Technology Glossary


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  • Object Web
    A mosaic of emerging software technologies nucleating around the internet, Java, and CORBA which can be used to build potentially...
  • observatory
    A place or structure, such as the Landsat satellite, equipped and used for making observations of astronomical or other natural...
  • OBTEX
    Offboard Targeting Experiments
  • OC x
    Optical Carrier rate specified for SONET; OC-3, OC-12, OC-48, etc.
  • OCT
    October
  • ODAPS
    Operational OGE Data Acquisition and Patch Subsystem
  • OES Office of Emergency Services
    The element of the State and local governments having responsibility for civil defense and natural disaster response programs. The California...
  • OFDM
    Orthogonal Frequency Division Multiplexing
  • OFST
    Lateral Offset Active Light
  • OGE
    Operational Ground Equipment
  • Ohm
    Unit of resistance such that a constant current of one ampere produces a force of one volt.
  • ohm
    a unit that measures resistance to electrical current flow, and is equal to volts divided by amperes.
  • OIS
    OGE Input Simulator
  • One Way Video Two Way Audio
    An interactive conference, class, or meeting in which participants see and hear the speaker(s) at the originating site as well...
  • Online
    the status of being connected to a computer or having information available through the use of a computer.
  • OO
    SkyWest Airlines
  • OP
    Operational
  • Open Outcry Auction
    An auction in which bidders openly shout out their bids.
  • OPEN VIDEO SYSTEMS
    An alternative method to provide cable-like video service to subscribers.
  • OPEN VIDEO SYSTEMS
    An alternative method to provide cable-like video service to subscribers.
  • Open Video Systems OVS
    An Open Video System is similar to a cable system. In an OVS, the system operator must lease channel capacity...
  • Opera
    is a Web browser that provides some differences with the two most popular browsers from Netscape and Microsoft. Much smaller...
  • Operable controls
    A component of a product that requires physical contact for normal operation. Operable controls include, but are not limited to,...
  • Operating Handbook
    a document issued by the FCC that instructs broadcast station and cable personnel of the actions they must take during...
  • Operating System
    The operating system (OS) contains the electronic instructions that control the computer and run the programs. This software is generally...
  • Operating system software
    the electronic instructions that control the computer and run the programs. This software is generally specific to a type of...
  • Operator Interruption
    the transmission of an EAS activation which has been manually initiated by broadcast station or cable system personnel.
  • OPERATOR SERVICE PROVIDER OSP
    A common carrier that provides services from public phones, including payphones and those in hotels/motels.
  • OPERATOR SERVICE PROVIDER OSP
    A common carrier that provides services from public phones, including payphones and those in hotels/motels.
  • Operator Service Provider OSP
    A common carrier that provides services from public phones, including payphones and hotel/motel phones.
  • OPT
    Optimum
  • optical axis
    An imaginary line drawn directly through the optical center of the camera lens to the geometric center of the film....
  • orbital node
    Either of the two points at which the orbit of a heavenly body intersects a given plane, especially the plane...
  • orbital period
    The interval in time between successive passages (orbits) of a satellite through a reference plane. The orbital period of Landsat...
  • Organization INTELSAT
    Formed under a multilateral agreement, it is the organization which owns, maintains, and operates the global satellite system used by...
  • Originating Site
    The site initiating the conference or meeting that is to be distributed simultaneously with technology such as audioconferencing or...
  • Originator Code
    a three character ASCII code in an EAS header which denotes the source of an activation.
  • orthorectified
    Describing an image in which image displacements due to tilt and relief have been removed.
  • OSI
    Open Standards Integration
  • OSI
    Open Sytem Interconnection (ISO defined communications architecture used in data link to permit heterogeneous data communication systems to be interconnected...
  • OSS
    Operational Support System
  • OTDR
    Optical Time-Domain Reflectometer. An instrument that measures transmission characteristics by sending a short pulse of light down a fiber and...
  • OTFP
    Operational Traffic Flow Planning
  • Outside Plant
    Telecommunication facilities that are placed outside of a building.
  • OV
    Overseas National Airways
  • 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

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