This attribute specifies the value of the best effort parameter in the
ATM Traffic Descriptor Information Element. This attribute is only
used for Soft PVC connections. It is one of the Broadband Bearer
Capability attributes.
The value indicated implies that the quality of service for this
connection is not guaranteed.
The value notIndicated implies that the quality of service for this
connection is guaranteed.
The value derivedFromServiceCategory specifies that the actual
value which is used for this connection is derived from the value of
the atmServiceCategory. Either, this attribute must be set to
derivedFromServiceCategory, or the atmServiceCategory attribute
must be set to derivedFromBBC, but not both.