ADLINK cPCI-6S10 - Manual (Page 18)

8 Specifications & Board Interfaces
Rear IO GbE Status LEDs (LP1 - LP20)
SFP+ Status LEDs (XE 0 - XE 1)
Upper LED
On: Link up
Off: Link down
Lower LED
Blink: Packet Activity
Link LED (Green)
ON: Link up
OFF: Link down
Act LED (Orange)
Blink: Packet Activity