1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU x.33 ( 0196) SERIES X: DATA NETWORKS AND OPEN SYSTEM COM M U N I CATI O N Public data networks - Interfaces Access to packet switched data transmission services via frame relaying data transmission services I
2、TU-T Recommendation X.33 (Previously “CCIlT Recommendation“) ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATION Services and facilities X. l-X. 19 Transmission, signalling and switching X.50-X.89 Network aspects X.90-X. 149 Maintenance X.150-X.179 Administrative arrangements
3、X. 180-X.199 )PEN SYSTEM INTERCONNECTION X.200-X.299 Model and notation X.200-X.209 Service definitions Connection-mode protocol specifications Connectioniess-mode protocol specification PICS proformas Protocol Identification Security Protocols Layer Managed Objects Conformance testing General Satel
4、lite data transmission systems MESSAGE HANDLING SYSTEMS DIRECTORY OS1 NETWORKING AND SYSTEM ASPECTS Networking Efficiency Naming, Addressing and Registration Abstract Syntax Notation One (ASN. 1) Systems Management framework and architecture Management Communication Service and Protocol Structure of
5、 Management Information Management functions NTERWORKING BETWEEN NETWORKS OS1 MANAGEMENT SEC U RIT Y OS1 APPLICATIONS Commitment, Concurrency and Recovery Transaction processing Remote operations OPEN DISTRIBUTED PROCESSING X.210-X.219 X.220-X.229 X.230-X.239 X.240-X.259 X.260-X.269 X.270-X.279 X.28
6、0-X.289 X.290-X.299 X.300-X.399 X.300-X.349 X.350-X.399 X.400-X.499 X.500-X.599 X.600-X.699 X.600-X.629 X.630-X.649 X.650-X.679 X.680-X.699 X.700-X.799 X.700-X.709 X.710-X.7 19 X.720-X.729 X.730-X.799 X.800-X.849 X.850-X.899 X.850-X.859 X.860-X.879 X.880-X.899 X.900-X.999 For further details, please
7、 refer to ITU-T List of Recommendations. STD-ITU-T RECMN X.33-ENGL L77b = Li8b257L Ob22Lib5 bu8 FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (ITU). The ITU-T is responsible for studying technical, operating and tariff
8、 questions and issuing Recommen- dations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the ITU-T Study Groups which, in their turn, produce
9、 Recommendations on these topics. The approval of Recommendations by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). ITU-T Recommendation X.33 was prepared by ITU-T Study Group 7 (1993-1996) and was approved under the WTSC Resolut
10、ion No. 1 procedure on the 5th of October 1996. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1997 All rights reserved. No part of this publication may be reproduced or
11、 utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the ITU. 1 Recommendation X.33 (10/96) 1 2 3 4 5 6 7 8 9 10 11 II CONTENTS Page Scope and field of operation References Definitions 3.1 Frame Relay Service defini
12、tions . 3.2 Packet Switched Service definitions . 3.3 Bearer Service definitions . 3.4 ISDN definitions . 3.5 Interworking Definitions Abbreviations . General service aspects Reference configurations . 6.1 6.2 6.3 Configuration when accessing PSPDN via an FRFDN Configuration when accessing PSPDN usi
13、ng the ISDN fiame relaying services . Configuration when Accessing the Packet Switched Data Transmission Services of ISDN via an FRPDN . Configuration when Accessing the Packet Switched Data Transmission Services of ISDN using 6.4 the ISDN Frame Relaying Services Service aspects . Access to PSDTS vi
14、a an FRPDN . Access to PSDTS using the ISDN Frame Relaying Services . 7.1 7.2 Addressing and routing aspects Access to PSDTS via an FRPDN . Access to PSDTS using the ISDN Frame Relaying Services . Interworking with dedicated networks . Access to PSDTS via an FRFDN . Access to PSDTS using the ISDN Fr
15、ame Relaying services 8.1 8.2 9.1 9.2 Procedures 1 O . 1 Access to PSDTS via an FRPDN . 10.2 Access to PSDTS using the ISDN Frame Relaying Services . Terminal Adaptor functionalities . 11.1 General 11.2 Access to PSDTS via an FRPDN . 11.3 Access to PSDTS using ISDN-FR Recommendation X.33 (10/96) 1 1
16、 2 2 3 3 3 3 3 4 5 5 7 9 10 10 10 12 14 14 15 17 17 18 18 18 21 29 29 29 35 STDmITU-T RECMN X-33-ENGL 177b 48b2571 Ob224b7 480 = STD-ITU-T RECMN X.33-ENGL L99b 48b257L Ob22Lib8 317 SUMMARY This Recommendation defines services available and signalling procedures operated at the S/T reference point of
17、 an ISDN and at the DTE-DCE interface of an FRPDN for access to packet switched data transmission service via the ISDN-FRBS and the FRPDN. . 111 Recommendation X.33 (10/96) - STD-ITU-T RECMN X.33-ENGL L77b 4Ab257L Ob22470 T75 Recommendation X.33 ACCESS TO PACKET SWITCHED DATA TRANSMISSION SERVICES V
18、IA FRAME RELAYING DATA TRANSMISSION SERVICES (Geneva, 1996) 1 The purpose of this Recommendation is to specifi the access to Packet Switched Data Transmission Services (PSDTS) provided by a Packet Switched Public Data Network (PSPDN) or an Integrated Services Digital Network (ISDN) via Frame Relay D
19、ata Transmission Services (FRDTS) provided by a Frame Relay Public Data Network (FRPDN) or an ISDN. Scope and field of operation 2 Refer en ces The following Recommendations 1 Intemational Standards contain provisions which, through reference in this text, constitute provisions of this Recommendatio
20、n. At the time of publication, the editions indicated were valid. All Recommendations I International Standards are subject to revision; all users of this Recommendation are encouraged to investigate the possibility of applying the most recent editions of the Recommendations 1 International Standard
21、s listed below. A list of the currently valid ITU-T Recommendations is regularly published. IT-T Recommendation X. 1 (1 996), International user classes of service in, and categories of access to, public data networks and Integrated Services Digital Networks (ISDNs). CCITT Recommendation X.21 (1992)
22、, Interface between data terminal equipment and data circuit- terminating equipment for synchronous operation on public data networks. CCITT Recommendation X.21 bis (1988), Use on public data networks of Data Terminal Equipment (DTE) which is designed for interfacing to synchronous V-Series modems.
23、ITU-T Recommendation X.25 (1996), Interface between Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment (XE) for terminais operating in the packet mode and connected to public data networks by dedicated circuit. IT-T Recommendation X.30A.461 (1993), Support ofX21, X21 bis andX20 bis
24、 based Data Terminal Equipments (DTEs) by an Integrated Services Digital Network. IT-T Recommendation X.3 1A.462 (1995), Support ofpacket mode terminal equipment by an ISDN. IT-T Recommendation X.32 (1996), Interface between Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment (DCE)
25、for terminals operating in the packet mode and accessing a packet switched public data network through a public switched telephone network or an integrated services digital network or a circuit switchedpublic data network. IT-T Recommendation X.36 (1995)iAmendment 1 (1996), Interface between Data Te
26、rminal Equipment (DTE) and Data Circuit-Terminating Equipment (DCE) for public data networks providing fiame relay data transmission service by dedicated circuit - Amendment I: Switched Virtual Circuit (SVC) signalling and refinements of Permanent Virtual Circuit (P VC) signalling. ITU-T Recommendat
27、ion X.75 (1 996), Packet-switched signalling system between public networks providing data transmission services. ITU-T Recommendation X.76 (1 995) Amendment 1 1, Network-to-network interface between public data networks providing the fiame relay data transmission service. IT-T Recommendation X.121
28、(1996), International numbering plan for public data networks. - - - - - - - - - - - - ) Presently at the stage of draft. Recommendation X.33 (10/96) 1 STD-ITU-T RECMN X-33-ENGL L77b Li8b257L Ob22Li7L 701 - ITU-T Recommendation X. 122E.166 (1996), Numbering plan interworking for the E. 164 and XI21
29、numbering plans. - ITU-T Recommendation X.213 (1995) I ISO/IEC 8348 (1996), Information technology - Open Systems Interconnection -Network service deflnition. ITU-T Recommendation X.300 (1996), General principles for interworking between public networks and between public networks and other networks
30、 for the provision of data transmission services. ITU-T Recommendation X.320 ( 1996), General arrangements for interworking between Integrated Services Digital Networks (ISDNS) for the provision of data transmission services. ITU-T Recommendation X.3250.550 (1996), General arrangements for interwork
31、ing between Packet Switched Public Data Networks (PSFDNs) and Integrated Services Digital Networks (ISDNs) for the provision of data transmission services. ITU-T Recommendation X.328 (1996), General arrangements for interworking between public data networks providing fiame relay data transmission se
32、rvices and Integrated Services Digital Networks (ISDN) for the provision of data transmission services. ITU-T Recommendation Q.922 (1992), ISDN data link layer specijication for fiame mode bearer services. - - - - - - ITU-T Recommendation 4.93 1 (1993), Digital Subscriber Signalling System No. I (DS
33、SI) - ISDN user- network interface layer 3 specification for basic call control. ITU-T Recommendation 4.933 (1993), Digital Subscriber Signalling System No. 1 (DSSl) -Signalling specifcation for frame mode basic call control. ITU-T Recommendation 1.21 1 (1993), B-ISDN service aspects. CCITT Recommen
34、dation 1.230 (1988), Dejnition of bearer service categories. CCITT Recommendation 1.233.1 (1991), ISDNframe relaying bearer service. ITU-T Recommendation I .4 1 1 (1 993), ISDN user-network interfaces - Reference configurations. ITU-T Recommendation 1.430 (1993), Basic user-network interface -Layer
35、1 specifcation. ITU-T Recommendation 1.43 1 (1993), Primary rate user-network interface - Layer I speczjcation. ITU-T Recommendation 1.555 (1 993), Frame relaying bearer service interworking. Recommendations 1.600-Series - Maintenance principles. CCITT Recommendation E. 164 (1991), Numberingplan for
36、 the ISDN era. CCITT Recommendation V.25 bis (19SS), Automatic calling and/or answering equipment on the General Switched Telephone Network (GSm) using the 100-Series interchange circuits. - - - - - - - - - - - 3 Definitions 3.1 Frame Relay Service definitions The following terms are defined in Reco
37、mmendations X.36 and Q.933: - Frame Relay Switched Virtual Circuit. - Permanent Virtual Circuit. The following terms are defined in Recommendation X. 1 : - Frame Relay Data Transmission Services. - Frame Relay Public Data Network. 2 Recommendation X.33 (10/96) STD-ITU-T RECMN X.33-ENGL L77b m 48b257
38、L 0b22Li72 848 m 3.2 Packet Switched Service definitions The following terms are defined in Recommendation X.25: - Permanent Virtual Circuit. - Virtual Call. The following terms are defined in Recommendations X.l and X.300: - - Packet Switched Data Transmission Services. Packet Switched Public Data
39、Network. 3.3 Bearer Service definitions The following terms are defined in Recommendations 1.230 and 1.233.1 : - Circuit Switched Bearer Service. - - Frame Mode Bearer Service. Packet Switched Virtual Circuit Bearer Service. 3.4 ISDN definitions The following terms are defined in Recommendation 1.41
40、 1: - R reference Point. - Sf Reference Point. 3.5 Interworking Definitions The following terms are defined in Recommendations X.300 and 1.555: - Encapsulation Function. - - Interworking by Port Access. Interworking by Call Control Mapping. 4 Abbreviations For the purposes of this Recommendation, th
41、e following abbreviations are used. AU Access Unit BECN Backward Explicit Congestion Notification C/R CommandBesponse CSBS Circuit Switched Bearer Service DDI Direct-Dialling- In DE Discard Eligibility DLC Data Link Connection DLCI Data Link Connection Identifier DNIC Data Network Identification Cod
42、e DTP Data Transfer Phase EA Extension Address ET Exchange Termination FCS Frame Check Sequence FECN Forward Explicit Congestion Notification FH Frame Handler 3 Recommendation X.33 (10/96) STD*ITU-T RECMN X-33-ENGL 1996 4862573 0622473 78q FRBS FRDTS FRPDN GSTN HDLC IEC ISDN IS0 ITU-T IWF QOS LAPB L
43、APF MSN NSAP NT os1 PDN PH PLP PMBS PSDTS PSPDN PVC SAP1 svc TA TE Frame Relay Bearer Service Frame Relay Data Transmission Services Frame Relay Public Data Network General Switched Telephone Network High Level Data Link Control International Electrotechnical Commission Integrated Services Digital N
44、etwork International Organization for Standardization Intemational Telecommunication Union - Telecommunication Standardization Sector InterWorking Function Quality of Service Link Access Procedure Balanced Link Access Procedure for Frame Mode Bearer Service Multiple Subscriber Number Network Service
45、 Access Point Network Termination Open Systems Interconnection Public Data Network Packet Handler Packet Layer Procedures Packet Mode Bearer Service Packet Switched Data Transmission Services Packet Switched Public Data Network Permanent Virtual Circuit Service Access Point Identifier Switched Virtu
46、al Circuit Terminal Adaptor Terminal Equipment 5 General service aspects Packet Switched Data Transmission Services (PSDTS) are provided by Packet Switched Public Data Networks (PSPDNs) and integrated Services Digital Networks (ISDNs). These PSDTS may be accessed by users of Frame Relay Public Data
47、Networks (FRPDNs) andor ISDNs providing Frame Relay Data Transmission Services (FRDTS). NOTE - In this Recommendation, a Public Data Network (PDN) providing FRDTS will be referred to as FRPDN. a) This Recommendation defines the aspects of packet switched data transmission services provided by a PSPD
48、N to the users of FRPDN in accordance with the services defined in Recommendations X.36 andX.l. 4 Recomrnenda tion X.33 (10/96) This Recommendation defines the aspects of packet switched data transmission services provided by a PSPDN to the users of ISDN providing FRDTS in accordance with the servic
49、es defined in Recommen- dations X.36 and X. 1. This Recommendation defines the aspects of packet switched data transmission services provided by an ISDN to the users of FRPDN in accordance with the services defined in Recommendations X.36 and X. 1. This Recommendation defines the aspects of the packet switched data transmission services provided by an ISDN to the users of ISDN providing FRDTS in accordance with the services defined in Recommendation 1.233.1. This Recommendation defines the procedures at the user-network interface of an FRPDN to access packet switched d
