1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-1000634.1993(R2011) Frame Relaying Service Specific Convergence Sublayer (FR-SSCS) ATIS is the leading technical planning and standards development organization committed to the rapid development of global, market-driven standards for the infor
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15、 of an invention covered by patent rights will be required, and if any such use is required no position is taken regarding the validity of this claim or any patent rights in connection therewith. ATIS-1000634.1993(R2011), Frame Relaying Service Specific Convergence Sublayer (FR-SSCS) Is an American
16、National Standard developed by the ATIS Packet Technologies and Systems Committee (PTSC). Published by Alliance for Telecommunications Industry Solutions 1200 G Street, NW, Suite 500 Washington, DC 20005 Copyright 2011 by Alliance for Telecommunications Industry Solutions All rights reserved. No par
17、t of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. For information contact ATIS at 202.628.6380. ATIS is online at . Printed in the United States of America. American National StandardANSI T1.634
18、-1993for telecommunications frame relaying service specificconvergence sublayer (FR-SSCS)Approved November 18, 1993 Secretariat: Alliance for Telecommunications Industry SolutionsAn American National Standard implies a consensus of those substantially concerned with its scope and provisions. An Amer
19、icanNational Standard is intended as a guide to aid the manufacturer, the consumer, and the general public. The existence of anAmerican National Standard does not in any respect preclude anyone, whether he has approved the standard or not, from manufac-turing, marketing, purchasing, or using product
20、s, processes, or procedures not conforming to the standard. American NationalStandards are subject to periodic review and users are cautioned to obtain the latest editions.The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of anyA
21、merican National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American NationalStandard in the name of the American National Standards Institute.CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedures
22、 of the AmericanNational Standards Institute require that action be taken to reaffirm, revise, or withdraw this standard no later than five years from thedate of approval. Purchasers of American National Standards may receive current information on all standards by calling or writingthe American Nat
23、ional Standards Institute.Copyright 1993 by Alliance for Telecommunications Industry Solutions, 1200 G Street, NW, Suite 500, Washington, DC, 20005 ANSI2.5C1293/121 Scope, purpose, and field of appli-cationThis standard is identical to ITU-T Recom-mendation I.365.1, Frame relaying service spe-cific
24、convergence sublayer (FR-SSCS), from theInternational Telecommunication Union.This standard specifies the Frame RelayingService Specific Convergence Sublayer (FR-SSCS). The FR-SSCS is located in the upperpart of the ATM Adaptation Layer on top of theCommon Part Convergence Sublayer (CPCS) ofAAL type
25、 5, as specified in ITU-T (formerlyCCITT) Recommendation I.363, section 6. TheFR-SSCS is used at the B-ISDN TE to emulatethe Frame Relaying Bearer Service (FRBS) inB-ISDN. It is also used for interworking betweena B-ISDN and a Frame Relaying Network.2 Normative referencesThe following standards cont
26、ain provisionswhich, through reference in this text, consti-tute provisions of this American NationalStandard. At the time of publication, the edi-tions indicated were valid. All standards aresubject to revision, and parties to agreementsbased on this American National Standardare encouraged to inve
27、stigate the possibilityof applying the most recent editions of thestandards indicated below.CCITT Blue Book I.122 Recommendation,Framework for providing additional packetmode bearer service, ITU, Geneva, 19881)CCITT Recommendation I.233.1, Frame relaybearer services, 19911)CCITT Recommendation I.361
28、, ATM layer speci-fications, 19921)CCITT Recommendation I.370, Congestion man-agement in frame relaying networks, 19911)CCITT Recommendation I.372, Frame modebearer service network to network interfacerequirements, 19921)Page 1 of 2 pagesANSI T1.634-19931)Available from the American National Standar
29、ds Institute, 11 West 42nd Street, New York, NY 10036.BECN Backward Explicit CongestionNotificationB-ISDN Broadband Integrated ServicesDigital NetworkB-TE B-ISDN Terminal EquipmentCI Congestion IndicationC/R Command Response BitCPCS Common Part ConvergenceSublayerD/C Data or Control IndicationDE Dis
30、card EligibilityDLCI Data Link Connection IdentifierDL-CORE Data Link CoreEA Extended Address Field BitFECN Forward Explicit CongestionNotificationFCS Frame Check SequenceFMBS Frame Mode Bearer ServiceFR-SSCS Frame Relaying Service SpecificConvergence SublayerIWF InterWorking FunctionPDU Protocol Da
31、ta UnitSAR Segmentation and ReassemblySSCS Service Specific ConvergenceSublayerTE Terminal EquipmentVCI Virtual Channel IdentifierCCITT Recommendation Q.922, ISDN datalink layer specifications for frame mode bearerservices, 19911)CCITT Recommendation Q.933, DSS1 signal-ing specifications for frame m
32、ode basic callcontrol, ITU, Geneva, 19921)ITU-T (formerly CCITT), AAL Type 5,Recommendation text for I.363, section 3, 19931)ITU-T (formerly CCITT), RecommendationI.365.1, Frame relaying service specific con-vergence sublayer (FR-SSCS), 19931)ITU-T (formerly CCITT), RecommendationI.555, Frame relayi
33、ng bearer service inter-working, 19931)3 DefinitionsThe following terminology is used within thisdocument.International Telecommunication Union Telecommunication Standardization Sector(ITU-T): The ITU has been a specializedagency of the United Nations since 1948. Asthe oldest international treaty or
34、ganization, ittraces its formal beginning to 1865. ITU-Ttraces its formal beginning to 1954, when itspredecessor, the International Telegraph andTelephone Consultative Committee (CCITT)was founded for the purpose of promoting andensuring the operation of internationaltelecommunication systems.4 Abbreviations and acronymsAAL ATM Adaptation LayerATM Asynchronous Transfer ModePage 2 of 2 pagesANSI T1.634-1993
