Telecommunications terms starting with I

449 terms

I/F Interface.
I/O Input/Output .
I/O controller Synonym input-output controller.
I2 Abbreviation for Internet second generation. A proposed high-speed Internet for use exclusively by government researchers and academic institutions.
IA Information Architecture.
IANA Abbreviation for Internet Assigned Numbers Authority. An organization directed by the Internet Architecture Board (IAB) and which assigns IP numbers and…
IB International Bureau - the secretariat of the WIPO which, among other functions, centralizes information of various kinds relating to the protection of…
IC International Class - class(es) assigned to a mark under the International Classification of Goods and Services (Nice Agreement); used in the United…
ICA (1) Independent Cost Analysis. (2) Independent Cost Assessment.
ICI Abbreviation for incoming call identification.
ICMP Abbreviation for Internet Control Message Protocol. An Internet protocol that reports datagram delivery errors.
icon In a GUI, a picture or drawing which is activated by clicking a mouse to command the computer program to perform a predefined series of events.
ICW Abbreviation for interrupted continuous wave.
IDEA (International Data Encryption Algorithm) Developed in Switzerland and licensed for non-commercial use in PGP. IDEA uses a 128 bit user supplied key to perform a series of nonlinear mathematical…
Identification The process of verifying the identity of a user, process, or device, usually as a prerequisite for granting access to resources in an IT system.
Identification Friend or Foe (IFF) A system using electromagnetic transmissions to which equipment carried by friendly forces automatically responds, fro example by emitting pulses, thereby…
identification friend or foe personal identifier The discrete identification, friend or foe code assigned to a particular aircraft, ship, or other vehicle for identification by electronic means. [JP1]
identification information A form of notification information that consists of the documentation of the actual sequence of intermediate networks traversed by a signaling message.
identifier (ID) In telecommunications and data processing systems, one or more characters used to identify, name, or characterize the nature, properties, or contents of a…
Identity The topological overlay of a coverage (input) with a polygon coverage (identity).
identity authentication The performance of tests to enable a data processing system to recognize entities.
identity token A device, such as a metal key or smart card, used for identity authentication. [After 2382-pt.8] 2.
identity validation Tests enabling an information system to authenticate users or resources. [INFOSEC-99]
Identity-Based Security Policy A security policy based on the identities and/or attributes of the object (system resource) being accessed and of the subject (user, group of users…
IDF Inverse Document Frequency is a term used to help determine the position of a term in a vector space model.
idle character A control character that is transmitted when no useful information is being transmitted. [From Weik '89]
idle code A special sequence that indicates that no data are being sent on the channelized side. [T1.509-1995]
idle state The telecommunications service condition that exists whenever user messages are not being transmitted but the service is immediately available for use.
idle time A period during which a system, circuit, or component is not in use, but is available.
idle-channel noise Noise that is present in a communications channel when no signals are applied. Note: The channel conditions and terminations must be stated for…
idle-line termination A switch-controlled electrical network that maintains a desired impedance at a trunk or line terminal that is in the idle state.
IDN Abbreviation for integrated digital network.
IDTV Abbreviation for improved-definition television.
IETF Internet Engineering Task Force.
IF Ironforge
IF repeater See heterodyne repeater.
IF1 (interface 1) An interface suitable for star concentration. [T1.201-1987] [T1.204-1988]
IF2 (interface 2) An interface suitable for communication between a network element (NE) location and operations systems (OSs) over packet switched networks, dedicated…
IF4 (interface 4) An interface suitable for multipoint concentration by polling. [T1.201-1987] [T1.204-1988]
IF6 (interface 6) An interface between a network element (NE) to one or more network elements (NEs) in other locations using star configuration embedded operations channel…
IFF Identification, Friend or Foe.
IFRB Abbreviation for International Frequency Registration Board.
IFS Abbreviation for ionospheric forward scatter. See ionospheric scatter.
ILD Abbreviation for injection laser diode.
ILEC Abbreviation for incumbent local exchange carrier. The incumbent or existing franchised local exchange carrier in any given area. [After FCC]
illegal character A character, or a combination of bits, that is not valid in a given system according to specified criteria, such as with respect to a specified alphabet…
ILS Integrated Logistics Support.
IM Within or into muscle. Also called intramuscular.
Image To image a hard drive is to make an identical copy of the hard drive, including empty sectors.
image antenna A hypothetical mirror-image, i.e., virtual-image, of an antenna, i.e., antenna element, considered to extend as far below ground, i.e.
image capture The transducing of the information in a real image into the photographic or electronic medium.
image compression Application of an appropriate transfer function to an image signal so as to limit dynamic range. 2.
image enhancement In video technology, a technique used to improve contrast and picture clarity by flattening the camera response to 400 lines (by aperture correction) and…
image file architecture The formalization of a multidisciplinary agreement-regarding digital image characteristics, such as the structure of digital image files, the organization…
image file descriptor A block of data that (a) may contain, in standardized format, data concerning production, ownership, access, previous processing, etc.
image file header A compact label for image files, created using a universally accepted algorithm, that (a) identifies the encoding standard, (b) specifies the length of…
image file motion-picture format The defining file format for exchange of digital motion-picture information on a variety of media between computer-based systems.
image file video index A recommended practice intended to provide a method of coding video index information in which various picture- and program-related source data can be…
image frequency In radio reception using heterodyning in the tuning process, an undesired input frequency that is capable of producing the same intermediate frequency…
image frequency rejection ratio Synonym image rejection ratio.
image generation The creation of an image from an image concept. Note: The image can be created with computer-graphics software or photography, for example.
image map An image divided into logical areas, each of which has a hot spot.
image rejection ratio In reception using heterodyning in the tuning process, the ratio of (a) the intermediate-frequency (IF) signal level produced by the desired input…
imagery (IH-mij-ree) A technique in which the person focuses on positive images in his or her mind.
IMD Abbreviation for intermodulation distortion.
imitative communications See communications deception.
immediate action limit (IAL) The bound on performance allowed for a circuit or connection that is in service.
immediate activation In cryptology, a condition of readiness associated with a key having no effective date.
immediate message A category of precedence reserved for messages relating to situations that gravely affect the security of national/allied forces or populace and that…
Immunity (ih-MYOO-nih-tee) The condition of being protected against an infectious disease.
IMP Integrated Master Plan.
Impaired Is where an individual circuit exceeds the transmission limits or where the quality of service is diminished.
impedance The amount of resistance (or cost) required to traverse a line from its origin node to its destination node or to make a turn (i.e.
impedance matching The connection of an additional impedance to an existing one in order to accomplish a specific effect, such as to balance a circuit or to reduce…
impersonating [A] form of spoofing. [INFOSEC-99]
implant A substance or object that is put in the body as a prosthesis, or for treatment or diagnosis.
Implementation How a piece of code actually goes about doing its job. Users of the code should not count on implementation details staying the same unless they are part…
implicit congestion control A scheme under which user terminals first detect a possible congestion condition by means other than explicit congestion messages, and then take…
implicit services Services that a platform provides without a direct request [POSIX.0].
improper character Synonym illegal character.
improved-definition television (IDTV) Television transmitters and receivers that (a) are built to satisfy performance requirements over and above those required by the NTSC standard and (b)…
improvement threshold See FM improvement threshold.
Impulse (abbrev. IMPL) Alternate term for Upper Level System and Shortwave; a general term for any large-scale or mesoscale disturbance capable of producing…
impulse excitation The production of oscillation in a circuit or device by impressing a stimulus (signal) for a period that is extremely short compared to the duration of…
impulse noise Noise consisting of random occurrences of energy spikes having random amplitude and spectral content.
impulse response Of a device, the mathematical function that describes the output waveform that results when the input is excited by a unit impulse. 2.
IN Inch.
in call A UPT (Universal Personal Telecommunications) call type which permits a UPT user to have calls to his/her UPT number routed to the terminal specified by…
in call delivery A feature by which incoming calls are presented at the terminal address registered previously by in-call registration.
In Service A code or block for which local routing information has been input to the LERG Routing Guide and the carrier has begun to activate and assign numbers…
in-band Using or involving the information digit time slots of a DS1 frame; i.e., bit assignments of a frame exclusive of the framing bit.
in-band control Control effected by sending control information over the same channel as the one used to send data.
in-band noise power ratio For multichannel equipment, the ratio of (a) the mean noise power measured in any channel, with all channels loaded with white noise, to (b) the mean…
in-band signaling Signaling that uses frequencies or time slots within the bandwidth or data stream occupied by the information channel.
in-call registration A feature that enables the UPT (Universal Personal Telecommunications service) user to register from the current terminal address for incoming calls to be…
in-slot signaling Signaling performed in the associated channel time slot.
inactive signaling link A signaling link that has been deactivated and cannot therefore carry signaling traffic. [T1.110-1987]
INC Industry Numbering Committee, a standing committee of the Alliance for Telecommunications Industry Solutions (ATIS) that provides an open forum to address…
Incident A violation or imminent threat of violation of computer security policies, acceptable use policies, or standard computer security practices.
incidental-radiation device A device that radiates radio frequency energy during the course of its operation although the device is not intentionally designed to generate radio…