1、STD-ITU-T RECMN X-3-ENGL 177b m 48b259L Ob33b12 TZ0 INTERNATIONAL TELECOMMUNICATION UN ION ITU-T TELECOM MU N I CATI ON STANDARDIZATION SECTOR OF ITU X.300 (1 0196) SERIES X: DATA NETWORKS AND OPEN SYSTEM CO MM U N ICATIO N Interworking between networks - General General principles for interworking
2、between public networks and between public networks and other networks for the provision of data transmission services ITU-T Recommendation X.300 (Previously CCITT Recommendation) STD-ITU-T RECMN X.300-ENGL 177b D 4Bb2591 Ob33bL3 7b7 m ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COM
3、MUNICATION X.l-X.199 PUBLIC DATA NETWORKS Services and facilities X. 1-X.19 Interfaces X .20-X .49 Transmission, signalling and switching X.50-X.89 Network aspects X.90-X. 149 Maintenance X.150-X. 179 Administrative arrangements X.180-X.199 OPEN SYSTEM INTERCONNECTION X.200-X.299 Model and notation
4、X .200-X . 209 Service definitions X.210-X.219 Connection-mode protocol specifications X.220-X.229 Connectionless-mode protocol specifications X.230-X.239 PICS proformas X.240-X.259 Protocol Identification X.260-X.269 Security Protocols X.270-X.279 Layer Managed Objects X.280-X.289 Conformance testi
5、ng X.290-X.299 INTERWORKING BETWEEN NETWORKS X.300-X.399 Satellite 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 architectu
6、re 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 X.350-X.399 X.400-X.499 X.500-X.599 X .600-X. 6
7、99 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.719 X.720-X.729 X.730-X.799 X .80O-X. 849 X.850-X.899 X.850-X.859 X.860-X.879 X.880-X.899 X.900-X.999 IL For further details, please refer to ITU-T List of Recommendations. STD-ITU-T RECMN X.300-ENGL 199b = 4Ab259L
8、Ob33bLi AT3 FOREWORD The ITU-T (Telecommunication Standardization Sector) is a permanent organ of the International Telecommunication Union (IT). The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommen- dations on them with a view to standardizing telecom
9、munications 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 Recommendations on these topics. The approval of Recommendations by the Members of t
10、he IT-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, March 1-12, 1993). IT-T Recommendation X.300 was revised by ITU-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 expres
11、sion “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 utilized in any form or by any means, electronic or mechanical, including photocopying
12、 and microfilm, without permission in writing from the ITU. Recommendation X.300 (10/96) 1 STD-ITU-T RECMN X.300-ENGL 197b YBb2571 Ob33b15 73T m O 1 2 3 4 5 6 7 8 CONTENTS Page Introduction Scope and field of application References Definitions 3.1 3.2 Terminology defined in other Recommendations . T
13、erminology defined in this Recommendation . 3.3 Graphical conventions Abbreviations . Networks to be interconnected and data transmission services to be offered 5.1 Packet Switched Public Data Network (PSPDN) . 5.2 Circuit Switched Public Data Network (CSPDN) 5.3 Frame Relay Public Data Network (FRP
14、DN) . 5.4 Integrated Services Digital Network (ISDN) 5.5 Public Switched Telephone Network (PSTN) 5.6 Common Channel Signalling Network (CCSN) . 5.7 Public mobile systems 5.8 Private networks . Principles for interworking involving transmission capabilities only Composition and decomposition of subn
15、etworks . 6.2 Categories of interworking . Relationships with respect to management . Basic principles in relation with service indication parameters 6.1 6.3 6.4 6.5 Principles interworking involving both transmission and communication capabilities . 7.1 Composition and decomposition of application
16、relay systems . 7.3 Identification of application relay system types . 7.4 Relation between application IWJ?, networks and application relay system types . 7.5 7.6 7.7 7.8 7.9 Description of the different interworking conditions . 8.1 General 8.2 Interworking via a non-OS1 adapter between PSTN and P
17、SPDN 8.3 Interworking involving ISDN for the provision of data transmission services Categorization of subnetworks with respect to the support of the OSI-NS 7.2 Categories of interworking . Interconnection of application relay system types : . Use of application relay system types . Relationships wi
18、th respect to management . Relationships with the Reference Model of OS1 for ITU-T applications . Basic principles in relation with service indication parameters Annex A . Basic categories of subnetworks . A.l Type I subnetwork A.2 Type II subnetwork . A.3 Type III subnetwork . A.4 Type IV subnetwor
19、k . iv 1 1 4 4 4 9 12 12 13 13 13 13 14 14 15 16 16 16 23 24 28 28 28 31 35 35 35 35 38 38 38 38 38 38 39 42 43 43 43 45 45 11 Recommendation X.300 (10196) STD-ITU-T RECMN X.300-ENGL L77b W 4862593 Ob33bLb b7b Page Annex B . Examples of subnetwork compositions . 46 B.l Examples of Type I and Type II
20、 interconnection . 46 B.2 Type I . Type III interconnection . 46 B.3 Type II - Type III interconnection . 48 B.4 Type IV - Type I interconnection . 50 Recommendation X.300 (10/96) . 111 STD-ITU-T RECMN X.300-ENGL L99b 48b257I.I Ob33bI.17 502 D SUMMARY This Recommendation defines principles and detai
21、led arrangements for the interworking of different networks in order to provide a data transmission service. This Recommendation also specifies, in a general network context, the necessary interaction between elements of user interfaces, interexchange signalling systems and other network functions f
22、or the support of data transmission services, telematic services and the OS1 connection-mode network service where appropriate. In addition, it defines the principle for realization of international user facilities and network utilities for data transmission services. O Introduction 0.1 The rapid ev
23、olution of data transmission services has resulted in a large number of international standards in this field. The increasing complexity of the totality of these standards creates a need to rationalize common aspects in order to achieve a coherent relationship between these standards. 0.2 Data trans
24、mission services and user facilities may be provided by different types of public networks such as, PDNs and Integrated Services Digital Networks (ISDN) (see also Recommendations 1.500 and 1.510). As a result, there may be a demand to interconnect these networks in order for a DTE on one network to
25、communicate in a uniform way with a DTE on the same network, or with a DTE on another network of the same type, or with a DTE on a network of another type. 0.3 The internetwork signalling between the various types of networks can be of the type defined by Recommendations such as, X.70, X.71, X.75, o
26、r of the common channel signalling type such as, Recommendation X.61. In particular, at an internetwork signalling interface, network utilities may be exchanged between the networks involved. These network utilities may be handled by different types of networks. 0.4 In addition, as a part of the sco
27、pe of Recommendation X.200 (Reference Model of Open Systems Interconnection for ITU-T applications) is to enable different users to communicate with each other by encouraging the implementation of compatible communication features, the use of this reference model is expected to be encouraged in futu
28、re user terminal designs. 0.5 As defined by this reference model, one of the major functions of the network layer is to establish a network- connection between network-service users (within end systems). This may involve the concatenation of dissimilar networks. Therefore, the arrangements and proce
29、dures for internetwork signalling between PDNs and other public networks should provide the user with the capability to operate data transmission services, telematic services and the OS1 connection- mode network service over the connections derived over either one network, or over concatenated netwo
30、rks. NOTE - This does not imply that any individual public network is required to implement all the mechanisms related to the OS1 connection-mode network service. 0.6 the relevant interworking Recommendations, which are grouped under three main categories: This Recommendation is one of a family of i
31、nterworking Recommendations. Figure 0-1 gives a summary of a) general aspects of interworking; b) c) description of each interworking case; description of internetwork signalling interfaces. iv Recommendation X.300 (1096) STD-ITU-T RECMN X-300-ENGL 177b tiBb2571 Ob33bLB L(L(7 D I I I I I I I I I I I
32、 I I I I I I I I ml I I I I I I I l I I I m c O o) c .- - .- g e al C - 8 ._ h B x c O z B E 8 Q k Recommendation X.300 (10/96) V Recommendation X.300 GENERAL PRINCIPLES FOR INTERWORKING BETWEEN PUBLIC NETWORKS AND BETWEEN PUBLIC NETWORKS AND OTHER NETWORKS FOR THE PROVISION OF DATA TRANSMISSION SER
33、VICES (Former Recommendation X.87, Geneva, 1980; amended at Malaga-Torremolinos, 1984 and Melbourne, I988; revised in 1996) 1 Scope and field of application 1.1 Interworking between more than two networks is included in the scope of this Recommendation. 1.2 The scope of this Recommendation is: - To
34、define principles and detailed arrangements for the interworking of different networks in order to provide a data transmission service. To specifi, in a general network context, the necessary interaction between elements of user interfaces, interexchange signalling systems and other network function
35、s; for the support of data transmission services, telematic services and the OS1 connection-mode network service where appropriate. - NOTE - The support for OS1 connectionless-mode network service as defined in ISOiEC 8348/hd.I is for further study. To define the principles for realization of intern
36、ational user facilities and network utilities for data transmission services. - 2 References The following Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated w
37、ere valid. All Recommendations and other references are subject to revision: all users of this Recommendation are therefore 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 ITU-T Reco
38、mmendations is regularly published. ITU-T Recommendation I. 1 12 (1 993), Vocabulary of termsfor ISDNs. ITU-T Recommendation 1.2 1 O (1 993), Principles of telecommunication services supported by an ISDN and the means to describe them. 1.230-Series Recommendations, Integrated services digital networ
39、k - Service capabilities - Bearer services supported by an ISDN. 1.240-Series Recommendations, Integrated services digital network - Service capabilities - Teleservices supported by un ISDN. 1.250-Series Recommendations, Integrated services digital network - Service capabilities - Supplemen- tary se
40、rvices in ISDN. CCIT Recommendation 1.340 (1988), ISDN connection types. ITU-T Recommendation 1.4 1 1 (1 993), ISDN user-network interfaces - Reference configurations. CCITT Recommendation 1.420 (1984). Basic user-network interface. CCITT Recommendation 1.421 (1984), Primary rate user-network interf
41、ace. IT-T Recommendation 1.500 (1993), General structure of the ISDN interworking Recommendations. ITU-T Recommendation 1.5 1 O (1993), Defnitions and general principlesfor ISDN interworking. - - - - - - - - - - - Recommendation X.300 (10/96) I STDmITU-T RECMN X-300-ENGL 199b 9 VBb2591 Ub33b20 UT7 2
42、 - Q.700-Series Recommendations, Switching and signalling - Spec$cations of Signalling System No. 7. - IT-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). - ITU-T Recommendation
43、 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. CCITT Recommendation X.20 (1988), Interface between Da
44、ta Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for start-stop transmission services on public data networks. CCITT Recommendation X.20 bis (1988), Use on public data networks of Data Terminal Equipment (DTE) which is designed for interfacing to asynchronous duplex V-Series
45、modems. CCITT Recommendation X.21 (1992), 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 inte
46、rfacing to synchronous V-Series modems. - - - - - - CCITT Recommendation X.22 (1988), Multiplex DTEIDCE interface for user classes 3-6. - ITU-T Recommendation X.25 (1996), Interface between Data Terminal Equipment (DTE) and data circuit-terminating equipment (DCE) for terminals operating in the pack
47、et mode and connected to public data networks by dedicated circuit. - ITU-T Recommendation X.28 (1993), DTEDCE interface for a start-stop mode Data Terminal Equipment accessing the Packet AssernblyiDisassembly (PAD) facility in a Public Data Network situated in the same country. - ITU-T Recommendati
48、on X.29 (1993), Procedures for the exchange of control information and user data between a Packet AssembIyDisassembly (PAD) facilis and a packet-mode DTE or another PAD. - IT-T Recommendation X.30A.461 (1993), Support 0fX-21, X.21 bis andX.20 bis based Data Terminal Equipments (DTEs) by an Integrate
49、d Services Digital Network (ISDN). ITU-T Recommendation X.3 1A.462 (1995), Support ofpacket mode terminal equipment by an ISDN. - - ITU-T Recommendation X.32 (1996), Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) 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. - CCITT Recommendation X.60 (1988), Common channel signalling for circuit switched data applications
