D-Link DES-815 User Manual page 22

The following section describes these indicators in detail.
Power LED
This indicator is green when power is supplied to the device.
The Power LED lights when you connect the power cable to
the power receptacle at the rear of the device, and then plug it
in to a power outlet.
Link/Act LED
This indicator is green when the respective port is properly
connected to a powered-on device and blinks green when
packets are being transmitted or received.
FDX/Collision (Col) LED
This indicator is green when the respective port is operating in
full-duplex mode. Otherwise it is off for half-duplex operation.
This indicator blinks yellow when there are collisions
occurring on the respective port.
System Load LED Meter
This LED meter indicates the current system load (from "Low"
to "High"). The meter functions to indicate that the switch is
currently operating and at what level of aggregated traffic.
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Figure 2 LED Indicators
Overview