Intel Ethernet X520 10GbE Dual Port KX4 Mezz User Manual page 114

The Intel® Ethernet Server Adapter X520-T2 has the following indicator lights:
The Intel® Ethernet 10G 2P X520 Adapters have the following indicator lights:
Label
ACT
LNK
Label Indication
LNK (green/yellow) Green on
Yellow on
Off
ACT (green) Green flashing
Off
Indication
Green flashing
Off
Green on
Yellow on
Off
Meaning
Operating at maximum port speed.
Operating at lower port speed.
No link.
Data activity.
No activity.
Meaning
Data activity
No link
10 Gbps link
1 Gbps link
No link