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How to Choose an USB Extension Cable?
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Generally speaking, USB cables are classified into one of two different bandwidth groups: 1.1, which transfers data at a maximum rate of 1.5 Mbit per second, and 2.0, with a 480 Mbit per second data transfer rate. USB 2.0 is backward compatible with the lower data transmission requirements of 1.1, but the substitution can't be reversed; 1.1 just can't deliver the rate of data transfer that USB 2.0-rated devices need.
In addition to the bandwidth classifications listed above, USB devices can also be labeled in the following "speed" categories, which specify the amount of bandwidth they need to operate:
Low Speed: The " low speed" rating indicates that a device requires minimal bandwidth (1.5 Mbit/s) to function, so it can be used in conjunction with either 1.1 or 2.0 USB cables. Joysticks, keyboards and computer mice are a few common examples of low speed devices.
Full Speed: Devices labeled "full speed" need a signal rate of 12 Mbit per second. Since this is such a common bandwidth requirement, all USB hubs on the market have been designed to support Full Speed. And even though the data transfer speed is higher, Full Speed - like Low Speed - transmits equally well via 1.1 or 2.0 USB cables.
High Speed: " High speed" USB devices run at 480 Mbit per second, and require a 2.0-rated USB cable.
One of the most convenient features of USB cables and devices is their ability to be "hot swapped," which means that they can be plugged into - and unplugged from - a computer as needed, without that computer needing to be powered down first.
The simplest way is to look for a certified Hi-Speed USB logo on the retail packaging or on the product itself. The logo is exactly as shown on the right; it tells you what you are plugging into your USB port has passed the Hi-Speed compliance tests, meaning the product can enter Hi-speed USB mode if your system supports it.