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(4.3) Rule of class B
(1) Case 1
AU2700/5400
A
ACK
C
Host
B
t3<(2) Case 2 AU2700/5400 A B HostACK t3<(3) Case 3 AU2700/5400ACK Host A C t4< t2<(4) Case 4 (Abnormal Case 1) AU2700/5400 A A B HostNAKNAK t3<
(2) Case 2
t3<(3) Case 3 AU2700/5400ACK Host A C t4< t2<(4) Case 4 (Abnormal Case 1) AU2700/5400 A A B HostNAKNAK t3<
(3) Case 3
t4< t2<(4) Case 4 (Abnormal Case 1) AU2700/5400 A A B HostNAKNAK t3<
(4) Case 4 (Abnormal Case 1)
NAK
t3<