Technology — page 142 of 206

20,531 terms including subtopics (0 terms filed directly here)

Technology terms

preassignment access plan In satellite communications system operations, a fixed communication channel access plan, as opposed to a demand assignment access plan in which…
precedence 1. A designator, which indicates the order in which a number of messages shall be served.
precedence rules The rules that determine the order of evaluation of an expression involving more than one operator.
Precinct See County Election Precinct and Election Day precinct.
Precipitation Attenuation The loss of energy that radar beam experiences as it passes through an area of precipitation.
precipitation static (p-static) Radio interference caused by the impact of charged particles against an antenna.
precise frequency A frequency that is maintained to the known accuracy of an accepted reference frequency standard.
precise time A time mark that is accurately known with respect to an accepted reference time standard.
precise time and time interval (PTTI) The discipline that addresses precise timekeeping and time information transfer.
Precision The accuracy with which a number can be represented, i.e., the number of digits used to represent a number.
Precision and Recall Precision is the ability to retrieve the most precise results. Higher precision means better relevance and more precise results, but may imply fewer…
Precision Decoys Decoys that precisely match RV characteristics either exoatmospherically or endoatmospherically , or both, and seek to deceive the defense into…
precision-sleeve splicing Optical fiber splicing that uses a capillary tube, of suitable material, to align the mating fibers.
precombining The combining of multiplexed signals prior to the modulation of the carrier. [From Weik '89] Synonym premodulation combining.
Preconditions for Defense (PD) PDs are NCA pre-approved criteria, authorities, and procedures that delineate circumstances under which USCINCSPACE BMD forces will initiate or continue…
Precursor A sign that an attacker may be preparing to cause an incident.
predesignation An exchange carrier (EC) service that is provided by suitably equipped end-office switching systems, and by means of which are provided carrier…
predetection Referring to that portion of the circuitry of a receiver which, with respect to the signal being processed, is chronologically prior to the detection.
predetection combining Synonym maximal-ratio combiner.
predicate In Exchange Server 2007, a function that is used as a condition or exception on a transport rule to determine whether an action should be applied to an…
Predicted Intercept Point (PIP) The calculated position in space where the target and interceptor coincide.
preemphasis A system process designed to increase, within a band of frequencies, the magnitude of some (usually higher) frequencies with respect to the magnitude of…
preemphasis improvement In FM broadcasting, the improvement in the signal-to-noise ratio of the high-frequency portion of the baseband, i.e.
preemphasis network A network inserted in a system in order to increase the magnitude of one range of frequencies with respect to another.
preempt The currently executing thread may be preempted, or forced to yield control, by a higher priority thread that becomes eligible to run during its timeslice.
preempting call See multilevel precedence and preemption.
preemption The seizure, usually automatic, of military system facilities that are being used to serve a lower precedence call in order to serve immediately a higher…
preemption tone In military telephone systems, a distinctive tone that is used to indicate to connected users, i.e.
preemptive multitasking the execution of more than one program at a time on the same CPU with time-sharing strictly controlled by a scheduler.
Preference Priority access to Federal power by public bodies and cooperatives.
Preferential Defense Preferential defense is the a-priori assignment of defensive assets to protect given facilities or capabilities.
Preferential Defense Strategy A tactic used as part of the SDS strategy to optimize the use of weapons and sensors by selecting high value targets for engagement by the defense while…
Preferential Offense The concentration of offensive assets on a subset of targets.
prefetch The process of retrieving and caching data before it is requested by the client.
prefix An "operator" that precedes its "operand", as in ++$x.
prefix-free code Synonym comma-free code.
pregroup combining In communications systems, assembling a number of narrowband channels, such as 4-kHz-wide telephone channels, into a specified frequency band such that…
pregroup translation In communications systems, the process of transposing, in frequency, a pregroup of channels, such as telephone or data channels, in such a manner that…
preliminary call In radio transmission, a call that (a) includes at least the identification of the calling station and the called station, (b) is designed to establish…
Preliminary Design Review (PDR) A review conducted on each configuration item to evaluate the progress, technical adequacy, and risk resolution of the selected design approach; to…
preliminary topology Refers to incomplete region topology. Region topology defines region-arc and region-polygon relationships.
premature disconnect The termination of an established connection, where the termination is not initiated by either of the connected end-users. [Tl-507-1996]
premature disconnect stimulus The untimely occurrence of an event or a combination of events that, according to the protocol, should result in a disconnection.
premises wiring See on-premises wiring.
Premium Support A one-on-one, fast-response support channel that AWS customers can subscribe to for support for AWS infrastructure services.
premodulation combining Synonym precombining.
Preplanned Product Improvement (P 3 I) Planned future evolutionary improvement of developmental systems for which design considerations are effected during development to enhance future…
Preplanned Response Options (PRO) Ballistic Missile Defense (BMD) reactions, which have been preplanned, analyzed, and pre-approved, for specific ballistic missile threats.
preprocessing What some helper "process" did to transform the incoming data into a form more suitable for the current process. Often done with an incoming "pipe".
Preproduction Prototype An article in final form employing standard parts, representative of articles to be produced subsequently in a production line.
Preproduction Test This is a test of design-qualified hardware that is produced using production tooling and processes, which will be used to produce the operational…
Prescribed Interexchange Charge (PICC) The charge the local exchange company assesses the long distance company when a consumer picks it as his or her long distance carrier.
presence noise In telephony, a low-level artificial noise introduced into the receiver to indicate that the connection is still in effect, even though no voice sound is…
presentation context An association of an abstract syntax with a transfer syntax. [T1.208-1989]
Presentation Layer See Open Systems Interconnection--Reference Model.
presentation unit The smallest convenient division of a media stream (defined by the measurement system) that conveys an independent, self-contained unit of content, from…
preservation The process of ensuring retention and protection from destruction or deletion all potentially relevant evidence, including electronic metadata.
preservation and access level (pal) The related services for preservation and access to a set of electronic records maintained in the ERA system.
preservation and access plan A plan, based on the results of a preservation assessment, indicating the activities to be undertaken in preserving specific documentary material or sets…
preservation assessment 1) The review of documentary material to determine their current condition and potential need for preservation processing. 2) The results of this review.
preservation copy A copy of documentary material used solely in the processes and operations involved in the stabilization and protection of documentary material against…
preservation order See legal hold.
preservation process A process appropriate for ensuring the continued existence, accessibility, and authenticity of documentary material over time.
preset conference A service feature that permits the automatic connection of a fixed group of users, or a closed user group with outgoing access, by keying a single…
Preset Guidance A technique of missile control wherein a predetermined flight plan is set into the control mechanism and cannot be adjusted after launching.
preset jammer A jammer in which the frequency of the jamming transmitter is fixed before the transmitter is placed in operation.
President's Budget (PB) The Federal Government's budget for a particular fiscal year transmitted in January (first Monday after January 3rd) to the Congress by the President in…
press-to-talk operation Synonym push-to-talk operation.
press-to-type operation Synonym push-to-type operation.
preventive maintenance (PM) The care and servicing by personnel for the purpose of maintaining equipment and facilities in satisfactory operating condition by providing for…
preverification Due to memory and processing power available on a device, the verification process of classes are split into two processes.
preview pane A pane that lets users read the content of the document that is selected in the view pane.
PRF Pulse Repetition Frequency.
PRG Program Review Group.
PRI Abbreviation for primary rate interface.
primary channel The channel that is designated as a prime transmission channel and is used as the first choice in restoring priority circuits. 2.
primary coating The plastic overcoat in intimate contact with the cladding of an optical fiber, applied during the manufacturing process.
primary colors Any group of two or more (three, in most applications) discrete colors (optical wavelengths) that are (a) of relatively narrow spectral width, and (b)…
primary distribution system A system of alternating current distribution for supplying the primaries of distribution transformers from the generating station or substation…
primary DNS suffix The Domain Name System (DNS) suffix that a computer uses to identify the DNS domain to which it belongs.
Primary Domain Controller Emulator (PDC) PDC provides backward compatibility to Windows NT. In native forest, manages password changes and synchronizes time between DCs.
primary frequency A frequency that is assigned for usual use on a particular circuit. 2. The first-choice frequency that is assigned to a fixed or mobile station for…
primary frequency standard A frequency source that meets national standards for accuracy and operates without the need for calibration against an external standard.
primary group See group.
primary interexchange carrier (PIC) A carrier chosen by a subscriber to be accessible via simplified dialing pattern. [T1.246-1998/99]
primary key One or more attributes whose values uniquely identify a row in a database table. See also foreign key.
primary package The package that normally runs on the cluster in a production environment.
primary partition A type of partition created on basic disks that can host an operating system and functions as though it were a physically separate disk.
primary point code (PPC) The point code identification of the primary destination of the signaling connection control plan (SCCP) routing verification test (SRVT) message. [T1.
primary polymer coating Synonym primary coating.
primary polymer overcoat Synonym primary coating.
primary power The source of electrical power that usually supplies the station main bus. Note 1: The primary power source may be a Government-owned generating plant or…
primary protector A protective device placed on telecommunications conductors in accordance with ANSI/NFPA 70. [T1.321-1995]
primary radar A radiodetermination system based on the comparison of reference signals with radio signals reflected from the position to be determined. [NTIA] [RR]
primary radiation Radiation that is incident upon a material and produces secondary emission from the material.
primary rate access (PRA) path The logical connection between extended superframe termination points (i.e., path terminations) on the customer access (CA) and the customer installation…
primary rate interface (PRI) An integrated services digital network (ISDN) interface standard (a) that is designated in North America as having a 23B+D channels, (b) in which all…
primary reference source Equipment that provides a timing signal whose long-term accuracy is maintained at 1 x 10-11 or better with verification to Coordinated Universal Time…
primary replica The replica designated to be the only recipient of updates by the Administration Process.
primary route The predetermined path of a message from its source, i.e., sending or originating station, to a message sink, i.e.