grade of service (GOS)1. The probability of a call's being blocked or delayed more than a specified interval, expressed as a decimal fraction.
graded-index fiberAn optical fiber with a core having a refractive index that decreases with increasing radial distance from the fiber axis.
graded-index profileIn the core of an optical fiber, a plot of the variation of refractive index such that the refractive index decreases with increasing radial distance from…
GradientGeneral slope or rate of change in vertical elevation per unit of horizontal distance of water surface of a flowing stream.
Graduated SecurityA security system that provides several levels (e.g., low, moderate, high) of protection based on threats, risks, available technology, support services…
grain toleranceA parameter controlling the number of vertices and the distance between them on arcs representing curves.
Grand ChallengeA problem that by virtue of its degree of difficulty and the importance of its solution, both from a technical and societal point of view, becomes a focus…
grandfathered systemsSystems, including but not limited to: (a) PBX and key telephone systems, directly connected to the public switched telephone network on June 1, 1978…
grandfathered terminal equipmentTerminal equipment (other than PBX and key telephone systems) and protective circuitry connected to the public switched telephone network before July 1…
GranularityThe size of the pieces you're dealing with, mentally speaking.
graphic characterA visual representation of a character, other than a control character. 2. In the ASCII code, a character other than an alphanumeric character, intended…
graphical user interface (GUI)A graphical method of controlling how a user interacts with a computer to perform various tasks.
graphicsThe art or science of conveying information through the use of display media, such as graphs, letters, lines, drawings, and pictures.
graphics display terminalA computer terminal used to view and manipulate graphic information. It can also be used for graphic selection (e.g.
graphics pageThat area on the graphics display device reserved for map display, or simulating the plotter page area.
graphics pipeIn computer science and technology, the special hardware within the computer optimized for the display of real-time 3D graphics.
GRASERGamma-Ray Amplification by Stimulated Emission of Radiation. (See Gamma- Ray Laser.)
gravity modelA methodology used in the geography, engineering and social sciences to model the behavior of populations.
Gray codeA binary code in which consecutive decimal numbers are represented by binary expressions that differ in the state of one, and only one, one bit.
Gray ScaleThe use of many shades of gray to represent an image. Continuous-tone images, such as black-and-white photographs, use an almost unlimited number of…
Greenwich Civil Time (GCT)Synonym Greenwich Mean Time (GMT). Obsolete term. See Coordinated Universal Time.
Greenwich Mean Time (GMT)Same as Coordinated Universal Time (UTC); the international time standard kept at Greenwich, England.
grepOriginally from the old Unix editor command for "Globally search for a Regular Expression and Print it", now used in the general sense of any kind of…
Grey Hat SEOSEO using both Black Hat and White Hat techniques.
GridA common term referring to an electricity transmission and distribution system.
grid cellA discretely uniform unit that represents a portion of the Earth, such as a square meter or square mile.
Grid ComponentThe grid component is a super class of object that represents every managed entity, whether physical or logical, within an enterprise grid.
Grid ComputingThe use of pools of resources onto which applications or services may be dynamically provisioned and re-provisioned to meet the goals of one or more…
grid map fileA file containing entries mapping certificate subjects to local user names. This file can also serve as a access control list for GSI enabled services and…
grid security directoryThe directory containing GSI configuration files such as the GSI authorization callout configuration and GAA configuration files.
Grid Security Infrastructure (GSI)GSI stands for Grid Security Infrastructure and is used to describe the original infrastructure of GT security, which is comprised of SSL, PKI and proxy…
GridFTPThe Grid File Transfer Program provides high-performance and reliant data transfer.
GRIS (Grid Resource Information Service)The Grid Resource Information Service is the repository of local resource information derived from information providers.
GroundA device used to protect the user of any electrical system or appliance from shock.
ground constantsThe electrical parameters of earth, such as conductivity, permittivity, and magnetic permeability.
ground controlPhysical points on the ground whose positions are known with respect to some horizontal coordinate system and/or vertical datum.
ground currentIn the presence of an electrical fault, the current that flows in the protective ground wire of a power distribution system.
Ground Entry Point (GEP)OBSOLETE. GEPs provide the communications interfaces between the SDS space orbital/sub-orbital elements and the C 2 E. See IFICS.
Ground LoopIn geothermal heat pump systems, a series of fluid-filled plastic pipes buried in the shallow ground, or placed in a body of water, near a building.
ground planeAn electrically conductive surface that serves as the near-field reflection point for an antenna. Note: A ground plane may consist of a natural (e.g.
ground potentialThe zero reference level used to apply and measure voltages in a system. Note: A potential difference may exist between this reference level and the…
Ground-Based Interceptor (GBI)A kinetic energy exoatmospheric interceptor with long flyout range to provide, where possible, a multiple engagement capability for defense of the U.S.
Ground-Based Radar (GBR)A task-able, modular, multi-function, phased-array radar that provides surveillance, tracking and engagement planning data in post-boost, midcourse, and…
Ground-Based Radar Terminal (GBRT)The sensor for the NMD system. An X-band, ground-based, phased array radar capable of detecting, tracking, and providing discrimination information to a…
ground-return circuitA circuit using a common return path that is at ground potential. Note: Earth may serve as a portion of the ground-return circuit. 2.
ground-start signalingA type of analog voicegrade access line signaling that requires the customer interface (CI) to provide a ground on the ring conductor at the network…
group(also referred to as a Technology Center or TC) - a unit of several Group Art Units in the mechanical, electrical, chemical or design area, managed by one…
group addressIn a communications network, a predefined address used to address only a specified set of users. Synonym collective address.
group alerting and dispatching systemA service feature that (a) enables a controlling telephone to place a call to a specified number of telephones simultaneously, (b) enables the call to be…
group delayThe rate of change of the total phase shift with respect to angular frequency, dθ/d, through a device or transmission medium, where θ is the total phase…
group delay timeIn a group of waves that have slightly different individual frequencies, the time required for any defined point on the envelope (i.e.
group distribution frame (GDF)In frequency-division multiplexing, a distribution frame that provides terminating and interconnecting facilities at the group level, i.e.
group ID (GID)The number used by UNIX systems to identify groups.
group index (N)In fiber optics, for a given mode propagating in a medium of refractive index η, the velocity of light in vacuum, c, divided by the group velocity of the…
Group membershipsThe groups to which a user account belongs. Permissions and rights granted to a group are also provided to its members.
Group Policy containerAn object that is stored in Active Directory Domain Services and that is associated with a given Group Policy object.
Group Policy Management EditorThe name of the window for the editor snap-in that accompanies the Group Policy Management Console.
Group Policy ObjectA collection of Group Policy settings, stored at the domain level as a virtual object that consists of a Group Policy container and a Group Policy…
Group Policy object (GPO)A logical concept that is used to represent a single collective set of computer and/or user policies.
Group Policy Object EditorThe Microsoft Management Console (MMC) snap-in that is used to edit Local Group Policy settings.
groupwareSoftware designed to operate on a network and allow several people to work together on the same documents and files.
Growable DiskA type of virtual disk in which only as much host disk space as is needed is initially set aside, and the disk grows as the virtual machine uses the space.
GSEAbbreviation for government sponsored enterprisesa collection of financial services corporations formed by the United States Congress to reduce interest…
GSM (Global system for mobile communication)one of the leading digital cellular systems. GSM uses narrowband TDMA , which allows eight simultaneous calls on the same radio frequency.