Nucleus is based on a NUC; therefore, page 25 of the NUC manual spells out the Ethernet LED decode. With the Nucleus, they substituted amber for yellow. If there is any confusion, hope this helps Nucleus owners. The manual sux…
Link Green
Off: LAN link not established
On: LAN link is established
Blinking: LAN activity
Data Rate Green/Yellow
Off: 10Mbps
Green: 100Mbps
Amber: 1000Mbps