High Definition Multimedia Interface HDMI

A video, plasma, LCD, or DLP projector.

HKEY_ The designation at the beginning of Windows Registry boot filenames.

host A computer system on a network. Similar to the term node, except that host usually implies a computer system. Node generally applies to any networked system, including access servers and routers.

hot-swappable interface Allows peripherals to be changed while the system is running. USB is an example.

hub 1) Generally, a term used to describe a Layer 1 device at the center of a star topology network. 2) A hardware or software device that contains multiple independent but connected modules of network and internetwork equipment. Hubs can be active (where they repeat signals sent through them) or passive (where they do not repeat, but merely split, signals sent through them). 3) In Ethernet and IEEE 802.3, an Ethernet multiport repeater, sometimes called a concentrator.

Hypertext Markup Language (HTML) A page-description language used by browser applications such as Windows Internet Explorer and Mozilla Firefox.

Hypertext Transfer Protocol (HTTP) Governs how files are exchanged on the Internet.

icon An image that represents an application or a capability.

IEEE 802.1 An IEEE specification that describes an algorithm that prevents bridging loops by creating a spanning tree. This algorithm was invented by Digital Equipment Corporation. The Digital algorithm and the IEEE 802.1 algorithm are not exactly the same, nor are they compatible.

IEEE 802.11 An IEEE standard that specifies carrier sense media access control and physical layer specifications for 1- and 2-Mbps wireless LANs.

IEEE 802.11a An IEEE standard for wireless LANs that operates in the 5-GHz band. Uses 52-sub-carrier orthogonal frequency-division multiplexing (OFDM) with a maximum raw data rate of 54 Mbps.

IEEE 802.11b The first widely accepted wireless networking standard. Because it operates in the 2.4GHz band, other devices that operate in the same band can cause interference.

IEEE 802.llg An extension of the 802.11 standard. 802.11g applies to wireless LANs and provides up to 54 Mbps. Because it operates in the 2.4-GHz band, other devices that operate in the same band can cause interference.

IEEE 802.11n A proposed new extension to the 802.11 standard. 802.11n applies to wireless LANs and provides up to 540 Mbps in the 2.4- or 5-GHz band.

IEEE 802.12 An IEEE LAN standard that specifies the physical layer and the MAC sublayer of the data link layer. IEEE 802.12 uses the demand priority media access scheme at 100 Mbps over a variety of physical media.

IEEE 802.2 An IEEE LAN protocol that specifies an implementation of the LLC sublayer of the data link layer. IEEE 802.2 handles errors, framing, flow control, and the network layer (Layer 3) service interface. Used in IEEE 802.3 and IEEE 802.5 LANs.

IEEE 802.3 An IEEE LAN protocol that specifies an implementation of the physical layer and the MAC sublayer of the data link layer. IEEE 802.3 uses CSMA/CD access at a variety of speeds over a variety of physical media. Extensions to the IEEE 802.3 standard specify implementations for Fast Ethernet. Physical variations on the original IEEE 802.3 specification include 10BASE2, 10BASE5,

10BASE-F, 10BASE-T, and 10Broad36. Physical variations for Fast Ethernet include 100BASE-T, 100BASE-T4, and 100BASE-X.

IEEE 802.3i A physical variation on the original IEEE 802.3 specification that calls for using Ethernet-type signaling over twisted-pair networking media. The standard sets the signaling speed at 10 Mbps using a baseband signaling scheme transmitted over twisted-pair cable employing a star or extended star topology.

IEEE 802.4 An IEEE LAN protocol that specifies an implementation of the physical layer and the MAC sublayer of the data link layer. IEEE 802.4 uses token-passing access over a bus topology and is based on the token bus LAN architecture.

IEEE 802.5 An IEEE LAN protocol that specifies an implementation of the physical layer and MAC sublayer of the data link layer. IEEE 802.5 uses token passing access at 4 or 16 Mbps over shielded twisted-pair (STP) cabling and is similar to IBM Token Ring.

IEEE 802.6 An IEEE MAN specification based on Distributed Queue Dual Bus (DQDB) technology. IEEE 802.6 supports data rates of 1.5 to 155 Mbps.

impact printer A class of printer that includes dot matrix and daisy wheel.

incremental backup A procedure to back up all the files and folders that have been created or modified since the last full or normal backup.

infrared (IR) Electromagnetic waves whose frequency range is above that of microwaves but below that of the visible spectrum. LAN systems based on this technology represent an emerging technology.

infrared port A line-of-sight wireless transceiver that is used for data transmission.

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infrared scatter An infrared signal that is bounced off ceilings and walls. Devices can connect without line of sight, but data transfer rates are lower, and distances are shorter.

inkjet printer A type of printer that uses liquid-ink-filled cartridges that spray ink to form an image on the paper.

input/output (I/O) Any operation, program, or device that transfers data to or from a computer.

input/output (I/O) address A unique hexadecimal memory address that is associated with a specific device on a computer.

installation CD A compact disc that includes new software with drivers and manuals. Additionally, may include diagnostic tools and trial software.

instant messaging (IM) A real-time text-based method of communication conducted over a network between two or more users.

Institute of Electrical and Electronics Engineers (IEEE) An organization that oversees the development of communication and network standards.

insulation A high-resistance material that inhibits the flow of current between conductors in a cable.

Integrated Services Digital Network (ISDN) A communication protocol, offered by telephone companies, that permits telephone networks to carry data, voice, and other source traffic.

interface 1) A connection between two systems or devices. 2) In routing terminology, a network connection. 3) In telephony, a shared boundary defined by common physical interconnection characteristics, signal characteristics, and meanings of interchanged signals. 4) The boundary between adjacent layers of the OSI reference model.

Interior Gateway Protocol (IGP) An Internet protocol that is used to exchange routing information within an autonomous system. Examples of common Internet IGPs include EIGRP, OSPF, and RIP.

International Electrotechnical Commission (IEC)

An industry group that writes and distributes standards for electrical products and components.

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