Understanding Led Indicators; Power And System Leds - D-Link DGS-1216T Manual

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.
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