CODE: 1100 0110
LENGTH: 1 octet
VALUE: BIT OPTION
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4 =1 : use of network expedited in class 1
=2 : non-use of network expedited in class 1
3 =0 : use of receipt confirmation in class 1
=1 : use of explicit ACK variant in class 1
2 =0 : 16-bit checksum shall be used in class 4
=1 : 16-bit checksum shall not be used in class 4
1 =0 : use of transport expedited data transfer service
=1 : non-use of transport expedited data transfer service
Default value = 1.