Advantech EKI-6321AG User Manual page 37

2.2.2 QoS Setting
DSCP
Differentiated Services Code Point (DSCP) is a 6-bit field in the header of IP packets for packet
classification purposes. DSCP replaces the outdated IP precedence, a 3-bit field in the Type of Service byte
of the IP header originally used to classify and prioritize types of traffic.
Protocol
Protocol base QoS mechanism differentiate packets by TCP/UDP service port to assign packets in different
priority level.