D-Link DGS-1224T Manual page 29

To change the port setting, click on the ID parameter to enter to the
selected port to configure its Speed/Disable, Flow control and QoS
setting.
Figure 18
Speed/Disable:
This setting has six modes— 100M Full , 100M Half , 10M Full , 10M
Half, Auto and Disable — for speed or port disable selections.
Flow Control:
This setting determines whether or not the Switch will be handling
flow control. Set FlowCtrl to Enable for avoiding data transfer
overflow. Or it sets to Disable ; there is either no flow control or other
hardware/software management.
When the port is set to forced mode , then the flow control will
automatically set to Disable.
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