D-Link DUB-H4 Quick Installation Manual page 3

LED Indicator Description
The DUB-H4 features five LED indicators...
• The Power LED indicator is green and lights up when the DUB-H4 is powered on by
using the external power adapter. The DUB-H4 does not run on power supplied from
the computer (bus powered).
• The downstream LED indicators are green. Each port has one status LED. The LED
lights to indicate that the port is working.
• If a port becomes overloaded, a "current exceeded" event will take place. The LED of
the port will go off and the message "USB HUB Current Limit Exceeded" appears on
the monitor. Reset the DUB-H4 by disconnecting it for 5 seconds and then powering it
back on by connecting the AC power adapter.
Port 1-4 LED:
Green = Ports are Active
Off = Ports are Inactive
Power LED:
Green = Power is On
Off = Power is Off
Tips
• When connecting USB cables between USB devices and the DUB-H4, make sure that the
cable is connected securely.
• Remember that when connecting USB 1.1 devices to a USB 2.0 hub or host adapter, the
USB 1.1 device will not work at USB 2.0 speeds.
• The DUB-H4 does not have an on/off switch. It is always on, once the external power
adapter has been plugged into a wall socket or power source.
• Connecting USB 1.1 devices to the DUB-H4 may cause all USB devices connected to the
hub to work at USB 1.1 speed. To ensure 480Mbps throughput for your USB 2.0 devices,
don't connect USB 1.1 and USB 2.0 devices to the hub at the same time.
• D-Link recommends that while using a USB device that includes an AC power adapter, that
you use the power adapter to ensure proper power and current supply to that device.
• Please remember to unplug devices properly to ensure that no data loss or corruption
takes place with your operating system.