D-Link DSL 2740B - Manual (Page 56)

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WLAN QOS
WLAN QoS (Quality of Service), also called WMM (Wi-Fi Multi-media), is used to prioritize the wireless packets
when you are using wireles device transmitting delay-sensitive packets (voice, video,..etc).
Notice WMM is not supported by IEEE 802.11n yet. You must trun off 802.11n in
ADVANCED WLAN section before configuring any WMM settings.
1. Select Enabled from the WMM(Wi-Fi Multimedia) drop-down list.
2. Select Disabled from the WMM No Acknowledgement drop-down list if your wireless link quality is good. It
can increase more bandwidth. Or select Disable if your link quality is an issue.
3. Click the Add QoS Entry button to enter QoS configuration window.