Technology Glossary : P


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  • P
    Procedure-Required Tuned NAVAID
  • P O P
    Point of Presences - A location of telecommunication carrier equipment
  • P O T S
    "Plain Old Telephone Service" - a reference to basic voice telephone service
  • P2P
    See Peer-to-Peer Network.
  • PA
    Pan Am
  • PAC
    Partial Solar Calibrator
  • Package
    A prerecorded piece that includes a narration or voice over, interviews, and natural sound. A package is also referred to...
  • Packet
    A technique used to break large quantities of data into small groups, or packets, to facilitate transmission with very few...
  • Packet
    A packet is a message fragment containing data or information. When messages are sent on the Internet, they are broken...
  • Packet
    A single group of digital signals sent from an originator to an addressee.
  • Packet Radio
    The radio transmission of data in packets between stations.
  • Packet Sniffing
    Packet sniffing refers to the collection and analysis of data packets (including contents) as they transit the network.
  • Packet Switch
    A switch that moves data packets from multiple transmissions and provide for efficient sharing of communication facilities.
  • Packet Switching
    Refers to the protocols within a network that determine how messages are broken into packets (q.v.) and routed to their...
  • PAGING SYSTEM
    A one-way mobile radio service where a user carries a small, lightweight miniature radio receiver capable of responding to coded...
  • PAGING SYSTEM
    A one-way mobile radio service where a user carries a small, lightweight miniature radio receiver capable of responding to coded...
  • Paging System
    One-way mobile radio service where a user carries a small, lightweight miniature radio receiver capable of responding to coded...
  • pan sharpening
    The practice of using Landsat 7
  • panchromatic
    Describing films or detectors that are sensitive to broadband electromagnetic radiation (the entire visible part of the spectrum). Landsat 7...
  • PAR
    Precision Approach Radar
  • parallax
    The apparent change in the position of one object, or point, with respect to another, when viewed from different...
  • parameter
    Any quantity of a problem that is not an independent variable. More specifically, a term which distinguishes, from dependent variables,...
  • partial aperture solar calibrator PAC or PASC
    One of two on-board external solar calibrators on Landsat 7 ETM+. The PASC consists of structure in front of the...
  • partially processed
    In reference to Landsat images, those scene data which have only been radiometrically, corrected through the ground processing system, labeled...
  • passive sensor
    One type of remote sensing instrument, a passive sensor picks up radiation reflected or emitted by the Earth. The ETM+,...
  • Password
    a secret sequence of letters and numbers that will enable users to log on to a computer and prevent unauthorized...
  • Patch Cable Cord
    A twisted-pair, or fiber optic jumper cable used to make a connection between a network interface, or network port, and...
  • path
    The longitudinal center line of a Landsat scene corresponding to the center of an orbital track. Sequential numbers from east...
  • PAWES
    Performance Assessment and Workload Evaluation
  • Pay Per View
    Programming (usually movies or special events) that a cable subscriber specially requests to receive for a single fee added to...
  • payload
    Originally, the revenue producing portion of an aircraft's load (passengers, cargo, mail); by extension, that which a spacecraft carries that...
  • PBD
    Place Bearing/Distance (way point)
  • PC
    Personal computer.
  • PCS
    Personal Communications Service. A group of frequencies in the 1.8 to 2.0 GHz range reserved for cellular telephone communications.
  • PD
    Profile Descent
  • PDA
    See Personal Data Assistant.
  • PDB
    Performance Data Base
  • PDC
    Pre Departure Clearance
  • PDF
    See Portable Document Format PDF
  • PE
    Polyethylene.
  • Peer to peer network
    a configuration where people store their files on their own computers, and anyone on the network can access the files...
  • Peer to Peer Network P2P
    A configuration in which each computer on the network has the same capabilities as the other computers on the network...
  • PEP
    See "NP".
  • PERF
    Performance
  • perigee
    The point in the orbit of heavenly body, especially of a man-made satellite, at which it is nearest the...
  • Peripheral
    a device that is attached to a computer, such as a monitor, keyboard, mouse, modem, CD-ROM, DVD, printer, scanner, and...
  • PERSONAL COMMUNICATIONS SERVICE PCS
    Any of several types of wireless, voice and/or data communications systems, typically incorporating digital technology. PCS licenses are most often...
  • PERSONAL COMMUNICATIONS SERVICE PCS
    Any of several types of wireless, voice and/or data communications systems, typically incorporating digital technology. PCS licenses are most often...
  • Personal Communications Services PCS
    A term coined by the FCC, it describes a two-way, voice and digital, wireless telecommunications system. PCS encompasses cordless phones,...
  • Personal Data Assistant PDA
    A PDA is a handheld device (e.g. Palm Pilot
  • perturbation
    Irregular variation in, or deviation from, what is usual or expected, as in the orbital motion of a satellite being...
  • Petition For Reconsideration
    A Petition for Reconsideration is a written request submitted to the FCC for review of an action it has previously...
  • PF
    Pilot Flying
  • PFD
    Primary Flight Display
  • PHARE
    Program for Harmonized ATC Research in Europe
  • PHIBUF
    Performance Buffet Limit
  • PHINOM
    Nominal Bank Angle
  • PHY
    Physical Layer Device. The name used for a transceiver in Fast Ethernet and Gigabit Ethernet systems.
  • Physical Address
    The 48-bit MAC address assigned to a station interface, identifying that station on the network.
  • Physical security
    measures that must be taken to prevent theft, vandalism, and other types of harm to the technology equipment.
  • picture element pixel
    A unit whose first member is a resolution cell and whose second member is the grey shade assigned to that...
  • PIREPS
    Pilot Reports
  • pitch
    The rotation of a spacecraft about the horizontal axis normal to its longitudinal axis (in the along-track direction) so as...
  • pixel
    Abbreviation of picture element.
  • Pixel
    The smallest area of a television picture capable of being sampled, transmitted through a system and displayed on a...
  • Pixels
    in computers, pixels per inch (ppi) is a measure of the sharpness (that is, the density of illuminated points) on...
  • planetary albedo
    A unitless measure of the ratio of outgoing to incoming solar radiation created by converting a radiometrically calibrated image observed...
  • Platform
    the computer hardware and operating system software that runs application software.
  • Plenum
    The air return path of a central air handling system, either ductwork or open space over a dropped ceiling.
  • Plenum Cable
    Cable approved by Underwriters Laboratories for installation in plenums without the need for conduit because the insulation and jacket compounds...
  • Plug Ins
    Plug-Ins are software pieces that add a specific feature or service to a larger system. For example, in order to...
  • PMS
    Performance Management System
  • PN Participating
    formerly a Primary station. A PN is a participating station; i.e., any broadcast station (and cable TV firm) that broadcasts...
  • PND
    Primary Navigation Display
  • PNF
    Pilot Not Flying
  • point spread function
    The inferring of spatial characteristics of the instrument from the collected image of a point source such as a star....
  • Point to Point Transmission
    Carrying a communication signal between two locations without branching to other locations.
  • polar orbit
    A satellite orbit that passes over, or very close to, both poles of the Earth. Landsat 4, 5, and 7...
  • Pole Attachment
    A communications relay or receiving de-vice attached to a pole, duct or conduit owned or controlled by a utility...
  • Polyethylene
    A thermoplastic material having the chemical identity of polymerized ethylene.
  • Polyvinyl Chloride PVC
    A thermoplastic material composed of polymers of vinyl chloride which may be rigid or flexible depending on specific formulation.
  • POOMA
    Parallel Object Oriented Methods and Applications: Los Alamos' approach to doing parallel scientific computing by using high-level object descriptions of...
  • POOMA
    Parallel Object Oriented Methods and Applications: Los Alamos' approach to doing parallel scientific computing by using high-level object descriptions of...
  • Pop Up Ads
    Advertisements that appear in a separate browser window while a web site is being viewed.
  • Port
    A connection point on a hub, router, bridge, switch, etc.
  • Portable Document Format PDF
    A file format developed by Adobe Systems
  • Portal
    (Also, web portal.) "Portal" refers to a web site or service that offers a broad array of resources and services,...
  • POS
    Position
  • POS INIT
    Position Initialization
  • POS REF
    Position Reference
  • POTS
    Plain Old Telephone Service, basic voice phone service.
  • power
    The rate of doing work ;work per unit of time.
  • PPI
    Plan Position Indicator
  • PPOS
    Present Position
  • Premium Channels
    Channels not included in a cable provider
  • PRESCRIBED INTEREXCHANGE CHARGE PICC
    The charge the local exchange company assesses the long distance company when a consumer picks it as his or her...
  • PRESCRIBED INTEREXCHANGE CHARGE PICC
    The charge the local exchange company assesses the long distance company when a consumer picks it as his or her...
  • Preselected code
    an EAS event which the operator of EAS equipment has chosen to be automatically encoded and retransmitted upon reception.
  • pressure of gas
    pressure equals force divided by unit area.
  • Presubscription
    This term is used to describe the selection of a particular long distance carrier to handle all calls for "1+dialing"...

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