1、INTERNATIONAL TELECOMMUNICATION UN ION ITU=T TELECOMMUNICATION STAN DARD I ZATI O N SECTOR OF ITU X.125 (09/98) SERIES X: DATA NETWORKS AND OPEN SYSTEM COM M U N I CATI ON S Public data networks - Network aspects Procedure for the notification of the assignment of i n t e rn a t i o n a I network i
2、dent if i ca t i o n codes for public frame relay data networks and ATM networks numbered under the E.164 numbering plan ITU-T Recommendation X. 125 (Previously CCITT Recommendation) ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS PUBLIC DATA NETWORKS X. I-X. 19 Services
3、and facilities In terfaces X.20-X.49 Transmission, signalling and switching X.50-X.89 Network asp Maintenance Administrative arrangements X. 150-X. 179 X. 1 80-X. 199 OPEN SYSTEMS INTERCONNECTION Model and notation Service definitions Connection-mode protocol specifications Connectionless-mode proto
4、col specifications PICS proformas Protocol Identification Security Protocols Layer Managed Objects Conformance testing General Satellite data transmission systems MESSAGE HANDLING SYSTEMS DIRECTORY 3SI NETWORKING AND SYSTEM ASPECTS INTERWORKING BETWEEN NETWORKS Networking Efficiency Quality of servi
5、ce Naming, Addressing and Registration Abstract Syntax Notation One (ASN. 1) IS1 MANAGEMENT Systems Management framework and architecture Management Communication Service and Protocol Structure of Management Information Management functions and ODMA functions ECURITY )SI APPLICATIONS Commitment, Con
6、currency and Recovery Transaction processing Remote operations )PEN DISTRIBUTED PROCESSING X .200-X . 209 X.2 10-X.2 19 X.220-X.229 X.230-X.239 X .240-X . 25 9 X.260-X.269 X.270-X.279 X.280-X.289 X.290-X.299 X.300-X.349 X .3 50-X . 399 X.400-X.499 X.500-X.599 X.600-X.629 X.630-X.639 X.640-X.649 X.65
7、0-X.679 X.680-X.699 X.700-X.709 X. 7 1 0-X. 7-1 9 X .7 20-X. 729 X.730-X.799 X.800-X.849 X.850-X.859 X.860-X.879 X.880-X.899 X.900-X.999 For further derails, please refer to ITU-T List of Recommendations. STD*ITU-T RECMN X.125-ENGL 1998 Y862591 Ob5b5b4 TLb ITU-T RECOMMENDATION X.125 PROCEDURE FOR TH
8、E NOTIFICATION OF THE ASSIGNMENT OF INTERNATIONAL NETWORK IDENTIFICATION CODES FOR PUBLIC FRAME RELAY DATA NETWORKS AND ATM NETWORKS NUMBERED UNDER THE E.164 NUMBERING PLAN Summary This Recommendation describes the need to allocate network identifiers (known as Intemational Network Identification Co
9、des) for Public Frame Relay Data Networks and ATM Networks numbered under the E.164 numbering plan. The structure of the code is defined. The procedure for the notification to the Telecommunication Standardization Bureau (TSB) of ITU of the assignment of any such International Network Identification
10、 Codes for Public Frame Relay Data Networks and ATM Networks numbered under the E.164 numbering plan is also specified. These Network Identification Codes may also be used in Operation and Maintenance procedures for ATM Networks which may be defined for example in Recommendation 1.610. Source ITU-T
11、Recommendation X. 125 was prepared by ITU-T Study Group 7 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 25th of September 1998. Recommendation X.125 (09/98) 1 STD=ITU-T RECMN X-125-ENGL 1978 m 4862571 065b565 952 9 FOREWORD ITU (International Telecommunication Union)
12、is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to
13、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 Recommendations on these topics. The approval of Recommendation
14、s by the Members of the ITU-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fail within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation the term recognized oper
15、ating agency (ROA) includes any individual, company, corporation or governmental organization that operates a public correspondence service. The terms Administration, ROA and public correspondence are defined in the Constitution of the ITU (Geneva, 1992). INTELLECTUAL PROPERTY RIGHTS The ITU draws a
16、ttention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by IT members or
17、 others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not
18、represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1999 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 permiss
19、ion in writing from the ITU. 11 Recommendation X.125 (09/98) - - - CONTENTS 1 Introduction 2 Scope 3 References 4 Definitions 5 Abbreviations . 6 Structure of the International Network Identification Code . 7 The Need for an Assignment and Notification Procedure 8 Procedure for the notification of t
20、he assignment of International Network Identification Codes Annex A - Notification by Administrations or National Authorities of the assignment of international Network Identification Codes for Public Frame Relay Data Networks and ATM Networks numbered under E . 164 Appendix I - Examples of the Use
21、of the International Network Identification Codes I . 1 1.2 1.3 Use within Frame Relay Signalling Protocols Use within ATM OAM procedures . Use within ATM signalling protocols . Page 1 1 2 2 2 2 3 3 . Recommendation X.125 (09/98) 111 _- STD-ITU-T RECMN X-125-ENGL 1998 I 4862591 065b5b7 725 = Recomme
22、ndation x.125 PROCEDURE FOR THE NOTIFICATION OF THE ASSIGNMENT OF INTERNATIONAL NETWORK IDENTIFICATION CODES FOR PUBLIC FRAME RELAY DATA NETWORKS AND ATM NETWORKS NUMBERED UNDER THE E.164 NUMBERING PLAN (Geneva, 1998) 1 Introduction Public Frame Relay Data Networks may be numbered under either the X
23、.121 numbering plan or under the E.164 numbering plan. The default numbering plan for ATM Networks is the E. 164 numbering plan. Intemational Network Identification Codes are required for use within the Frame Relay and ATM signalling protocols (as defined for example in Recommendations X.36 and X.76
24、) in order to support features such as transit network identification, transit network selection, closed user group interlock codes and clearing network identification. Public Frame Relay Data Networks numbered under the X.121 numbering plan are identified by use of the Data Network Identification C
25、odes (DNICs) associated with those networks. The procedure for the notification to the Telecommunication Standardization Bureau (TSB) of the allocation of DNICs by Administrations is described in Annex LK.121. Unlike the X.121 numbering plan, it is not mandatory that an E.164 number be structured to
26、 specifically identie a particular network within the domain of a particular country code. Most Administrations utilise an integrated national network numbering plan, in which cases the E.164 number structure does not identi6 a specific network (operator). Accordingly, the need to accommodate networ
27、k identification cannot be based solely on the structure of the E.164 numbers. To overcome this problem, a protocol specific mechanism has been defined within Recommendations X.36 and X.76 in order to uniquely identie a particular Public Frame Relay Data network which may be numbered under E. 164. W
28、hen used in conjunction with the E.164 Country Code, these network identifiers provide the ability to uniquely identi6 (on a global basis) a particular Public Frame Relay Data Network or ATM network. The network identifiers are contained within a specific field of the signalling protocol and do not
29、impact on the structure of E.164 numbers and require no modification to national E. 164 numbering plans. Network Identification Codes are also required for possible future Operation and Maintenance procedures which may be defined for example in Recommendation 1.610 and for possible future use by the
30、 ATM signalling protocols. Such network identifiers only have relevance within the specific Frame Relay and ATM signalling protocols or the ATM OAM protocols. 2 Scope This Recommendation describes the need to allocate International Network Identification Codes for Public Frame Relay Data Networks an
31、d ATM Networks which are numbered under the E.164 numbering plan. The structure of the codes are defined. The procedure for the notification to TSB of the assignment of any such network identifiers for Frame Relay Data Networks and ATM networks numbered under the E.164 numbering plan is also specifi
32、ed. These Network Identification Codes can also be used in Operation and Maintenance procedures which may be defined for example in Recommendation 1.61 O. Recommendation X.125 (09/98) 1 3 References This Recommendation is related to and is compatible with the following Recommendations. ITU-T Recomme
33、ndation E. 164 (1 997), The international public telecommunication numberingplan. CCITT Recommendation E. 165 (1988), Timetable for coordinated implementation of the full capability of the numbering plan for the ISDN era (Recommendation E. 164). ITU-T Recommendation E. 165.1 (1996), Use of Escape co
34、de “O“ within the E. 164 numberingplan during the transition period io implementation of NPI mechanism. ITU-T Recommendation E. 166K 122 ( 1998), Numbering plan interworking for the E. I64 and X 121 numbering plans. ITU-T Recommendation X. 12 1 (1996), International Numberingplan for public data net
35、works. ITU-T Recommendation X.36 (1995), Amd.1 (1996), Interface between Data Terminal Equipment (DTE) and Datu Circuit-terminating Equipment (DCE) for public data networks providing fiame relay data transmission service by a dedicated circuit - Amendment 1: Switched Virtual Circuit (SVC) signalling
36、 and refinements of Permanent Virtual Circuit (P VC) signalling. ITU-T Recommendation X.76 (1995), Amd. 1 (1997), Network-to-network interface between public datu networks providing the fiame relay data transmission service - Amendment I: Switched virtual circuits. CCITT Recommendation T.50 (1 992),
37、 International Reference Alphabet (IRA) (Formally international Alphabet No. 5 or AIS) - Information technology - 7 bit coded character set for information interchange. Definitions Within the public switched data network environment, the terms used for all networks and services must be compatible an
38、d consistent. Therefore this Recommendation relies on the terms and definitions defined in Recommendations E. 164, X.121,X.122,X.36andX.76. 5 Abbreviations This Recommendation uses the following abbreviations: ATM Asynchronous Transfer Mode ITU International Telecommunication Union OAM Operation and
39、 Maintenance TSB Telecommunication Standardization Bureau 6 Structure of the International Network Identification Code For ATM Networks and those Public Frame Relay Data Networks numbered under the E.164 numbering plan, the International Network Identification Code uniquely defines a specific networ
40、k. The International Network Identification Code shall consist of the E. 164 Country Code followed by a National Network Identifier. The maximum length of the Intemational Network Identification Code is 8 digits. Only numeric values (0-9) will be used. The structure of the International Network Iden
41、tification Code is shown in Figure 1. The maximum length of 8 digits has been imposed to take account of the use of these network identifiers in Operation and Maintenance procedures which may be defined in Recommendation 1.61 O. National Allocation Authorities should also be aware that the length of
42、 the E.164 Country Code could change in the future. The need to satisfy both these requirements in the future should be taken into account when allocating values for the National Network Identifier. It is suggested that National Network Identifier Codes should be allocated in a manner such that most
43、 significant digits are assigned the value “O“. 2 Recommendation X.125 (0998) STD-ITU-T RECMN X-125-ENGL L998 4862591 Clb5b5b9 5TB H 1 E.164 Country Code National Network Identifier (allocated by National Authority) International Network identification Code G b (Maximum 8 digits) T073086&98/dOl Figu
44、re UX.125 - Structure of the International Network Identification Code 7 The allocation and registration procedures for National Network Identifiers is seen to be a national matter, However, regular publication of such information is required to be made available to both users and operators of Publi
45、c Frame Relay Data Networks and ATM Networks for the effective operation of features such as transit network identification, transit network selection, closed user group, clearing network identification, intenvorking of Public Frame Relay Data Networks and Operation and Maintenance procedures. A pro
46、cedure for the notification to TSB of International Network Identifier Codes following the assignment by a National Authority of National Network Identifiers (see clause 8) has been defined in order that this information can be maintained in a central register and be published on a regular basis. TS
47、B will maintain a list of allocated International Network Identification Codes and regularly publish the information. NOTE - This process is similar to that currently in use for the notification and publication of assigned X.121 DNICs as defined in Recommendation X. 12 1. The Need for an Assignment
48、and Notification Procedure 8 Procedure for the notification of the assignment of International Network Identification Codes The assignment of National Network Identifiers to Public Frame Relay Data Networks and ATM Networks numbered under the E.164 numbering plan, in order to create an International
49、 Network Identification Code, is a purely national matter and will be made by an Administration or a National Authority in accordance with national laws and regulations or agreed national arrangements. The allocating Authority will noti TSB of any new or revised assignments. Assignments by Administrations or National Authorities of Intemational Network Identification Codes will be published in the ITU Operational Bulletin. A recapitulatory list of the International Network Identification Codes will be published annually in the Operational Bulletin. In order to keep this list up
