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USB Graphic Adapter(Notes & Frequently Asked Questions)?

Q1: What is a USB hub ?
A1: USB hub typically consists of a single upstream port (designed to connect directly to your computer or to another hub) and multiple downstream ports.
Q2: How Many USB hubs can I connect together ?
A2: In total you should only connect 5 tiers of USB hubs together. A tier is defined by the number of hubs a device's signal must pass through before it reaches the host. For example, using a 4-port USB hub, you could connect a theoretical maximum of 341 hubs in five tiers, this would leave you with an incredible 1024 ports to connect USB devices! But you should only connect 127 devices together at any time.
Q3: What software is needed to get the USB Hub to work?
A3: No software is required as long as your computer can support USB Devices.
Q4: How far can a USB Device be away from the USB Hub?
A4: 5 meters is the maximum distance between each connected device and the USB Hub.
Q5: Is a power supply needed for the USB Hub?
A5: • The power supply is not needed if using low speed devices (1.5 Mbps) such as joysticks, mice and keyboards
• For full speed devices (12 Mbps) you must have the USB Hub in Self-powered mode. The USB Hub is a full speed device, so if you are connecting anohter USB Hub, you must use a power supply with the USB Hub you are connecting to
• If you are using the 7-Port USB Hub, you must attach the power supply to access the 3 side ports
Q6: What is the difference between Self-powered mode and Bus-powered mode?
A6: • Self-powered mode means the USB Hub is being powered by an external power supply. If a device connected to the Hub needs more power (such as a scanner or a cascaded USB Hub) you will need to connect the adapter. The 3 side ports on the 7-Port USB Hub will only work if in Self-powered mode
• Bus-powered mode is when there is no external power supply connected to the USB Hub. This will allow low speed devices such as mice, keyboards and joysticks to work
Q7: What's the difference between IEEE1394 and USB?
A7: Many people may get confused about 1394 and Universal Serial Bus(USB). It's understandable. Both are technologies that offer a new method of connecting multiple peripherals to a computer. Both permit peripherals to be added to or disconnected from a computer without the need to reboot. Both use thin, flexible cables which employ simple, durable connectors.
But there the similarities end. Although 1394 and USB cables may look nearly the same, the amount of data flowing through them is quite different. As the chart below shows, the widely different data transfer rate capability of 1394 and USB marks the principal distinction between these two technologies:
Today, 1394 offers a data transfer rate that is over 16 times faster than USB. In addition, 1394 has a well-defined bandwidth roadmap, with speed increases to 400mbps (50MB/sec) and possibly 800mbps (100MB/sec) expected in 1998, and 1Gbps+(125MB/sec) and beyond In succeeding years. Such dramatic improvements in data transfer capacity will be required to keep pace with bandwidth hogging devices, such as HDTV, digital set-top boxes and home automation systems, that plan to incorporate 1394 interfaces.
Does this mean that 1394 will "win" the interface war with USB?
No. That's because there is no need for a winner. Most industry analysts expect 1394 and USB to coexist peacefully in computers of the future. Small 1394 and USB connectors will replace the gaggle of connectors found on the back of today's PCs. USB will be reserved for low badwidth peripherals (mice, keyboards, modems), while 1394 will be used to connect to the new generation of high-bandwidth computer and consumer electronics products.
IEEE1394 (fireWire) USB (Universal Serial Bus)
Maximum Numberof Devices 63 127
Hot - Pluggable Yes Yes
Cable length limitation Between Devices 4.5m 5m
Data Transfer Rate 100/200/400 today 800/Mbps~1Gbps+ upgrade 12Mbps today USB2.0->480Mbps
Macintosh Implementation Yes iMac only
Internal Peripheral Connection Yes No
Peripheral Devices • DV Camcorders
• High-Resolution
Digital Cameras • HDTV
• Keyboards
• Mice
• Monitors
• Joysticks
• Set-Top boxes
• Hard Disks
• DVD-ROM Drives
• Printers
• Scanners
• Low-Resolution
Digital Cameras • Low - Speed CD-
ROM Drives • Modems
Simple Installation Yes Yes
Q8: How to easily use USB 2.0 device under Windows 98SE/ /ME /2000/XP?
A8: The easy way to use USB 2.0 device on Windows OS series is that upgrading Windows OS to Win 2000+SP4 or Win XP+SP1 version from the Microsoft website due to Win 2000+SP4 or Win XP+SP1 supports USB 2.0 Specification with build-in driver provided on system.
Q9: Why USB 2.0 cardbus card needs the additional power supplied?
A9: The bus-power mode of cardbus card doesn't support enough current for the hub electricity requirement, so it needs more power supplied in order for the hub electricity requirement.
Q10: How to use the USB + Firewire combo hub?
A10: Both the USB and Firewire specifications are two independent modes in combo hub, so the combo hub needs to use USB cable to connect to host via upstream port and use IEEE 1394 cable to connect to host via FireWire port and also need to plug the power adapter; then all ports on combo hub can work normally.
Q11: What kind of Windows system needs driver installed for USB2.0 PCI Host Device?
A11: The Windows system Win98SE/WinME/Win2000/Win XP needs to install driver by vendor supply but the Win2000+SP4 & Win XP+SP1 doesn't need to install driver owing to they do support USB 2.0 Specification and provide build-in driver.