Dell UltraSharp 27 User Manual page 26

RJ45 Connector LED status:
LED Color
Right LED Amber or Green Speed indicator:
Left LED Green
NOTE: RJ45 cable is not a standard in-box accessory.
26 | About your monitor
Right LED
Left LED
Description
• Amber On - 1000 Mbps/2.5 Gbps
• Green On - 100 Mbps
• Off - 10 Mbps
Link / Activity indicator:
• Blinking - Activity on the port.
• Green On - Link is being established.
• Off - Link is not established.
LED