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D

Word Explanation
d :-o

Hats off to you!

D-AMPS: Digital AMPS

Digital AMPS (D-AMPS), based on the IS-54 and IS-136 standards, is the second-generation (2G) mobile phone systems. It is used throughout the Americas, particularly in the United States and Canada. D-AMPS is considered end-of-life, and existing networks are in the process of being replaced by GSM/GPRS and CDMA2000 technologies.

D/A conversion

Digital to Analog conversion. The translation of digital information (1s and 0s) into analog information, such as sound waves.

D/A converter

Digital-to-Analog converter, also known as D/A converter, DAC 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.

D/L

Download. To receive a data transmission.

D1

Broadcast-quality digital video format that is "raw," or not compressed. Uses 1MB for each frame.

D2

Broadcast-quality digital video format that integrates with analog equipment.

D3

Broadcast-quality digital video format recorded on half-inch tape. Is a cheaper alternative to D1 recording.

D4

Framing format for T1 transmission. Places 12 T1 frames into a superframe.

D5

Broadcast-quality digital video format recorded on half-inch tape. Cheaper alternative to D1 recording.

DA

Desk Accessory. A small, useful program that is analogous to an item on a real office desktop, such as a clock, calculator, calendar, and message pad. Macintosh desktop accessories can be made easily available by putting them in the Apple menu. Windows desk accessories are in the Accessories group.

DAA: Data Access Arrangement

Data Access Arrangement(DAA) provides the analog circuits that electrically isolate the modem from the phone line, separating the modem from the telephone line higher voltage. The FCC requires this feature of any device that connects to the PSTN, including fax machines and set-top boxes, and most manufacturers build modems around an FCC-approved DAA design.

DAC

Digital to Analog Converter. An electronic circuit that converts digital information (for example, from a CD or CD-ROM) into analog information, such as sound and audio signals.

DAC: Digital to Analog Converter

Digital to Analog Converter (DAC) is a device that takes a digital representation of a signal and transforms it into a facsimile of its original form.

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.

DACS: Digital Access and Cross-connect S

Digital access and cross-connect system (DACS, DCS or DCCS) is a digital switching device in telecommunications for routing T1 lines. The DACS can cross-connect any T1 line in the system with any other T1 line also in the system. DACS is a simple form of channel switch which works at the DS0, DS1(T1/E1) and DS3(T3/E3), as well as STS-level.

DAD
  1. Database Action Diagram. Describes the processing of data in a database. 2. Digital Audio Disk, or compact disk (CD).
daemon

A UNIX program that runs continuously in the background, until it is activated by a particular event. This word is often used to refer to programs that handle e-mail. The word daemon is Greek for "an attendant power or spirit."

Daemon

In Unix and other computer multitasking operating systems, a daemon is a computer program that runs in the background, rather than under the direct control of a user; they are usually instantiated as processes. The Daemon program, often started at the time the system boots and runs continuously without intervention from any of the users on the system, forwards the requests to other programs (or processes) as appropriate. Typically daemons have names that end with the letter "d"; for example, syslogd is the daemon which handles the system log. Windows OS refers to daemons as System Agents and services.

DAF

Digital Anchor Data File

DAI

Distributed Artificial Intelligence.

daisy chain

A configuration in which devices are connected to each other in sequence, like a chain of daisies.

Daisy Wheel Printer

A daisy wheel printer is a type of computer printer that produces high-quality type, and is often referred to as a letter-quality printer (this in contrast to high-quality dot-matrix printers, capable of near-letter-quality (NLQ) output). To print a character, the printer rotates the disk until the desired letter is facing the paper. Then a hammer strikes the disk, forcing the character to hit an ink ribbon, leaving an impression of the character on the paper. You can change the daisy wheel to print different fonts. There were also, and still are daisy wheel typewriters, based on the same principle.

daisywheel printer

A impact printer that uses a rotating plastic wheel with the type characters on it. The wheel spins to line up the correct character to print. Daisywheel printers produced high-quality type, and were common in the 1980s but fell out of use when laser printers became affordable.

DAL

Data Access Language. An Apple database interface that enables Macintosh computers to access certain databases on other computers and platforms.

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