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The D-Link DUB-H4 2.0 is a high-speed universal serial bus 2.0 four-port hub that is backward compatible with USB 1.0 and 1.1. It provides the ability to connect up to four USB devices to your PC. The DUB-H4 provides four Type "A" downstream ports and a single Type "B" upstream port. The Type "B" port is usually connected to the host computer, or it can be connected to another hub or a chain of hubs to enable up to 127 devices to be connected to your PC.
This USB 2.0 hub supports both low-speed and high-speed devices, as all other USB 2.0 devices should. Low-speed devices operate at 1.5 Mbps or 12 Mbps, while high-speed devices operate at 480 Mbps. Each port on this hub creates a bridge between the attached device and the host computer.
Our test unit came in a securely sealed, molded plastic package similar to the types that are shown in store displays. Needless to say, without scissors or a knife this package is a bear to open. Inside the package, you will find the DUB-H4 USB 2.0 Hub, an AC adapter, a six-foot USB 2.0 A to B cable, the Installation Guide and the warranty card.
All of the indicators are on the front of the unit, where the Type A connectors are. There is one power-indicating LED, which illuminates red when power is connected. Each port has a status-indicating LED to indicate whether the downstream port is working or not. The LED will illuminate green if the port is working; if the port is not working, the LED will be off.