CADnetwork Deep Learning Box Rack Technical Specification page 26

3. Hard disk activity LED (HDDLED1)
This LED is for the storage devices connected to the onboard SATA, or SATA/SAS
add-on card. The read or write activities of any device connected to the onboard SATA,
or SATA/SAS add-on card causes the rear panel LED to light up.
4. Baseboard Management Controller LED (BMCLED1)
(for (BMC) only)
The BMC LED works with the ASMB management device and indicates its initiation
status. When the PSU is plugged and the system is OFF, ASMB management
device starts system initiation for about one (1) minute. The BMC LED blinks after
system initiation finishes.
This LED is only enabled for the (BMC) model.
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Chapter 1: Product Introduction