LevelOne ProCon GSW-2496 - Manual (Page 73)

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Bit 0, Bit 1, Bit 2:
According to the arrangement of Bit 5 ~ Bit 7 in TOS Field of IP Header, it
can form 8 kinds of traffics, including 0 0 0, 0 0 1, 0 1 0, 0 1 1, 1 0 0, 1 0
1, 1 1 0 and 1 1 1.
Class:
8 kinds of traffic as mentioned above, user can set up High Priority or Low
Priority for each port respectively.