1、 STDmITU-T RECMN X-224 AND 1-ENGL 1777 W 48b2571 Ob43477 701 INTERNATIONAL TELECOMMUNICATION UN ION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU X.224 Amendment I (08/97) SERIES X: DATA NETWORKS AND OPEN SYSTEM COMMUN KATION Open System Interconnection - Connection-mode p rotoco I specifica
2、t ions Information technology - Open Systems Interconnection - Protocol for providing the connection-mode transport service Amendment I: Relaxation of class conformance requirements and expedited data service feature negotiation ITU-T Recommendation X.224 - Amendment I (Previously CCITT Recommendati
3、on) STD.ITU-T RECMN X.224 AND 1-ENGL L997 m 48b2591 Ob43498 848 W ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATION PUBLIC DATA NETWORKS Services and facilities Interfaces Transmission, signalling and switching Network aspects Maintenance Administrative arrangements OPEN SYS
4、TEM INTERCONNECTION Model and notation X.1-X.199 X. 1 -X. 19 X.20-X.49 X SO-X. 89 X.90-X. 149 X. 150-X. 179 X. 180-X. 199 X.200-X.299 X.200-X.209 Service definitions X.2 10-X.219 Connectionless-mode protocol specifications PICS proformas Protocol Identification Security Protocols Layer Managed Objec
5、ts Conformance testing INTERWORKING BETWEEN NETWORKS General Satellite data transmission systems MESSAGE HANDLING SYSTEMS DIRECTORY OS1 NETWORKING AND SYSTEM ASPECTS Network ng Efficiency Naming, Addressing and Registration Abstract Syntax Notation One (ASN. 1) OS1 MANAGEMENT Systems Management fram
6、ework and architecture Management Communication Service and Protocol Structure of Management Information Management functions SECURITY OS1 APPLICATIONS Commitment, Concurrency and Recovery Transaction processing Remote operations OPEN DISTRIBUTED PROCESSING X.230-X.239 X.240-X.259 X.260-X.269 X.270-
7、X.279 X.280-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.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 .8 80-X . 899 X.900-X.999 Forjrrther de
8、tails, please refer to ITU-T List of Recommendations. STD-ITU-T RECNN X-224 AND 1-ENGL 2777 M 48b257L Ob43477 784 INTERNATIONAL STANDARD 8073 ITU-T RECOMMENDATION X.224 INFORMATION TECHNOLOGY - OPEN SYSTEMS INTERCONNECTION - PROTOCOL FOR PROVIDING THE CONNECTION-MODE TRANSPORT SERVICE AMENDMENT 1 Re
9、laxation of class conformance requirements and expedited data service feature negotiation Summary This Amendment introduces optionai enhancements to the protocol for providing the connection-mode Transport Service (see ITU-T Rec. X.224 1 ISO/IEC 8073), to take into account the requirements of OS1 us
10、ers who do not have a need for full implementation. This Amendment permits relaxation of the strict conformance requirements to allow an implementation which will never need to support expedited data, or need to operate over connection-mode network service, to still be conformant without necessarily
11、 implementing either or both of these facilities. Source The ITU-T Recommendation X.224, Amendment 1 was approved on the 9th of August 1997. The identical text is also published as ISO/IEC International Standard 8073. ITU-T Rec. X.224 (1995)/Amd.l(1997 E) 1 FOREWORD ITU (International Telecommunicat
12、ion Union) 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
13、 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 Recommendations on these topics. The approval of Rec
14、ommendations 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 fall within IT-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expressio
15、n “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intell
16、ectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, the ITU had not
17、 received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database. O ITU 1998 All rights r
18、eserved. 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 ITU. 11 ITU-T Rec. X.224 (1995)/Amd.l (1997 E) STD*ITU-T RECMN X.22Li AMD 1-ENGL 1997 B 48b259L Ub43
19、501 162 = CONTENTS Introduction . Clause 8 Subclause 12.2.3.2 . Subclause 14.2 . Subclause 14.3 Subclause 14.4 . Subclause C.6.2 . Subclause C.9.2 Subclause C.9.3 . . Subclause C.9.4 Subclause C.9.5 Subclause C.10 . ITU-T Rec . X.224 (1995)/Amd.l(1997 E) Page 1 1 1 1 1 2 2 2 2 2 2 2 . 111 ISO/IEC SO
20、73 : 1997/Amd.l : 1998 (E) INTERNATIONAL STANDARD ITU-T RECOMMENDATION INFORMATION TECHNOLOGY - OPEN SYSTEMS INTERCONNECTION - PROTOCOL FOR PROVIDING THE CONNECTION-MODE TRANSPORT SERVICE AMENDMENT 1 Relaxation of class conformance requirements and expedited data service feature negotiation Introduc
21、tion This Amendment introduces optional enhancements, to take into account the requirements of potential OS1 users who do not have a need for full implementation, by permitting relaxation of the strict conformance requirements to allow implementations which will never need to support expedited data,
22、 or never need to operate over CONS, to still be conformant to IT-T Rec. X.224 I ISO/IEC 8073 without necessarily implementing either or both of these facilities. 1) Clause 8 In Table 6, in the row ofcells starting with Expedited data transfer, replace m and x by o: 2) Subclause 12.2.3.2 Replace the
23、 existing text ofitem b) with: b) expedited data, if option is selected (see 6.1 1); 3) Subclause 14.2 Replace the existing text with: 14.2 The system shall implement either: a) I) 2) for conformance to IT-T Rec. X.224: Class O; or for conformance to ISO/IEC 8073: Class O, or Class 2, or both. Each
24、of these implies operation over CONS. or: b) Class 4 over CLNS. or: c) Both a) and b). NOTE - Case C) provides full intenvorking possibility with other transport implementations. Cases a) and b) are restricted to operation in their respective network layer environments. Care should therefore be take
25、n when choosing to implement only a) orb). 4) Subclause 14.3 Replace existing text with: 14.3 If the system implements class 3, or class 4 operating over CONS, it shall also implement class 2. ITU-T Rec. X.224 (1995)/Amd.l (1997 E) 1 ISO/IEC 8073 : 1997/Amd.l : 1998 (E) 5) Subclause 14.4 In Table 9,
26、 in the row of cells starting with Expedited data transfer, replace mandatory with optional. TIF1 1 6) Subclause C.6.2 In the row for Index C4L, Status column, replace ISO:C2:0 with IS0:O.l andreplace CCT:N/A with CCT:O. Expedited data transfer when operating over CONS (Network normal) 6.11.1 0 Yes
27、No 7) Subclause (2.9.2 Replace the row for Index TlF11 with: T2F12 Yes No Expedited data transfer when operating over CONS (Network normal) 6.1 1.1 0 8) Subclause C.9.3 Replace the row for Index T2F12 with: T3F11 Yes No Expedited data transfer when operating over CONS (Network normal) 6.11.1 0 9) Su
28、bclause C.9.4 Replace the row for Index T3F 1 1 with: T4F34 Yes No Expedited data transfer (Network normal) 6.1 1.1, 0 6.1 1.2 10) Subclause C.9.5 Delete row for Index T4F 1 8. Delete row for Index T4F26. Insert new row before Index T4F28. 11) Subclause C.10 In the rows for Index ST1 1, ST12, ST15 a
29、nd ST16, under the Status column, in each, replace C1 OR C2 OR C3 OR C4 OR C4L:M by TlF11 OR T2F12 OR T3F11 OR T4F34:M. 2 ITU-T Rec. X.224 (1995)lAmd.l (1997 E) STD-ITU-T RECMN Xm22LI AMD 1-ENGL 1997 ID 48b2.591 06113503 T35 Series A Series B Series C Series D Series E Series F Series G Series H Ser
30、ies I Series J Series K Series L Series M Series N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statisti
31、cs General tariff principles Overall network operation, telephone service, service operation and human factors Non-telephone telecommunication services Transmission systems and media, digital systems and networks Audiovisual and multimedia systems Integrated services digital network Transmission of
32、television, sound programme and other multimedia signals Protection against interference Construction, installation and protection of cables and other elements of outside plant TMN and network maintenance: international transmission systems, telephone circuits, telegraphy, facsimile and leased circu
33、its Maintenance: international sound programme and television transmission circuits Specifications of measuring equipment Telephone transmission quality, telephone installations, local line networks Switching and signalling Telegraph transmission Telegraph services terminal equipment Terminals for telematic services Telegraph switching Data communication over the telephone network Data networks and open system communication Programming languages
