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5i' MONTAGE: FIN DE LA RECOMMANDATION Q.8 EN-T | TE DE CETTE PAGE Recommendation Q.9 VOCABULARY OF SWITCHING AND SIGNALLING TERMS (Geneva, 1980; modified at Malaga-Torremolinos, 1984; Melbourne 1988) 1 This Recommendation provides a vocabulary of terms and definitions which have been studied for application in documenta- tion on switching and signalling. The possible evolution toward integrated digital networks and integrated services digital net- works has been taken into account. 2 The terms are grouped in sections and within each section terms belonging to the same area of concepts are assembled. While such grouping in logical order may ease overview, it was not esta- blished according to firm principles and arbitrary placing of cer- tain terms was accepted. 3 Part of the terms and definitions in this Recommendation also are contained in specialized glossaries which are attached to certain Recommendations of the G, Q and Z Series. Care has been taken then that identical texts appear in both the Recommendation and the glossary. CONTENTS 0 - General terms (basic terms and terms common to several of the areas covered by the following sections) 1 - Switching functions and techniques 2 - Signalling functions and techniques 3 - Control functions 4 - Interfaces and interface functions (machine-machine) 5 - Equipment and hardware 6 - Executive software 7 - Functions for basic and supplementary services 8 - Mobile station networks 9 - Telephone subscriber's equipment and local lines Annex A - Alphabetical list of terms defined in this Recommenda- tion. According to the conventions applied in the lists, indications in round brackets are qualifiers or alternative terms in general use in addition to the principal term. Examples: call (in software) Examples: exchange (switching exchange, switching centre) Terms in square brackets are deprecated. The indication (USA) | after a term in English means that the term is used in the United States, and is different from that current in the United Kingdom. The indication (UK) | means the reverse. A number (1) or (2) after a term indicates that more than one definition is given (when the term acquires another meaning depend- ing on the context). Cross-references to the sources in SS 1 to 9 are given, where of interest, at the right-hand side of the line following the end of a definition. Sources quoted are ISO, Recommendation G.701 [1] and Recommendation I.112 [7], List of Essential Telecommunication Terms [2], the International Electrotechnical Vocabulary (IEV), Recom- mendations E.100 and E.600 [3]. The name of ISO and Recommenda- tions are mentioned along with a number; the terms derived from the "List of Essential Telecommunications Terms" give only a four digit number. The four digit number from E Recommendations [3] is pre- ceded by the designation "Study Group II". Numbers beginning with 714 refer to Chapter 714 (Switching), those with 716 to Chapter 716 (ISDN) of IEV. 0 General terms General terms and definitions as shown in S 0 have in many cases not been elaborated by Study Group XI. However, they need to be used in certain definitions for which the Study Group is respon- sible. A cross-reference to the source is given wherever possible. If no cross-reference is given, the term is quoted with the provi- sional meaning that Study Group XI adopted for it. Such defini- tions will be substituted by the definition of the competent body when available. It should be noted that the terms concerned will not necessarily be classified by the responsible body as "general" in the sense applied to S 0. 0001 communication (1) F: communication | (1) S: comunicacion | (1) Information transfer according to agreed conventions. Note 1 - In the context of the present vocabulary, the ordi- nary dictionary meaning of the term is appropriate and sufficient. Note 2 - The French term "communication" and the Spanish term "comunicacion" have the current meaning given in this definition, but they also acquire a more specific meaning in telecommunication (see 0009, 0010 and 0011). 0002 telecommunication F: telecommunication S: telecomunicacion Any process that enables a correspondent to pass to one or more given correspondents (telegraphy or telephony), or possible correspondents (broadcasting), information of any nature delivered in any usable form (written or printed matter, fixed or moving pic- tures, words, music, visible or audible signals, signals control- ling the functioning of mechanisms, etc.) by means of any elec- tromagnetic system (electrical transmission by wire, radio transmission, optical transmission, etc., or a combination of such systems). 01.01 0003 network, telecommunication network F: reseau, reseau de telecommunications S: red, red de telecomunicaciones A set of nodes and links that provides connections between two or more defined points to accommodate telecommunication between them. 0004 integrated digital network F: reseau numerique integre S: red digital integrada A network in which connections established by digital switch- ing are used for the transmission of digital signals. 0005 integrated digital network, digital network F: reseau numerique integre, reseau numerique S: red digital integrada, red digital A combination of digital switching nodes and digital links that uses integrated digital transmission, digital switching and common channel signalling to provide digital connections between two or more points to facilitate telecommunication and possibly other functions. 0007 channel; transmission channel F: voie; voie de transmission S: canal; canal de transmision A means of unidirectional communication. Note - Several channels may share a common path as in fre- quency division and time division systems; in these cases, each channel is allotted a particular frequency band or a particular time slot which is reserved for it. 0008 access channel [channel] F: voie d'acces [voie] S: canal de acceso [canal] A designated part of the information transfer capability, hav- ing specified characteristics, provided at the user-network inter- face. Note 1 - The term "transmission channel" is well understood to imply uni-directional working only, and then is commonly abbre- viated to "channel". To avoid confusion with this usage, the term "access channel", which encompasses bi-directional working through the user-network interface, must not be abbreviated to "channel". Note 2 - The term "access channel" may be qualified, for example, by H, B, or D in which case it is appropriate to abbrevi- ate the term to "H-channel", "B-channel" or "D-channel". 716.0402 .bp 0009 call (1) F: appel | 1) S: llamada | 1) In an automatic system, the action performed by a calling party in order to obtain communication with the wanted terminal equipment and by extension, the operations controlled by the action performed. call (2) F: communication | 2) S: comunicacion | 2) The use, or the possible use, of a complete connection set up between a calling party and the called party or service (see Note 2 of 0001). 0010 (complete) connection in telecommunication F: cha | ne de connexion complete, (chemin de) communica- tion S: conexion completa; cadena de conexion completa (en telecomunicaciones) An association of transmission channels or circuits, switching and other functional units set up to provide means for a transfer of information between terminals in a telecommunication network. Note 1 - A connection is the result of a switching operation. Note 2 - A connection which allows an end-to-end communica- tion, e.g. a conversation, may be called a "complete connection". Note 3 - The connection makes a communication possible but is not a communication. 0011 connection F: cha | ne de connexion S: conexion; cadena de conexion An association of transmission channels or circuits, switching and other functional units set up to provide a means for a transfer of information between two or more points in a telecommunication network. 0012 call attempt (1) (of a user) F: (tentative d')appel (d'un usager) (1) S: tentativa de llamada (de un usuario) (1) The sequence of operations made by a user of a telecommunica- tion network to obtain another party or a service. Note - Several call attempts may be required to establish a call. 0013 circuit, telecommunication circuit F: circuit, circuit de telecommunications S: circuito, circuito de telecomunicaciones A combination of two transmission channels permitting bidirec- tional telecommunication between two points, to support a single call. Note 1 - If the telecommunication is by nature unilateral, for example: long distance television transmission, the term "cir- cuit" is sometimes used to designate the single channel providing the facility. Note 2 - In telephony, use of the term "circuit" is generally limited to a telecommunication circuit with associated terminating equipment directly connecting two switching devices or exchanges. Note 3 - A telecommunication circuit does not necessarily permit simultaneous transmission in both directions. Note 4 - The "go" and "return" channels may be permanently associated together or may be selected from separate sets for asso- ciation together throughout a call. Note 5 - The term circuit may be preceded by other qualifiers than telecommunication, e.g., telephone, digital, etc. 0015 telephone circuit F: circuit telephonique S: circuito telefonico A permanent electrical connection permitting the establishment of a telephone communication in both directions between two tele- phone exchanges. 02.06 0016 hypothetical reference circuit (nominal maximum cir- cuit) F: circuit fictif de reference S: circuito ficticio de referencia (circuito maximo nomi- nal) A hypothetical circuit having a defined length and a defined amount of terminal and intermediate equipment, these quantities being reasonably large but not extreme. Such a conception is of value in the study of certain characteristics (noise, for example) of long-distance circuits. 02.08 0017 virtual circuit F: circuit virtuel S: circuito virtual A capability in the network between two users that is avail- able to them for exchanging packets of data. 0018 permanent virtual circuit F: circuit virtuel permanent S: circuito virtual permanente A capability in the network between two users that is continu- ously available to them for exchanging packets of data. 0019 (electric) circuit F: circuit (electrique) S: circuito (electrico) A region of electrical action where such action takes place essentially along a path and can be uniquely specified in terms of time and a single dimension. Note - In contradistinction, an "electric field" implies action which can only be specified uniquely in terms of time and two or three dimensions. 02.01 | ) 0020 . | | circuit (specific function) F: circuit de . | | S: circuito de . | | Part of an installation forming (or able to form part of) an electric circuit traversed by a current having a definite function, specified in each case, (example: calling, speaking, feeding, etc.). 02.01 | ) 0022 circuit group F: faisceau de circuits S: haz de circuitos A group of circuits which are traffic-engineered as a unit. 0023 circuit sub-group F: sous-faisceau de circuits S: subhaz de circuitos A number of circuits with similar characteristics (e.g. type of signalling, type of transmission path, etc.). It is not engineered as a unit, but as a part of a circuit group. Circuit sub-groups are provided for reasons of service, protection, equipment limitation, maintenance, etc. 0026 path, telecommunication path F: itineraire, itineraire de telecommunications S: trayecto, trayecto de telecomunicacion The continuous course taken by a transmission signal between two points. Note 1 - This may be a physical transmission medium, a fre- quency band in a frequency multiplex, a time slot in a time division multiplex, etc. Note 2 - The path includes the transmission media and the means used for connecting them together. 0031 link F: liaison S: enlace A telecommunication path with specified characteristics between two points. Note - The nature of the specified characteristics may be added in the form of a qualifier, e.g., digital link, co-axial link, radio link. 0040 signal (general sense) F: signal | (sens general) S: se~al | (sentido general) Aggregate of waves propaged along a transmission channel and intended to act on a receiving unit. Note - "General sense" applies only to the area of telecom- munications. The ordinary dictionary sense is still wider, viz: "A preconcerted or intelligible sign conveying information or direc- tion at a distance, a physical phenomenon or characteristic quan- tity of such a phenomenon whose time variations represent informa- tion, etc." 0041 signal (in signalling applications) F: signal | (applications concernant la signalisation) S: se~al | (en aplicaciones de se~alizacion) A transferable element of information relating to a particular circuit, a particular transaction or to the network management. Note 1 - A signal as defined above may be generated by a change of state. Note 2 - A qualification may precede the term, e.g. "answer signal". The qualification represents the name of the signal and generally refers to the kind of information the signal conveys or its main function. A great many of such qualifications are defined in standard signalling system's specifications. 0042 forward signal F: signal en avant S: se~al hacia adelante A signal, used for the establishment, release or other control of a connection sent in the same direction as call set-up. 0046 backward signal F: signal en arriere S: se~al hacia atras A signal, used for the establishment, release or other control of a connection, sent in the opposite direction to call set-up. 0050 subscriber's line F: ligne d'abonne S: linea de abonado The telephone line connecting the subscriber's equipment to the exchange. 0060 process (in a data processing system) F: processus | (dans un traitement de l'information) S: proceso | (en un sistema de procesamiento de datos) A course of events occurring according to an intended purpose or effect. (10.01.03 in ISO/TC97/SC1/515, Nov. 1975) 0063 bidirectional F: bidirectionnel S: bidireccional A qualification which implies that the transmission of infor- mation occurs in both directions. 0064 unidirectional F: unidirectionnel S: unidireccional A qualification which implies that the transmission of infor- mation always occurs in one direction. 0066 space division F: repartition dans l'espace, repartition spatiale S: division en el espacio; division espacial The separation in the space domain of a plurality of transmis- sion channels between two points. 0067 time division F: repartition dans le temps, repartition temporelle S: division en el tiempo; division temporal The separation in the time domain of a plurality of transmis- sion channels between two points. 0068 frequency division F: repartition en frequence, repartition frequentielle S: division de frecuencia The separation in the frequency domain of a plurality of transmission channels between two points. 0069 code division F: repartition en code S: division por codigo The separation of a plurality of transmission channels by using specific values of codes belonging to the same set. 0075 flag F: fanion S: bandera The unique pattern on the signalling data link used to delimit a signal unit. 0080 packet switched data transmission service F: service de transmission de donnees a commutation par paquets S: servicio de transmission de datos con conmutacion de paquetes A service involving the transmission and, if necessary, the assembly and disassembly of data in the form of packets. 0081 user packet F: paquet d'usager S: paquete de usuario A data packet exchanged between users. 0083 packet switching F: commutation par paquets S: conmutacion de paquetes The function of handling, routing, supervising and controlling user packet data, as required, by an exchange. 0085 packet handling F: traitement des paquets S: manejo (tratamiento) de paquetes The function of receiving and transmitting user packets between a user and a packet switching function. 0086 packet mode operation F: fonctionnement en mode paquet S: funcionamiento (operacion) en modo paquete The transmission of data by means of addressed packets whereby a transmission channel is occupied for the duration of the transmission of the packet only. The channel is then available for use by packets being transferred between different data terminal equipments. 0087 packet mode operation (in switching applications) F: fonctionnement en mode paquet | (dans les applications de commutation) S: funcionamiento (operacion) en modo paquete | (en apli- caciones de conmutacion) The function of handling user packets is an exchange. 0105 functional unit F: unite fonctionnelle S: unidad funcional An entity of hardware or software, or both, capable of accom- plishing a special purpose. ISO 10.01.01 .bp 0108 traffic-carrying device F: organe de trafic S: dispositivo de curso de trafico Functional unit used directly or indirectly during the estab- lishment and sustaining of a connection. 0112 (network) resource(s) F: ressource(s) (du reseau) S: recurso(s) (de la red); organo de la red Means of supplying a want or a stock that can be drawn on. In context with the telecommunication network, in particular switching devices, circuit groups, echo and loss control devices, devices for sending recorded announcements, traffic service positions, network integrated data banks, etc. 0115 software F: logiciel S: soporte logico (software) Computer programs, procedures, rules and any associated docu- mentation concerned with the operation of a system. 0120 processor F: processeur S: procesador A device capable of performing systematic execution of opera- tions upon data. In telecommunication applications, the operations include control of the resources required to provide services. 0124 operation and maintenance centre processor F: processeur de centre d'exploitation et de maintenance S: procesador de centro de operacion y mantenimiento A centralized processor for operation and maintenance purposes which serves one or more switching centres. 0150 route F: route S: ruta a) the means of transmission (paths, links via wire, cable, radio) used or to be used for the set-up of permanent or switched connections between two locations; b) the way within a network followed or to be fol- lowed for the transmission of a message or the set-up of a call between two locations. Note - Two or more routes may be used in tandem. The whole way between the end points then again is called route. 0151 routing F: acheminement S: encaminamiento a) the process of determining and using, in accor- dance with a set of rules, the route for the transmission of a mes- sage or the set-up of a call. The process ends when the message or the call has reached the destination location; b) a qualification implying the above process, e.g.: - call routing; - message routing; - traffic routing. 0205 seizure F: prise S: toma A successful bid. With "bid": a single attempt to obtain the service of a resource. 0208 busy F: occupation S: ocupado Condition of a resource which is in use, following its seizure for the time until it is released. 0209 engaged test (UK); busy test (USA) F: test d'occupation S: prueba de ocupacion An engaged test is a test made to find out whether or not cer- tain facilities which may be desired, such as a subscriber's line or trunk, are available for use. 17.66 busy test F: test d'occupation S: prueba de ocupacion A procedure for determining whether a traffic carrying device is free and available for use. 0212 release F: liberation S: liberacion The sequence of events which brings about the end of a busy state. 0215 one-way F: a sens unique S: en un solo sentido A qualification applying to traffic which implies that call set-ups always occur in one direction. 0216 both-way F: a double sens S: en ambos sentidos A qualification applying to traffic which implies that call set-ups occur in both directions. Note - The amount of traffic flowing in the two directions is not necessarily equal either in the short term or in the long term. 0221 random errors F: erreurs aleatoires S: errores aleatorios Errors distributed over the digital signal so that they can be considered statistically independent from each other. 0222 error burst F: paquet d'erreurs S: rafaga de errores A group of bits in which two successive erroneous bits are always separated by less than a given number (x ) of correct bits. The number x should be specified when describing an error burst. Note - The last erroneous bit in a burst and the first erroneous bit in the following burst are accordingly separated by x correct bits or more. 0225 bit error ratio F: taux d'erreur sur les bits S: tasa de errores en los bits; tasa de error en los bits The ratio of the number of digital errors received in a speci- fied period to the total number of digits received in the same period. Note 1 - Numerical values of error ratio should be expressed in the form n | (mu | 0DlF261 p where p is a positive integer. Note 2 - Error ratio may be qualified, for example by the term "bit" or "block". 0226 cyclic redundancy check (or procedure) F: contr | le (ou procedure) de redondance cyclique S: verificacion por redundancia ciclica (procedimiento de) The monitoring of a digital bit stream to detect deviations from the expected bit patterns. 0230 delay distortion F: distorsion de temps de propagation S: distorsion por retardo Deviation in delay from a reference or an expected value for signals of various frequencies. 0231 group delay F: temps de propagation de groupe S: retardo de grupo The time of propagation between two points of a certain point (for example the crest) of the envalope of a wave. For a given frequency it is equal to the first derivative of the phase shift measured in radians, between these points, with reference to the angular frequency measured in radians per second. 0232 crosstalk F: diaphonie S: diafonia Electrical interference between non-connected components. 0301 first-order digital transmission hierarchy F: hierarchie de transmission numerique du premier ordre S: jerarquia de transmision digital de primera orden Digital signals multiplexed to the 1544 or 2048 kbit/s level (Primary level) for digital transmission. 0302 second-order digital transmission hierarchy F: hierarchie de transmission numerique du deuxieme ordre S: jerarquia de transmision digital de segundo orden Digital signals multiplexed to the 6312 or 8448 kbit/s level for digital transmission. 0311 first-order multiplexes (Suggest that term should be, "First-order multiplexed signals") F: multiplex du premier ordre S: multiplex de primer orden Digital signals that have been multiplexed into 1544 or 2048 kbit/s bit streams. 0312 second-order multiplexes (Same comment as above) F: multiplex du deuxieme ordre S: multiplex de segundo orden Digital signals that have been multiplexed into 6312 or 8448 kbit/s bit streams. 0400 pilot F: onde pilote S: piloto Sinusoidal signal transmitted over analogue FDM links for regulation and supervision purposes. 1 Switching functions and techniques 1001 exchange (switching exchange, switching centre) F: centre - central (centre ou central de commutation) S: central (central de conmutacion, centro de conmutacion) An aggregate of traffic carrying devices, switching stages, controlling and signalling means at a network node that enables subscriber lines and/or other telecommunication circuits to be interconnected as required by individual users. (See Figure 1/Q.9.) 1002 local exchange [local central office] F: central urbain S: central local An exchange in which subscribers' lines terminate. (See Figure 1/Q.9.) 15.02 1003 transit exchange [tandem exchange, tandem central office, tandem office] F: centre de transit S: central de transito An exchange used primarily as a switching point for traffic between other exchanges. (See Figure 1/Q.9.) 15.04 1004 combined local/transit exchange F: centre mixte urbain et de transit S: central combinada local/de transito An exchange in which subscribers' lines terminate that also is used as a switching point for traffic between other exchanges. (See Figure 1/Q.9.) Figure 1/Q.9, p. 1005 international exchange F: centre international S: central internacional A transit exchange where international circuits and, in gen- eral, national circuits terminate. 1007 geographically distributed exchange [geographically dispersed exchange] F: centre geographiquement disperse S: central geograficamente distribuida An exchange where not all sub-systems such as switching stages and control means are at the same location. (See Figure 1/Q.9.) 1008 remotely controlled exchange F: centre telecommande S: central controlada a distancia; central telecontrolada An exchange whose switching functions are wholly or partially controlled by a control unit or a processor in another location. (See Figure 1/Q.9.) 1010 digital exchange F: centre numerique S: central digital An exchange that switches information in digital form through its switching devices. 1011 integrated services exchange F: central avec integration des services S: central de servicios integrados An exchange arranged to handle multiple services such as tele- phone and data using all or part of the switching, signalling and control devices in common. 1013 satellite exchange F: centre satellite S: central satelite A local exchange on a low level of the network hierarchy which is associated to another exchange and with no route switching func- tions except those towards the associated higher level local exchange. A satellite exchange has normally the capability to con- nect locally subscribers' lines terminating in it. (See Figure 1/Q.9.) 1015 switching stage F: etage de commutation S: etapa de conmutacion An aggregate of switching devices constituting a subset of the switching network in an exchange and designed to operate as a sin- gle unit from a traffic handling point of view. (See Figure 1/Q.9.) 1016 remote switching stage F: etage de commutation distant S: etapa de conmutacion distante A switching stage associated with and controlled by an exchange in a different location. (See Figure 1/Q.9.) 1018 exchange concentrator F: concentrateur de central S: concentrador de central A switching stage wherein a number of subscriber lines or inter-exchange circuits carrying relatively low traffic volumes can be through-connected to a few number of circuits carrying higher traffic volumes. (See Figure 1/Q.9.) 1019 co-located exchange concentrator F: concentrateur de central local S: concentrador de central local A concentrator in the same location as the exchange that con- trols it and to which its higher traffic volume circuits are con- nected. (See Figure 1/Q.9.) 1020 remote exchange concentrator F: concentrateur de central distant S: concentrador de central distante A concentrator located remotely from the exchange that con- trols it and to which its higher traffic volume circuits are con- nected. The switching stages comprised normally have no capability to directly interconnect subscriber lines terminating in that con- centrator. (See Figure 1/Q.9.) 1025 line concentrator (stand-alone concentrator) F: concentrateur de lignes (concentrateur autonome) S: concentrador de lineas (concentrador autonomo) A switching device which concentrates traffic from a number of circuits or subscribers' lines onto a smaller number of circuits to a parent local exchange, where a similar switching device deconcen- trates the traffic to the original number of lines. In the case of subscribers' lines, the correspondence of the lines before concen- tration and after deconcentration must be maintained. The system is both-way working, i.e., traffic from the exchange is concentrated onto the same circuits and deconcentrated to the subscribers as well. (See Figure 1/Q.9.) 1030 semi-automatic system F: systeme semi-automatique S: sistema semiautomatico A system in which the calling subscriber's order is given to an operator who completes the call through automatic switches. 16.19 1031 automatic system F: systeme automatique S: sistema automatico A system in which the switching operations are performed by electrically controlled devices without the intervention of opera- tors. 16.20 1105 inlet F: acces d'arrivee S: entrada (en conmutacion); acceso de entrada Point through which the incoming traffic flow enters a switch- ing stage. 1106 outlet F: acces de depart S: salida (en conmutacion); acceso de salida Point through which the outgoing traffic flow leaves a switch- ing stage, or device. 1110 switching F: commutation S: conmutacion (1) The establishing, on demand, of an individual connection from a desired inlet to a desired outlet within a set of inlets and outlets for as long as is required for the transfer of information. (2) A qualification implying the action as defined above, e.g.: switching centre switching network switching delay switching node switching device switching point switching equipment switching system switching exchange switching unit switching matrix 1111 switching node F: noeud de commutation S: nodo de conmutacion An interstitial point in a telecommunication network where temporary interconnection of inlets and outlets may be undertaken as required. 1112 switching network F: reseau de commutation S: red de conmutacion The switching stages of a telecommunication exchange taken collectively. 1113 switching matrix F: matrice de commutation S: matriz de conmutacion An array of crosspoints in a space division exchange which, from a traffic point of view, operates as a switch. 1115 selection stage F: etage de selection S: etapa de seleccion An aggregate of switches enabling an inlet to access one of a plurality of outlets and designed to operate as a single unit from a traffic handling point of view. 1117 concentration (in a switching stage) F: concentration S: concentracion A configuration wherein the number of inlets into the switch- ing stage is larger than the number of outlets. 1118 expansion (in a switching stage) F: expansion S: expansion A configuration wherein the number of inlets into the switch- ing stage is smaller than the number of outlets. 1120 digital switching F: commutation numerique S: conmutacion digital A process in which connections are established by operations on digital signals without converting them to analogue signals. 1121 digital node, digital switching node F: point nodal numerique, point nodal de commutation numerique S: nodo digital, nodo de conmutacion digital A point at which digital switching occurs. 1122 digital circuit F: circuit numerique S: circuito digital A circuit which transmits information signals in digital form between two exchanges. It includes termination equipment but not switching stages. 1123 digital link F: liaison numerique S: enlace digital A means of digital transmission between two points. 1125 circuit switching F: commutation de circuits S: conmutacion de circuitos The switching together of circuits to form a connection which is used for the duration of a call. 1126 space division switching F: commutation par repartition dans l'espace (commutation spatiale) S: conmutacion por division en el espacio; conmutacion espacial The switching of inlets to outlets using space division tech- niques. 1127 time division switching F: commutation par repartition dans le temps (commutation temporelle) S: conmutacion por division en el tiempo; conmutacion temporal The switching of inlets to outlets using time division (multi- plexing) techniques. 1128 frequency division switching F: commutation par repartition en frequence S: conmutacion por division de frecuencia The switching of inlets to outlets using frequency division (multiplexing) techniques. 1129 channel switching F: commutation de voies S: conmutacion de canales The switching together of single channels to form a connection which is used for the duration of a call. 1130 message switching; store-and-forward switching F: commutation de messages; commutation avec enregistre- ment et retransmission S: conmutacion de mensajes; conmutacion con almacenamiento y reenvio The process of routing messages comprising, in certain nodes of the network, a receiving, storing as necessary, and forwarding of messages within a telecommunication network so as to minimize queue and idle times of traffic carrying devices. 1132 integrated digital transmission and switching F: transmission et commutation numeriques integrees S: transmision y conmutacion digitales integradas The direct (digital) concatenation of digital transmission and digital switching, that maintains a continuous digital telecommuni- cation path. 1134 exchange connection F: connexion de commutateur S: conexion de central A connection that is established through an exchange, between the terminations on that exchange, of two or more circuits or chan- nels. 1135 digital connection F: connexion numerique S: conexion digital An association of digital circuits, digital switches and other functional units providing means for the transfer of digitally encoded information signals between two terminal points. 1136 multislot connection F: connexion a intervalles de temps multiples S: conexion multiintervalo Time slots associated with two or more digital circuits switched in parallel through a digital exchange for use on the same call to provide a wideband service. 1137 trombone (loop) connection F: connexion en boucle S: conexion en bucle The use for a single call of two circuits in tandem between a remote switching stage and its controlling entity. 1138 semi-permanent connection F: connexion semi-permanente S: conexion semipermanente A connection established part-time and on a scheduled basis for the use of one user. At other times the connection may be released and available for use in handling traffic of the switched network. 1139 transit connection F: connexion de transit S: conexion de transito An exchange connection for a call incoming from one interex- change circuit and outgoing on another. 1140 originating connection F: connexion de depart S: conexion de origen An exchange connection for a call originating on a subscriber line or access channel outgoing to an interexchange circuit. 1141 terminating connection F: connexion d'arrivee S: conexion de destino; conexion de terminacion An exchange connection for a call incoming from an interex- change circuit and terminating on a subscriber line or channel. 1142 internal connection F: connexion interne S: conexion interna An exchange connection for a call between subscriber lines or channels on the same exchange. 1143 through connection F: transfert S: transconexion The processes performed by control and switching equipment in order to establish an exchange connection. 1144 asymmetrical through connection F: transfert asymetrique S: transconexion asimetrica The through connection of only one direction of transmission on a potential both-ways through connection. 1145 symmetrical through connection F: transfert symetrique S: transconexion simetrica The through connection of both directions of transmission simultaneously. 1147 input connection F: connexion d'entree S: conexion de entrada An unidirectional path from an interface of a digital exchange to an exchange test point. 1148 output connection F: connexion de sortie S: conexion de salida An unidirectional path from an exchange test point to an interface of a digital exchange. 1149 half connection F: demi-connexion S: semiconexion A bi-directional path comprised of an input connection and an output connection, both having the same exchange interface. Note 1 - These terms may be qualified by the words analogue or digital, the qualification signifying the property of the exchange interface. Note 2 - An analogue input (output) (half) connection may be further qualified by the words 2-wire or 4-wire. 1160 exchange termination (ET) F: terminaison de commutateur (TC) S: terminacion de central (TC) The unit or function on the exchange side of the switching/transmission interface. See Figure 2/Q.9. Figure 2/Q.9, p. 1161 line termination (LT) F: terminaison de ligne (TL) S: terminacion de linea (TL) Group or functional block containing at least the transmit and receive functions terminating one end of a digital transmission system. See Figure 2/Q.9. 1163 interface units F: unites d'interface S: unidades de interfaz Units of an exchange on which lines and/or interexchange cir- cuits are terminated, and which are involved in the processing of traffic to/from those lines and/or circuits. 1165 mediation device F: dispositif de mediation S: dispositivo de mediacion A unit or function that is situated between a Network Element and an Operations System in the Telecommunications Management Net- work that translates the information flow between the two entities as required, provides multiplexing, etc. 1166 muldex F: muldex S: muldex A contraction of multiplexer-demultiplexer. The term may be used when the multiplexer and demultiplexer are associated in the same equipment. Note - When used to describe an equipment, the function of the equipment should qualify the title, e.g., PCM muldex, data mul- dex, digital muldex. 1167 primary muldex F: muldex primaire S: muldex primario A digital multiplexer-demultiplexer that converts signals between 64 kbit/s and 1544 or 2048 kbit/s bit streams. See Figure 2/Q.9. 1168 tertiary digital muldex F: muldex numerique tertiaire S: muldex digital terciario A digital multiplexer-demultiplexer that converts signals between 64 kbit/s and 34 | 68 kbit/s bit streams. See Figure 2/Q.9. 1169 static multiplex F: multiplex statique S: multiplex estatico Digital bit streams between reference points into which lower bit rate channels have been combined, each into an assigned channel or slot. 1170 two-wire switching F: commutation a deux fils S: conmutacion a dos hilos Switching using the same path, frequency band or time interval for both directions of transmission. 1171 four-wire switching F: commutation a quatre fils S: conmutacion a cuatro hilos Switching using a separate path, frequency band or time inter- val for each direction of transmission. 1176 reentrant trunking F: jonction reentrante S: enlace reentrante The routing of a circuit from outlet to inlet in a switching stage in order to access equipment associated with special services such as operators, auxiliary equipment, etc. Note - Not to be confused with the action of mutual help where the purpose of re-entering the call is to attempt to reduce the probability of switching congestion on a given call by allowing a new possibility of choice of path from the new inlet to a trunk in the desired route. 1178 multiple F: multiplage S: multiple Interconnection of several inlets or outlets in a switching stage to the same traffic carrying device (e.g., other switching stage or circuit). 1205 crossbar system F: systeme automatique "crossbar" S: sistema de barras cruzadas An automatic switching system in which the selecting mechan- isms are crossbar switches . 16.26 1206 junctor (in the crossbar system) F: joncteur S: conector In crossbar systems, a junctor is a circuit extending between frames of a switching unit and terminating in a switching device on each frame. 15.68 1207 link (in the crossbar system) F: maillon S: enlace A link is a circuit extending between the primary and secon- dary selectors of a selection stage. 15.69 1210 register F: enregistreur S: registrador The apparatus, in an automatic system, which receives the dialled impulses and controls the subsequent switching operations. 15.56 .bp 1212 translation F: traduction S: traduccion In automatic telephony: the retransmission of received trains of impulses after changing the number of impulses in each train and/or changing the number of trains. 15.58 1213 translator F: traducteur S: traductor In automatic telephony: a device used for the translation of trains of impulses. 15.57 1305 (time division) highway (in switching); bus (USA) F: canal (a multiplexage dans le temps) S: arteria; canal principal (por division en el tiempo) (en conmutacion) A common path within an apparatus or station over which sig- nals from a plurality of channels pass, separated by time division. 1310 character signal F: signal de caractere S: se~al de caracter A set of signal elements representing a character, or in PCM representing the quantized value of a sample. Note - In PCM, the term "PCM word" may be used in this sense. 1314 quiet code F: code silencieux S: codigo de calma A digital signal used for transmission test purposes. 1315 cross-exchange check (cross-office) F: verification du trajet dans le central S: verificacion a traves de la central A check made across the exchange to verify that a speech path exists. 1319 in-call rearrangement F: remaniement des liaisons pendant la communication S: reestructuracion en comunicacion Reassignment of the switched path during the call. 1330 channel gate F: porte de voie S: puerta de canal A device for connecting a channel to a highway, or a highway to a channel, at specified times. 1331 primary block; digroup (USA) F: bloc primaire S: bloque primario A basic group of PCM channels assembled by time division mul- tiplexing. Note - The following conventions could be useful: Primary block u - a basic group of PCM channels derived from 1544 kbit/s PCM multiplex equipment. Primary block A - a basic group of PCM channels derived from 2048 kbit/s PCM multiplex equipment. 1332 frame F: trame S: trama A set of consecutive digit time slots in which the position of each digit time slot can be identified by reference to a frame alignment signal. The frame alignment signal does not necessarily occur, in whole or in part, in each frame. 1333 multiframe F: multitrame S: multitrama A set of consecutive frames in which the position of each frame can be identified by reference to a multiframe alignment sig- nal. The multiframe alignment signal does not necessarily occur, in whole or in part, in each multiframe. 1334 subframe F: secteur de trame - sous-trame S: subtrama A sequence of noncontiguous sets of digits assembled within a frame, each set occurring at n times the frame repetition rate where n is an integer > | . 1335 parallel to serial converter; serializer (USA) [dynam- icizer] F: convertisseur parallele/serie S: convertidor paralelo/serie A device that converts a group of digits, all of which are presented simultaneously, into a corresponding sequence of signal elements. 1336 serial to parallel converter; deserializer (USA) [sta- ticizer] F: convertisseur serie/parallele S: convertidor serie/paralelo A device which converts a sequence of signal elements into a corresponding group of digits, all of which are presented simul- taneously. 1337 u/A law converter F: convertiseur loi u/loi A S: convertidor de ley u/A A unit or a function that changes digital signals encoded using either u or A-law encoding into the corresponding signal for the other. 1405 frame alignment F: verrouillage de trame S: alineacion de trama The state in which the frame of the receiving equipment is correctly phased with respect to that of the received signal. 1406 frame alignment signal F: signal de verrouillage de trame S: se~al de alineacion de trama The distinctive signal used to secure frame alignment; this signal does not necessarily occur, in whole or in part, in each frame. 1407 bunched frame alignment signal F: signal de verrouillage de trame concentre S: se~al de alineacion de trama concentrada A frame alignment signal in which the signal elements occupy consecutive digit time slots. 1408 distributed frame alignment signal F: signal de verrouillage de trame reparti S: se~al de alineacion de trama distribuida A frame alignment signal in which the signal elements occupy non-consecutive digit time slots. 1409 frame alignment recovery time F: temps de reprise du verrouillage de trame S: tiempo de recuperacion de la alineacion de trama The time that elapses between a valid frame alignment signal being available at the receive terminal equipment and frame align- ment being established. Note - The frame alignment recovery time includes the time required for replicated verification of the validity of the frame alignment signal. 1410 out-of-frame alignment time F: duree de perte du verrouillage de trame S: duracion de la perdida de alineacion de trama The time during which frame alignment is effectively lost. That time will include the time to detect loss of frame alignment and the alignment recovery time. 1414 time slot F: intervalle de temps S: intervalo de tiempo Any cyclic time interval that can be recognized and defined uniquely. 1415 channel time slot F: intervalle de temps de voie S: intervalo de tiempo de canal A time slot starting at a particular phase in a frame and allocated to a channel for transmitting a character signal and pos- sibly in-slot signalling or other information. Note - Where appropriate a description may be added, for example "telephone channel time slot". 1416 signalling time slot F: intervalle de temps de signalisation S: intervalo de tiempo de se~alizacion A time slot starting at a particular phase in each frame and allocated to the transmission of signalling. 1417 frame alignment time slot F: intervalle de temps de verrouillage de trame S: intervalo de tiempo de alineacion de trama A time slot starting at a particular phase in each frame and allocated to the transmission of a frame alignment signal. 1418 digit time slot F: intervalle de temps pour element numerique S: intervalo de tiempo de digito A time slot allocated to a single digit. 1419 bit integrity F: integrite des bits S: integridad de los bits; integridad de la secuencia de bits Exists when the values of the bits in each octet of a digital bit stream at the output of a device or system are unchanged from those at the input. Note - Digital processing devices such as A/u law converters, echo suppressors and digital pads must be disabled to provide bit integrity. 1420 octet sequence integrity F: integrite de la suite des octets S: integridad de la secuencia de octetos The property of a digital transmission channel, telecommunica- tion circuit or connection that permits a digital signal to be con- veyed over it without change to the order of any octets. 1421 time slot sequence integrity F: integrite de la sequence des intervalles de temps S: integridad de la secuencia de intervalos de tiempo The assurance that the digital information contained in the n time slots of a multislot connection arrives at the output (or ter- minal) in the same sequence as it was introduced. 1422 time slot interchange F: echange entre intervalles de temps S: intercambio de intervalos de tiempo The transfer of information from one time slot to another between incoming and outgoing time division highways. 1425 retiming F: reajustement du rythme S: reajuste de la temporizacion Adjustment of the intervals between corresponding significant instants of a digital signal, by reference to a timing signal. 1426 timing recovery (timing extraction) F: recuperation du rythme S: recuperacion de la temporizacion (extraccion de la temporizacion) The derivation of a timing signal from a received signal. 1428 bit timing F: rythme des bits S: temporizacion de los bits Timing information sent from the Exchange Termination used by the Line Termination to recover information from the digital bit stream. In the definitions, "signal" is taken with the general meaning of Definition 02.27. For information, Definition 02.27 is reproduced below: 02.27 signal (general sense) Aggregate of waves propagated along a transmission channel and intended to act on a receiving unit. 1430 synchronous F: synchrone S: sincrono Signals are synchronous if their corresponding significant instants have a desired phase relationship with each other. 1431 synchronization F: synchronisation S: sincronizacion The process of adjusting the corresponding significant instants of signals to make them synchronous. 1434 plesiochronous F: plesiochrone S: plesiocrono Signals are plesiochronous if their corresponding significant instants occur at nominally the same rate, any variation in rate being constrained within specified limits. In these definitions "clock" is taken with the general meaning of Definition 51.10 and it is assumed that where replicated sources are used for security reasons, the assembly of these is regarded as being a single clock. For information, Definition 51.10 is repro- duced below: 51.10 clock Equipment providing a time base used in a transmission system to control the timing of certain functions such as the control of the duration of signal elements, the sampling, etc. Note 1 - Two signals having the same nominal digit rate, but not stemming from the same clock or homochronous clocks, are usu- ally plesiochronous. Note 2 - There is no limit to the phase relationship between corresponding significant instants. 1446 synchronized network [synchronous network] F: reseau synchronise | [reseau synchrone] S: red sincronizada | [red sincrona] A network in which the corresponding significant instants of nominated signals are adjusted to make them synchronous. Note - Ideally the signals are synchronous, but they may be mesochronous in practice. By common usage such mesochronous net- works are frequently described as synchronized. 1447 nonsynchronized network F: reseau non synchronise S: red no sincronizada A network in which the corresponding significant instants of signals need not be synchronized or mesochronous. 1450 hierarchic (mutually synchronized) network F: reseau hierarchise (a synchronisation mutuelle) S: red jerarquica (mutuamente sincronizada) A mutually synchronized system in which some clocks exert more control than others, the network operating frequency being a weighted mean of the natural frequencies of the population of clocks. 1505 transmission delay (through a digital exchange) F: temps de transmission | (dans un central numerique) S: tiempo de transmision | (a traves de una central digi- tal) The sum of the times necessary for an octet to pass in both directions on a connection through a digital exchange due to buffering, frame alignment and time-slot interchange functions for digital-to-digital connections and in addition, for analogue-to-analogue connections, to the A/D conversions. 1506 switching delay (processing (handling) time) F: temps de commutation (temps de traitement) S: tiempo de conmutacion (tiempo de proceso (tratamiento)) The interval of time attributable to the functions performed in a switching exchange in the process of setting up a call. 1507 incoming response delay F: temps de reponse a la prise d'un circuit d'arrivee S: duracion de la preseleccion A characteristic that is applicable where channel associated signalling is used. It is defined as the interval from the instant an incoming circuit seizure signal is recognizable until a proceed-to-send signal is sent backwards by the exchange. 1508 exchange call set-up delay F: temps d'etablissement de la communication dans le cen- tral S: tiempo de establecimiento de la comunicacion por una central The interval from the instant when the digits required for setting up a call are available in the exchange or the address information is received at the incoming signalling data transmis- sion control of the exchange to the instant when the seizing signal is sent to the subsequent exchange or the corresponding address information is sent from the outgoing signalling data transmission control. 1510 through-connection delay F: temps de transfert S: demora de transconexion; tiempo de transferencia de la central The interval from the instant at which the information required for setting up a through-connection in an exchange is available for processing in the exchange to the instant that the switching network through-connection is established and available for carrying traffic between the incoming and outgoing 64-kbit/s circuits. 1512 exchange call-release delay F: temps de liberation de la communication par le central S: tiempo de liberacion de la comunicacion (llamada) por una central Exchange call release delay is the interval from the instant at which the last information required for releasing a call in an exchange is available for processing in the exchange to the instant that the switching network through-connection is no longer avail- able between the incoming and outgoing 64-kbit/s circuits and the disconnection signal is sent to the subsequent exchange. This interval does not include the time taken to detect the release sig- nal, which might become significant during certain failure condi- tions, e.g. transmission system failures. 1514 post-dialling delay F: delai d'attente apres numerotation S: periodo de espera despues de marcar Time interval between the end of dialling by the subscriber and the reception by him of the appropriate tone or recorded announcement, or the abandon of the call without tone. 1517 engineered exchange capacity F: capacite dimensionnee de commutateur S: capacidad de la central establecida en el dise~o The maximum traffic load that an exchange can handle while meeting specified performance requirements, and performing all nor- mal operational and administrative functions, without entering into an overload condition. 1520 overload F: surcharge S: sobrecarga That part of the total load offered to an exchange in excess of the engineered exchange capacity. 1551 basic access (ISDN basic access) F: acces de base (acces de base RNIS) S: acceso basico (acceso basico RDSI) A user-network access arrangement that corresponds to the interface structure composed of two B-channels and one D-channel. The bit rate of the D-channel for this type of access is 16 kbit/s. 1552 primary rate access F: acces au debit primaire S: acceso a velocidad primaria A user-network access arrangement that corresponds to the pri- mary rates of 1544 kbit/s and 2048 kbit/s. The bit rate of the D-channel for this type of access is 64 kbit/s. 1560 reference point F: point de reference S: punto de referencia A conceptual point at the conjunction of two non-overlapping functional groups. Note - Each reference point is assigned a prefix letter, for example: T reference point. 1561 V-interface F: interface V S: interfaz V A digtal exchange interface for subscriber access which coin- cides with the V reference point. Note 1 - A specific V interface is denoted by a suffix number. Note 2 - The V interfaces are internal network interfaces. 2 Signalling functions and techniques 2.0 Basic signalling terms and techniques 2001 signalling F: signalisation S: se~alizacion a) The exchange of information (other than by speech) specifically concerned with the establishment, release and other control of calls, and network management, in automatic telecommunications operation. b) A qualification implying an action as defined above, e.g.: signalling channel signalling procedure signalling equipment signalling relation signalling information signalling route signalling link signalling system signalling message signalling time slot 2004 speech digit signalling F: signalisation par elements numeriques vocaux S: se~alizacion por digitos de conversacion A type of channel-associated signalling in which digit time slots primarily used for the transmission of encoded speech are periodically used for signalling. 2005 in-slot signalling F: signalisation dans l'intervalle de temps S: se~alizacion dentro del intervalo Signalling associated with a channel and transmitted in a digit time slot permanently (or periodically) allocated in the channel time slot. 2006 out-slot signalling F: signalisation hors intervalle de temps S: se~alizacion fuera del intervalo Signalling associated with a channel but transmitted in one or more separate digit time slots not within the channel time slot. 2008 common channel signalling F: signalisation sur voie commune (signalisation par canal semaphore) S: se~alizacion por canal comun A signalling technique in which signalling information relat- ing to a multiplicity of circuits, and other information such as that used for network management, is conveyed over a single channel by addressed messages. 2009 channel associated signalling F: signalisation voie par voie S: se~alizacion asociada al canal A signalling method in which the signals necessary for the traffic carried by a single channel are transmitted in the channel itself or in a signalling channel permanently dedicated to it. 2010 in-band signalling F: signalisation dans la bande S: se~alizacion dentro de banda A signalling method in which signals are sent over the same transmission channel or circuit as the user's communication and in the same frequency band as that provided for the users. 2011 out-band signalling F: signalisation hors bande S: se~alizacion fuera de banda A signalling method in which signals are sent over the same transmission channel or circuit as the user's communication but in a different frequency band from that provided for the users. 2012 line signalling F: signalisation de ligne S: se~alizacion de linea A signalling method in which signals are transmitted between equipments which terminate and continuously monitor part or all of the traffic circuit. 2013 register signalling (Signalling System R1) F: signalisation entre enregistreurs S: se~alizacion entre registradores Link-by-link multifrequency (MF) in-band pulse signalling is used for the transmission of address information. The signalling frequencies are 700 Hz to 1700 Hz, in 200 Hz steps, and combina- tions of two, and two only, determine the signal. The address information is preceded by a KP signal (start-of-pulsing) and ter- minated by an ST signal (end-of-pulsing). Either en bloc, or en bloc overlap, or overlap sending may apply. This register signal- ling arrangement is used extensively with other in-band and out-band line signalling systems. 2014 link-by-link signalling F: signalisation section par section S: se~alizacion enlace por enlace A signalling method in which signals are transmitted one link at a time in a multi-link connection and requiring processing at each intermediate switching point for subsequent transmission. 2015 link-by-link signalling F: signalisation section par section S: se~alizacion enlace por enlace A procedure for the exchange of signalling information directly between two signalling points that are either directly connected or via signalling transfer points. 2017 end-to-end signalling (general sense) F: signalisation de bout en bout | (sens general) S: se~alizacion de extremo a extremo | (sentido general) A signalling method in which signals are transmitted from one end of a multi-link connection to the other end where processing of these signals is required. 2018 end-to-end signalling F: signalisation de bout en bout S: se~alizacion de extremo a extremo The capability to transfer signalling information of end point significance directly between signalling end points in order to provide a requesting user with a basic or supplementary service. 2019 end-to-end signalling F: signalisation de bout en bout S: se~alizacion de extremo a extremo A procedure for the exchange of signalling information directly between signalling entities in an originating exchange and a destination exchange for purposes of supporting certain user ser- vices. 2020 pass along method F: methode du "faire passer" S: metodo de paso de largo A method for transporting signalling messages, whereby the signalling information is sent along the signalling path of a pre- viously established physical connection. 2021 signalling system F: systeme de signalisation S: sistema de se~alizacion The procedures for the interpretation and use of a repertoire of signals together with the hardware and/or software needed for the generation, transmission, and reception of these signals. 2022 en-bloc signalling F: signalisation "en bloc" S: se~alizacion en bloque A signalling method in which the address digits are assembled into one block for onward transmission, the block containing all of the address information necessary to route the call to its destina- tion. 2023 compelled signalling (general sense) F: signalisation asservie | (sens general) S: se~alizacion de secuencia obligada | (sentido general) A signalling method in which, after one signal (or message) has been sent, the sending of any further signals (or messages) in the same direction is inhibited until the signal sent has been ack- nowledged in the opposite direction by the receiving terminal and the acknowledgement has been received. 2024 compelled signalling (fully compelled; continuous com- pelled) F: signalisation asservie (entierement asservie; con- tinuellement asservie) S: se~alizacion de secuencia obligada (totalmente obligada; continuamente obligada) A signalling method in which the signal to be transmitted as applied continuously until acknowledged or until a timeout occurs. Upon recognition of the initial signal, the acknowledgement signal is applied continuously until the cessation of the initial signal or until a timeout occurs. The cessation of the aknowledgement sig- nal may provoke the beginning of the next subsequent compelled cycle. In addition to the acknowledgement, the acknowledgement sig- nal may carry other signalling information (e.g. concerning the next cycle). 2025 overlap address signalling F: signalisation d'adresse a recouvrement S: se~alizacion de direccion con superposicion A signalling method in which the onward transmission of address signals from a switching centre may commence before the reception of all the address signals over the preceding link has been completed. 2026 overlap line signalling F: signalisation de ligne a recouvrement S: se~alizacion de linea con superposicion A signalling method in which the onward transmission of a line signal from a switching centre may commence before the recognition time of the line signal being received expires. 2030 direct current signalling (d.c. signalling) F: signalisation en courant continu S: se~alizacion en corriente continua (se~alizacion en c.c.) A signalling method in which the signalling information may be represented by controlling the direct current magnitude, polarity, and duration or a combination thereof. 2031 loop/disconnect signalling F: signalisation par ouverture de boucle S: se~alizacion por interrupcion del bucle A direct current signalling method in which the signals are represented by the breaking of a loop circuit. 2032 alternating current signalling (a.c. signalling) F: signalisation en courant alternatif S: se~alizacion en corriente alterna (se~alizacion en c.a.) A signalling method in which the signalling information is represented by means of pulsed alternating current having a fre- quency below the telephone speech band. 2033 voice-frequency signalling (VF signalling) F: signalisation a frequences vocales S: se~alizacion en frecuencia vocal (se~alizacion FV) A signalling method in which the signalling information is based on the use of currents which have frequencies within the telephone speech band. 2034 multi-frequency code signalling (MFC signalling) F: signalisation multifrequences (signalisation MF) S: se~alizacion en codigo multifrecuencia (se~alizacion CMF) A voice-frequency signalling method in which the signalling information is represented by compound signals, each consisting of n frequencies from a set of m frequencies. 2038 dual seizure F: prise simultanee S: doble toma; toma simultanea The condition which occurs when in bothway operation two exchanges attempt to seize the same circuit at approximately the same time. 2039 interruption control F: contr | le d'interruption S: proteccion contra las interrupciones A system which monitors a pilot for interruptions on FDM sys- tems and which transmits an indication to the swiching equipment. 2040 signal spillover (in VF signalling) F: partie debordante d'un signal | (dans un systeme de signalisation a frequences vocales) S: rebasamiento de se~al | (en se~alizacion FV) That part of a VF signal which passes in band from one link to the other in a multi-link connection before the connection between the links has been split at the incoming end. 2041 signal imitation (in VF signalling) F: imitation de signaux | (dans un systeme de signalisa- tion a frequences vocales) S: imitacion de se~al | (en se~alizacion FV) An unwanted signal produced within the signalling band by speech or other currents which are not genuine signals causing the response of a signal receiver. 2042 guarding (in VF signalling) F: protection | (dans un systeme de signalisation a frequences vocales) S: guarda | (en se~alizacion FV) Rendering ineffective the signal imitation by recognizing the simultaneous presence of frequencies outside the signalling band. 2043 splitting (in VF signalling) F: coupure | (dans un systeme de signalisation a frequences vocales) S: desprendimiento | (en se~alizacion FV) A switching function which provides disconnection or isolation of that part of a channel which: - preceeds the point where the signalling frequency(ies) is(are) injected; - succeeds the point where the signal receiver is connected. Splitting when receiving a signal prevents false operation of signalling equipment by signal reflections and signal spill-over. Splitting when sending a signal prevents interference from a preceding circuit or near-end equipment. 2050 signalling information F: information de signalisation S: informacion de se~alizacion The information content of a signal or a signalling message. 2051 address F: adresse S: direccion A name which indicates the source or destination of an intended instance of communication. 2052 band number F: numero de bande S: numero de banda A subdivision of the address label, containing the most signi- ficant bits, used for routing the signal message and possibly for identifying the circuit group containing the traffic circuit con- cerned. 2053 address signal F: signal d'adresse S: se~al de direccion A signal containing one element of the part of the selection signals which indicate the destination of a call initiated by a customer, network facility, etc. 2054 address signal complete F: signal d'adresse complet S: se~al de direccion completa A signal sent in the backward direction indicating that sig- nals required for routing the call to the called party have been received and that no called party's line condition signals will be sent. 2055 address-incomplete signal F: signal d'adresse incomplet S: se~al de direccion incompleta A signal sent in the backward direction indicating that the number of address signals received is not sufficient for setting up the call. 2056 end-of-pulsing (ST) signal F: signal de fin de numerotation S: se~al de fin de numeracion (SFN) An address signal sent in the forward direction indicating that there are no more address signals to follow. 2057 call-failure signal F: signal d'echec de l'appel S: se~al de llamada infructuosa A signal sent in the backward direction indicating the failure of a call set-up attempt due to the lapse of a time-out or a fault not covered by specific signals. 2058 ringing tone; ringback tone (USA) F: tonalite de retour d'appel S: tono de llamada A tone which indicates that the ringing function is being applied at the called end. 2059 release-guard signal F: signal de liberation de garde S: se~al de liberacion de guarda A signal sent in the backward direction in response to the clear-forward signal when the circuit concerned is brought into the idle condition. 2060 clear-forward signal F: signal de fin S: se~al de fin (desconexion) A signal sent in the forward direction to terminate the call or call attempt and release the circuit concerned. This signal is normally sent when the calling party clears. 2061 clear-back signal F: signal de raccrochage S: se~al de colgar A signal sent in the backward direction indicating that the called party has cleared. 2062 confusion signal F: signal de confusion S: se~al de confusion A signal sent in the backward direction indicating that an exchange is unable to act upon a message received from the preced- ing exchange because the message is considered unreasonable. 2070 message F: message S: mensaje An assembly of information within a protocol transferred as an entity in a telecommunication process. Note - Specific qualifiers may be used to indicate a particu- lar application, e.g., alarm, message. 2071 signalling message F: message (de signalisation) S: mensaje de se~alizacion An assembly of signalling information pertaining to a call, management transaction, etc., comprising also elements for delimi- tation, sequencing and error control, that is transferred as an entity. 2074 optional part F: partie facultative S: parte facultativa; parte opcional Part of a message that contains parameters that may not occur in any particular message type. Note - Other qualifiers may be used in specific applications, for example, mandatory part. 2080 initial address message (IAM) F: message initial d'adresse (MIA) S: mensaje inicial de direccion (MID) A type of message sent in the forward direction at call set-up. It contains address information and other information relating to the routing and handling of the call. initial address message with additional information (IAI) F: message initial d'adresse avec informations supplementaires (IAI) S: mensaje inicial de direccion con informacion adicional (MII) A type of message sent first in the forward direction at call set-up. It contains address, routing and handling information, such as charging and supplementary services information to be used in the call set-up procedures. 2081 subsequent address message (SAM) F: message subsequent d'adresse (MSA) S: mensaje subsiguiente de direccion (MSD) A type of message sent in the forward direction subsequent to the initial address message and containing further address informa- tion. 2082 subsequent address message with one signal F: message subsequent d'adresse a un seul signal S: mensaje subsiguiente de direccion con una se~al A type of message sent in the forward direction subsequent to the initial address message or to the subsequent address message and containing only one address signal. 2083 NSAP address (OSI-) F: adresse NSAP (OSI) S: direccion PASR (de la ISA) A global address as defined for OSI which is understandable over any network and can be used to address between networks. 2084 address complete (network) F: adresse complete (reseau) S: direccion completa (red) A message sent in the backward direction indicating that all the address (number) signals required by the network for routing the call to the called party have been received. 2085 address complete (alerting) F: adresse complete (alerte) S: direccion completa (aviso) A message sent in the backward direction indicating that all the address signals required for routing the call to the called party have been received and that the called party is being alerted. 2086 connect message F: message de connexion S: mensaje de conexion A message sent in the backward direction indicating that all the address signals required for routing the call to the called party have been received, and that the called party has answered. 2087 continuity check message F: message de contr | le de continuite S: mensaje de prueba de continuidad A type of message containing a continuity signal or a continuity-failure signal. 2088 end-of-selection signal F: signal de fin de selection S: se~al de fin de seleccion A signal sent in the backward direction indicating the suc- cessful completion or unsuccessful termination of the call set-up process, and which may contain information or the called party's line condition. Note - The functions of this signal in Signalling System No. 7 are provided by the Address Complete message, and the Unsuccess- ful Call Set-up message. 2089 delayed release message (DRS) F: message de liberation retardee (MLR) S: mensaje de liberacion diferida (LID) A message sent in either direction, generated by the network, in response to a request to release a call, if the network is applying a hold condition to the connection. 2090 message sequencing F: mise en sequence des messages S: secuenciacion de mensajes The procedures for ensuring that received messages are pro- cessed in the correct order. 2091 unreasonable message F: message inattendu S: mensaje irrazonable (o irracional) A message with an inappropriate signal content, an incorrect signal direction, or an inappropriate place in the message sequence. 2092 reasonableness check F: contr | le de vraisemblance S: prueba de racionabilidad (o de racionalidad) A procedure for verfifying whether the signalling information of a received signal message is reasonable in relation to the sequence of previously received signal messages for that circuit. 2093 call spill-over F: empietement de communications S: rebasamiento de llamada Receipt of an abnormally delayed signalling message from a previous call at a switching centre whilst a new call is being set up on that circuit. 2094 transaction (in signalling applications) F: transaction | (dans les applications de signalisation) S: transaccion | (en aplicaciones de se~alizacion) An interchange of enquiry and response messages between sig- nalling points that transfers information. 2095 enquiry (in a transaction) F: demande | (dans une transaction) S: averiguacion; indagacion | (en una transaccion) A signal or signals (possibly sent as a sequence of messages) requesting specific information. 2096 response (in a transaction) F: reponse | (dans une transaction) S: respuesta | (en una transaccion) A signal or signals (possibly sent as a sequence of messages) containing information requested by an enquiry. 2.1 Structure and generic applications 2101 message transfer part F: sous-systeme Transport de Messages S: parte (de) transferencia de mensajes The functional part of a common channel signalling system which transfers signal messages as required by all the users, and which performs the necessary subsidiary functions, for example error control and signalling security. 2102 user part F: sous-systeme Utilisateur S: parte (de) usuario A functional part of the common channel signalling system which transfers signalling messages via the message transfer part. Different types of user parts exist (e.g. for telephone and data services), each of which is specific to a particular use of the signalling system. 2103 signalling network F: reseau de signalisation S: red de se~alizacion A network used for signalling and consisting of signalling points and connecting signalling links. 2104 signalling network F: reseau semaphore S: red de se~alizacion A network used for transfer of signalling messages and con- sisting of signalling points and connecting common channel signal- ling links. 2106 signalling point F: point semaphore S: punto de se~alizacion A node in a signalling network which either originates and receives signal messages, or transfers signal messages from one signalling link to another, or both. Note - Signalling point may be qualified by a prefix, such as International, to denote a specific application. 2107 (signalling) originating point F: point semaphore d'origine S: punto de origen (de la se~alizacion) A signalling point in which a message is generated. 2109 (signalling) destination point F: point semaphore de destination S: punto de destino (de la se~alizacion) A signalling point to which a message is destined. 2110 adjacent signalling points F: points semaphores adjacents S: puntos de se~alizacion adyacentes Two signalling points that are directly interconnected by one or more signalling links. 2111 connection end-point F: point terminal de connexion S: punto extremo de conexion A signalling point which may be either originating or destina- tion. 2112 signalling point numbering plan F: plan de numerotage des points semaphores S: plan de numeracion de puntos de se~alizacion A formal description of the method of translating end-user provided address information into an address understandable by the signalling network. 2113 signalling point restart F: redemarrage d'un point semaphore S: rearranque de punto de se~alizacion A procedure that allows a graceful increase of traffic to a restarting node. 2114 signalling point code F: code d'un point semaphore S: codigo de punto de se~alizacion A binary code uniquely identifying a signalling point in a signalling network. This code is used, according to its position in the label, either as destination point code or as originating point code. 2116 signalling link F: canal semaphore (liaison de signalisation) S: enlace de se~alizacion A transmission means which consists of a signalling data link and its transfer control functions, used for reliable transfer of signalling messages. 2117 unavailable signalling link F: canal semaphore indisponible S: enlace de se~alizacion indisponible A signalling link which has been deactivated and cannot there- fore carry signalling traffic. 2118 data channel F: voie de donnees S: canal de datos A unidirectional transmission path for data, with transmission terminal equipment at both ends. 2119 signalling link group F: faisceau de canaux semaphores (faisceau de liaisons de signalisation) S: haz de enlaces de se~alizacion A set of signalling link(s) directly connecting two signalling points, and having the same physical characteristics (e.g., bit rate, propagation delay, etc.). 2120 regular signalling link F: canal semaphore normal (liaison de signalisation reguliere) S: enlace de se~alizacion regular The signalling link which normally carries some particular parcel of signalling traffic. 2121 reserve signalling link F: canal semaphore de secours (liaison de signalisation de reserve) S: enlace de se~alizacion de reserva The signalling link which can be used to carry all, or part of, the signalling traffic of a regular signalling link when the latter has failed or has been withdrawn from service. 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