Telecommunications — page 11 of 85

Telecommunications terms

1001. call segment A specific portion of the processing of a call. [T1.667-1999]
1002. call set-up error probability The ratio of total call attempts that result in call set-up error to the total call attempts in a population of interest. [T1.504-1989]
1003. call set-up failure probability The ratio of total call attempts that result in call set-up failure to the total call attempts in a population of interest. [T1.504-1989]
1004. call set-up time 1. The overall length of time required to establish a circuit-switched call between users. 2.
1005. call sign A station or address designator represented by a combination of characters or pronounceable words that is used to identify such entities as a…
1006. call spill-over In common-channel signaling, the effect on a traffic circuit of the arrival at a switching center of an abnormally delayed call control signal relating to…
1007. call splitting A switching system service feature that allows a switch attendant to talk privately in either direction on an established call.
1008. Call Through Test The call through test confirms capabilities of the interface relative to an actual or simulated call: Basic call set-up; sequential, acknowledged…
1009. call tracing A procedure that permits an entitled user to be informed about the routing of data for an established connection, identifying the entire route from the…
1010. call transfer A switching system service feature that allows the calling or called user to instruct the local switching equipment or switch attendant to transfer an…
1011. call waiting In telephony, a service feature that provides an indication to a terminal already engaged in an established call that one or more calls are awaiting…
1012. call-failure signal A signal sent in the backward direction indicating that a call cannot be completed because of a time-out, a fault, or a condition that does not correspond…
1013. call-not-accepted signal A call control signal sent by the called terminal to indicate that it does not accept the incoming call.
1014. call-processing state A call state during which the network establishes a communications path between the caller and the public safety answering point (PSAP) customer…
1015. call-request time In the establishment of a connection or in the call setup, i.e., placement of a call, the time from the initiation of a calling signal to the receipt of a…
1016. call-second A unit used to measure communications traffic. Note 1: A call-second is equivalent to 1 call 1 second long.
1017. call-selection time In the establishment of a connection or the placement of a call, the time from the receipt by the call originator of a proceed-to-select signal (dial…
1018. call-sign allocation plan The table of allocation of international call sign series contained in the current edition of the International Telecommunication Union (ITU) Radio…
1019. called party Synonym call receiver.
1020. called-line identification facility A network-provided service feature in which the network notifies a calling terminal of the address to which the call has been connected.
1021. called-line identification signal A sequence of characters transmitted to the calling terminal to permit identification of the called line.
1022. called-party camp-on A communication system service feature that enables the system to complete an access attempt in spite of issuance of a user blocking signal.
1023. caller ID A network service feature that permits the recipient of an incoming call to determine, even before answering, the number from which the incoming call is…
1024. caller identification See caller ID.
1025. caller's emergency service identification (CESID) The number used to identify the calling terminal within the context of the emergency service call. [T1.414-1998]
1026. calling frequency A radio frequency that a station uses to call another station.
1027. calling line identification (CLI) At a minimum, the calling line identification includes a single calling party number; it may also include a second calling party number, a calling party…
1028. calling party Synonym call originator.
1029. calling party number (CPN) A set of digits and related indicators (type of number, numbering, plan identification, screening indicator, presentation indicator) that provide…
1030. calling party pays A billing method in which a wireless phone caller pays only for making calls and not for receiving them.
1031. calling rate The number of telephone calls originated during a specified time interval such as one hour.
1032. calling sequence A sequence of instructions together with any associated data necessary to perform a call.
1033. calling signal A call control signal transmitted over a circuit to indicate that a connection is desired.
1034. calling-line identification facility A network-provided service feature in which the network notifies a called terminal of the address from which the call has originated.
1035. calling-line identification signal A sequence of characters transmitted to the called terminal to permit identification of the calling line.
1036. calling-party camp-on A service feature that enables the system to complete an access attempt in spite of temporary unavailability of system transmission or switching…
1037. calls-barred facility A service feature that permits a terminal either to make outgoing calls or to receive incoming calls, but not both.
1038. CAMA Acronym for centralized automatic message accounting.
1039. camcorder A combination of camera and video tape recorder in one device. Note: Camcorders permit easy and rapid photography and recording simultaneously.
1040. camp-on See automatic callback, called-party camp-on, queue traffic.
1041. camp-on busy signal A signal that informs a busy telephone user that another call originator is waiting for a connection. 2.
1042. camp-on-with-recall A camp-on with the release of the call-originator terminal until the called-receiver terminal becomes free.
1043. CAN Abbreviation for cancel character.
1044. Canadian Standards Association (CSA) An independent, nongovernment, not-for-profit association for the development, by consensus, of Canadian standards and product certification.
1045. cancel character (CAN) A control character used by some conventions to indicate that the data with which it is associated are in error or are to be disregarded. 2.
1046. Cancel To CANT is a trunk group control that allows traffic to be canceled before hunting for a circuit to a destination.
1047. Candela The luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and that has a radiant…
1048. canonical name A domain name of an Internet resource indicating its type or its capabilities. Note: One Internet resource may have a set of different domain names, one…
1049. Capability The maximum load that a generating unit, power plant, or other electrical apparatus can carry under specified conditions for a given period of time…
1050. capability code Synonym alias point code.
1051. capacitive coupling The transfer of energy from one circuit to another by means of the mutual capacitance between the circuits.
1052. Capacity Your ability to make your mortgage payments on time. This depends on your income and income stability (job history and security), your assets and savings…
1053. capture effect A phenomenon, associated with FM reception, in which only the stronger of two signals at or near the same frequency will be demodulated.
1054. card session In telephone-service security, a link between the card and a terminal starting with the answer to reset (ATR) and ending with a subsequent reset or a…
1055. card validation The validating process that includes, but is not limited to, ensuring that a telecommunications charge card has been assigned by the card issuer and that…
1056. cardinal radial Eight imaginary straight lines extending radially on the ground from an antenna location in the following azimuths with respect to true North: 0°, 45°…
1057. carrier A heterozygous individual bearing a recessive mutant allele for a defective condition that is "masked" by the presence of the dominant normal allele; the…
1058. carrier (cxr) A wave suitable for modulation by an information-bearing signal. 2. An unmodulated emission.
1059. carrier access code (CAC) A code (dialed by the user) to select a specific service provided by the entity to which the code is assigned by the NANPA (North American Numbering Plan…
1060. carrier dropout A short-duration loss of carrier signal.
1061. carrier facility system A transmission facility that provides several telecommunication channels over a single bidirectional path.
1062. carrier frequency The nominal frequency of a carrier wave. 2. In frequency modulation, synonym center frequency. 3.
1063. carrier identification code (CIC) A numeric code assigned by the North American Numbering Plan (NANP) Administrator for the provisioning of selected switched services.
1064. carrier leak The carrier remaining after carrier suppression in a suppressed carrier transmission system.
1065. carrier level The level of a carrier signal at a specified point in a communications system. Note: The carrier level is usually expressed in dB relative to a specified…
1066. carrier multiplex See frequency-division multiplexing.
1067. carrier noise level The noise level resulting from undesired variations of a carrier in the absence of any intended modulation. Synonym residual modulation.
1068. carrier power (of a radio transmitter) The average power supplied to the antenna transmission line by a transmitter during one radio frequency cycle taken under the condition of no modulation.
1069. carrier selection A code that identifies whether the caller dialed the elected or chosen carrier and whether the caller presubscribed to the elected or chosen carrier. [T1.
1070. carrier sense In a local area network, an ongoing activity of a data station to detect whether another station is transmitting.
1071. carrier sense multiple access (CSMA) A network control scheme in which a node verifies the absence of other traffic before transmitting.
1072. carrier sense multiple access with collision avoidance (CSMA/CA) A network control protocol in which (a) a carrier sensing scheme is used, (b) a data station that intends to transmit sends a jam signal, (c) after…
1073. carrier sense multiple access with collision detection (CSMA/CD) A network control protocol in which (a) a carrier sensing scheme is used and (b) a transmitting data station that detects another signal while…
1074. carrier shift In the transmission of binary or teletypewriter signals, keying in which the carrier frequency is shifted in one direction for marking signals and in the…
1075. carrier suppression See suppressed carrier transmission.
1076. carrier synchronization In a radio receiver, the generation of a reference carrier with a phase closely matching that of a received signal.
1077. Carrier System A means of obtaining a number of channels over a single path by modulating each channel upon a different carrier frequency, and demodulating at the…
1078. carrier wave Synonym carrier (cxr).
1079. carrier-to-noise ratio (CNR) In radio receivers, the ratio of the level of the carrier to that of the noise in the intermediate frequency (IF) band before any nonlinear process, such…
1080. carrier-to-receiver noise density (C/kT) In satellite communications, the ratio of the received carrier power to the receiver noise power density.
1081. CARS Consolidated Acquisition Reporting System.
1082. Carson bandwidth rule A rule defining the approximate bandwidth requirements of communications system components for a carrier signal that is frequency modulated by a…
1083. CAS (1) Close Air Support. (2) Computer-Aided Servicing. (3) Crisis Action System. (4) Cost Accounting Standard.
1084. cascade 1. A series of reply posts to a message on a bulletin board system. 2. An offset stack of (usually) active windows displayed on a computer screen. 3.
1085. CASE The last card of a certain rank in the deck. Example: "The flop came J-8-3; I've got pocket jacks, he's got pocket 8's, and then the case eight falls on…
1086. case shift In data equipment, the change from letters to other characters, or vice versa. 2.
1087. CASE technology Technology that makes use of computer assisted software engineering (CASE) to enhance the development of systems design and development.
1088. Cassegrain antenna An antenna in which the feed radiator is mounted at or near the surface of a concave main reflector and is aimed at a convex secondary reflector slightly…
1089. catastrophic degradation The rapid reduction of the ability of a system, subsystem, component, equipment, or software to perform its intended function.
1090. category A word, phrase, or number used to group documents in a view.
1091. Category 3 The ANSI/EIA/TIA-568 designation for 100-ohm unshielded twisted-pair cables and associated connecting hardware whose characteristics are specified for…
1092. Category 4 The ANSI/EIA/TIA-568 designation for 100-ohm unshielded twisted-pair cables and associated connecting hardware whose characteristics are specified for…
1093. Category 5 The ANSI/EIA/TIA-568 designation for 100-ohm unshielded twisted-pair cables and associated connecting hardware whose characteristics are specified for…
1094. CATV Abbreviation for cable TV.
1095. CAV Abbreviation for component analog video. A signal in which an analog voltage or current, rather than a set of numbers, represents the value of a pixel.
1096. Caveat Notice of opposition; caution; warning.
1097. cavity (KA-vih-tee) A hollow area or hole. It may describe a body cavity (such as the space within the abdomen) or a hole in a tooth caused by decay.
1098. CCD (1) Charge-Coupled Device. (2) Camouflage, Concealment, and Deception.
1099. CCH Abbreviation for connections per circuit hour.
1100. CCIP Abbreviation for Commission on Critical Infrastructure Protection. See Critical Infrastructure.