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Word Explanation
Computer Cluster

A computer cluster is a group of computers that work together closely so that in many respects it can be viewed as though it were a single computer. Clusters are commonly (but not always) connected through fast local area networks. Clusters are usually deployed to improve speed and/or reliability over that provided by a single computer, while typically being much more cost-effective than single computers of comparable speed or reliability.

DIN Connector: Deutsche Industrie Norm C

Deutsche Industrie Norm connectors (DIN Connector) are 13.2 mm in diameter, and are available in patterns with three to fifteen pins. DIN Connector are used in some Macintosh and IBM PC-compatible computers, and on some network processor panels. For example, the keyboard connector for PCs is a DIN connector. DIN 41612 connectors are used widely to connect network equipment, such as routers and switches.

CNR: Communication and Networking Riser

Communication and Networking Riser (CNR), developed by Intel, is a riser card for ATX family motherboards. The CNR specification is open to the industry. It defines a scalable motherboard riser card and interface that support the audio, modem, and network interfaces of core logic chipsets.

DIB: Dual Independent Bus

DUAL INDEPENDENT BUS (DIB) architecture is introduced in the Intel's Pentium II to connect the processor, memory, and L2 cache. One bus connects the processor to L2 cache and a second connects the processor to main memory. Having two buses instead of one increases performance over single-bus architectures. In addition, the speed of the external L2 cache can scale up independently from the speed of the system bus.This allows for faster cache access. The final feature of the DIB architecture is a pipeline on the cache to the processor bus that allows multiple simultaneous cache requests.

Xirrus Wi-Fi Array

The Xirrus Wi-Fi Array architecture displaces both overlay Wi-Fi offerings and switched Ethernet to the desktop. The Wi-Fi Array integrates 4, 8, 12, 16 or 24 802.11abg+n radios coupled to a high-gain directional antenna system into a single device along with an onboard multi-gigabit switch, Wi-Fi controller, firewall, dedicated Wi-Fi threat sensor, and an embedded spectrum analyzer. The Wi-Fi Array provides more than enough bandwidth, security, and control to replace switched Ethernet to the desktop as the primary network connection. The Xirrus Wi-Fi Array delivers the most coverage, bandwidth, throughput, and user density than anything else available on the market today - resulting in a solution that uses 75% fewer devices, cabling, switch ports, power, space, and installation time compared with any other offering.

Xirrus XS4 Wi-Fi Array

802.11a/b/g Wi-Fi Array with 4 integrated Access Points, antennas, controller, switch, threat sensor, and firewall.

DB Connector: Database Bus connector

Database Bus connector (DB connector), defined by various EIA/TIA standards, is a type of connectors used to connect serial and parallel cables to a data bus. DB connector names are in the format of DB-x, where x represents the number of (wires) within the connector. Each line is connected to a pin on the connector, but in many cases, not all pins are assigned a function. DB connectors come in 9, 15, 25, 37 and 50-pin sizes. The DB connector defines the physical structure of the connector, not the purpose of each line. For example, DB-9 connectors have 9 pins and are used to connect a mouse. DB-25 connectors have 25 pins and are used to connect a printer.

DAC: Digital-to-Analog converter

Digital-to-Analog converter (DAC), also known as D/A converter, or D-to-A, is a device that convert a set of bits from a processor to an analog signal (current, voltage or charges) according to the digital input. D/A converters might be as simple as an array of resistors configured in the typical "R-2R" fashion or a hybrid module that generates very precise results with many bits of resolution. Simple switches, a network of resistors, current sources or capacitors may implement this conversion.

DDR Memory: Double Data Rate Memory

DDR memory, or Double Data Rate memory, is an evolutionary new memory technology that doubles data throughput to the processor. As an evolution of SDRAM, DDR memory leverages the existing production and environment to provide better PC performance at an affordable price. DDR memory is also known as DDR-SDRAM, or DDRAM.

Controller

Controller, in the context of computer, is a device that controls the transfer of data from a computer to a peripheral device and vice versa. Controllers are required on both the computer and the peripherial devices such as disk drives, display screens, keyboards, and printers.

CCD: Charge-Coupled device

Charge-coupled device (CCD) is a device whose semiconductors are connected so that the output of one serves as the input of the next. Digital cameras, video cameras, and optical scanners all use CCD arrays.

CAT5e: Category 5e

Category 5e (CAT5e) is an enhanced version of Category 5 (Cat5) cable, developed by TIA/EIA to improve certain cable characteristics important to Gigabit Ethernet operation, for example it adds specifications for far-end crosstalk. It is an excellent choice for use with 1000BASE-T.

DIVX: Digital Video Express

The term DivX is a registered trademark of the Company DivX, Inc. and is used in conjunction with video compression software, as well as the various PC, consumer electronic, and mobile devices that support the DivX® technology. Initially, the registered trademark DivX® was used to represent the Company's proprietary video codec, the latest versions of which are compliant with the MPEG-4 video standards. The Company has since gone on to use the registered trademark to represent its proprietary video format, which includes video streams (compressed using the DivX codecs), audio streams, DRM, metadata, and other features of video files. The Company licenses its technology to manufacturers of DVD players, mobile phones, set-top boxes, digital still cameras, and other consumer electronics devices to allow users to create and watch content in a superior format. DivX, Inc. also offers tools to enable secure distribution of digital content by retailers, and provides product certification services and software tools which allow videos to be streamed from the PC or the Internet to a user's devices. For more information on DivX technology and products, please visit www.divx.com, or see the Company's most recent annual report on file with the U.S. Securities and Exchange Commission, available at http://investors.divx.com/annuals.cfm.

CAS Latency or CL

Latency is the rate at which RAM responds to the MCC on the motherboard. The lower the rate, the better. CAS stands for Column Array Strobe and could be described as a contact that assists the Memory Controller Chip find a specific bit of memory. Has an impact on overall latency.

imac

The brand name of Apple''s Macintosh desktop computers aimed mainly at the consumer or home market. First launched in 1998, they are best known for their choice of fruity colours and their futuristic style. The brand name of the portable version is the iBook.\nwww.techwriter.co.nz/nerd-im.html\n\n\nA colourful and stylish computer by Applethat offers users features such as easy Internet access with a choice of browser, the ability to play MP3 files, QuickTime4 for digital video and streaming media, and in some models, a DVD player. Apple''s comparable notebook computer is the iBook.\nwww.scotsmist.co.uk/glossary_i.html

web 2.0

In alluding to the version-numbers that commonly designate software upgrades, the phrase "Web 2.0" may hint at an improved form of the World Wide Web. Advocates of the concept suggest that technologies such as weblogs, social bookmarking, wikis, podcasts, RSS feeds (and other forms of many-to-many publishing), social software, Web APIs, Web standards and online Web services imply a significant change in web usage. As used by its supporters, the phrase "Web 2.0" can also refer to one or more of the following:\n\n * the transition of web sites from isolated information silos to sources of content and functionality, thus becoming computing platforms serving web applications to end-users;\n * a social phenomenon embracing an approach to generating and distributing Web content itself, characterized by open communication, decentralization of authority, freedom to share and re-use, and "the market as a conversation";\n * enhanced organization and categorization of content, emphasizing deep linking;\n * a rise in the economic value of the Web, possibly surpassing the impact of the dot-com boom of the late 1990s.

ACCU: Association of C and C++ Users

Association of C and C++ Users (ACCU) is a worldwide association of people who are interested in C, C++, and related programming languages.

Fibonacci Number Program

Fibonacci number program is a popular program in many beginning computer science courses, introducing the concept of recursion by calculating and printing the Fibonacci numbers. In general, however, a recursive algorithm to compute Fibonacci numbers is extremely inefficient when compared to other algorithms, such as iterative or matrix equation algorithms.

2D Computer Graphics

2D computer graphics is the computer-based generation of digital images based on two-dimensional models. The word may stand for the branch of computer science that comprises such techniques, or for the models themselves. 2D computer graphics are mainly used in applications that were originally developed upon traditional printing and drawing technologies, such as typography, cartography, technical drawing, advertising, etc.

2GL: Second Generation Language

Second generation language (2GL), also known as second-generation programming language, usually refers to some form of assembly language. Unlike first-generation programming languages, the code can be read and written fairly easily by a human, but it must be converted into a machine readable form in order to run on a computer. The conversion process is simply a mapping of the assembly language code into binary machine code (the first-generation language). The language is specific to and dependent on a particular processor family and environment. Since it is the native language of a processor it has significant speed advantages, but it requires more programming efforts and is difficult to use effectively for large( or wide) applications.

PDP-10: Programmed Data Processor model

Programmed Data Processor model 10 (PDP-10) was a computer manufactured by Digital Equipment Corporation (DEC) from the late 1960s on. It was the machine that made time-sharing common; it looms large in hacker folklore because of its adoption in the 1970s by many university computing facilities and research labs, the most notable of which were MIT's AI Lab and Project MAC, Stanford's SAIL, and Carnegie Mellon University.

PDP-11: Programmed Data Processor model

Programmed Data Processor model 11 (PDP-11) was a series of 16-bit minicomputers sold by Digital Equipment Corp. in the 1970s and 1980s. The PDP-11 was a successor to DEC's PDP-8 computer in the PDP series of computers. It had several uniquely innovative features, and was easier to program than its predecessors. While well-liked by programmers, it was replaced in the mid-range minicomputer niche by the VAX-11 32-bit extension of the PDP-11. Much of the market for both machines would be taken by personal computers, including the IBM PC and Apple II, and workstations, such as those from Sun Microsystems.

Peripheral

Peripheral, or peripheral device, refers to all the I/O devices related with a computer. A peripheral can reside within the same chip as the processor; in which case, it can be called an integrated or on-chip peripheral. It can also be an external device outside the computer such as the keyboard, mouse, printer etc.

Peripheral Equipment

Peripheral Equipment refers to any input/output devices related to a comuputer. Examples of the peripheral equipment include mouse, keyboards and printers.

Personal Computer

Personal Computer(PC) is a computer designed for use by one person at a time. The term "PC" is also commonly used to describe an "IBM-compatible" personal computer in contrast to an Apple Macintosh computer. In price, personal computers range anywhere from a few hundred dollars to thousands of dollars. All are based on the microprocessor technology that enables manufacturers to put an entire CPU on one chip. Personal computers are used for word processing, accounting, desktop publishing, and for running spreadsheet and database management applications and play games.

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