Telecommunications terms starting with C

924 terms

computer security subsystem Hardware/software designed to provide computer security features in a larger system environment. [INFOSEC-99]
computer system A functional unit, consisting of one or more computers and associated software, that (a) uses common storage for all or part of a program and also for all…
computer system fault tolerance The ability of a computer system to continue to operate correctly even though one or more of its components are malfunctioning.
computer system resilience Synonym computer system fault tolerance.
computer systems engineering See systems design.
computer word In computing, a group of bits or characters that occupies one or more storage locations and is treated by computers as a unit. Synonym machine word.
computer-aided software engineering See CASE.
computer-aided systems engineering See CASE.
computer-dependent language Synonym assembly language.
computer-oriented language A programming language in which words and syntax are designed for use on a specific computer or class of computers.
computer-system audit An examination of the procedures used in a data processing system to evaluate their effectiveness and correctness, and to recommend improvements. [2382-pt.
computing system Synonym computer system.
COMSEC Communications Security.
COMSEC boundary [The] definable perimeter encompassing all hardware, firmware, and software components performing critical COMSEC functions, such as key generation and…
COMSEC chip set [A] collection of NSA-approved microchips. [INFOSEC-99]
COMSEC control program Computer instructions or routines controlling or affecting the externally performed functions of key generation, key distribution, message…
COMSEC end-item Equipment or a combination of components ready for use in a COMSEC application. [INFOSEC-99]
COMSEC equipment Equipment designed to provide security to telecommunications by converting information to a form unintelligible to an unauthorized interceptor and…
COMSEC insecurity COMSEC incident that has been investigated, evaluated, and determined to jeopardize the security of COMSEC material or the secure transmission of…
COMSEC material [An] item designed to secure or authenticate telecommunications. Note: COMSEC material includes, but is not limited to, key, equipment, devices…
COMSEC module [A] removable component that performs COMSEC functions in a telecommunications equipment or system. [INFOSEC-99]
COMSEC monitoring [The] act of listening to, copying, or recording transmissions of one's own official telecommunications to analyze the degree of security. [INFOSEC-99]
COMSEC profile [A] statement of COMSEC measures and materials used to protect a given operation, system, or organization. [INFOSEC-99]
COMSEC survey [An] organized collection of COMSEC and communications information relative to a given operation, system, or organization. [INFOSEC-99]
COMSEC system data Information required by a COMSEC equipment or system to enable it to properly handle and control key. [INFOSEC-99]
concentration equipment Central office equipment whose function is to concentrate traffic from subscriber lines onto a lesser number of circuits between the remotely located…
Concentrator A photovoltaic module, which includes optical components such as lenses (Fresnel lens) to direct and concentrate sunlight onto a solar cell.
concentricity error In an optical fiber, the distance between the center of the two concentric circles that specify the cladding diameter and the center of the two concentric…
concrete signal An off-hook condition applied to the network interface (NI) by the network that indicated the network intends to complete a call attempt to the customer…
concrete syntax Those aspects of the rules used in the formal specification of data that embody a specific representation of those data. [T1.208-1989]
concurrent operation Synonym multitasking. 2. In data link operations, the operation in which two or more data links are used during the same, usually short, time interval…
conditioned baseband representation Synonym non-return-to-zero mark.
conditioned circuit A communications circuit optimized to obtain desired characteristics for voice or data transmission.
conditioned diphase modulation A form of diphase modulation, combined with signal conditioning, that (a) eliminates the dc component of the signal, (b) enhances timing recovery, and (c)…
conditioned loop A loop that has conditioning equipment to obtain the desired line characteristics for voice or data transmission.
conditioning equipment At junctions of circuits, equipment used to obtain desired circuit characteristics, such as matched transmission levels, matched impedances, and…
conducted interference Interference resulting from noise or unwanted signals entering a device by conductive coupling, i.e., by direct coupling. 2.
Conduction Band An energy band in a semiconductor in which electrons can move freely in a solid, producing a net transport of charge.
conductive coupling Energy transfer achieved by means of physical contact, i.e., coupling other than inductive or capacitive coupling.
cone of silence Synonym antenna blind cone.
CONEX CONOPS Exerciser.
conference active In conference calling, the state in which conference resources have been allocated to the specified conference and at least one party has a connection to…
conference call A service feature that allows a call to be established among three or more stations in such a manner that each of the stations is able to communicate with…
conference controller In audio and video teleconferences, the user in charge of the conference when the service is invoked and the conference reaches the active state.
conference floating In conference calling, the state in which the conference is active but without a controller.
conference ID In conference calling, the served user's (or controller's) reference to the conference itself. [T1.647-1995]
conference idle In conference calling, the state prior to the receipt of a "conference invocation request," or after a particular conference has ended. [T1.647-1995]
conference operation In a communications network, operation that allows a call to be established among three or more stations in such a manner that each of the stations is…
Confidence A measure of the security of a trusted function, or a set of trusted functions, as calculated by a competent authority [CESG].
confidence level A measure of confidence as described in CESG Computer Security Memorandum No.3 - "UK Systems Security Confidence Levels" [CESG].
Confidentiality In genetics, the expectation that genetic material and the information gained from testing that material will not be available without the donor's consent.
Configuration The number, shape, organization and relationship of panes (lights) of glass, sash, frame, muntins or tracery.
Configuration Baseline The configuration documentation formally designated by the Government at a specific time during a systems or configuration items life cycle.
Configuration Control One of the Configuration Management tasks that involves the systematic evaluation, coordination, approval, or disapproval of proposed changes to the…
configuration item A collection of hardware and software elements of a system treated as a unit for the purpose of configuration management [CESG].
configuration management 1. [The] management of security features and assurances through control of changes made to hardware, software, firmware, documentation, test, test…
configuration management board Group of people responsible for the management of changes to a system, to include assessment of their impact on security.
Confinement The prevention of information flow [CESG].
confirmation signaling Signaling that ensures error-free transmission of dialed information by returning a unique digit-dependent signal from the far end as each digit is sent…
confirmation to receive In facsimile, a signal from a CCITT Group 1, 2, or 3 facsimile receiver, indicating it is ready to receive picture signals.
conformance test A test performed by an independent body to determine if a particular piece of equipment satisfies the criteria in a specified controlling document, such…
Congestion A characteristic of the transmission system produced by a constraint on the optimum economic operation of the power system, such that the marginal price…
congestion level indicator (CLI) A local variable of a node that indicates the number of blocks to be dropped from packets containing droppable blocks (0, 1, 2, or 3 blocks may be…
connect signal An off-hook condition applied to the network interface (NI) by the network that indicated the network intends to complete a call attempt to the customer…
connect time The amount of time that a terminal (client) is being served by a network. [Bahorsky] Note: Connect time can refer to either the total amount of time that…
connecting arrangement In the public switched telephone networks, the equipment provided by a common carrier to accomplish electrical interconnection between customer-provided…
connection The physical connection (e.g. transmission lines, transformers, switch gear, etc.
connection control The set of functions used for setting up, maintaining, and releasing a communication path between two or more users or a user and a network entity, e.g.
connection endpoint (CE) A terminating device at one end of a layer connection within a service access point (SAP). [After T1.627-1993]
connection establishment The establishment of the capability for the transmission of user information. [T1.507-1996]
connection identification A number that identifies unambiguously a certain connection at the interface between the signaling connection control plan (SCCP) and a user function. [T1.
connection mode See connection-oriented mode transmission, connection-oriented network service.
connection-in-progress signal A call control signal at the data circuit-terminating-equipment/data-terminal-equipment (DCE/DTE) interface that indicates to the DTE that the…
connection-minute The product of (a) the number of messages and, (b) the average minutes of connection per message. [47 CFR Pt.36-A]
connection-mode transmission See connection-oriented mode transmission.
connection-oriented data transfer protocol A data-transfer protocol in which a logical connection is established between end user terminals.
connection-oriented mode transmission In a packet-switched network, a mode of transmission in which there is a complete information transfer transaction for each packet or group of packets, i.
connection-oriented network service A network service that establishes logical connections between end users before transferring information. [T1.110-1987]
connectionless data transfer See connectionless mode transmission.
connectionless mode transmission In a packet-switched network, transmission in which each packet is encoded with a header containing a destination address sufficient to permit the…
connectionless network service A network service that transfers information between end users without establishing a logical connection or virtual circuit between those specific users.
connectionless service A service that allows the transfer of information among subscribers without the need for end-to-end establishment procedures. [T1.629-1999]
connectionless transmission See connectionless mode transmission.
connections per circuit hour (CCH) A unit of traffic measurement expressed as the number of connections established at a switching point per hour. 2.
connectivity The topological identification of connected arcs by recording the from- and to-node for each arc. Arcs that share a common node are connected.
connectivity exchange (CONEX) In an adaptive or manually operated high-frequency (HF) radio network, the automatic or manual exchange of information concerning routes to stations that…
connector A hold'em starting hand in which the two cards are one apart in rank. Examples: KQs, 76.
conservation of radiance A basic principle of optics, that no passive optical system can increase the quantity L/n2, where L is the radiance of a beam and n is the local…
consolidated carrier A carrier authorized to provide telecommunications services both within and outside World Zone 1 using the yyNorth American Numbering Plan (NANP)and the…
consolidated local telecommunications service Local communications service provided by GSA to all Federal agencies located in a building, complex, or geographical area.
constant luminance In video, an image coding system that derives a luminance signal and two bandwidth-limited color-difference signals, to provide luminance information that…
Construction The process of creating a Target of Evaluation [ITSEC].
consultation hold A service feature that allows a speaker on an extension instrument to place one call on hold and to speak with another caller on a separate line.
Contamination To make impure, infected, corrupt, etc, by contact with or addition of something; to pollute something.
content In an XML document, the part that occurs after the prolog, including the root element and everything it contains.
content hierarchy levels The nested units of information into which a media stream can be decomposed. [T1.801.04-1997]
content hosting (hosting) Storage and management of databases by a content provider. [2382-pt.35]
content label A rating provided by a rating service that defines or categorizes the contents of a Web site. [Bahorsky]
content provider Any company in the business of aggregating or producing content for delivery via the Internet.
content-addressable storage Synonym associative storage.