1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-1000612.1992(R2013) Integrated Services Digital Network (ISDN) Terminal Adaption Using Statistical Multiplexing As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the ind
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5、on (CITEL). For more information, visit. AMERICAN NATIONAL STANDARD Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the judg
6、ment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a co
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8、es not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National Sta
9、ndard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedure
10、s of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on all standards by calling or writing the American National Standards Institute. Notice
11、of Disclaimer their existence does not in any respect preclude anyone, whether he has approvedthe standards or not, from manufacturing, marketing, purchasing, or usingproducts, processes, or procedures not conforming to the standards.The American National Standards Institute does not develop standar
12、ds andwill in no circumstances give an interpretation of any American NationalStandard. Moreover, no person shall have the right or authority to issue aninterpretation of an American National Standard in the name of the AmericanNational Standards Institute. Requests for interpretations should be ad-
13、dressed to the secretariat or sponsor whose name appears on the title pageof this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the American National StandardsInstitute require that action be taken periodically to reaffirm, revise,
14、 or withdraw this standard. Purchasers of American National Standards mayreceive current information on all standards by calling or writing the AmericanNational Standards Institute.Published byAmerican National Standards Institute11 West 42nd Street, New York, New York 10036Copyright 1993 by Exchang
15、e Carriers Standards AssociationAll rights reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwise,without prior written permission of the publisher.Printed in the United States of AmericaAPS3C593/42ContentsPageiForeword ii1 Scope12 Normative
16、 references.13 Application.24 Terminal Adaption Protocol 45 Data Link Control Protocol 106 Protocol Specifications for Operation overFrame Relay Bearer Service .117 Protocol Specifications for Operation overCircuit Mode Bearer Service .118 Application of Terminal Adaption Protocol to Terminal Adapto
17、r Functions 22Tables1 Coding of C1 and C2 bits 62 Coding of B and F bits 63 Reserved LLI values for circuit mode applications124 Coding of C/R bit125 SETUP message content156 CONNECT message content 157 RELEASE message content .168 RELEASE COMPLETE message contents 16Figures1 ISDN connection scenari
18、os.22 Protocol Layers used in this standard33 Relationship between layering and frame formats44 Header octet format .55 Control state information octet 76 Address field format for circuit mode applications 127 Cause information element .178 Low layer compatibility information element 179 Logical lin
19、k identifier information element2110 Called party subaddress information element 21AnnexesA TE1 Application25B Mapping of Interface at R Reference Point Circuit to Control State Information28C Clock synchronization. .30D Bibliography.32Foreword (This foreword is not part of American National Standar
20、d T1.612-1992.)The project to revise American National Standard T1.612 was initiated underthe auspices of the Accredited Standards Committee on Telecommunications,T1, as an effort in the Terminal Adaption Subworking Group of T1S1.2.This standard is intended to provide a terminal adaption protocol fo
21、r usebetween data terminal equipment over a public or private ISDN. This revisionto T1.612 extends the use of this protocol for Frame Relay connections aswell as Circuit Mode connections. It is desirable to provide a standardizedprotocol to allow widely implemented non-ISDN protocols to access publi
22、cand private ISDN services. Asynchronous, synchronous HDLC framed, andbit transparent synchronous protocols are all supported by this standard. Thestandard has been written to help define the interface between different cus-tomer terminal elements and assure the interworking of these elements.This s
23、tandard contains four informative annexes. These annexes are forinformation only and are not considered to be part of the standard.Suggestions for the improvement of this standard are welcome. Theyshould be sent to the Exchange Carriers Standards Association, 1200 GStreet NW, Suite 500, Washington,
24、DC, 20005.This standard was processed and approved for submittal to ANSI byAccredited Standards Committee on Telecommunications, T1. Committeeapproval of the standard does not necessarily imply that all committeemembers voted for its approval. At the time it approved this standard,Accredited Standar
25、ds Committee T1 had the following members:Ivor N. Knight, ChairmanArthur K. Reilly, Vice-ChairmanAlvin Lai, Secretary E.R. Hapeman, Senior EditorRandy Ottman, Technical EditorOrganization Represented Name of RepresentativeEXCHANGE CARRIERSAmeritech Services, Inc. . Laurence A. YoungRobert Koren (Alt
26、.)Bell Atlantic.John W. SeazholtzRoger Nucho (Alt.)Bellcore.G. Gary SchlangerRalph E. Jensen (Alt.)Bellsouth Services.Leonard Strickland, Jr.William J. McNamara, III (Alt.)Centel Corporation Bruce BeckerCincinnati Bell Telephone William P. KeidelT. C. Grimes (Alt.)Contel Corporation Steve LinskeySte
27、phen P. Welsh (Alt.)Exchange Carriers Standards AssociationJoseph MendozaGregory L. Theus (Alt.)GTE Telephone Operations .Gregory L. TheusRichard L. Cochran (Alt.)National Telephone Cooperative Association .Joseph M. FlaniganNYNEX .James F. BaskinLeo Katz (Alt.)Pacific Bell Fred DoellStanley Chum (A
28、lt.)Puerto Rico Telephone Company.Segundo RuizSouthwestern Bell Corporation C. C. BaileyJoseph Mendoza (Alt.)iiiiiUnited Telecommunications, Inc. .Robert P. McCabeHarold L. Fuller (Alt.)US Telephone Association (USTA) Paul K. HartThomas Gajeski (Alt.)U S West.James L. EitelJames Dahl (Alt.)INTEREXCH
29、ANGE CARRIERSAmerican Mobile Satellite Corporation .Michael K. WardWilliam Garner (Alt.)AT using either demand or semi-permanentestablishment of communications; and over any of the following types of accesschannel: B, H0, H10, H11or, additionally, forFrame Relay bearer connections, D. It mayalso be
30、used with the Multirate Circuit ModeBearer Service.This standard also describes how this protocolis related to synchronous and asynchronousinterface specifications using the interchangecircuits such as defined in RecommendationV.24, EIA/TIA 232-E or EIA/TIA 530-A. It isnot intended to be a functiona
31、l specificationfor an implementation of any system contain-ing a TE1 or TA functional group. Except asexplicitly noted, it is restricted to the definitionof the protocol at the user-network interface(reference points S, T or U) and the ISDN-sideinterface of an interworking function (IWF).The termina
32、l adaption protocol in this stan-dard may be used in support of three classesof non-ISDN-terminal protocols. These are:a) Asynchronous (Start/Stop) Protocols,supported using the Protocol SensitiveAsynchronous Mode;b) Synchronous Protocols using HDLCFrame Format, supported using the ProtocolSensitive
33、 Synchronous Mode;c) Synchronous Protocols, supported usingthe Bit Transparent mode.However, the Bit Transparent mode is not suit-able for use with Frame Relay connections.2 Normative referencesThe following American National Standardsand CCITT recommendations contain provi-sions which, through refe
34、rence in this text, con-stitiute provisions of this American NationalStandard. At the time of publication, the edi-tions indicated were valid. When later editionsof American National Standards are published,those later editions apply.ANSI T1.408-1990, Telecommunications Integrated Services Digital N
35、etwork (ISDN) Primary Rate Customer installation metallicinterfaces layer 1 specificationANSI T1.601-1988, Basic access inteface foruse on metallic loops for application on thenetwork side of the NT1 (layer 1 specification)ANSI T1.602-1989, Telecommunications Integrated Services Digital Network (ISD
36、N) Data-Link layer signalling specification forapplication at the usernetwork interface1American National Standardfor Telecommunications Integrated Services Digital Network (ISDN) Terminal Adaption Using Statistical MultiplexingAMERICAN NATIONAL STANDARD ANSI T1.612-19923 Application3.1 GeneralThe p
37、rotocols described in this standard maybe used by a TE1, TA or IWF, as illustrated infigure 1. The formats and procedures con-tained in this standard are defined in terms oftheir operation across interfaces at referencepoints S, T or U, or (in the case of an IWF)across interfaces that may be interna
38、l networkinterfaces. Where necessary to promote com-patibility, the relationship between theTerminal Adaption protocol and existing proto-cols at the interface at Reference Point R(where present) are also described. 3.2 ConnectivityTwo or more Terminal Adaption connectionsmay be multiplexed across a
39、 circuit switchedbearer connection or Frame Relay accessconnection. These connections are referred toin this Standard as “Logical Links”. LogicalLinks supporting different modes of theTerminal Adaption protocol may be multi-plexed across the same circuit switched bear-er connection or Frame Relay ac
40、cess connec-tion. Constraints on the number of LogicalLinks (up to the maximum number that can beANSI T1.607-1990, Telecommunications Integrated Services Digital Network (ISDN) Layer 3 signaling specification for circuit-switched bearer service for Digital SubscriberSignaling System Number 1 DSS1ANS
41、I T1.617-1991, Telecommunications Integrated Services Digital Network (ISDN) Signaling Specification for Frame RelayBearer Service for Digital SubscriberSignaling System number 1 (DSS1)ANSI T1.618-1991, Telecommunications Integrated Services Digital Network (ISDN) Core aspects of frame protocol for
42、use with framerelay bearer serviceCCITT Recommendation I.233.1 (1991), ISDNFrame Relaying Bearer Service 1), 2)CCITT Recommendation I.464 (1991),Multiplexing, Rate Adaption, and Support ofExisting Interfaces for Restricted 64 kbit/sTransfer Capability 1), 2)CCITT Recommendation Q.922 (1991), ISDNDat
43、a link layer specification for Frame ModeBearer Service 1), 2)CCITT Recommendation X.212 (1988), Datalink service definition for OSI interconnection 1), 3)ANSI T1.612-199221)Available from the American National Standards Institute, 11 West 42nd St., New York, NY 10036.2)Published in the 1991 CCITT B
44、lue Books.3)Published in the 1988 CCITT Blue Books.S, T, or UTE1TATE1TE2 TE2TAISDNIWFTO NATIONAL PSTNS, T, or U S, T, or US, T, or UR RTE1TE2TAIWFS, T, or UISDN data terminaldata terminal (DTE) with non-ISDN interfacesV.120 terminal adapterInterworking functionS, T, or U are architectural reference
45、points at which the physical interface of concern may be implemented.Figure 1 ISDN connection scenarioscoded in the Address field) and the combina-tions of Modes supported by a circuit switchedbearer connection or Frame Relay accessconnection are implementation dependent andnot subject to standardiz
46、ation.The Protocol Sensitive modes (a and b inclause 1) of this standard may be used to sup-port dissimilar rates (i.e., when used betweentwo TAs, the data rates at the interfaces atReference Point R may be different). The useof buffering, application of the flow control pro-tocol in this standard,
47、use of flow control pro-cedures at the R reference point, use of dis-carding and other strategies for support of dis-similar rates are implementation dependent. Parameter exchange procedures may bedefined to allow interworking between termi-nal adaptors (TAs) in an environment wheremultiple differen
48、t TA protocols are used with-out requiring interworking functions within thenetwork. Interworking between different typesof TAs can be accomplished with Multiproto-col Terminal Adaptors (MTAs) that are capa-ble of supporting more than one protocol.However, interworking functions may be usedwhen TAs
49、are not capable of supporting morethan one protocol.3.3 Protocol ArchitectureFigure 2 shows the protocol architecture ofthe User-Plane, defined for the purposes ofthis standard. The protocol defined in thisstandard may be viewed as having thePhysical layer and a Data Link Layer havingthree sublayers: the Core Sublayer, the DataLink Control Sublayer and the TerminalAdaption Sublayer. The Data Link CoreSublayer and the Data Link Control Sublayerare subdivisions of the Data Link Layer (seeRecommendation X.212). This layering is inalignment with CCITT RecommendationI
