ADLINK aTCA-9300 - Manual (Page 14)

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2.3.2 Status LED Definitions
The following sections describe the front panel Status LEDs: Hot-swap LED, OOS LED,
BIOS/OS Boot OK LED, IPMC Payload Power Authorized LED and IPMC Chassis Identify
Command LED.
2.3.2.1 Out of Service (OOS) LED
Out of Service LED (Red)
State Remark
Blinking During BIOS POST M4
Off BIOS POST OK M4
On After OS shutdown M1
Hot-swap LED
Hot-swap LED
(Blue)
FRU State
number FRU State Name
Off M0 FRU not installed
On M1 FRU inactive
Long blink M2 FRU activation request
Off M3 FRU activation in process
Off M4 FRU active
Short blink M5 FRU deactivation request
Short blink M6 FRU deactivation in process