This attribute indicates the quality of service for the transmit
direction for this connection.
The constantBitRate class refers to traffic offered on services such
as a constant bit rate video service. This traffic is highest priority.
The variableBitRate class refers to traffic offered on services such
as packetized audio and video.
The connectionOriented class refers to connection-oriented traffic
such as Frame Relay or X.25 traffic.
The connectionless traffic refers to traffic offered through
connectionless trunks such as certain LAN protocols.
The unspecified class supports a 'best effort' type of service, where
there is a minimum guarantee of bandwidth. This traffic is lowest
priority.
This attribute is obsolete, replaced by the UNI 4.0 attribute
atmServiceCategory.