Represents Service Categories used by traffic descriptor. The current Service Categories are defined as follows
(note that Guaranteed Bit Rate (GBR) is not defined because it is generally not used):

- CBR = Constant Bit Rate. For connections that require a sstatic amount of bandwidth that is continuously available
  during the lifetime of the connection.
- rt-VBR = Real Time - Variable Bit Rate. For connections that require tightly constrained delay and delay variation. 
- nrt-VBR = NonReal Time - Variable Bit Rate. For connections that have bursty traffic.
- UBR = Unspecified Bit Rate. For connections that do not require tightly constrained delay and delay variation.
- ABR = Available Bit Rate. For connections that do not require bounding the delay or delay variation. Not intended
  for real-time applications.
- GFR = Guaranteed Frame Rate. For non-real-time applications that may require a minimum rate guarantee and can
  benefit from accessing additional bandwidth dynamically available in the network.
- NA = Not Applicable.

Object Lifecycle: NA

Object Creation Notification Issued? No
Object Deletion Notification Issued? No
