Dell OptiPlex 755 User's Guide - Page 379

Hyperthreading - hyperthreading is an Intel technology that can enhance overall computer performance by allowing one physical processor to function as two logical processors, capable of performing certain tasks simultaneously. Hz - hertz - A unit of frequency measurement that equals 1 cycle per second. Computers and electronic devices are often measured in kilohertz (kHz), megahertz (MHz), gigahertz (GHz), or terahertz (THz). I iAMT - Intel® Active Management Technology (Intel® AMT) Using built-in platform capabilities and popular third-party management and security applications, Intel AMT allows IT to better detect, repair, and protect their networked computing assets. IC - integrated circuit - A semiconductor wafer, or chip, on which thousands or millions of tiny electronic components are fabricated for use in computer, audio, and video equipment. IDE - integrated device electronics - An interface for mass storage devices in which the controller is integrated into the hard drive or CD drive. IEEE 1394 - Institute of Electrical and Electronics Engineers, Inc. - A high-performance serial bus used to connect IEEE 1394-compatible devices, such as digital cameras and DVD players, to the computer. infrared sensor - A port that allows you to transfer data between the computer and infrared-compatible devices without using a cable connection. integrated - Usually refers to components that are physically located on the computer's system board. Also referred to as built-in. I/O - input/output - An operation or device that enters and extracts data from your computer. Keyboards and printers are I/O devices. I/O address - An address in RAM that is associated with a specific device (such as a serial connector, parallel connector, or expansion slot) and allows the processor to communicate with that device. IrDA - Infrared Data Association - The organization that creates international standards for infrared communications. IRQ - interrupt request - An electronic pathway assigned to a specific device so that the device can communicate with the processor. Each device connection must be assigned an IRQ. Although two devices can share the same IRQ assignment, you cannot operate both devices simultaneously. ISP - Internet service provider - A company that allows you to access its host server to connect directly to the Internet, send and receive e-mail, and access websites. The ISP typically provides you with a software package, user name, and access phone numbers for a fee. K Kb - kilobit - A unit of data that equals 1024 bits. A measurement of the capacity of memory integrated circuits. KB - kilobyte - A unit of data that equals 1024 bytes but is often referred to as 1000 bytes. key combination - A command requiring you to press multiple keys at the same time. kHz - kilohertz - A measurement of frequency that equals 1000 Hz. L LAN - local area network - A computer network covering a small area. A LAN usually is confined to a building or a few nearby buildings. A LAN can be connected to another LAN over any distance through telephone lines and radio waves to form a wide area network (WAN). LCD - liquid crystal display - The technology used by portable computer and flat-panel displays. LED - light-emitting diode - An electronic component that emits light to indicate the status of the computer. local bus - A data bus that provides a fast throughput for devices to the processor. Glossary 379