D-Link DSL-2640B - Manual (Page 60)

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Wireless—QoS
WMM (Wi-Fi Multimedia) technology is available on the wireless router, allowing you
to give multimedia applications a higher quality of service and priority in a wireless
network so applications such as videos will be of higher quality. Enabling WMM may
delay the network traffic of other lower assigned quality applications.
WMM No Acknowledgement
can be enabled if you enable WMM which refers to the
acknowledgement policy used at the MAC level.
To create a QoS entry, click the Add QoS Entry button to proceed to add or remove
traffic class rules for your network. Click on Save/Apply WME Settings.