D-Link 16-Port 10/100/1000Mbps Gigabit Ethernet Switch + 2-Port Mini GBIC Web-Smart Switch DGS-1216T - Manual (Page 21)

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UNDERSTANDING LED INDICATORS
The front panel LEDs provides instant status feedback, and, helps
monitor and troubleshoot when needed.
Figure 6. LED indicators of the Switch
Power and System LEDs
POWER: Power Indicator
On : When the Power LED lights on, the Switch is receiving power.
Off : When the Power turns off or the power cord has improper connection.
CPU: Management Indicator
Blinking : When the CPU is working, the System LED is blinking.
On/Off : The CPU is not working.