Toshiba USB Port Replicator II - Manual (Page 5)

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LED Indicator
Power Indicator
The Power Indicator will turn ON when bus power is supplied.
USB Indicators
There are four USB indicators to show if the USB Downstream Ports are ready for
use.
1. If the USB Port-Replicator is not ready for use or only bus power is supplied, the USB
Indicators will turn OFF, and the USB Downstream Ports can not be used.
2. If the USB Port-Replicator is ready for use, and external power is supplied, the USB
Indicators will turn ON, and you can use all the functions of USB Port-Replicator.
3. If over-current happens for certain USB Downstream Port, the corresponding
USB Indicator will turn OFF to indicate that this port is not working now.
4. When over-current situation is solved, the USB Indicator will turn ON again.