5i' PART I I.100-Series Recommendations GENERAL STRUCTURE Blanc MONTAGE: PAGE 2 = PAGE BLANCHE SECTION 1 FRAME OF I-SERIES RECOMMENDATIONS TERMINOLOGY Recommendation I.110 PREAMBLE AND GENERAL STRUCTURE OF THE I-SERIES RECOMMENDATIONS FOR THE INTEGRATED SERVICES DIGITAL NETWORK (ISDN) (Malaga-Torremolinos, 1984; amended at Melbourne, 1988) 1 Preamble 1.1 Introduction An ISDN is a network, in general evolving from a telephony Integrated Digital Network (IDN), that provides end-to-end digital connectivity to support a wide range of services, including voice and non-voice services, to which users have access by a limited set of standard multi-purpose user-network interfaces. This concept requires a family of CCITT Recommendations. The I-Series Recommendations will provide principles and guidelines on the ISDN concept, as well as a detailed specification of the user-network and internetwork interfaces. They will further contain suitable references so that the detailed Recommendations on specific elements within the network can continue to be developed in the appropriate Recommendation series. Figure 1/I.110 produces a broad outline of the structure of the I-Series of Recommendations and their relationship to other Recommendations. As shown in the Figure, the current structure of the I-Series documentation is subdivided into seven major parts. Other I-Series documents may be added as the need arises. In addition, to support the implementation of the ISDN concepts, Recommendations have been produced and others will be produced in other Series by the appropriate specialist group (see Recommendation I.111). 1.2 Basis of the I-Series approach In order to standardize all necessary aspects of ISDN the CCITT has divided the subject matter into a number of distinct (but obviously related) areas (see Figure 2/I.110). Three of these areas are the following: 1) Services (I.200-Series of Recommendations); 2) Network aspects (I.300-Series of Recommenda- tions); 3) User-network access and interfaces (I.400-Series of Recommendations). Network aspects are further supported by other Recommendations both inside and outside the I-Series. The I-Series Recommendations are directed at the following principles: a) the standardization of services offered to sub- scribers, so as to enable services to be internationally compati- ble; b) the standardization of user-network interfaces, so as to enable terminal equipment to be portable [and to assist in a)]; c) the standardization of network capabilities to the degree necessary to allow user-to-network and network-to-network interworking, so as to achieve a) and b) above. Figure 1/I.110, p. The distinction that has been made in this approach between services and network capabilities is perhaps the most important. In the past, each service which was a candidate for standardization was treated in isolation and the necessary standards developed. For the ISDN, a wide range of services has to be considered in a coor- dinated manner. In addition, in the past there has not been a cons- cious decision to separate the definition of standards required for services from the definition of the standards for the network capa- bilities to support these services. The approach, in the development of the I-Series, has been, first, to establish the broad concepts of the two areas of stan- dards, secondly, to uniquely define these two concepts, and thirdly, to show the relationship between them. The fourth area shown in Figure 2/I.110, is user equipment. The I-Series includes reference configurations which identify key functional groupings and their physical relationship. The inter- faces with the network are explicitly defined; however, the I-Series does not provide a detailed description of any specific terminal element. Figure 3/I.110 illustrates the relationship between services and network capability areas from a first-order viewpoint; nevertheless the relationship can be seen to be recursive. The fig- ure shows that the driving forces are: a) what the user wants or is prepared to purchase; b) the availability of the necessary technology; c) the economics of developing and enhancing ser- vices and the network capabilities. Figure 2/I.110, p. Figure 3/I.110, p. 2 List of Recommendations Part I - General structure - I.100-Series SECTION 1 - Frame of I-Series Recommendations - Terminology I.110 Preamble and general structure of the I-Series Recommenda- tions I.111 Relationship with other Recommendations relevant to ISDNs I.112 Vocabulary of terms for ISDNs I.113 Vocabulary of terms for broadband aspects of ISDNs SECTION 2 - Description of ISDNs I.120 Integrated Service Digital Networks (ISDNs) I.121 Broadband aspects of ISDNs I.122 Framework for providing additional packet mode ser- vices SECTION 3 - General modelling methods I.130 The method for the characterization of telecommunica- tion services supported by an ISDN and network capabilities of an ISDN SECTION 4 - Telecommunication network and science attri- butes I.140 Attribute technique for the characterization of telecommunication services supported by an ISDN and network capa- bilities of an ISDN I.141 ISDN charging capability attributes Part II - Service capabilities - I.200-Series I.200 Guidance to the I.200-Series of Recommendations SECTION 1 - General aspects of services in ISDN I.210 Principles of telecommunication services supported by an ISDN and the means to describe them SECTION 2 - Common aspects of services in ISDN I.220 Common dynamic description of basic telecommunication services I.221 Common specific characteristics of services SECTION 3 - Bearer services supported by an ISDN I.230 Definition of bearer service categories I.231 Circuit mode bearer service categories I.232 Packet mode bearer service categories SECTION 4 - Teleservices supported by an ISDN I.240 Definition of teleservices I.241 Teleservices supported by an ISDN SECTION 5 - Supplementary services in ISDN I.250 Definition of supplementary services I.251 Number identification supplementary services I.252 Call offering supplementary services I.253 Call completion supplementary services I.254 Multiparty supplementary services I.255 "Community of interest" supplementary services I.256 Charging supplementary services I.257 Additional information transfer supplementary ser- vices Part III - Overall network aspects and functions - I.300-Series SECTION 1 - Network functional principles I.310 ISDN - Network functional principles SECTION 2 - Reference models I.320 ISDN Protocol reference model I.324 ISDN network architecture I.325 Reference configurations for ISDN connection types I.326 Reference configurations for relative network resource requirements I.32x ISDN hypothetical reference connections SECTION 3 - Numbering, addressing and routing I.330 ISDN numbering and addressing principles I.331 (E.164) Numbering plan for the ISDN era I.332 Numbering principles for interwork between ISDNs and dedicated networks with different numbering plans I.333 Terminal selection in ISDN I.334 Principles relating ISDN numbers/subaddress to the OSI reference model network layer addresses I.335 ISDN routing principles SECTION 4 - Connection types I.340 ISDN connection types SECTION 5 - Performance objectives I.350 General aspects of Quality of Service and network performance in digital networks, including ISDNs I.351 Recommendations in other Series including network performance objectives that apply at T-reference points of an ISDN I.352 Network performance objectives for call processing delays Part IV - ISDN user-network interfaces - I.400-Series SECTION 1 - ISDN user-network interfaces I.410 General aspects and principles relating to Recommen- dations on ISDN user-network interfaces I.411 ISDN user-network interfaces - Reference configura- tions I.412 ISDN user-network interfaces - Interface structures and access capabilities SECTION 2 - Application of I-Series Recommendations to ISDN user-network interfaces I.420 Basic user-network interface I.421 Primary rate user-network interface SECTION 3 - ISDN user-network interfaces: Layer 1 Recommen- dations I.430 Basic user-network interface - Layer 1 specification I.431 Primary rate user-network interface - Layer 1 specif- ication I.43x Higher rate user-network interfaces SECTION 4 - ISDN user-network interfaces: Layer 2 Recommen- dations I.440 (Q.920) ISDN user-network interface data link layer - general aspects I.441 (Q.921) ISDN user-network interface data link layer specification SECTION 5 - ISDN user-network interfaces: Layer 3 Recommen- dations I.450 (Q.930) ISDN user-network interface layer 3 - general aspects I.451 (Q.931) ISDN user-network interface layer 3 specifi- cation for basic call control I.452 (Q.932) ISDN user-network interface layer 3 specifi- cation - generic procedures for the control of ISDN supplementary services SECTION 6 - Multiplexing, rate adaptation and support of existing interfaces I.460 Multiplexing, rate adaptation and support of existing interfaces I.461 (X.30) Support of X.21 and X.21 | fIbis and X.20 | fIbis based Data Terminal Equipments (DTEs) by an ISDN I.462 (X.31) Support of packet mode terminal equipment by an ISDN I.463 (V.110) Support of Data Terminal Equipments (DTEs) with V-series type interfaces by an ISDN I.464 Multiplexing, rate adaptation and support of existing interfaces for restricted 64 kbit/s transfer capability I.465 Support by an ISDN of data terminal equipment with V-Series type interfaces with provision for statistical multiplex- ing SECTION 7 - Aspects of ISDN affecting terminal requirements I.470 Relationship of terminal functions to ISDN Part V - Internetwork interfaces - I.500-Series I.500 General structure of ISDN interworking Recommenda- tions I.510 Definitions and general principles for ISDN inter- working I.511 ISDN-to-ISDN Layer 1 internetwork interface I.515 Parameter exchange for ISDN interworking I.520 General arrangements for network interworking between ISDNs I.530 Network interworking between an ISDN and a public switched telephone network (PSTN) I.540 (X.321) General arrangements for interworking between Circuit-Switched Public Data Networks (CSPDNS) and Integrated Services Digital Networks (ISDNs) for the provision of data transmission services I.550 (X.325) General arrangements for interworking between Packet Switched Public Data Networks (PSPDNs) and Integrated Services Digital Networks (ISDNs) for the provision of data services I.560 (V.202) Requirements to be met in providing the telex service within the ISDN Part VI - Maintenance principles - I.600-Series I.601 General maintenance principles of ISDN subscriber access and subscriber installation I.602 Application of maintenance principles to ISDN sub- scriber installation I.603 Application of maintenance principles to ISDN basic accesses I.604 Application of maintenance principles to ISDN primary rate accesses I.605 Application of maintenance principles to static mul- tiplexed ISDN basic accesses Recommendation I.111 RELATIONSHIP WITH OTHER RECOMMENDATIONS RELEVANT TO ISDNs (Malaga-Torremolinos, 1984; amended at Melbourne, 1988) The I-Series of Recommendations applies to the general concept and to the network capabilities of an ISDN mainly insofar as they appear at user-network interfaces and internetwork interfaces. Moreover, the detailed specifications of ISDN interfaces are con- tained in the I-Series of Recommendations. The specific aspects within the network, and ancillary features that are necessary to support the above, will continue to be covered wholly or in part, by the appropriate Series of Recom- mendations. Such aspects may include: - technical characteristics of component parts and their performance objectives (e.g. transmission systems, switching systems, interexchange signalling systems); - network synchronization; - maintenance and operation; - services; - tariffs and charging. Some of the existing Recommendations for telephony and other dedicated service networks are directly applicable also to ISDNs. However, other Recommendations in those Series may need to be developed in order to cover applications in an ISDN. References to other Recommendations relevant to ISDNs and/or used in developing I-Series Recommendations are listed in Table 1/I.111. Blanc H.T. [T1.111] TABLE 1/I.111 References to other Recommendations relevant to ISDNs _____________________________________________________________________________ vide vide { Access, user-network (I.400-Series) - Q.920, Q.930 Adaptation, terminal (I.460-Series) - X.30, X.31 - V.110, V.120 Bearer services - X.25, X.31, X.300 - G.711 Charging (I.141, I.326) - D.93, D.200-Series Digital switching - Q.500-Series Digital transmission - G.700-Series, G.800-Series, G.900-Series Exchange, digital local - Q.511 to Q.517 Interworking: digital hierarchies - G.802 Interworking, ISDN and other networks (I.500-Series) - X.1, X.2, X.10, X.15, X.25, X.30, X.31, X.71, X.75, X.81 - X.180, X.181, X.300-Series - V.110, V.120 - U.12, U.202 - Q.921, Q.931 Interworking, signalling systems - Q.120 to Q.180, Q.251 to Q.300, Q.310 to Q.490 - Q.600-Series, Q.700-Series - X.75 Management and maintenance (I.600-Series) - M.20, M.21, M.22, M.24, M.30, M.36, M.40 - M.122, M.125 - M.250, M.251, M.550, M.555, M.557 - M.770, M.782 - G.601, G.700-Series, G.821, G.900-Series - Q.512, Q.542, Q.940 Modelling (I.130-Series, I.140-Series, I.300-Series) - Q.65, Q.71, Q.80, Q.500-Series, Q.700-Series - X.200, X.300 - Z.100-Series Numbering (I.330-Series) - E.163, E.164, E.165, E.166, E.167 - F.69 - X.121, X.122, X.200 - Q.921, Q.931, Q.932 - T.90 Parameter exchange (I.515) - V.32, V.100, V.110, V.120 - G.725 - X.21, X.21 | fIbis , X.25, X.30, X.31 - Q.931, Q.932, Q.764 } { Performance (I.350-Series) - G.100-Series - G.821, G.822, G.823 and G.824 - P.56, P.66 and P.84 Protection - K.20 - K.22 - K.23 Routing (I.335) - E.164, E.170 to E.172, E.502 - G.801 - X.110 - Q.600-Series, Q.700-Series, Q.930, Q.931 Signalling, user-network (I.440-Series, I.450-Series) - Q.920 to Q.940 Signalling, inter-exchange (SS No. 7) - Q.701 to Q.714, Q.761 to Q.766, Q.771 to Q.774 Speech encoding - G.711, G.721, G.722, G.723, G.725 Supplementary services (I.250-Series) - Q.932 - Q.71 to Q.99 - X.2 Switching - Q.500-Series Telephony, transmission quality - G.100-Series Teleservices (I.240-Series) - E-Series - F-Series - X-Series - T-Series - U.201 - G.711, G.722 Terminals (I.470) - T.90 - E.330, E.331 - P.31 - V.110, V.120, V.230 Tones and announcements (I.530) - E.184 - V.25 Transmission - G.700-Series, G.800-Series, G.900-Series Vocabulary (I.112, I.113) - G.701 } _____________________________________________________________________________ | | | Tableau 1/I.111 [T1.111], p. 4 Recommendation I.112 VOCABULARY OF TERMS FOR ISDNs (Malaga-Torremolinos, 1984; amended at Melbourne, 1988) 1 Introduction This Recommendation consists primarily of those terms and definitions that are considered essential to the understanding and application of the principles of an Integrated Services Digital Network (ISDN). They are not exclusive to ISDNs and are also recom- mended for application, insofar as they are relevant, to other types of telecommunication networks. Included are some terms that are already defined in other Recommendations. However, the definitions given here embrace only the essential concepts and on that basis it is considered that they are not inconsistent with the more specialized definitions that appear in those other Recommendations. A small number of the terms and definitions in this Recommen- dation are duplicated in Recommendation G.701. References to these definitions are given in brackets, for example { 00 } as an aid to ensuring consistency between the two Recommendations in the event of future amendments. According to the conventions applied in this Recommendation, any term in common usage but whose use is deprecated in the sense defined, is shown as in the following example: "419 functional group [functional grouping]". Where a truncated term is widely used in an understood context the complete term is quoted following the colloquial form, for example, "111 circuit, telecommunication circuit". Annex A to this Recommendation contains an alphabetical list of all of the terms contained in this Recommendation. CONTENTS 2.1 General 2.2 Services 2.3 Networks 2.4 Access 2.5 Signalling Annex A - Alphabetical List 2 Vocabulary of terms 2.1 General 101 communication F: communication S: comunicacion The transfer of information according to agreed conventions. Note - In French and Spanish the corresponding terms "commun- ications" and "comunicacion" have additional specific meanings in telecommunication. 102 signal { 00 } F: signal S: se~al A physical phenomenon one or more of whose characteristics may vary to represent information. 103 analogue signal { 00 } F: signal analogique S: se~al analogica A signal one of whose characteristic quantities follows con- tinuously the variations of another physical quantity representing information. 104 discretely-timed signal { 00 } F: signal (temporel) discret S: se~al discretamente temporizada A signal composed of successive elements in time, each element having one or more characteristics which can convey information, for example, its duration, its waveform and its amplitude. 105 digital signal { 00 } F: signal numerique S: se~al digital A discretely-timed signal in which information is represented by a number of well-defined discrete values that one of its charac- teristic quantities may take in time. Note - The term may be qualified to indicate the digit rate, for example: "140 Mbit/s digital signal". 106 transmission { 00 } F: transmission S: transmision The action of conveying signals from one point to one or more other points. Note 1 - Transmission can be effected directly or indirectly, with or without intermediate storage. Note 2 - The use of the English word "transmission" in the sense of "emission" is deprecated. 107 digital transmission { 00 } F: transmission numerique S: transmision digital The transmission of digital signals by means of a channel or channels that may assume in time any one of a defined set of discrete states. 108 channel, transmission channel { 00 } F: voie, voie de transmission S: canal, canal de transmision A means of unidirectional transmission of signals between two points. Note 1 - Several channels may share a common path; for exam- ple each channel may be allocated a particular frequency band or a particular time slot. Note 2 - The term may be qualified by the nature of the transmitted signals, by the bandwidth, by the digit rate, or by an arbitrary designation. Note 3 - See also Term 414, access channel. 109 digital channel, digital transmission channel { 00 } F: voie numerique, voie de transmission numerique S: canal digital, canal de transmision digital The means of unidirectional digital transmission of digital signals between two points. 110 telecommunication { 00 } F: telecommunication S: telecomunicacion Any transmission and/or emission and reception of signals representing signs, writing, images and sounds or intelligence of any nature by wire, radio, optical or other electromagnetic sys- tems. 111 circuit, telecommunication circuit { 00 } F: circuit, circuit de telecommunications S: circuito, circuito de telecomunicacion A combination of two transmission channels permitting bi-directional transmission of signals between two points, to sup- port a single communication. Note 1 - If the telecommunication is by nature unidirectional (for example: long distance television transmission), the term "circuit" is sometimes used to designate the single channel provid- ing the facility. Note 2 - In a telecommunication network use of the term "cir- cuit" is generally limited to a telecommunication circuit directly connecting two switching devices or exchanges, together with asso- ciated terminating equipment. Note 3 - A telecommunication circuit may permit transmission in both directions simultaneously (duplex) or not simultaneously (simplex). Note 4 - A telecommunication circuit that is used for transmission in one direction only is sometimes referred to as a unidirectional telecommunication circuit. A telecommunication cir- cuit that is used for transmission in both directions (whether simultaneously or not) is sometimes referred to as a bidirectional telecommunication circuit. 112 digital circuit, digital telecommunication circuit { 00 } F: circuit numerique, circuit numerique de telecommunications S: circuito digital, circuito de telecomunicacion digital A combination of two digital transmission channels permitting bidirectional digital transmission between two points, to support a single communication. Note 1 - If the telecommunication is by nature unidirectional (for example: long distance television transmission), the term "digital circuit" is sometimes used to designate the single digital channel providing the facility. Note 2 - In a telecommunication network, use of the term "digital circuit" is generally limited to a digital telecommunica- tion circuit directly connecting two switching devices or exchanges, together with associated terminating equipment. Note 3 - A digital telecommunication circuit may permit transmission in both directions simultaneously (duplex), or not simultaneously (simplex). Note 4 - A digital telecommunication circuit that is used for transmission in one direction only is sometimes referred to as a unidirectional digital telecommunication circuit. A digital telecommunication circuit that is used for transmission in both directions (whether simultaneously or not) is sometimes referred to as a bidirectional digital telecommunication circuit. 113 switching F: commutation S: conmutacion The process of interconnecting functional units, transmission channels or telecommunication circuits for as long as is required to convey signals. 114 digital switching F: commutation numerique S: conmutacion digital Switching by means that may assume in time any one of a defined set of discrete signal states, in order to convey digital signals. 115 exchange F: commutateur [central] S: central An aggregate of traffic carrying devices, switching stages, controlling and signalling means, and other functional units at a network node that enables subscriber lines, telecommunication cir- cuits and/or other functional units to be interconnected as required by individual users. 116 digital exchange F: commutateur numerique S: central digital An exchange that switches digital signals by means of digital switching. 117 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 transmission path. 2.2 Services 201 service, telecommunication service F: service, service de telecommunications S: servicio, servicio de telecomunicacion That which is offered by an Administation or RPOA to its cus- tomers in order to satisfy a specific telecommunication require- ment. Note - Bearer service and teleservice are types of telecom- munication service. Other types of telecommunication service may be identified in the future. 202 bearer service F: service support S: servicio portador A type of telecommunication service that provides the capabil- ity for the transmission of signals between user-network inter- faces. Note - The ISDN connection type used to support a bearer ser- vice may be identical to that used to support other types of telecommunication service. 203 teleservice [telecommunication service] F: teleservice S: teleservicio, servicio final A type of telecommunication service that provides the complete capability, including terminal equipment functions, for communica- tion between users according to protocols established by agreement between Administrations and/or RPOAs. 204 teleaction service [telemetry service] F: service de teleaction [service de telemesure] S: servicio de teleaccion A type of telecommunication service that uses short messages, requiring a very low transmission rate, between the user and the network. Note - Examples of teleaction services are: telealarm, telecommand, telealerting. 205 demand service, demand telecommunication service F: service a la demande, service de telecommunications a la demande S: servicio por demanda, servicio de telecomunicacion por demanda A type of telecommunication service in which the communication path is established almost immediately, in response to a user request effected by means of user-network signalling. 206 reserved circuit service, reserved circuit telecommuni- cation service F: service de circuit reserve, service de circuit de telecommunications reserve S: servicio de circuito reservado, servicio de telecomunicacion de circuito reservado A type of telecommunication service in which the communication path is established at a time specified in advance by the user, in response to a user request effected by means of user-network sig- nalling. Note - The duration of the communication, or the time of release of the communication path, may also be specified in advance by the user. 207 permanent circuit service, permanent circuit telecom- munication service F: service de circuit permanent, service de circuit de telecommunications permanent S: servicio de circuito permanente, servicio de telecomunicacion de circuito permanente A type of telecommunication service in which the communication path is established in response to a customer request effected by means of an operational or administrative message. Note - Release of the communication path is effected in a similar way to its establishment. 208 service attribute, telecommunication service attribute F: attribut de service, attribut de service de telecommunications S: atributo de servicio, atributo de servicio de telecomunicacion A specified characteristic of a telecommunication service. Note - The value(s) assigned to one or more service attri- butes may be used to distinguish that telecommunication service from others. 2.3 Networks 301 link, transmission link F: liaison, liaison de transmission S: enlace, enlace de transmision A means of transmission with specified characteristics between two points. Note - The type of the transmission path or the capacity is normally indicated, e.g. radio link, coaxial link, or 2048 kbit/s link. 302 digital link, digital transmission link { 00 } F: liaison numerique, liaison de transmission numerique S: enlace digital, enlace de transmision digital The whole of the means of digital transmission of a digital signal of specified rate between two digital distribution frames (or equivalent). Note 1 - A digital link comprises one or more digital sec- tions and may include multiplexing and/or demultiplexing, but not switching. Note 2 - The term may be qualified to indicate the transmis- sion medium used, for example: "digital satellite link". Note 3 - The term always applies to the combination of "go" and "return" directions of transmission, unless stated otherwise. Note 4 - The term "digital path" is sometimes used to describe one or more digital links connected in tandem, especially between equipments at which the signals of the specified rate ori- ginate and terminate. 303 node, switching node F: noeud, noeud de commutation S: nodo, nodo de conmutacion A point at which switching occurs. Note - The term "node" is sometimes used to refer to a point at which circuits are interconnected by means other than switching. In such a case a suitable qualification should be used, for example: "synchronization node". 304 digital switching node F: noeud de commutation numerique S: nodo de conmutacion digital A node at which digital switching occurs. 305 network, telecommunication network F: reseau, reseau de telecommunications S: red, red de telecomunicacion A set of nodes and links that provides connections between two or more defined points to facilitate telecommunication between them. 306 digital network, integrated digital network F: reseau numerique, reseau numerique integre S: red digital, red digital integrada A set of digital nodes and digital links that uses integrated transmission and switching to provide digital connections between two or more defined points to facilitate telecommunication between them. 307 integrated services network F: reseau avec integration des services S: red de servicios integrados A network that provides or supports a range of different telecommunication services. 308 integrated services digital network (ISDN) F: reseau numerique avec integration des services (RNIS) S: red digital de servicios integrados (RDSI) An integrated services network that provides digital connec- tions between user-network interfaces. 309 connection F: connexion, cha | ne de connexion S: conexion A concatenation of transmission channels or telecommunication circuits, switching and other functional units set up to provide for the transfer of signals between two or more points in a telecommunication network, to support a single communication. 310 digital connection { 00 } F: connexion numerique S: conexion digital A concatenation of digital transmission channels or digital telecommunication circuits, switching and other functional units set up to provide for the transfer of digital signals between two or more points in a telecommunication network, to support a single communication. 311 switched connection F: connexion commutee S: conexion conmutada A connection that is established by means of switching. Note - A switched connection may be used to support both demand and reserved circuit services. 312 non-switched connection F: connexion non commutee S: conexion no conmutada A connection that is established without the use of switching, for example by means of hard-wired joints. 313 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 channels or cir- cuits. 314 ISDN connection F: connexion RNIS S: conexion de RDSI A connection that is established through an ISDN between specified ISDN interfaces. 315 connection attribute, ISDN connection attribute F: attribut de connexion, attribut de connexion RNIS S: atributo de conexion, atributo de conexion de RDSI A specified characteristic of an ISDN connection. Note - The value(s) assigned to one or more connection attri- butes may be used to distinguish that connection from others. 316 connection type, ISDN connection type F: type de connexion, type de connexion RNIS S: tipo de conexion, tipo de conexion de RDSI A description of a set of ISDN connections that consists of stated values of one or more ISDN connection attributes. 317 connection element, ISDN connection element F: element de connexion, element de connexion RNIS S: elemento de conexion, elemento de conexion de RDSI A part of an ISDN connection which has stated values of one or more ISDN connection attributes. 318 switched connection element, switched ISDN connection element F: element de connexion commutee, element de connexion RNIS commutee S: elemento de conexion conmutada, elemento de conexion conmutada de RDSI An ISDN connection element that is established by means of switching. 319 non-switched connection element, non-switched ISDN con- nection element F: element de connexion non commutee, element de connexion RNIS non commutee S: elemento de conexion no conmutada, elemento de conexion no conmutada de RDSI An ISDN connection element that is established without switch- ing. 320 point-to-point ISDN connection F: connexion RNIS point-a-point S: conexion de RDSI punto a punto An ISDN connection that is established between two specified ISDN interfaces. 321 point-to-multipoint ISDN connection F: connexion RNIS point-multipoints S: conexion de RDSI punto a multipunto An ISDN connection that is established between a single speci- fied ISDN interface, and more than one other specified ISDN inter- face. 2.4 Access 401 user, user of a telecommunication network F: usager, usager d'un reseau de telecommunications F: usuario, usuario de una red de telecomunicacion A person or machine delegated by a customer to use the ser- vices and/or facilities of a telecommunication network. 402 user access, user-network access F: acces d'usager, acces d'usager-reseau S: acceso de usuario, acceso usuario-red The means by which a user is connected to a telecommunication network in order to use the services and/or facilities of that net- work. 403 function F: fonction S: funcion A set of processes defined for the purpose of achieving a specified objective. Note - Functions may be ordered in a logical hierarchy. 404 layer [level] F: couche [niveau] S: capa [nivel] A conceptual region that embodies one or more functions between an upper and a lower logical boundary within a hierarchy of functions. Note - The Open Systems Interconnection (OSI) reference model has seven layers. 405 protocol F: protocole S: protocolo A formal statement of the procedures that are adopted to ensure communication between two or more functions within the same layer of a hierarchy of functions. 406 access protocol F: protocole d'acces S: protocolo de acceso A defined set of procedures that is adopted at an interface at a specified reference point between a user and a network to enable the user to employ the services and/or facilities of that network. 407 user-user protocol F: protocole d'usager a usager S: protocolo usuario-usuario A protocol that is adopted between two or more users in order to ensure communication between them. 408 interface { 00 } F: interface S: interfaz The common boundary between two associated systems. 409 user-network interface F: interface usager-reseau S: interfaz usuario-red The interface between the terminal equipment and a network termination at which interface the access protocols apply. 410 layer interface F: interface de couche S: interfaz de capa The interface between adjacent layers of hierarchy of layers. 411 physical interface F: interface physique S: interfaz fisico The interface between two equipments. 412 interface specification F: specification d'interface S: especificacion de interfaz A formal statement of the type, quantity, form and order of the interconnections and interactions between two associated sys- tems, at their interface. 413 physical interface specification [physical interface] F: specification d'interface physique [interface physique] S: especificacion de interfaz fisico [interfaz fisico] A formal statement of the mechanical, electrical, electromag- netic and optical characteristics of the interconnections and interactions between two associated equipments, at their interface. 414 access channel [channel] F: canal d'acces [canal] 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 unidirectional working only, and then is commonly abbrevi- ated to "channel". In the special case where the term "access chan- nel" is used to encompass bidirectional working through the user-network interface, it 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 abbreviate the term to "H-channel", to "B-channel" or to "D-channel". Note 3 - Unless otherwise qualified, the access channel characteristics at the user-network interface are assumed to be bidirectional symmetric. When such characteristics are unidirec- tional, the term "unidirectional access channel" should be used. 415 interface structure, ISDN user-network interface struc- ture F: structure d'interface, structure d'interface RNIS usager-reseau S: estructura de interfaz, estructura de interfaz usuario-red de la RDSI The number and type of the access channels that appear at an ISDN user-network interface. 416 access capability, ISDN access capability F: capacite d'acces, capacite d'acces au RNIS S: capacidad de acceso, capacidad de acceso de la RDSI The number and type of the access channels at an ISDN access interface that are actually available for telecommunication pur- poses. 417 terminal equipment F: equipement terminal (ET) S: equipo terminal Equipment that provides the functions necessary for the opera- tion of the access protocols by the user. 418 network termination F: terminaison de reseau S: terminacion de red Equipment that provides the functions necessary for the opera- tion of the access protocols by the network. Note - The network termination provides essential functions for transmission purposes. 419 functional group [functional grouping] F: groupe fonctionnel [groupement fonctionnel] S: grupo funcional [agrupacion funcional] A set of functions that may be performed by a single equip- ment. 420 reference point F: point de reference S: punto de referencia A conceptual point at the conjunction of two non-overlapping functional groups. 421 reference configuration F: configuration de reference S: configuracion de referencia A combination of functional groups and reference points that shows possible network arrangements. 422 multipoint access F: acces multipoint S: acceso multipunto User access in which more than one terminal equipment is sup- ported by a single network termination. 423 access contention F: conflit d'acces S: contienda de accesso A conflict between the demands made on a network termination in multipoint access. 424 access contention resolution F: resolution des conflits d'acces S: resolucion de contienda de acceso The arbitration of conflicting demands on a network termina- tion in multipoint access. 2.5 Signalling 501 signalling F: signalisation S: se~alizacion The exchange of information specifically concerned with the establishment and control of connections, and with management, in a telecommunication network. 502 channel-associated signalling F: signalisation voie par voie S: se~alizacion asociada al canal A method of signalling in which signalling information relat- ing to the traffic carried by a single channel is transmitted in the channel itself or in a signalling channel permanently associ- ated with it. 503 common channel signalling F: signalisation sur voie commune, signalisation par canal semaphore S: se~alizacion por canal comun A method of signalling in which signalling information relat- ing to a multiplicity of circuits or functions or for network management, is conveyed over a single channel by addressed mes- sages. 504 in-slot signalling F: signalisation dans le creneau temporel 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. 505 out-slot signalling F: signalisation hors creneau temporel S: se~alizacion fuera del intervalo Signalling associated with a channel and transmitted in one or more separate digit time-slots not within the channel time-slot. 506 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. ANNEX A (to Recommendation I.112) Alphabetical list of terms contained in this Recommendation 416 access capability 414 access channel 423 access contention 424 access contention resolution 406 access protocol 103 analogue signal 202 bearer service 108 channel 502 channel-associated signalling 111 circuit 503 common-channel signalling 101 communication 309 connection 315 connection attribute 317 connection element 316 connection type 205 demand service 205 demand telecommunication service 109 digital channel 112 digital circuit 310 digital connection 116 digital exchange _________________________ The number against a term indicates its location in the vocabulary. 302 digital link 306 digital network 105 digital signal 114 digital switching 304 digital switching node 112 digital telecommunication circuit 107 digital transmission 109 digital transmission channel 302 digital transmission link 104 discretely-timed signal 115 exchange 313 exchange connection 403 function 419 functional group 504 in-slot signalling 306 integrated digital network 117 integrated digital transmission and switching 308 integrated services digital network (ISDN) 307 integrated services network 408 interface 412 interface specification 415 interface structure 416 ISDN access capability 314 ISDN connection 315 ISDN connection attribute 317 ISDN connection element 316 ISDN connection type 415 ISDN user-network interface structure 404 layer 410 layer interface 301 link 422 multipoint access 305 network 418 network termination 303 node 312 non-switched connection 319 non-switched connection element 319 non-switched ISDN connection element 505 out-slot signalling 207 permanent circuit service 207 permanent circuit telecommunication service 411 physical interface 413 physical interface specification 321 point-to-multipoint ISDN connection 320 point-to-point ISDN connection 405 protocol 421 reference configuration 420 reference point 206 reserved circuit service 206 reserved circuit telecommunication service 201 service 208 service attribute 102 signal 501 signalling 506 speech digit signalling 311 switched connection 318 switched connection element 318 switched ISDN connection element 113 switching 303 switching node 204 teleaction service 110 telecommunication 111 telecommunication circuit 305 telecommunication network 201 telecommunication service 208 telecommunication service attribute 203 teleservice 417 terminal equipment 106 transmission 108 transmission channel 301 transmission link 401 user 402 user access 402 user-network access 409 user-network interface 407 user-user protocol 401 user of a telecommunication network Recommendation I.113 VOCABULARY OF TERMS FOR BROADBAND ASPECTS OF ISDN (Melbourne, 1988) 1 Introduction This Recommendation consists primarily of those terms and definitions that are considered essential to the understanding and application of the principles of Broadband Aspects of Integrated Services Digital Network (B-ISDN). They are not exclusive to broad- band aspects of ISDN and are recommended also for application, insofar as they are relevant, to other types of telecommunication networks. Included are terms that may already be defined in other CCITT/CCIR Recommendations. However, the definitions given here embrace only the essential concepts and on that basis it is con- sidered that they are not inconsistent with the more specialized definitions that appear in those Recommendations. According to the conventions applied in this Recommendation, any term in common usage, but whose use is deprecated, is shown in brackets as in the following example: "broadband [wideband]". Where a truncated term is widely used in an understood context the complete term is quoted following the colloquial form, for example, "contribution, contribution application". Some definitions include terms in bold face to indicate that these terms are defined elsewhere in this Recommendation. Annex A to this Recommendation contains an alphabetical list of all the terms contained in this Recommendation. 2 Vocabulary of terms (This section is divided into two sub-sections, 2.1 Services, and 2.2 Interfaces, channels and transfer modes. Within each sub-section the terms are listed and defined.) 2.1 Services 101 broadband [wideband] F: large bande S: banda ancha A service or system requiring transmission channels capable of supporting rates greater than the primary rate. 102 broadcast F: diffusion S: difusion A value of the service attribute "communication configura- tion", which denotes unidirectional distribution to all sub- scribers. Note - This term should not be confused with the term "broad- casting service" as defined in the ITU Radio Regulations. 103 connectionless service F: service sans connexion S: servicio sin conexion A service which allows the transfer of information among ser- vice subscribers without the need for end-to-end call establishment procedures. Note - Connectionless services may be used to support both interactive and distribution services. 104 contribution, contribution application F: contribution S: contribucion, aplicacion de contribucion Use of a broadband service or channel for transferring audio or video information to user for further post-production processing and subsequent distribution . 105 conversational service F: service conversationnel S: servicio conversacional An interactive service which provides for bidirectional com- munication by means of real-time (no store-and-forward) end-to-end information transfer from user to user or between user and host. 106 distribution, distribution aplication F: distribution S: disribucion, aplicacion de distribucion Use of a broadband service or channel for transferring audio or video information to a user or a number of users which will not apply post-production processing to the information. 107 distribution service F: service de distribution S: servicio de distribucion Service characterized by the unidirectional flow of informa- tion from a given point in the network to other (multiple) loca- tions. Distribution services are subdivided into two classes: dis- tribution services without user individual presentation control and distribution services with user individual presentation control . 108 distribution service with user individual presentation control F: service distribue avec contr | le de presentation par l'usager S: servicio de distribucion con control de la presentacion por el usuario A distribution service in which the information is provided as a sequence of information entities (e.g., frames) with cyclical repetition, so that the user has the ability to select individual information entities and can control the start and order of the information. 109 distribution service without user individual presenta- tion control F: service distribue sans contr | le de presentation par l'usager S: servicio de distribucion sin control de la presentacion por el usuario A distribution service which users can access without having any control over the start and order of the presentation of the distributed information. 110 enhanced-quality television F: television de qualite amelioree S: television de calidad mejorada Television of quality superior to existing-quality television , but less than the quality of high-definition television. 111 existing-quality television F: television de qualite conventionnelle S: television de calidad convencional Television as defined in conventional 625-line and 525-line television standards, such as NTSC, PAL and SECAM. 112 interactive service F: service interactif S: servicio interactivo A service which provides the means for bidirectional exchange of information between users or between users and hosts. Interac- tive services are subdivided into three classes of services: conversational services, messaging services and retrieval services . 113 messaging service F: service de messagerie S: servicio de mensajeria An interactive service which offers user-to-user communication between individual users via storage units with store-and-forward, mailbox and/or message handling (e.g. information editing, process- ing and conversion) functions. 114 mixed document F: document mixte S: documento mixto A document that may contain text, graphics, data, image, and moving picture information as well as voice annotation. 115 multipoint F: multipoint S: multipunto A value of the attribute "communication configuration" which denotes that the communication involves more than two network ter- minations. 116 post-production processing F: post-production (traitment apres production) S: tratamiento de posproduccion Further processing of contributed audio and video information, to change the form or presentation of the information prior to its final utilization. 117 retrieval service F: service de consultation S: servicio de consulta An interactive service which provides the capability of accessing information stored in database centres. This information will be sent to the user on demand only. The information can be retrieved on an individual basis, i.e., the time at which an infor- mation sequence is to start is under the control of the user. 118 sound retrieval service F: service de consultation de programmes sonores S: servicio de consulta de programas sonoros On-demand (user initiated) retrieval of music and other audio information. 119 videomessaging F: messagerie video S: videomensajeria A messaging service for the transfer for moving pictures. 2.2 Interfaces, channels and transfer modes 201 asynchronous time-division multiplexing F: multiplexage temporel asynchrone S: multiplexacion asincrona por division en el tiempo A multiplexing technique in which a transmission capability is organized in undedicated slots filled with cells with respect to each application's instantaneous real need. In this case, the ter- minal equipment - i.e. the customer application - defines the actual transmitted bit rate, whatever this rate is, possibly vari- able during the communication. This technique carries a labelled interface structure over a frame or a self-delineating labelled interface . 202 asynchronous transfer mode (ATM) F: mode de transfert asynchrone (MTA) S: modo de transferencia asincrono (MTA) A transfer mode in which the information is organized into cells ; it is asynchronous in the sense that the recurrence of cells depends on the required or instantaneous bit rate. Statisti- cal and deterministic values may also be used to qualify the transfer mode . 203 block F: bloc S: bloque A unit of information consisting of a header and an informa- tion field. 204 block payload F: charge utile de bloc S: carga neta del bloque The user information bits within a block . 205 broadband access F: acces a large bande S: acceso de banda ancha An ISDN access able to contain at least one channel capable of supporting a rate greater than the primary rate, or supporting an equivalent information transfer rate. 206 broadband communication channel F: voie de communication a large bande S: canal de comunicacion de banda ancha A standard portion of the information payload capacity , available to the user for ISDN services. A broadband communication channel exists only during a call, as set-up by a signalling or administrative procedure. The throughput supported by the broadband communication channel may be deterministic or statistical . 207 cell F: cellule S: celula A block of fixed length identified by a label at layer 1 of the OSI reference model. 208 circuit transfer mode F: mode de transfert par circuit S: modo de transferencia circuito, modo de transferencia por circuito A transfer mode in which transmission and switching functions are achieved by permanent allocation of channels/bandwidth between the connections. 209 deterministic, ATM deterministic transfer mode F: mode de transfert asynchrone deterministe S: deterministico, modo de transferencia deterministico MTA A specific transfer mode of the asynchronous transfer mode (ATM) in which the maximum information transfer capacity specified for a given service is provided to the user throughout a call. 210 frame F: trame S: trama A block of variable length identified by a label at layer 2 of the OSI reference model, e.g. an HDLC block. 211 framed interface F: interface tramee S: interfaz entramado An interface whose serial bit stream is segmented into periodic physical frames . Each frame is divided by a fixed parti- tion into an overhead and an information payload portion. 212 header, block header F: en-t | te de bloc S: encabezamiento, encabezamiento de bloque The bits within a block allocated for labelled multiplexing functions. 213 hybrid interface structure F: structure d'interface hybride S: estructure hibrida de interfaz An interface structure which has a mixture of labelled chan- nels and positioned channels . 214 information payload capacity F: capacite utile d'information S: capacidad de carga neta de informacion The interface rate minus the overhead. The bit rate of the interface payload . 215 interface overhead F: charge supplementaire d'interface S: tara del interfaz The remaining portion of the bit stream after deducting the information payload . The interface overhead may be essential (e.g. framing for an interface shared by users) or ancillary (e.g. performance monitoring). 216 interface payload F: charge utile d'interface S: carga neta del interfaz The portion of the bit stream of a framed interface which can be used for telecommunication services. Any signalling is included in the interface payload . 217 interface rate, interface bit rate F: debit (binaire) de l'interface S: velocidad del interfaz, velocidad binaria del interfaz The gross bit rate at the interface, e.g. the bit rate at the boundary between the physical layer and the physical medium. 218 labelled channel F: voie etiquetee S: canal etiquetado A temporally-ordered collection of all block payloads having a common label value. 219 labelled deterministic channel F: voie etiquetee deterministe S: canal etiquetado deterministico A labelled channel that, in each successive interval of speci- fied constant duration, contains on the average a constant number of blocks . 220 labelled interface structure F: structure d'interface etiquetee S: estructura de interfaz etiquetado An interface structure in which all services and signalling are provided by labelled channels . A labelled interface structure can be accommodated within a framed interface or a self-delineating labelled interface . 221 labelled multiplexing F: multiplexage par etiquetage S: multiplexacion por etiquetado The multiplexing of labelled channels by concatenating the blocks of the different channels. 222 labelled statistical channel F: voie etiquetee statistique S: canal etiquetado estadistico A labelled channel in which the payload of the successive blocks of the channel is random and/or the block durations are ran- dom. 223 logical signalling channel F: voie logique de signalisation S: canal logico de se~alizacion A logical channel for signalling information with a defined maximum capacity, which is contained within an information channel or a physical signalling channel . 224 network node interface (NNI) F: interface de noeud du reseau (INR) S: interfaz de nodo de red (INR) The interface between two network nodes (e.g. synchronous digital multiplex equipments, digital exchanges). 225 packet F: paquet S: paquete An information block identified by a label at layer 3 of the OSI reference model. 226 packet transfer mode F: mode de transfert par paquet S: modo de transferencia paquete, modo de transferencia por paquete A transfer mode in which the transmission and switching func- tions are achieved by packet oriented techniques, so as to dynami- cally share network transmission and switching resources between a multiplicity of connections. 227 payload module F: module de charge utile S: modulo de carga neta, modulo de carga util, modulo neto That portion of the information payload within which one or more channels entirely exist. 228 periodic frame F: trame periodique S: trama periodica A transmission segment which is repeated at intervals of equal duration (e.g. 125 usec), and may be delineated by incorporating fixed periodic patterns into the bit stream. 229 physical frame F: trame physique S: trama fisica A segment of a serial logical bit stream at an interface, partitioned into successive segments. 230 physical signalling channel F: voie physique de signalisation S: canal fisico de se~alizacion A dedicated physical channel (e.g. D-channel) used for signal- ling information. It may be used to carry other information. 231 positioned channel F: voie identifiee par sa position S: canal posicionado, canal localizado A channel that occupies bit positions which form a fixed periodic pattern (e.g. B, H and D-channels in ISDN user inter- faces). 232 positioned interface structure F: structure d'interface positionnee S: estructura de interfaz posicionado A structure in which all services and signalling are provided by positioned channels . Such a structure can exist only within a framed interface . 233 self-delineating block F: bloc a auto-cadrage S: bloque autodelimitado A block with the property that its endpoints can be identified by examining the block itself. A defined pattern or flag at the beginning of each block might serve to demarcate the block. 234 self-delineating labelled interface F: interface etiquetee a auto-cadrage S: interfaz etiquetado autodelimitado An interface whose entire serial bit stream consists of a self-delineating labelled multiplexing . 235 statistical, ATM statistical transfer mode F: statistique, mode de transfert asynchrone statis- tique S: estadistico, modo de transferencia estadistico MTA A specific transfer mode of the asynchronous transfer mode (ATM) in which the average information transfer capacity specified for a given service is provided to the user throughout a call. 236 synchronous time division multiplexing F: multiplexage temporel synchrone S: multiplexacion sincrona por division en el tiempo A multiplexing technique supporting the synchronous transfer mode (STM). 237 synchronous transfer mode (STM) F: mode de transfert (temporel) synchrone (MTS) S: modo de transferencia sincrono (MTS) A transfer mode which offers periodically to each connection a fixed-length word. 238 throughput F: capacite utile S: caudal de trafico, caudal The number of data bits contained in a block (e.g. between the address field and the CRC field of the LAPD-based frames) success- fully transferred in one direction across a section per unit time. 239 transfer mode F: mode de transfert S: modo de transferencia Aspects covering transmission, multiplexing and switching in a telecommunications network. 240 transit delay F: delai de transfert S: retardo de transito The time difference between the instant at which the first bit of the address field of a frame crosses one designated boundary, and the instant at which the last bit of the closing flag of the frame crosses a second designated boundary. 241 virtual circuit F: circuit virtuel S: circuito virtual A type of asynchronous transfer mode (ATM) connection involv- ing establishment and release procedures such that the label asso- ciated with each cell need not contain complete routing informa- tion. ANNEX A (to Recommendation I.113) Alphabetical list of terms contained in this Recommendation 201 asynchronous time-division multiplexing 202 asynchronous transfer mode 202 ATM 209 ATM deterministic transfer mode 235 ATM statistical transfer mode 203 block 212 block header 204 block payload _________________________ The number against a term indicates its location in the vocabulary. 101 broadband 205 broadband access 206 broadband communication channel 102 broadcast 207 cell 208 circuit transfer mode 103 connectionless service 104 contribution 104 contribution application 105 conversational service 209 deterministic 106 distribution 106 distribution application 107 distribution service 108 distribution service with user individual presentation control 109 distribution service without user individual presenta- tion control 110 enhanced-quality television 111 existing-quality television 210 frame 211 frame interface 212 header 213 hybrid interface structure 214 information payload capacity 112 interactive service 217 interface bit rate 215 interface overhead 216 interface payload 217 interface rate 218 labelled channel 219 labelled deterministic channel 220 labelled interface structure 221 labelled multiplexing 222 labelled statistical channel 223 logical signalling channel 113 messaging service 114 mixed document 115 multipoint 224 network node interface 224 NNI 225 packet 226 packet transfer mode 227 payload module 228 periodic frame 229 physical frame 230 physical signalling channel 231 positioned channel 232 positioned interface structure 116 post-production processing 117 retrieval service 233 self-delineating block 234 self-delineating labelled interface 118 sound retrieval service 235 statistical 237 STM 236 synchronous time division multiplexing 237 synchronous transfer mode 238 throughput 239 transfer mode 240 transit delay 119 videomessaging 241 virtual circuit 101 wideband (deprecated) Blanc