LevelOne MSL-3S79 - Manual (Page 18)

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3.3 Power On
Connect the power cord to the power socket at the rear panel of the Switch. The other
side of power cord connects to the power outlet. The internal power can work with AC
in the voltage range of 100-240VAC/ frequency 50~60Hz or 12-48VDC (It’s optional).
Besides, The AC and DC input can be used for redundant power supply. When one
fails, another one is able to keep providing power to the switch. Check the power
indicator on the front panel to see if power is properly supplied.