Revision - 1.0
Q: How fast is USB 2.0?
A: USB 2.0 is designed to work at up to 480 mbps per
Q: Is USB 2.0 backwards compatible with version 1?
A: USB 2.0 is fully backward compatible with USB v.
Q: What are the differences between versions 1.1 and 2.0?
A: Version 1.1 supports two speeds, 1.5 and 12 mbps.
USB 2.0 supports 1.5, 12 (making it backward compatible), and 480 mbps.
USB 2.0 will likely not completely replace version 1.1.
I/O devices, such as keyboards, mice, and joysticks, have all the bandwidth
they need in USB 1.1.
Q: How does USB 2.0 compare with FireWire?
A: Some say USB 2.0 will likely not replace FireWire (IEEE 1394/FireWire/I-link,
etc.) because FireWire has established its place firmly within many industries,
such as the camcorder industry.
Q: Will Microsoft support USB 2.0 in its 9.X systems?
A: Microsoft will not provide USB 2.0 support for
the Windows 9x platform or Windows NT® 4.0. 3rd party vendors
will make support available for operating systems other than Win 2000 and Win
Q: What operating systems will it support?
A: Windows 2000, Windows XP and all future Microsoft
Q: Is the drive stack between Windows 2000 and Windows
Q: Then how will USB 2 work on Windows 2000?
A: “To support USB 2.0 on Windows 2000, a parallel
(new) driver stack is needed. This driver stack will consist of Usbport.sys,
Usbhub20.sys and Usbehci.sys. A host controller-specific coinstaller (Hccoin.dll)
will also be provided to ensure proper Windows Update installation in the Windows
Q: How do I ensure that my USB 2.0 devices work on Windows
A: QFE 4 for HCT 10.0 includes tests to ensure that
USB 2.0 Hi-Speed devices and USB EHCI host controllers work properly with Windows
Q: What makes USB 2.0 able
to hold 480 Mbs?
A: USB 2.0 will specify a microframe, which will be
a 1msec frame. This will allow USB 2.0 devices to have small buffers even at
high data rates.
Q: Who was involved in the development of USB 2.0?
A: Intel, Microsoft, Compaq, Hewlett-Packard, Lucent,
Philips, and NEC were all involved in the development of USB 2.0.
Q: Are there any other names for USB 2.0?
A: USB 2.0 has been dubbed “USB Hi-Speed,” while USB
1.1 is now to be called “USB Basic Speed.”
Q: Will I have to get a new USB hub?
A: Yes. You may use a USB 1.1 device in a USB
2.0 hub, but not the other way around. If you plug a USB 1.1 into a USB
2.0 chain, all USB 2.0 devices will operate at 1.1 speeds.
Q: What is the maximum length of a USB 2.0 cord?
A: The maximum length is 16.4 feet.
Q: What do I need to upgrade my system to USB 2.0?
A: You will need a USB 2.0 host controller card, a
USB 2.0 driver and an OS that supports USB 2.0. It should cost from US$80
Q: When will USB 2.0 be available for my laptop?
A: Laptop venders will not include 2.0 support for
some time, although third party companies have already debuted USB 2.0 hardware
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