D-Link DIR-120 - Manual (Page 54)

DIR-120 Ethernet Broadband Router
D-Link DIR-120 User Manual 48
QOS Engine
QoS (Quality of Service) menu
Upstream Bandwidth
Use the QoS WAN Upstream Bandwidth drop-down menu to
adjust the upstream bandwidth setting. Please contact your ISP
for more information before changing this setting.
QoS
This feature allows you to improve your VoIP voice quality or
stream by prioritizing it over other network traffic such as FTP
or Web. To use QoS on the Router, tick the Lag eliminated
(VoIP, Streaming) checkbox. Uplink bandwidth can be
configured manually with the Manual Uplink Speed pull-down
menu; or select the Automatic Uplink Speed option to allow
the Router to select the best speed. Click the Save Settings
button at the top of the window when you are finished.