Apple M9690LL User Guide - Page 35

Using Multiple USB Devices at the Same Time, Getting More Information About USB

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Using Multiple USB Devices at the Same Time You can purchase a USB hub to connect multiple USB devices to your computer. The USB hub connects to an open USB port on your computer and provides additional USB ports (usually four or seven). Hi-Speed hubs can support USB 2.0 Hi-Speed devices as well as USB 1.1 compatible devices. USB 1.1 hubs don't allow Hi-Speed USB devices to operate at their maximum data speed. Some USB hubs have a power adapter and should be plugged in to an outlet. Note: If you are using a chain of USB devices and hubs, some USB devices may not work when connected through a combination of USB 2.0 Hi-Speed hubs and USB 1.1 full-speed or low-speed hubs. For example, you might not see an external USB hard disk on your desktop. To avoid this problem, do not connect USB devices with different speeds together. Connect your Hi-Speed hub directly to your computer and connect Hi-Speed devices to it. Connect a full-speed or low-speed hub to your computer directly and connect similar speed devices to it. ® USB hub Getting More Information About USB Additional information about USB is available in Mac Help. Choose Help > Mac Help in the menu bar and search for "USB." You can also find information about the Apple USB website at www.apple.com/usb. For information about USB devices available for your computer, check the Macintosh Products Guide at www.apple.com/guide. Chapter 3 Using Your PowerBook 35

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Chapter 3
Using Your PowerBook
35
Using Multiple USB Devices at the Same Time
You can purchase a USB hub to connect multiple USB devices to your computer. The
USB hub connects to an open USB port on your computer and provides additional USB
ports (usually four or seven). Hi-Speed hubs can support USB 2.0 Hi-Speed devices as
well as USB 1.1 compatible devices. USB 1.1 hubs don’t allow Hi-Speed USB devices to
operate at their maximum data speed. Some USB hubs have a power adapter and
should be plugged in to an outlet.
Note:
If you are using a chain of USB devices and hubs, some USB devices may not
work when connected through a combination of USB 2.0 Hi-Speed hubs and USB 1.1
full-speed or low-speed hubs. For example, you might not see an external USB hard
disk on your desktop. To avoid this problem, do not connect USB devices with different
speeds together. Connect your Hi-Speed hub directly to your computer and connect
Hi-Speed devices to it. Connect a full-speed or low-speed hub to your computer
directly and connect similar speed devices to it.
Getting More Information About USB
Additional information about USB is available in Mac Help. Choose Help > Mac Help in
the menu bar and search for “USB.” You can also find information about the Apple USB
website at www.apple.com/usb.
For information about USB devices available for your computer, check the Macintosh
Products Guide at www.apple.com/guide.
®
USB hub