HP NC510C PCI-E 10 Gigabit Server Adapter - Manual (Page 7)

Introduction 7
LED indicator Status Description
Link/Act. Off No link to the adapter is established.
The adapter is not receiving power or
the cable connection is faulty.
On (Green) Link to the adapter is established. The
adapter is receiving power and the
cable connection is good.
Flashing (Green) The adapter is sending or receiving
network data at up to 10 Gbps.