USB hubs are small units with multiple ports for connecting USB devices. They are useful for laptops and older systems with few native USB ports. Hubs can support up to 127 devices and come in self-powered or AC-powered models. Consumers should ensure the hub meets their needs and supports the appropriate USB generation. Hubs are plug ‘n’ play, but caution should be exercised with external hard drives.
It seems that almost all the electronic gadgets produced today make use of the USB port that is always at hand. Early USB-equipped computers typically only had one or two ports located on the back of the case. Newer computers typically have several ports built in, and many cases now place two or more in front. Even so, additional ports are often needed, and having them conveniently accessible makes all the difference. The USB hub does just that.
A USB hub is a small, lightweight unit with multiple ports for connecting USB devices. It is commonly connected to a USB port located on the back of a desktop computer via an extension cable. Once the hub is plugged in, the user can set it up where it’s convenient, avoiding the hassle of accessing the back of the system. A hub is also great for laptops with only one or two ports. When properly connected, some hubs can support up to 127 devices.
A self-powered USB hub can be used to connect digital cameras, card readers, keyboards, mice, MP3 players, memory sticks, and many other portable USB devices. For more rugged components, such as external drives, printers, scanners, or fax machines, an AC-powered device is a better choice. Some of the AC-powered hubs come with an adapter, while others have the capability, but require you to purchase the adapter separately. When shopping for a hub, consumers should be sure they are finding one that best meets their needs.
Another feature to search which generation of USB the hub can use. Each successive generation operates at a faster rate than the previous one. USB 1.1 can transfer data at speeds up to 12 megabits per second (mbps), while USB 2.0 can transfer data at 480 mbps, 40 times faster. Released in 2008, USB 3 has a maximum speed of 625 megabytes per second (MBps).
A USB hub that supports the next generations is often backwards compatible, supporting older devices as well. The hub automatically detects and operates at the fastest speed supported by the device. One that supports 3 can’t “push” a slower device to run faster than its design. Conversely, a hub that only supports 1.1 may or may not support a 2.0 device, but if it does, it will slow it down to 12mbps, the maximum speed supported by the hub.
Virtually all USB devices are plug ‘n’ play or hot swappable, but you should be careful with this feature when using an external hard drive with a USB port. Data may be lost due to software bugs or if the drive is disconnected while it is busy.
A USB hub is an inexpensive and practical addition to any system, especially useful with laptops that typically have few native USB ports and older systems with rear ports. They can be purchased in a four-port model, a seven-port model or higher, and multiple hubs can be used for scalable growth.
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