Technology — page 136 of 206

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

Technology terms

PCO Procurement Contracting Officer (FAR term).
PCR A laboratory method used to make many copies of a specific DNA sequence. Also called polymerase chain reaction.
PCS (1) Permanent Change of Station (ILS term). (2) Planning and Control System.
PCS (Personal Communications Service) Personal Communications Service (PCS) is a suite of second-generation, digitally modulated mobile-communications interfaces that includes TDMA, CDMA, and…
PCS application From a user-identity-module (UIM) perspective, the files, commands and data used to support PCS services. [T1.707-1998]
PCS number A number that uniquely identifies a PCS user and is used to place or forward a call to that user. [T1.244-1995] Synonyms personal number, UPT number.
PCS session That part of the card session dedicated to the PCS operation. [T1.707-1998]
PCS switching center In personal communications service, a facility that (a) supports access-independent call control/service control, and connection control (switching)…
PCS System In personal communications service, a collection of facilities that provides some combination of personal mobility, terminal mobility, and service profile…
PCWBS Preliminary Control Work Breakdown Structure. 221
PD Period
PD-V Program Definition-Validation [Phase] (Acquisition Phase term).
PD/RR Program Design and Risk Reduction (Acquisition Phase term).
PDAP (Personal Digital Assistant Profile) The Personal Digital Assistant Profile (PDAP) is a Java ME profile specification designed for small platforms such as PalmOS devices.
PDB Post Deployment Build (PATRIOT).
PDC Plume Data Center, AEDC, TN.
PDC (Personal Digital Cellular) Personal Digital Cellular (PDC) is a Japanese standard for wireless communications.
PDCP (Parallel and Distributed Computing Practices) Parallel and Distributed Computing Practices (PDCP) are often used to describe computer systems that are spread over many devices on a network (wired or…
PDD (1) Point Defense Demonstration (USN term). (2) Presidential Decision Directive.
PDF Portable Document Format - a file format developed by Adobe Systems. PDF captures formatting information from a variety of desktop publishing…
PDH Acronym for plesiochronous digital hierarchy. PDH refers to the DS1/DS2/DS3 family of signals which were developed as an asynchronously multiplexed…
PDL Programmatic Design/ Development Language, e.g., Ada.
PDL (personal distribution list) A distribution list that a user creates and adds to their Personal Address Book (PDL) A distribution list is a name assigned to a group of recipients.
PDM Program Decision Memorandum (DD 5000 term).
PDM (I or II) See Program Decision Memorandum (First or Second).
PDN Abbreviation for public data network.
PDP Pulse Doppler Processor.
PDR Preliminary Design Review.
PDRR (1) Program Description, Requirements Review [phase] (DD 5000.1/2). (2) Program Definition (Development) and Risk Reduction.
PDS Particularly Dangerous Situation (PDS) wording is used in rare situations when long-lived, strong and violent tornadoes are possible.
PDSL Process Data Sensitivity Label.
PDSS Post-Development Software Support (ILS term).
PDU Abbreviation for protocol data unit.
PDUSD Principal Deputy Under Secretary of Defense.
PDUSD (A&T) Principal Deputy Under Secretary of Defense (Acquisition and Technology).
PDV Program Definition and Validation.
PE Program Element.
Peacekeeper US MX Missile.
peak A point around which all slopes are negative (i.e., downward).
peak busy hour Synonym busy hour.
peak emission wavelength Of an optical emitter, the spectral line having the greatest power. Synonym peak wavelength.
peak envelope power (of a radio transmitter) [PEP, pX, PX] The average power supplied to the antenna transmission line by a transmitter during one radio frequency cycle at the crest of the modulation envelope…
Peak Gamma Dose Rate The maximum rate (per second) of gamma radiation that the system could survive and continue functioning.
peak limiting A process by which the absolute instantaneous value of a signal parameter is prevented from exceeding a specified value.
peak power output The output power averaged over that cycle of an electromagnetic wave having the maximum peak value that can occur during transmission.
peak signal level In a transmission path, the maximum instantaneous signal power, voltage, or current at any point. 2.
peak spectral emission See peak emission wavelength.
peak wavelength Synonym peak emission wavelength. 2. Of an optical bandpass filter, the wavelength that suffers the lowest loss. [After FAA]
peak-to-average ratio (p/a r) The ratio of the instantaneous peak value, i.e., maximum magnitude, of a signal parameter to its time-averaged value.
peak-to-peak value The absolute value of the difference between the maximum and the minimum magnitudes of a varying quantity.
PEC (1) Program Element Code. (2) Pre-authorized Engagement Criteria.
pedestal 1.Black level expressed as an offset in voltage or IRE units relative to blanking level. Conventionally, approximately 54 mV (7.
PEELS Parametric Endo- Exo Lethality Simulation.
peer an individual having expertise in a specific functional area or discipline gained through documented training and experience.
peer entity In layered systems, entities in the same layer but in different systems (nodes) that must exchange information to achieve a common objective. [After T1.
peer group In Open Systems Interconnection (OSI)--Architecture, a group of functional units in a given layer of a network in which all the functions performed by the…
peer protocol A formal language used by peer entities to exchange user data. [TI.110-1987].
peer-entity authentication 1. The corroboration that a peer entity in an association is the one claimed. [T1.233-1993] 2.
peg count 1. In communication systems, a count that is made of the number of times that an event or condition occurs. [From Weik '89] 2.
PEIP Programmable Embedded INFOSEC Product (ex-MSD).
PEIS Programmatic Environmental Impact Statement. 222
pel In a facsimile system, the smallest discrete scanning line sample containing only monochrome information, i.e., not containing gray-scale information.
Pellet Open-source Java OWL DL reasoner.
PEM Program Element Monitor (AF).
PENAID Penetration Aid.
Penaid (Penetration Aid) (Formerly an acronym for Penetration Aid.) Techniques or devices employed by offensive aerospace weapon systems to increase the probability of penetrating…
Penalty See Fee
Pending The status of a patent application that occurs before either an application is abandoned (withdrawn) or a patent issues.
pending file File of materials held for further action
penetration The intentional passage, through a building wall or partition, or an equipment enclosure or chassis, of a signal-bearing communications medium, e.g.
penetration test A test of a system which attempts to breach the System Security policy. Also known as "pen-test" [CESG].
Penetration Testing The portion of security testing in which the penetrators attempt to circumvent the security features of the system.
PEO Program Executive Officer.
PEO (SC/AP) Program Executive Officer, Surface Combatants/AEGIS Program.
PEO (TAD) Program Executive Officer, Theater Air Defense. (U.S. Navy)
PEO (TAD)-B Program Executive Officer, U.S. Navy Theater Ballistic Missile Defense Program Office.
PEO-AMD Program Executive Officer, Air and Missile Defense. (U.S. Army)
PEP Producibility Engineering and Planning.
PEPP Producibility Engineering and Production Planning.
Per Device licensing mode A mode in which the terminal server requests a TS Per Device client access license (TS Per Device CAL) from a Terminal Services license server so that a…
Per User licensing mode A mode in which the terminal server requests a TS Per User client access license (TS Per User CAL) from a Terminal Services license server so that a user…
per-call key [A] unique traffic encryption key generated automatically by certain secure telecommunications systems to secure single voice or data transmissions.
percent break In pulsed telephone signaling (dialing), the ratio, expressed in percent, of (a) the open-circuit (break) time to (b) the sum of the open- and…
percentage modulation In angle modulation, the fraction of a specified reference modulation, expressed in percent. 2.
Peregrine An Air Force boost-phase interceptor concept under development at USAF/SMC.
perfect forward secrecy In cryptography, of a key-establishment protocol, the condition in which the compromise of a session key or long-term private key after a given session…
Performance Those operational and support characteristics of the system that allow it to effectively and efficiently perform its assigned mission over time.
performance anomalies A discrepancy between actual and desired characteristics of an item. An anomaly may or may not affect the ability of an item to perform a required…
performance evaluation The technical assessment of a system or system component to determine how effectively operating objectives have been achieved [POSIX.0].
Performance Logs and Alerts A Distributed Component Object Model (DCOM) API that enables application programmers to log system performance and diagnosis data, and to generate alert…
performance management In network management, (a) a set of functions that evaluate and report the behavior of telecommunications equipment and the effectiveness of the network…
performance measurement period The period during which performance parameters are measured. Note: A performance measurement period is determined by required confidence limits and may…
performance parameter A quality, usually quantified by a numerical value, which quality characterizes a particular aspect, capability, or attribute of a system.
performance primitives Basic error events or other performance-related occurrences that may be detected by monitoring a digital signal. [T1.503-1996]
performance reliability The ability of an item to perform a required function under given conditions for a given time period.
Performance Requirement A requirement that specifies a performance characteristic that a system or system or system component must possess; for example, speed, accuracy…
Performance Specification (1) A specification that sets forth the performance requirements for a system or system component. (2) Synonymous with requirements specification.
performance standard A statement of general criteria that define a desired result without specifying the techniques for achieving that result.
periapsis In a satellite orbit, the point that is closest to the gravitational center of the system consisting of the primary body and the satellite.
Perigee The closest distance between moon and earth or the earth and sun.