (Circuit emulation, constant bit rate video).
Class 2 supports a QOS that meets Service Class B performance
requirements (Variable bit rate audio and video).
Class 3 supports a QOS that meets Service Class C performance
requirements (Connection-Oriented Data Transfer).
Class 4 supports a QOS that meets Service Class D performance
requirements (Connectionless Data Transfer).
Class 0 is the unspecified bit rate QOS class; no objective is
specified for the performance parameters.