LevelOne GSW-2457 - Manual (Page 9)

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Figure 2-2 Fasten the Switch in the rack
2.3 Power On
GSW-1657/GSW-2457 16/24-port Gigabit Ethernet Switch is powered by AC
power supply. Powering on the Switch, it will automatically initialize and its LED
indicators should respond as follows:
1） All of the Link/Act and 1000Mbps LED indicators will flash momentarily for
one second, which represents a resetting of the system.
2） The Power indicator will light up.
If the LED indicators don't respond as described above, please check the
power supply and connection.