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Chapter 1: Introduction to the Personal Computer 29USB Ports and CablesThe Universal Serial Bus (USB) is a standard interface that connects peripheral devices to acomputer. It was originally designed to replace serial and parallel connections. USB devicesare hot-swappable, which means that users can connect and disconnect the devices whilethe computer is powered on. USB connections can be found on computers, cameras, printers,scanners, storage devices, and many other electronic devices. A USB hub is used toconnect multiple USB devices. A single USB port in a computer can support up to 127 separatedevices with the use of multiple USB hubs. Some devices can also be poweredthrough the USB port, eliminating the need for an external power source. Figure 1-12shows USB cables with connectors.Figure 1-12USB ConnectorsUSB 1.1 allowed transmission rates of up to 12 Mbps in full-speed mode and 1.5 Mbps inlow-speed mode. USB 2.0 allows transmission speeds up to 480 Mbps. USB devices canonly transfer data up to the maximum speed allowed by the specific port.FireWire Ports and CablesFireWire is a high-speed, hot-swappable interface that connects peripheral devices to acomputer. A single FireWire port in a computer can support up to 63 devices. Some devicescan also be powered through the FireWire port, eliminating the need for an external powersource. FireWire uses the IEEE 1394 standard and is also known as i.Link.The IEEE 1394a standard supports data rates up to 400 Mbps and cable lengths up to 15feet (4.5 m). This standard uses a six-pin connector or a four-pin connector. The IEEE1394b standard supports data rates in excess of 800 Mbps and uses a nine-pin connector.Figure 1-13 shows FireWire cables with connectors.
30 IT Essentials: PC Harware and Software Companion GuideFigure 1-13FireWire ConnectorsParallel Ports and CablesA parallel port on a computer is a standard Type A DB-25 female connector. The parallelconnector on a printer is a standard Type B 36-pin Centronics connector. Some newer printersmay use a Type C high-density 36-pin connector. Parallel ports can transmit 8 bits ofdata at a time and use the IEEE 1284 standard. To connect a parallel device, such as a printer,a parallel cable must be used. A parallel cable, as shown in Figure 1-14, has a maximumlength of 15 feet (4.5 m).Figure 1-14Parallel Cable
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iiiTrademark AcknowledgmentsAll ter
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vAbout the Technical ReviewersDavid
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ixIdentify the Names, Purposes, and
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CHAPTER 7Fundamental Printers and S
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CHAPTER 13Advanced Laptops and Port
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CHAPTER 15Advanced NetworksObjectiv
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GlossaryThis glossary defines many
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ase station 3AppleTalk A protocol s
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CMOS battery 5bus topology A networ
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desktop computer 7crosstalk Interfe
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dynamic routing 9Domain Name System
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floppy data cable 11FFast Ethernet
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Regedit 23Printer Control Language
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