1、STD.ITU-T RECMN X=320-ENGL L99b Vb259L Ob27722 511 S INTERNATIONAL TELECOMMUNICATION UNION ITUDT TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU X.320 (I 0/96) SERIES X: DATA NETWORKS AND OPEN SYSTEM COM M U N I CATI ON Interworking between networks - General General arrangements for interworking be
2、tween integrated services digital networks (ISDNs) for the provision of data transmission services ITU-T Recommendation X.320 (Previously CCITT Recommendation - STD=ITU-T RECMN X-320-ENGL 177b 48b257L Ob27723 458 - ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATION PUBLIC DAT
3、A 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 protocol specifications PICS proformas Protocol Identificati
4、on Security Protocols Layer Managed Objects Conformance testing OPEN SYSTEM INTERCONNECTION X.1-X.199 X.1-X.19 X.20-X.49 X.50-X.89 X.90-X. 149 X.150-X. 179 X. 1 80-X. 199 X.200-X.299 X.200-X.209 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.280-X.289 X.290-X.299 INTERWORK
5、ING 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 architecture Management Communicat
6、ion 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.699 X.600-X.629 X.630-X.649
7、 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.800-X.849 X.850-X.899 X.850-X.859 X.860-X.879 X.880-X.899 x.9wx.999 Forjrther details, please refer to ITU-T List of Recommendations. FOREWORD The IT-T (Telecommunication Standardization Sector) is a permanent org
8、an 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 telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WT
9、SC), 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 the ITU-T is covered by the procedure laid down in WTSC ResolutionNo. 1 (Helsinki, March 1-12
10、, 1993). ITU-T Recommendation X.320, 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 “Administration” is used for conciseness to indicate both a telecommunication administ
11、ration 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 and microfilm, without permission in writing from the IT. Recommendation X.320 (10/96) 1 1
12、 2 3 4 5 6 7 11 CONTENTS Page Scope References Terms and definitions . Abbreviations . Conventions General aspects . 6.1 ISDN . 6.2 Call control between ISDNs . 6.3 Functionalities of the ISDN Specific interworking arrangements . 7.1 7.2 7.3 Interworking between ISDNs . where a packet switched beare
13、r is requested on each . 7.1.1 7.1.2 7.1.3 7.1.4 7.1.5 7.1.6 7.1.7 7.1.8 Arrangements for internal network utilities (not visible for users) . Interworking between ISDNs where a circuit switched bearer is requested on each . 7.2.1 7.2.2 Arrangements for facilities related to QOS of the call 7.2.3 Ar
14、rangements for facilities related to changing conditions applying to the call . 7.2.4 Arrangements for facilities related to specific routing conditions requested by the user of the call . 7.2.5 Arrangements for facilities related to protection mechanisms requested by the user of a call . 7.2.6 Arra
15、ngements 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 utilities Transfer of addressing information . Arrangements for facilities related to the QOS of the call Arran
16、gements for facilities related to charging conditions applying to the call Arrangements for facilities related to specific routing conditions requested by the user of the call . Arrangements for facilities related to protection mechanisms requested by the user of the call . Arrangements for faciliti
17、es to convey user data in addition to the normal data flow in the data transfer phase . Arrangements for other facilities Transfer of addressing information . Interworking between ISDNs where a fiame relaying bearer is used on each . Transfer of addressing information . 7.3.1 7.3.2 7.3.3 7.3.4 7.3.5
18、 7.3.6 7.3.7 7.3.8 Arrangements for facilities related to QOS of the call Arrangements for facilities related to changing conditions applying to the call . Arrangements for facilities related to specific routing conditions requested by the user ofthe call . Arrangements for facilities related to pro
19、tection mechanisms requested by the user of a call . Arrangements for facilities to convey user data in addition to the normal data flow in the data transfer phase . Arrangements for other facilities Arrangements for internal network utilities Recommendation X.320 (10/96) 1 1 2 2 2 3 3 4 4 4 4 4 4 5
20、 5 5 5 5 5 6 6 6 6 6 6 6 7 7 7 7 7 7 7 7 8 8 8 STD-ITU-T RECMN X.320-ENGL L77L H 48b257L Ob2772b lb7 = Page 7.4 Interworking between ISDNs where a packet switched bearer is used on one. and a circuit switched bearer% used on the other . 7.4.1 Interworking by call-control mapping 7.4.2 Interworking b
21、y port access Interworking between ISDNs. where a packet switched bearer is used on one ISDN. and a fiame relaying bearer is used on the other 7.5.1 Interworking by call-control mapping i . 7.5.2 interworking by port access Interworking between ISDNs. where a circuit switched bearer is used on one I
22、SDN. and a frame relaying bearer is used on the other 7.6.1 Interworking by call-control mapping 7.6.2 Interworking by port access 7.5 7.6 8 8 9 10 10 10 11 11 12 Recommendation X.320 (10/96) . 111 STD-ITU-T RECMN X-320-ENGL 177b id62571 0627727 OT3 SUMMARY This Recommendation defines general arrang
23、ements for the interworking between ISDNs for the provision 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 Th
24、is Recommendation is one of a set of Recommendations produced to facilitate considerations of intenvorking between networks. It is based on Recommendation X.300 which defines the general principles for intenvorking between public networks, and between public networks and other networks for the provi
25、sion of data transmission services. Recommendation X.300 indicates in particular how collections of physical equipment can be represented as “subnetworks” for consideration in intenvorking situations. This Recommendation describes the interworking arrangements between ISDNs for the provision of data
26、 transmission services. iv Recommendation X.320 (1 0/96) STDeITU-T RECMN X.320-ENGL L77b LiAb2571 Ob27728 T3T Recommendation X.320 GENERAL ARRANGEMENTS FOR INTERWORKING BETWEEN INTEGRATED SERVICES DIGITAL NETWORKS (ISDNs) FOR THE PROVISION OF DATA TRANSMISSION SERVICES (Melbourne, 1988; revised in 1
27、996) 1 Scope The purpose of this Recommendation is to describe the general arrangements for the interworking between ISDNs for the provision of data transmission services. These arrangements are applicable only to the interworking involving transmission capabilities, and not to interworking involvin
28、g 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 and other references
29、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 encouraged to invest
30、igate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITLJ-T Recommendation is regularly published. - - CCITT Recommendation E.164 (1991), Numberingplan for the ISDN era. ITU-T Recommendation E.166BC.122 (199
31、6), Numbering plan interworking for the E.164 and X.121 numbering plans. 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 - Sup
32、plementary services in ISDN. ITU-T Recommendation 1.500 (1993), General siructure of the ISDN interworking Recommendations. ITU-T Recommendation X.l (1996), International user classes of service in, and categories of access to, public daia networks and Integrated Services Digital Networks (ISDNs). I
33、TU-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. ITLJ-T Recommendation X.3 1 (1995),
34、 Support ofpacket mode terminal equipment by an ISDN. ITU-T Recommendation X.33 (1996), Access to packet switched data transmission services via frame relaying data transmission services. ITU-T Recommendation X.15 (1 996), Packet-switched signalling system between public networks providing daia tran
35、smksion services. ITU-T Recommendation X.76 (1 999, Network-to-network interface between public data networks providing the fiame relay data transmission service. ITU-T Recommendation X.121 (1996), International numberingplan for public data networks. - - - - - - - - - Recommendation X.320 (10/96) 1
36、 - ITU-T Recommendation X.300 (1996), Generalprinciples for interworking between public networks, and between public networks and other networks for the provision of data transmission services. ITU-T Recommendation X.301 (1996), Description of the general arrangements for call con b) communication c
37、apability; c) subnetwork functionality; d) data transmission service; e) interworking by call control; f) interworking by port access. This Recommendation makes use of the following terms defined in the 1.230-Series Recommendations: a) circuit switched bearer service; b) c) fiame relaying bearer ser
38、vice. packet switched virtual circuit bearer service; 4 Abbreviations For the purposes of this Recommendation, the following abbreviations apply: CNIC Clearing Network Identification Code CUG Closed User Group CUG/OA DTE Data Terminal Equipment ISDN Integrated Services Digital Network IWF Interworki
39、ng Function MSS Mobile Satellite System PSPDN SS No. 7 TA Terminal Adaptor TE Terminal Equipment TNIC Transit Network Identification Code Closed User Group with Outgoing Access Packet Switched Public Data Network Signalling System No. 7 5 Conventions No particular conventions are used. 2 Recommendat
40、ion X.320 (10/96) 6 General aspects This Recommendation, in describing interworking arrangements between two subnetworks for the provision of data transmission services, adheres to the general principles of Recommendation X.300. The environments of these two subnetworks are described in the followin
41、g subclauses. See also Table 1. Data transmission servicemearer service Supplementary services Categories of access TABLE 1K.320 General characteristics of ISDN X.l, 1.230-Series Circuit-Mode 1.25O-Series, Packet-Mode X.301 Frame-Mode X.36 X.l categories S, T, U See also 5.1 ISDN I General character
42、istic I Access via other networks PSTN CSPDN PSPDN FRPDN MSS ISDN 1.530 Recommendations X.321 and X.l category B Recommendations X.325 and X.l categories C, D X.328 X.324 SS No.7, X.75, X.76 X.l category Y, this Recommendation 6.1 ISDN The ISDN may provide packet switched and/or circuit switched and
43、/or fiame relay data transmission serviceshearer services as defined in Recommendations X.l, 1.230-Senes, and X.2. NOTE 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 switch
44、ed data transmission serviceshearer services. Supplementary services for the frame relaying operation on ISDN are for further study. For the provision of data transmission services, the ISDN may be accessed by DTEslTEs by the categories of access S, T, U as defmed in Recommendation X.l and/or the ac
45、cess methods defined in the 1.230-Series Recommenda- tions. In addition the ISDN may also be accessed via other networks, i.e. PSTN (see Recommendation I.530), CSPDN (see Recommendation X.l, category B and Recommendation X.321), PSPDN (see Recommendations X.325 and X.l, Categories C, D), MSS (see Re
46、commendation X.324), or ISDN (SS No. 7, Recommendations X.75 and X.76, see Recommendation X.l, category Y and this Recommendation). NOTE 2 - In the context of this Recommendation, and for the purpose of provision of data transmission services only, the following categories of bearer services defined
47、 in the 1.230-Series Recommendations are considered. (Others are for further study.): a) b) c) d) e) frame relaying bearer service. circuit-mode 64 kbit/s unrestricted, 8 kHz structured; circuit-mode 64 kbitk, 8 kHz structured, usable for speech information transfer; circuit-mode 64 kbits, 8 kHz str
48、uctured, usable for 3.1 kHz audio information transfer; virtual call and permanent virtual circuit; Recommendation X.320 (10/96) 3 STD.ITU.-T RECMN X-320-ENGL L79b ei 4862593 Ob27731 524 m 6.2 Call control between ISDNs The general arrangements for call control between ISDNs are as defined in Recomm
49、endation X.301. Network utilities used between the PSPDN and ISDN are as defined in Recommendation X.302 (not visible for users). Supplementary servicedoptional user facilities for the circuit-mode operation on ISDNs are as defined in the 1.250-Series Recommendations. NOTE - Supplementary services for the frame relaying operation on ISDN are for further study. 6.3 Functionalities of the ISDN The functionalities of different types of subnetworks are described in Recommendation X.305. In the case where two ISDNs are used to provide different data transmission serviceshearer servic
