ATIS 1000604-2014 Integrated Services Digital Network (ISDN) C Minimal Set of Bearer Services for the Basic Rate Interface.pdf

1、 ATIS-1000604.2014 Integrated Services Digital Network (ISDN) Minimal Set of Bearer Services for the Basic Rate Interface AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the

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11、tice of Disclaimer for example, a voice-only terminal equipment (TE) could implement only the procedures for circuit-mode speech (bearer capability information element, and the like) and not implement those for circuit-mode digital. (4) Devices that support the bearer services defined in this standa

12、rd by implementing associated procedures described in other American National Standards and using the default parameters and other specified mandatory parameters are expected to inter- operate successfully. (“Successfully“ means that they work together to obtain/provide the appropriate bearer servic

13、e.) 1.2 Relationship to Capabilities beyond the Mini- mal Set of Bearer Services. It is likely that ISDN implementations will provide capabilities beyond those defined in this standard. Some of these capabilities will eventually be standardized, while others will be specific to an implementation. Th

14、e following guidelines define the relationship of these additional capabilities to this standard. (I) The network, when viewed from the user-network interface, may also provide other additional services, capabilities, protocols, functions, and procedures not described in this standard or any America

15、n National Standard. These may or may not be invoked by a particular user at a particular user-public-network interface. (2) Customers premises equipment may implement additional services, capabilities, protocols, functions, and procedures not described in this standard or the American National Stan

16、dards on signaling (ATIS-1000607 and ATIS-1000608). These may or may not be supported by a particular network at a particular user-network interface. (3) The implementation of the additional aspects mentioned in the previous two points does not, therefore, make the user or network noncompliant with

17、this standard or with ATIS-0600601, ATIS-1000602, ATIS-0600605, ATIS-1000607, and ATIS-1000608 include. (4) Some or all of the additional aspects mentioned in 1.2(1) and 1.2(2) may be described in other standards; e.g., standard signaling for a standard supplementary service. 2 Referenced and Relate

18、d Standards 2.1 Referenced American National Standards. The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agree

19、ments based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. ATIS-1000604.2014 ATIS-0600601.1999(R2014), Telecommunications- Integrated Services Digital Network (ISDN)- Basic Access Interface for Use on Metallic Loo

20、ps for Application on the Network Side of the NT (Layer I Specification)2ATIS-1000602.1996(R2014), Telecommunications- Integrated Services Digital Network (ISDN) -Data-Link Layer Signalling Specification for Application at the User-Network Interface3ATIS-0600605.1991(R2014), Telecommunications- Inte

21、grated Services Digital Network (ISDN) -Basic Access Interface for S and T Reference Points (Layer 1 Specification)4ATIS-1000607.2000(R2009), Telecommunications Integrated Services Digital Network- Layer-3 Signaling Specification for Circuit-Switched Bearer Service for Digital Subscriber Signaling S

22、ystem Number 1 (DSSS1)5ATIS-1000608.1991(R2012), Telecommunications- Integrated Services Digital Network- Layer-3 Signaling Specification for X.25 Packet-Switched Bearer Service for Digital Subscriber Signaling System Number 1 (DSSS1)62.2 Other Referenced Standards. This standard is also intended to

23、 be used in conjunction with the following standards: ITU-T Recommendation G.711, Pulse Code Modulation (PCM) of Voice Frequencies7ITU-T Recommendation I.211, Bearer Services Supported by an ISDN8ITU-T Recommendation I.320, ISDN Protocol Reference Model8ITU-T Recommendation I.460, Multiplexing, Rate

24、 Adaption, and Support of Existing Interfaces8ITU-T Recommendation X-25, Interface between Data Terminal Equipment (DTE) and Data Circuit- Terminating Equipment (DCE) for Terminals Operating in the Packet Mode and Connected to Public Data Networks by Dedicated Circuit8ITU-T Recommendation X.200, Ref

25、erence Model of Open Systems Interconnection for ITU-T Applica- tions8ITU-T Recommendation X.210, Open Systems Interconnection (OSI) Layer Services Definition Conventions82.3 Related Standards. The standards listed here are for information only and are not essential for completion of this standard:

26、2This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005 3This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005 4Thi

27、s document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005 5This document is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005 6This do

28、cument is available from the Alliance for Telecommunications Industry Solutions (ATIS), 1200 G Street N.W., Suite 500, Washington, DC 20005 7This document is available from the International Telecommunications Union. ATIS-1000604.2014 ITU-T Recommendation X.2, International Data Transmission Service

29、s Optional Facilities in Public Data Networks8ITU-T Recommendation X.21, Interface between Data Terminal Equipment (DTE) and Data Circuit- Terminating Equipment (DCE) for Synchronous Operation on Poblic Data Networks83 Definitions 3.1 International Telegraph and Telephone Consultative Committee (ITU

30、-T). International Tele- graph and Telephone Consultative Committee (ITU-T) is one of the seven organizations of the International Telecommunication Union (ITU), a specialized agency of the United Nations since 1948 and an international treaty organization. The ITU traces its formal beginnings to 18

31、65. ITU-T has responsibility for the development of telecommunications standards in the ITU and consisted of fifteen study groups in the 1981-1984 study period. The general purpose of the ITU-T is to promote and ensure the operations of international telecommunications systems. 3.2 Integrated Servic

32、es Digital Network (ISDN). A network, in general evolving from an existing telephony network, that provides end-to-end digital connectivity to support a wide range of both voice and nonvoice services. User access to an ISDN is via a limited set of standard multipurpose interfaces. 3.3 D Channel. A 1

33、6-kbit/s channel carrying control or signaling information and, optionally, packet- ized information and telemetry on the remaining capacity. 3.4 B Channel. A 64-kbit/s channel that carries user information such as voice calls, circuit-switched data, or packet-switched data. To support the packet be

34、arer service defined in this standard, a B channel shall carry protocols at Layer 2 and 3 in accordance with ITU-T Recommendation X.25. 3.5 Layered Protocol. The protocol reference model is defined by layered structures based on and using the terminology of ITU-T Recommendations X.200 and X.210. The

35、 protocols referred to in this American National Standard conform to the reference model for ISDN specified in ITU-T Recommendation !.320. The ISDN reference model divides a protocol into seven layers; however, for the support of the minimal set of bearer services, only the first three layers are re

36、quired. Layers 1 through 3 provide the following functions: (1) Layer I (The Physical Layer). Layer 1 provides the mechanical, electrical, functional, and procedural characteristics to activate, maintain, and deactivate a physical circuit. Layer 1 allows for the transparent transmission of bits to t

37、he connecting medium. (2) Layer 2 (The Data Link Layer). Layer 2 provides relatively error-free transmission of data between the ends of a physical link. Layer 2 defines the procedures required to establish, maintain, and dis- connect the data link. (3) Layer 3 (The Network Layer). Layer 3 provides

38、the means to establish, maintain, and release network connections between application entities. Layer 3 provides the procedures for the exchange of messages between the user and its serving network equipment over the D channel. 3.6 Throughput. The throughput for any virtual connection is the number

39、of user data bits success- fully transferred in one direction across that connection per unit time. Successful transfer means that no user data bits are lost, added, or inverted in transfer. 3.7 Information Transfer Mode. This attribute de- scribes the operational mode for transferring (transportati

40、on and switching) user information through the ISDN. It can be used to characterize a telecommunication service or a connection in the network. Values associated with this attribute are circuit mode and packet mode. 3.8 Information Transfer Rate. This attribute de- scribes either the bit rate (circu

41、it mode) or the throughput (packet mode). It refers to the transfer of digital information between two access points or reference points. Values associated with this attribute are appropriate bit rate and throughput rate. ATIS-1000604.2014 3.9 Information Transfer Capability. This attribute describe

42、s the capability associated with the transfer of different types of information through the ISDN. It can be used to characterize a telecommunication service or connection. Values associated with this attribute are unrestricted digital, speech, 3.1-kHz audio, 7-kHz audio, 15-kHz audio, and video. 3.1

43、0 Communication Configuration. This attribute describe-s the special arrangement for transferring information between two or more access points. It completes the structure associated with a telecommunication service as it associates the relationship between the access points involved and the flow of

44、 information between these access points. Values associated with this attribute are point-to- point, multipoint, and broadcast. 3.11 Structure. This attribute refers to the capability of the ISDN to deliver the information to the destination access point or reference point in a structure (e.g., time

45、 interval for circuit-mode, service data unit for packet-mode) that was presented in a corresponding signal structured at the origin (access point or reference point). Values associated with this attribute are 8-kHz integrity, service data unit integrity, and unstructured. 3.12 Establishment of Comm

46、unication. This at- tribute, associated with a telecommunication service, describes the mode of establishment used to establish and release a given communication. Values associated with this attribute are demand, reserved, and permanent. 3.13 Symmetry. This attribute describes the relationship of in

47、formation flow between two (or more) access points or reference points involved in a communication. It characterizes the structure associated with a telecommunication service or a connection. Values associated with this attribute are unidirectional, bidirectional symmetric, and bidirectional asymmet

48、ric. 3.14 Channel and Rate. This attribute describes the channels and their bit rate used to transfer the user information or the signaling information, or both, at a given access point or reference point. Values associated with this attribute are: name of the channel and the corresponding bit rate.

49、 4 Background ITU-T Recommendation I.211 defines bearer services in terms of three categories of attributes: information transfer attributes, access attributes, and general attributes. Each attribute has a defined set of possible attribute values. The information transfer attributes define the transmission characteristics of connections between ISDN users at S/T reference points or between an ISDN user at a S/T reference point and an interworking point to another network. The information transfer attributes and values related to the minimal set of bearer services in this document