Supero SC512 Chassis Series User Manual page 29

Chapter 4: System Interface
 NIC2: Indicates network activity on GLAN2 when flashing.
 NIC1: Indicates network activity on GLAN1 when flashing.
 HDD: Indicates IDE channel activity. SAS/SATA drive, SCSI drive, and/or
DVD-ROM drive activity when flashing.
 Power: Indicates power is being supplied to the system's power supply units.
This LED should normally be illuminated when the system is operating.
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