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USB Peripherals and Hubs
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USB devices were described in 1 as being Plug and Play and hot swappable This means that a USB device can be attached to the computer while the computer is in operation The device will be immediately and automatically recognized and configured The USB system will even provide power to most USB is supported on all devices, such as mice, keyboards, and network Microsoft operating systems from adapters However, devices such as scanners and Windows 95 on The only exceptions are printers must have their own power supply To Windows NT 35 and Windows NT 4; these install a USB device, simply attach its USB operating systems do not provide USB connector into an available USB port The support maximum cable length between any two devices in a USB system is 5 meters USB-compliant computers include two or more ports on the back and front of the computer case USB adapter cards can be added to older computer systems or can be used to expand newer systems The current standard for USB is 20 and it operates at speeds up to 480Mbps USB 11 operated at speeds up to 12Mbps How then can USB claim to support up to 127 devices To create more USB ports, you can use an external USB hub An external USB hub contains one cable and several (up to seven) additional ports (see Figure 2-8) and serves to increase the number of ports available for other devices A USB hub that has its own power supply is preferable to one that doesn t To attach a USB hub, connect its cable to an available USB port at the back of the computer (called the root hub) and plug it in No additional configuration is required To add more USB devices, simply attach them to the USB hub If you require even more ports, add another tier by attaching another hub to the existing one (see Figure 2-9) However, you should avoid connecting more than five hubs together, because to do so could affect device performance
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2: Installation, Configuration, and System Optimization
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FIGURE 2-8
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A USB hub that provides 4 additional USB connections
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FIGURE 2-9
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USB hubs can be added to make more ports available
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Portable System Components
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IEEE-1394 or FireWire
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IEEE-1394 systems support Plug and Play and hot swapping However, IEEE-1394 is more expensive than USB IEEE-1394 runs at speeds to 400Mbps IEEE-1394 is typically used for devices that require fast transmission of large amounts of data, such as video cameras and digital versatile disc (DVD) players IEEE-1394 is often referred to as FireWire, the trademarked name given to Apple Computer s IEEE-1394 systems IEEE-1394 is also referred to by other manufacturer-specific names, such as ilink or Lynx FireWire systems can support up to 63 external devices from a single port Like SCSI, FireWire devices are attached in a daisy chain (peer-to-peer) topology No single cable in the system can exceed 4 meters To attach an IEEE-1394 device, simply plug it into the port of the last device in the chain The FireWire system will provide the device with power and will automatically detect and configure it To use FireWire, your computer must be running Windows 98 or higher, and you must have an IEEE-1394 controller If the computer didn t come with a controller preinstalled, you USB systems support most can add one yourself The controller is installed kinds of peripherals IEEE-1394 (FireWire) using the same procedures for installing other systems support specialized high-data/ expansion cards FireWire controllers are Plug high-speed devices such as video cameras, and Play, so there is no need to load device hard drives and DVD players drivers or configure system resources
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CERTIFICATION OBJECTIVE 204
Portable System Components
Portable computers tend to be what you see is what you get (WYSIWYG) systems In other words, because they are proprietary, they are very difficult to upgrade, and you are pretty much limited to using the components that came with the system However, because of their compact size, many portable components, such as the keyboard and pointing device, can be difficult to use For this reason, most portables allow you to temporarily attach easier-to-use desktop devices, for times when you are not in transit
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