Dell PowerEdge C8000 - Manual (Page 22)

22 About Your System
BMC Heartbeat Indicator Codes
The system board includes a BMC heartbeat indicator (LED17) for
debugging the Baseboard Management Controller (BMC). The BMC
heartbeat indicator lights green when power is supplied to the sled and blinks
green when the BMC firmware is ready.
Figure 1-7. BMC Heartbeat Indicator
1 system board 2 BMC heartbeat indicator