TP-Link TD-W8901N User Manual page 56

 QoS: Select this option to Activate/Deactivate the IP QoS on different types (IP ToS and
DiffServ).
 Summary: Click the button to view the configurations of QoS.
 Rule: Configure the rules for QoS. If the traffic complies with the rule, then the Router will take
the corresponding action to deal with it.

Rule Index: Select the index for the rule you want to configure.

Active: Activate the rule. The rule can take effect only when it is activated.
TD-W8901N 150Mbps Wireless N ADSL2+ Modem Router User Guide
Figure 4-32
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