Transition Networks MIL-SW8T1GPA - Manual (Page 33)

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QoS Configuration interface
Click DSCP Mapping to enter TOS priority configuration interface
DSCP [0- 63]: The system provides 0~63 TOS priority level. When the IP
packet is received, the system will check the TOS level value in the IP
packet that has received. For example: user set the TOS level 25 is high.
The port 1 is following the TOS priority policy. When the packet received
by port 1, the system will check the TOS value of the received IP packet. If
the TOS value of received IP packet is 25(priority = high), and then the
packet priority will have highest priority
Priority: Select the priority level – high, medium, low, or normal
And then, click Apply to apply the configuration
Or, Click Refesh to reset the configuration before applying