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Introduction to USB 2.0 and Helpful Tips
Introduction
USB stands for Universal Serial Bus. It is a standard for connecting exter-
nal devices to your computer quickly and easily. One of the nice things
about USB is that power can be provided to the USB device through the
USB cable. However, some devices such as printers need more power
than the USB ports can provide, so those devices will have to use an
external power source. USB also allows the device to be connected and
removed from the PC without the need to shut -down the computer.
USB 2.0 is the second generation standard that improves on USB 1.1 to
provide faster and more reliable data transfers. USB 1.1's speed of
12Mbps is extended to 480Mbps in USB 2.0. The improved speed and
bandwidth opens up the possibility for newfound solutions such as external
backup or data storage solutions, as well as digital audio and video
solutions.
One important feature of the USB 2.0 standard is that it is backward
compliant with USB 1.0 and USB 1.1. This means that all of your current
USB products will work with USB 2.0 adapters.
Many USB products are widely available on the market and more are
being developed for future release. Because of the high speed of the USB
interface, a USB hub can be used to connect more than one USB device
to one USB port at one time. The USB standard specifies that up to 127
devices can be connected to your computer.
Helpful Tips
When connecting the USB cable to the computer, make sure that the
•
USB cable is inserted securely.
Remember that when connecting USB 1.0 or USB 1.1 products into a
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USB 2.0 adapter, the USB 1x product will not work faster.
To ensure optimal performance when using USB 2.0 devices, use a
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USB 2.0 certified cable such as the DUB-C5AB.
The DFB-A5 USB ports will work in Macintosh OS 8/9 at USB 1.1
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speeds using the built-in drivers for the appropriate operating system.
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