UTP Port LEDs
link/activity located on the upper left corner of each utp port, this led indicates a valid link if displaying a steady green light, and will blink when data is being transmitted via that port connection.
10/100 mbps on the upper right corner of each twisted-pair port, this led will light when the connection speed is operating at 100 mbps. an unlit led indicates a connection speed of 10 mbps if the port has a valid link.