D-Link DSL-2790U - Quality of Service (QoS); QoS Setup

72D-Link DSL-2790U Wireless N300 ADSL2+ Modem Router User Manual
Section 4 - Conguration
Quality of Service
QOS SETUP
To enable Quality of Service (QoS), click Quality of Service.
Under Select Default DSCP Mark, select the required DSCP mark or leave the default setting
in place.
Click Apply when you are done.