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Nowadays, majority of the external devices have USB connectivity. Majority of the laptops come with two USB ports in the front and few at the back. Hence, there is great possibility that you might face a shortage of USB ports on your system if you want to use multiple USB devices simultaneously. A USB hub is a small device that provides multiple ports to connect USB devices.
USB hub is the easiest option available if you want to save yourself from the constant struggle of plugging and unplugging USB devices. It is also a cost effective option than upgrading your system in order to get more USB ports. In addition, these devices can be useful if you use mini laptops as they generally have only 2-3 USB ports.
Powering mechanism:
All non-root hubs are either self-powered (bus-powered) or AC powered (external supply). Self powered hubs draw power from one of the USB ports from the system. These self-powered hubs are ideal to connect various devices such as card readers, digital cameras, MP3 players, keyboards, mice, handheld USB devices and memory sticks.
However, you will need an AC powered USB hub to connect larger devices such as printers, fax machines, scanners and external drives. The AC powered hub draws from external supply (AC socket) and comes with an AC adapter. It automatically detects the speeds of attached USB device and helps the device to run at fastest speed it can support.
D-Link 4-Port Hub:
This device is a bus-powered hub. It complies with USB 1.1 and USB 2.0 specifications. It supports up to 480 Mbps data transfer rate and offers plug and play connectivity to variety of external devices that support USB connectivity.
The D-link USB hub can be used on PC as well as Mac. The device features a single upstream USB port that connects with the system, while the four downstream ports can be used to connect external USB devices. The devices also features diagnostic LED's for all ports that are useful to determine the status and data transfer at each port.
The powered USB hub provides increased ports to connect to various digital devices. It can work as a port replicator even for resource crunched mini laptops.
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