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For the standard Ethernet port

Yellow: comes on when 100BASE-TX is being used. It comes off when 10BASE-T is being used.
Green: comes on when the printer is properly connected to the network.
For the Gigabit Ethernet board

Yellow: comes on 100BASE-TX is being used.
Green: comes on when 10BASE-T is being used.
Green and yellow lamps come on when 1000BASE-T is being used.