Identifies the quality of service desired.
NOTE 1: The TOS provides an indication of the abstract parameters which characterize the service choices provided in the network.
NOTE 2: The TOS and DSCP fields are mutually exclusive as they utilize the same byte position in the Internet Protocol header.
VALID ENTRIES:
NOTE 1: TOS is an 8 position field but positions 7 and 8 are reserved for future use.
NOTE 2: When populated the first six positions must contain a “0” or a “1”.
USAGE: This field is conditional.
NOTE 1: Optional when the associated LREF field is populated and the associated DSCP field is not populated, otherwise prohibited.
DATA CHARACTERISTICS: 8 numeric characters
EXAMPLE: 0 0 0 0 1 0