Answer

Link/Activity:

• When the left LED is illuminated it indicates a valid link to a network switch.
• The left LED blinks at a nominal rate while there are network transmissions in process, which should be most of the time once the Core has booted.

Link Speed: 

• If the Link LED is illuminated, but the Link Speed LED is not, the Core has established a 10 Mbps link to a switch.
• If the Link Speed LED is illuminated GREEN, the Core has established a 100 Mbps to a switch.
• If the Link Speed LED is illuminated ORANGE, the Core has established a 1000 Mbps link to a switch.