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You can set the speed that the printer will use for Ethernet communication. Usually, you should set the printer to select the Ethernet speed automatically. This setting allows two interfaces to determine the optimum speed when they are connected.
A connection cannot be established if the selected Ethernet speed does not match your network's transmission speed.
Press the [Menu] key, and then select the setting items using the [
] or [
] key.
Select [System Settings] 
Press [OK]
Select [Interface Settings] Press [OK]
Select [Network] Press [OK]
Select [Ethernet Speed] Press [OK]
Select the Ethernet speed Press [OK]
