1、 - STD-ITU-T RECMN X-32L-ENGL L99b II 48b2591 Ob27743 24b m INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU X.321 (1 0/96) SERIES X: DATA NETWORKS AND OPEN SYSTEM COMM UN I CATION Interworking between networks - General General arrangements for interworkin
2、g between Circuit-Switched Public Data Networks (CSPDNs) and Integrated Service Digital Networks (ISDNs) for the provision of data transmission services ITU-T Recommendation X.321 (Previously CCITT Recommendation) STD*ITU-T RECMN X.32L-ENGL L77b II 48b2571i Ob27744 182 ITU-T X-SEMES RECOMMENDATIONS
3、DATA NETWORKS AND OPEN SYSTEM COMMUNICATION PUBLIC DATA NETWORKS Services and facilities Interfaces Transmission, signalling and switching Network aspects Maintenance Administrative arrangements Model and notation Service definitions Connection-mode protocol specifications Connectionless-mode protoc
4、ol specifications PICS proformas Protocol Identification I Security Protocols INTERWORKING BETWEEN NETWORKS OPEN SYSTEM INTERCONNECTION Layer Managed Objects Conformance testing X. l-X. 199 X.1-X.19 X.20-X.49 X.50-X.89 X.90-X. 149 X.150-X. 179 X. 180-X. 199 X.200-X.299 X.200-X.209 X.210-X.219 X.220-
5、X.229 X.230-X.239 X.240-X.259 X.260-X.269 X.270-X.279 X.280-X.289 X.290-X.299 x.300-x.399 .y “-. *. , II Satellite data transmission systems MESSAGE HANDLING SYSTEMS DIRECTORY OS1 NETWORKING AND SYSTEM ASPECTS Networking Efficiency Naming, Addressing and Registration Abstract Syntax Notation One (AS
6、N.1) Systems Management framework and architecture Management Communication Service and Protocol Structure of Management Information Management functions OS1 MANAGEMENT SECURITY OS1 APPLICATIONS Commitment, Concurrency and Recovery Transaction processing Remote operations OPEN DISTRIBUTED PROCESSING
7、 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.7 10-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 refer to ITU-T List of Recommendations. F
8、OREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (IT). The IT-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecommunications on
9、 a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the IT-T Study Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the IT-T is cove
10、red by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). IT-T Recommendation X.321 was revised by IT-T Study Group 7 (1993-1996) and was approved under the WTSC Resolution No. 1 procedure on the 5th of October 1996. NOTE In this Recommendation, the expression “Administra
11、tion” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O IT 1997 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, w
12、ithout permission in writing from the IT. Recommendation X.321(10/96) 1 - STD-ITU-T RECMN X-32L-ENGL L77b I 48b259L Ob2774b T55 CONTENTS 1 2 7 11 Scope References Terms and definitions . Abbreviations . Conventions . General aspects . 6.1 CSPDN . 6.2 ISDN . 6.3 Call control between the CSPDN and ISD
13、N 6.4 Functionalities of the CSPDN and ISDN . Specific intenvorking arrangements . Interworking between CSPDN and ISDN where a packet switched bearer is requested . 7.1 7.1.1 Transfer of addressing information . 7.1.2 Arrangements for facilities related to the QOS of the call 7.1.3 Arrangements for
14、facilities related to charging conditions applying to the call 7.1.4 Arrangements for facilities related to specific routing conditions requested by the user . 7.1.5 Arrangements for facilities related to protection mechanisms requested by the user of a call . 7.1.6 Arrangements for facilities to co
15、nvey user data in addition to the normal data flow in the data transfer phase . 7.1.7 Arrangements for other facilities 7.1.8 Arrangements for internal network utilities (not visible for users) . Interworking between a CSPDN and ISDN where a circuit switched bearer is requested . 7.2.1 Transfer of a
16、ddressing information . 7.2.2 Arrangements related to QOS of the call 7.2.3 Arrangements for facilities related to the charging condition requested by the user of the call . 7.2.4 Arrangements for facilities related to specific routing conditions requested by the user of the call 7.2.5 Arrangements
17、for facilities related to protection mechanisms requested by the user of the call . 7.2.6 Arrangements for facilities to convey user data in addition to the normal data flow in the data transfer phase . 7.2.7 Arrangements for other facilities 7.2.8 Arrangements for internal network . Intenvorking be
18、tween CSPDN and ISDN where a fiame-relaying bearer is requested . 7.3.1 Transfer of addressing information . 7.3.2 Arrangements for facilities related to the QOS of the call 7.3.3 Arrangements for facilities related to charging conditions applying to the call 7.3.4 Arrangements for facilities relate
19、d to specific routing conditions requested by the user . 7.3.5 Arrangements for facilities related to protection mechanisms requested by the user of a call . 7.3.6 Arrangements for facilities to convey user data in addition to the normal data flow in the data transfer phase . 7.3.7 Arrangements for
20、other facilities 7.3.8 Arrangements for intemal network utilities (not visible for users) . 7.2 7.3 Recommendation X.321(10/96) Page 1 1 2 2 2 2 2 3 3 3 3 4 4 4 4 5 5 6 6 6 7 7 7 7 SUMMARY This Recommendation defines general arrangements for the interworking between CSPDNs and ISDNs for the provisio
21、n of data transmission services. These arrangements are applicable only to the interworking involving transmission capabilities, and not to interworking involving communication capabilities as described in Recommendation X.300. INTRODUCTION This Recommendation is one of a set of Recommendations prod
22、uced to facilitate considerations of interworking between networks. It is based on Recommendation X.300, which defines the general principles for interworking between public networks, and between public networks and other networks for the provision of data transmission services. Recommendation X.3 O
23、0 indicates in particular how collections of physical equipment can be represented as “subnetworks” for consideration in interworking situations. This Recommendation describes the interworking arrangements between ISDNs and CSPDNs for the provision of data transmission services. . Recommendation X.3
24、21 (10/96) 111 STD-ITU-T RECMN X.321-ENGL 179b = 48b25731 Ob27748 828 Recommendation X.321 GENERAL ARRANGEMENTS FOR INTERWORKING BETWEEN INTEGRATED SERVICE DIGITAL NETWORKS (ISDNs) FOR THE PROVISION OF DATA TRANSMISSION SERVICES CIRCUIT-SWITCHED PUBLIC DATA NETWORKS (CSPDNS) AND (Melbourne, 1988; re
25、vised in 1996) 1 Scope The purpose of this Recommendation is to describe the general arrangements for the interworking between CSPDNs and ISDNs for the provision of data transmission services. These arrangements are applicable only to the interworking involving transmission capabilities, and not to
26、interworking involving communication capabilities as described in Recommendation X.300. NOTE -The typing of subnetworks in this Recommendation is based on the support for the OS1 connection-mode network service and is therefore only valid in this context. 2 References The following Recommendations a
27、nd other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject to revision; all users of this Recommendation are therefore
28、encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid IT-T Recommendations is regularly published. - - - CCITT Recommendation E.164 (1991), Numberingplan for the ISDN era. IT-T Recommendat
29、ion E. 166K.122 (1996), Numberingplan interworking for the E.164 andXI2I. 1.230-Series Recommendations, Integrated services digital network - Service capabilities - Bearer services supported by an ISDN. - 1.250-Series Recommendations, Integrated services digital network - Service capabilities - Supp
30、lementary services in ISDN. IT-T Recommendation 1.500 (1993), General structure of the ISDN interworking Recommendations. ITU-T Recommendation X. 1 (1996), International user classes of service in, and categories of access to, public data networks and Integrated Services Digital Networks (ISDNs). IT
31、-T Recommendation X.2 (1 996), International data transmission services and optional user facilities in public data networks and ISDNs. ITU-T Recommendation X.10 (1993), Categories of access for Data Terminal Equipment (DTE) to public data transmission services. IT-T Recommendation X.3 1 ( 1999, Sup
32、port of packet mode terminal equipment by an ISDN. IT-T Recommendation X.75 (1 996), Packet-switched signalling system between public networks providing data transmission services. IT-T Recommendation X.76 (1 999, Network-to-network interface between public data networks providing the fiame relay da
33、ta transmission service. ITU-T Recommendation X.121 (1996), International numberingplan for public data networks, IT-T Recommendation X.300 (1996), General principles for intenvorking between public networks and between public networks and other networks for the provision of data transmission servic
34、es. ITU-T Recommendation X.301 (1996), Description of the general arrangements for call control within a subnetwork and between subnetworks for the provision of data transmission services. - - - - - - - - - - Recommendation X.321 (10/96) 1 STD-ITU-T RECMN X-32L-ENGL L79b 9 g8b257L Ob27750 48b 9 - CC
35、ITT Recommendation X.302 (1988), Description of the general arrangements for internal network utilities within a subnetwork and intermediate utilities between subnetworks for the provision of data transmission services. CCITT Recommendation X.305 (1988), Functionalities of subnetworks relating to th
36、e support of OSI connection-mode network service. - 3 Terms and definitions This Recommendation makes use of the following terms defined in Recommendation X.300: a) transmission capability; b) communication capability; c) subnetwork functionality; d) data transmission service. This Recommendation ma
37、kes use of the following terms defined in the 1.230-Series Recommendations: a) circuit switched bearer service; b) c) fiame-relaying bearer service. packet switched virtual circuit bearer service; 4 Abbreviations For the purposes of this Recommendation, the following abbreviations apply: CNIC Cleari
38、ng Network Identification Code CUG Closed User Group CUG/OA DTE Data Terminal Equipment ISDN Integrated Services Digital Network IWF Interworking Function MSS Mobile Satellite System PSPDN SS No. 7 TA Terminal Adaptor TE Terminal Equipment TNIC Transit Network Identification Code Closed User Group w
39、ith Outgoing Access Packet Switched Public Data Network Signalling System No. 7 5 Conventions No particular conventions are used. 6 General aspects This Recommendation, in describing interworking arrangements between two subnetworks for the provision of data transmission services, adheres to the gen
40、eral principles of Recommendation X.300. The environments of these two subnetworks are described in the following subclauses. See also Table 1. 6.1 CSPDN The CSPDN provides circuit switched data transmission services as defined in Recommendations X.l and X.2 for the provision of data transmission se
41、rvices, the CSPDN may be accessed by DTEs by the category of access B as defined in 2 Recommendation X.321(10/96) Recommendation X.l. In addition, the CSPDN may also be accessed via other networks, i.e. PSPDN (see X.l, categories C, D and Recommendation X.79, MSS (see Recommendation X.75), or ISDN (
42、this Recommendation). Private network access to the CSPDN is for further study (see Recommendation X.300). 6.2 ISDN The ISDN may provide packet switched and/or circuit switched and/or frame-relaying data transmission serviceshearer services as defined in Recommendations X.l, 1.230-Se1ies, and X.2. N
43、OTE 1 - Supplementary services/optional user facilities for the circuit-mode operation on ISDN are in the 1.250-Series Recommendations. Recommendation X.2 applies to ISDN packet switched data transmission serviceshearer services. NOTE 2 - Supplementary services/optional user facilities for the frame
44、-relaying operation on ISDN are for further study. For the provision of data transmission services, the ISDN may be accessed by DTEsTEs by the categories of access S, T, U as defined in Recommendation X.l andor the access methods defined in the 1.230-Series Recommendations. In addition, the ISDN may
45、 also be accessed via other networks, i.e. PSTN (see Recommendation I.530), CSPDN (see X.l, category B, and this Recommendation), PSPDN (see Recommendations X.325 and X.l, categories C, D), MSS (see Recommendation X.324), or ISDN (SS No. 7, see Recommendations X.75 and X.l, category Y). NOTE 3 - In
46、the context of this Recommendation, and for the purpose of provision of data transmission services only, the following categories of bearer services defined in the 1.230-Series Recommendations are considered (others are for further study): a) b) c) d) e) fiame-relaying bearer service. circuit-mode 6
47、4 kbit/s unrestricted, 8 kHz, structured, circuit-mode 64 kbih 8 kHz structured, usable for speech information transfer; circuit-mode 64 kbit/s 8 kHz structured, usable for 3.1 kHz audio information transfer; virtual call and permanent virtual circuit; 6.3 Call control between the CSPDN and ISDN The
48、 general arrangements for call control between the CSPDN and ISDN are as defined in Recommendation X.301. Network utilities used between the CSPDN and ISDN are as defined in Recommendation X.302 (not visible for users). Supplementary servicedoptional user facilities for the circuit-mode operation on
49、 ISDN are in the 1.250-Series Recommendations. NOTE - Supplementary servicedoptional user facilities for the frame-relaying operation on ISDN are for further study. 6.4 Functionalities of the CSPDN and ISDN The functionalities of different types of subnetworks are described in Recommendation X.305. In the case where the ISDN is used to provide a packet switched or fiame-relaying data transmission servicehearer service, the functionality of the CSPDN and ISDN differ. Therefore, in order to enable interworking, procedures must be operated over the circuit switc
