| 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.
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| 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.
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| 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.
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| 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.
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| 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.
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| Dark Fiber |
Dark fiber refers to unused fiber-optic cable that have been laid out in the field. Often times companies lay more lines than what's needed in order to curb costs of having to do it again and again. The dark strands can be leased to others who want to establish optical connections among their own locations.
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| DAS: Direct Attached Storage |
Direct Attached Storage (DAS) is a storage device directly attached to a host system, such as the internal hard drive of a server computer. DAS is still, by far, the most common method of storing data for computer systems.
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| Data Cartridge |
A data cartridge is used to hold computer data. There are many designs and manufactures for data cartridges. For example, 4mm data tape cartridge is one of the design for data back up.
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| Data Processing |
Data processing is a computer process that converts data into required information. The processing is usually assumed to be automated and running on an a computer. There are many data processing applications, such as accounting programs that converts raw financial data into meaninful reports for various purpose. Another example is customer relationship management systems (CRM) and employee relationship data systems.
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| Data Projector |
Data projector is a device that projects whatever is on the computer's display onto a big screen.
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| Database Server |
A database server is a computer program that provides database services to other computer programs or computers, as defined by the client-server model. The term may also refer to a computer dedicated to running such a program. Database management systems frequently provide database server functionality, and some DBMS's (e.g., MySQL) rely exclusively on the client-server model for database access.
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| DAW: Digital Audio Workstation |
Digital Audio Workstation (DAW) is a system designed to record, edit, and play back digital audio. A key feature of DAWs is the ability to freely manipulate recorded sounds, much like a word processor manipulates typed words. DAW generally refers to a combination of audio multitrack software and high-quality audio hardware — the latter being a specialized audio converter unit which performs some variety of both analog to digital (ADC) and digital to analog (DAC) converters. For example, a digital 8-track system could have eight discrete inputs, and a certain number of outputs — perhaps only stereo output for playback and monitoring.
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| 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.
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| DDB: Device Dependent Bitmap |
Device Dependent Bitmap (DDB) is the format which is used to display bitmaps on the screen. When used in 256 colors display mode, the one-byte pixel values point to entries in the currently realized system palette.
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| DDC: Digital Down Converter |
Digital down-converter (DDC), a key component for digital radio and 3g communications, performs the critical frequency translation needed to recover the information from a digitized modulated signal. DDC is typically used in wireless and wireline communication systems to perform channel access functions in all-digital receivers. See also Digital Up Converter (DUC).
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| DDC: Display Data Channel |
Display Data Channel (DDC) is a digital connection between a computer display and a graphics adapter that allows the display to communicate its specifications to the adapter. The standard was created by VESA. Using DDC, a monitor can inform the video card about its properties, such as maximum resolution and color depth. The video card can then use this information to ensure that the user is presented with valid options for configuring the display.
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| 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.
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| DDR-2: Double Data Rate Two |
Double Data Rate Two (DDR-2), also known as Double Data Rate Two Synchronous Dynamic Random Access Memory(DDR2 SDRAM), is a computer memory technology that, as of 2005, is becoming the mainstream standard for personal computer memory. DDR2 is part of the SDRAM family of random access memory technologies, which is itself one of many DRAM implementations. The advantage of DDR-2 over DDR SDRAM is its ability to run at much higher clock speeds due to an improved electrical interface.
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| DDR-SDRAM: Double Data Rate-Synchronous |
Double Data Rate-Synchronous DRAM (DDR-SDRAM), also known as SDRAM II, is an enhanced type of SDRAM that supports data transfers on both edges of each clock cycle, effectively doubling the memory chip's data throughput. DDR-SDRAM also consumes less power, which makes it well-suited to notebook computers.
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| DDR2-SDRAM: Double Data Rate 2 Synchrono |
Double Data Rate 2 Synchronous Dynamic Random Access Memory(DDR2-SDRAM), also known as DDR-2, is the improved version of DDR-SDRAM. DDR2-SDRAM offers greater bandwidth and density in a smaller package along with a reduction in power consumption. In addition DDR2-SDRAM offers new features and functions that enable higher a clock rate and data rate operations. DDR2 transfers 64 bits of data twice every clock cycle. DDR2-SDRAM memory is not compatible with current DDR-SDRAM memory slots.
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| DDR:Double Date Rate |
Double Date Rate (DDR) memory, also known as DDR-SDRAM,is an enhanced type of SDRAM that supports data transfers on both edges of each clock cycle, effectively doubling the memory chip's data throughput. DDR-SDRAM also consumes less power, which makes it well-suited to notebook computers.
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| DDRAM: Double Data rate Random Access Me |
Double Data rate Random Access Memory(DDRAM), also known as DDR-SDRAM, reads data on both the rising and falling edge of the clock, achieving a faster data rate. Often used in notebook computers because it also consumes less power.
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| Dead Pixel |
A pixel on an LCD monitor that can not be lighted or activated. It occurs because the transistor that activates the amount of light malfunctions and results in a permanently black pixel.
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| Decoder |
Decoder is a hardware device or a software program that translates a coded signal back to its original form. Decoders are used in many different ways such as to enable a computer to recognize instructions and addresses, or help programers to troubleshoot network applications.
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| Demarcation Point |
Demarcation Point, also known as point of demarcation (POD), is the network point or joint at which the public network of a telecommunications company ends and the private network of a customer begins.
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