182 GlossaryIRQ — Interrupt request. A signal that data is about to be sent to or received by aperipheral device travels by an IRQ line to the processor. Each peripheral connectionmust be assigned an IRQ number. Two devices can share the same IRQ assignment,but you cannot operate both devices simultaneously.iSCSI — Internet SCSI (see SCSI). A protocol that enables SCSI devicecommunication across a network or the Internet.jumper — Small blocks on a circuit board with two or more pins emerging from them.Plastic plugs containing a wire fit down over the pins. The wire connects the pins andcreates a circuit, providing a simple and reversible method of changing the circuitry ina board.K — Kilo-; 1000.Kb — Kilobit(s); 1024 bits.KB — Kilobyte(s); 1024 bytes.Kbps — Kilobit(s) per second.KBps — Kilobyte(s) per second.kg — Kilogram(s); 1000 grams.kHz — Kilohertz.KVM — Keyboard/video/mouse. KVM refers to a switch that allows selection of thesystem from which the video is displayed and for which the keyboard and mouse areused.LAN — Local area network. A LAN is usually confined to the same building or a fewnearby buildings, with all equipment linked by wiring dedicated specifically to theLAN.LCD — Liquid crystal display.LED — Light-emitting diode. An electronic device that lights up when a current ispassed through it.LGA — Land grid array.local bus — On a system with local-bus expansion capability, certain peripheraldevices (such as the video adapter circuitry) can be designed to run much faster thanthey would with a traditional expansion bus. See also bus.LOM — LAN on motherboard.LVD — Low voltage differential.m — Meter(s).mA — Milliampere(s).
