D-Link DES-1228 User Manual page 39

("From Port" and "To Port"), the Speed can be set for all such ports,
by clicking Apply. To refresh the information table to view the latest
Link Status and Priority, press the Refresh button.
Speed: Gigabit Fiber connections can operate in Forced Mode settings
(1000M Full), Auto, or Disable. Copper connections can operate in
Forced Mode settings (100M Full, 100M Half, 10M Full, 10M Half),
Auto, or Disable. The default setting for all ports is Auto. 100Base-FX
Fiber supports 100M full/half force mode.
NOTE: Be sure to adjust port speed settings appropriately after
changing connected cable media types.
Link Status: Reporting Down indicates the port is disconnected.
Figure 25 – System > Port Setting
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