Technology terms starting with D

1,369 terms

disclaimer A patentee, whether of the whole or any sectional interest therein, may, on payment of the fee required by law, make disclaimer (give up all or part of…
disclosure A disclosure document explains how a financial product or offering works. It also details the terms to which you must agree in order to buy it or use it…
DISCO Defense Industrial Security Clearance Office
DISCOM Division Support Command (US Army term).
discone antenna See biconical antenna.
disconnect In telephony, the disassociation or release of a switched circuit between two stations.
disconnect command (DISC) In Link-Layer protocols, such as high-level data link control (HDLC), synchronous data link control (SDLC), and advanced data communication control…
disconnect signal In a switched telephone network, a supervisory signal transmitted from one end of a user line or trunk to indicate at the other end that the established…
disconnect switch In a power system, a switch used for closing, opening, or changing the connections in a circuit or system or for purposes of isolation.
disconnect timing The timing of the period during which a hang-up signal is being received from the called end office and an off-hook signal is being received from the…
disconnect-control office The switching entity that performs disconnect timing and that decides when the connection is to be cleared.
Disconnection The termination of an interconnection between two or more IT systems. A disconnection may be planned (e.g., due to changed business needs) or unplanned (i.
discoverer A function of a crawler that determines which data sources are available for the crawler to retrieve information from.
Discovery This is when the Court orders each party (each side) to give each other information about the facts before the trial, to avoid surprise.
discrete data Geographic features containing boundaries: point, line or area boundaries.
discrete simulation In a discrete simulation, time passes at an irregular rate that is determined by the primary events of interest in the simulation.
Discretionary Access Control The basis of this kind of security is that an individual user, or program operating on the users behalf is allowed to specify explicitly the types of…
discretionary access control (DAC) 1. [A] means of restricting access to objects based on the identity and need-to-know of users and/or groups to which the object belongs.
Discretionary Judgment The authority given USCINCSPACE or his duly authorized representative to perform actions not covered by the ROE.
DISCRIM Discrimination
discriminator The part of an FM receiver that extracts the desired signal from an incoming FM wave by changing frequency variations into amplitude variations.
discussion forums A place where AWS users can post technical questions and feedback to help accelerate their development efforts and to engage with the AWS community.
discussion group Synonym forum.
discussion list Synonym forum.
discussion server A computer that stores discussion text and information about the location of the file being discussed.
discussion thread In a discussion board or Web discussions, a series of messages or comments in which replies to a message or comment are nested directly under it, instead…
Discussions A feature for adding threaded remarks about a document.
disengagement attempt An attempt to terminate a telecommunications system access. Note: Disengagement attempts may be initiated by a user or the telecommunications system.
disengagement denial After a disengagement attempt, a failure to terminate the telecommunications system access.
disengagement failure Failure of a disengagement attempt to return a communication system to the idle state, for a given user, within a specified maximum disengagement time.
disengagement originator The user or functional unit that initiates a disengagement attempt. Note 1: A disengagement originator may be the originating user, the destination user…
disengagement phase In an information transfer transaction, the phase during which successful disengagement occurs.
disengagement request A control or overhead signal issued by a disengagement originator for the purpose of initiating a disengagement attempt.
disengagement time The average value of elapsed time between the start of a disengagement attempt for a particular source or destination user and the successful…
disengagement-denial probability The ratio of disengagement attempts that result in disengagement denial to the total disengagement attempts counted during a measurement period.
disjoint namespace A domain namespace in which at least some of the computers do not use the Active Directory domain name as their primary Domain Name System (DNS) suffix.
disk The visible surface of the sun (or any heavenly body) projected against the sky.
disk and execution monitor (daemon) See daemon.
disk block number (DBN) A number that identifies a block of data on a disk.
disk drive A hardware device used to store data. They come in many forms, such as compact disks, floppy disks and hard disks.
disk ID number A number assigned by the NetApp appliance to each disk when it probes the disks at boot-up, for example, 8.1.
disk pack An assembly of magnetic disks that can be removed as a whole from a disk drive together with a container from which the assembly must be separated when…
disk scrubbing The process by which the system reads each disk in a RAID group and attempts to fix media errors by rewriting the data to another disk area.
disk shelf A storage unit that contains disk drives.
diskette An inexpensive, low-capacity storage medium, usually measuring 3.5 inches in diameter, often referred to as a floppy disk.
DISN Defense Information System Network (DISA term).
disparity In pulse-code modulation (PCM), the digital sum, i.e., the algebraic sum, of a set of signal elements.
dispatch To send something to its correct destination. Often used metaphorically to indicate a transfer of programmatic control to a destination selected…
dispersal transfer of duplicate copies of vital records to locations beyond those where the originals are housed See also built-in dispersal and mirror site.
Dispersion Distortion of the shape of a seismic-wave train because of variation of velocity with frequency.
dispersion coefficient See material dispersion coefficient.
dispersion-limited operation Operation of a communications link in which signal waveform degradation attributable to the dispersive effects of the communications medium is the…
dispersion-shifted fiber A single-mode optical fiber that has its minimum-dispersion wavelength shifted, by the addition of dopants, toward its minimum-loss wavelength.
dispersion-unmodified fiber Synonym dispersion-unshifted fiber.
dispersion-unshifted fiber A single-mode optical fiber that has a nominal zero-dispersion wavelength in the 1.3-m transmission window.
display device An output unit that gives a visual representation of data.
display name A descriptive name that is assigned to a directory object when it is created. The display name is predominantly used in user interfaces such as client…
Disposal A term used in some countries, including the U.S., to mean that an application has been abandoned, denied (rejected) or allowed (granted).
disposal authority The legal authorization for the disposal of records granted by the Department of General Services.
disposal list A document providing one-time authorization for the legal destruction of specified nonrecurring series.
disposal period The length of time, based on an event or a chronological period, during which a series is retained before its authorized disposal.
dispose To carry out disposition instructions to destroy or donate temporary records after their retention period expires or other documentary material without…
disposition The court's final determination of a lawsuit, the outcome of the case.
disposition agreement A general term that includes all types of agreements (records schedules, deeds of gift, deposit agreements) that contain disposition instructions.
disposition instruction The instructions contained in a disposition agreement that mandate what is to be done with documentary material at certain points in their lifecycle.
disposition period The time period scheduled for the cutoff, transfer to a records center, destruction or transfer to the State Archives. See also retention period.
disposition schedule retention schedule.
Disruption An unplanned event that causes the general system or major application to be inoperable for an unacceptable length of time (e.g.
dissolve To enter into a solution.
DISSP Defense-wide Information Systems Security Program.
Distance Learning Synonym teletraining.
distance measuring equipment (DME) In radio location systems, equipment that ascertains the distance between an interrogator and a transponder. [From Weik '89]
distance training Synonym teletraining.
distance-decay function In spatial interaction, the mathematical representation of the effect of distance on the accessibility and number of interactions between locations.
distinctive alerting Special ringing or call-waiting tone patterns sent by the network to convey information to a customer installation (CI) about the called number, the…
distinguished folder A folder in a mailbox that can be referenced by Web services requests to identify a folder by name.
distinguished name A name that uniquely identifies an object by using the relative distinguished name for the object, plus the names of container objects and domains that…
Distinguished Name Tag (DNT) An integer column that is maintained by the Extensible Storage Engine (ESE). Domain controllers use DNTs when they create objects, either locally or…
Distinguishing Identifier Information which unambiguously distinguishes an entity in the authentication process.
distortion In a system or device, any departure of the output signal waveform from that which should result from the input signal waveform's being operated on by the…
distortion-limited operation The condition prevailing when distortion of a received signal, rather than its attenuated amplitude (or power), limits performance under stated…
distributed Running in more than one address space.
distributed application An application made up of distinct components running in separate runtime environments, usually on different platforms connected via a network.
Distributed Authoring and Versioning (DAV) An extension to the HTTP protocol, DAV enables a client to perform file-system type operations on a remote server, opening the door for creating Web-based…
Distributed Authoring Search and Location (DASL) Defines the SEARCH operation implemented in DAV. The body of the SEARCH method contains the request or criteria for the search.
distributed cache A Hadoop feature that allow you to transfer files from a distributed file system to the local file system.
distributed computing environment See DCE.
distributed control Control of a network from multiple points. Note: Each point controls a portion of the network, using local information or information transmitted over the…
distributed database 1. A database that is not entirely stored at a single physical location, but rather is dispersed over a network of interconnected computers. 2.
Distributed Denial of Service (DDoS) A Denial of Service technique that uses numerous hosts to perform the attack.
distributed directory architecture Directory architecture in a Domino domain in which all servers use a local primary Domino Directory.
Distributed File System (DFS) A Windows file management system that allows data scattered across multiple servers to be treated as a single group.
distributed frame-alignment signal A frame-alignment signal in which the signal elements occupy digit positions that are not consecutive.
distributed network A network structure in which the network resources, such as switching equipment and processors, are distributed throughout the geographical area being…
distributed processing Data processing in which an integrated set of functions is performed within multiple, physically separated devices.
distributed switching Switching in which many processor-controlled switching units are distributed, usually close to concentrations of users, and operated in conjunction with a…
distributed-queue dual-bus (DQDB) [network] A distributed multi-access network that (a) supports integrated communications using a dual bus and distributed queuing, (b) provides access to local or…
Distribution The sale of securities. Also refers to a sum payable to shareholders representing their share of profits.
distribution amplifier An active linear device that accepts, at its input port, one signal source (e.g.
distribution frame In communications, a structure with terminations for connecting the permanent wiring of a facility in such a manner that interconnection by…