1、STD.ITU-T RECMN Xmb30-ENGL 1998 486259L Ob55775 776 .I INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STAN DARD IZATI ON SECTOR OF ITU X.630 (09/98) SERIES X: DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS OS1 networking and system aspects - Efficiency Efficient open systems interconnec
2、tion (OSI) operations ITU-T Recommendation X.630 (Previously CCITT Recommendation) ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS PUBLIC DATA NETWORKS Services and facilities Interfaces Transmission, signalling and switching Network aspects Maintenance Administrative arr
3、angements OPEN SYSTEMS ZNTERCONNECTION Model and notation Service definitions Connection-mode protocol specifications Connectionless-mode protocol specifications PICS proformas Protocol Identification Security Protocols Layer Managed Objects Conformance testing General Satellite data transmission sy
4、stems MESSAGE HANDLING SYSTEMS DIRECTORY OS1 NETWORKING AND SYSTEM ASPECTS INTERWORKING BETWEEN NETWORKS Networking 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.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 x.300-x.3
5、49 X.350-X.399 x.400-x.499 x.500-x.599 X.600-X.629 Quality of service Naming, Addressing and Registration Abstract Syntax Notation One (ASN. i) Systems Management framework and architecture Management Communication Service and Protocol Structure of Management Information Management functions and ODM
6、A functions OS1 MANAGEMENT SECURITY OS1 APPLICATIONS Commitment, Concurrency and Recovery Transaction processing Remote operations OPEN DISTRIBUTED PROCESSING X.640-X.649 X.650-X.679 X.680-X.699 X.700-X.709 X.710-X.719 X.720-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.9
7、99 or urter details, please reer to ITU-TList o Recommendations. ITU-T RECOMMENDATION X.630 EFFICIENT OPEN SYSTEMS INTERCONNECTION (OSI) OPERATIONS Summary This Recommendation provides the overview of the efficient protocol operations at the various layers identified by the reference model for open
8、systems interconnection specified in Recommendation X.200. Source IT-T Recommendation X.630 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.630 (09/98) i FOREWORD ITU (International Telecommuni
9、cation Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The IT Telecommunication Standardization Sector (IT-T) is a permanent organ of the IT. The IT-T is responsible for studying technical, operating and tariff questions and issuing Recommendations on them with
10、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 Reco
11、mmendations 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 ITU-Ts purview, the necessary standards are prepared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expressio
12、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
13、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
14、 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 1999 All rights r
15、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 Recommendation X.630 (09/98) CONTENTS 1 Scope 2 Normative references 2.1 Identical Recommenda
16、tions I International Standards 2.2 2.3 Additional references Paired Recommendations I International Standards equivalent in technical content 3 Definitions 3.1 Reference model definitions . Basic Reference Model definitions . 3.1.1 3.1.2 Naming and addressing definitions . 3.2 Service conventions d
17、efmitions 3.3 Presentation definitions . 3.4 Session definitions 3.5 Application Layer Structure definitions 3.6 ACSE service definitions 3.7 Taxonomy of profile definitions . 3.8 Minimal OS1 facilities definitions . 4 Abbreviations . 5 Efficient OS1 protocol operations . 5.1 Backgroundmotivation fo
18、r studies of efficient OS1 protocol operations . 5.2 5.3 Efficient upper layer protocol operations . 6.1 Introduction . 6.2 Functions provided by the OS1 upper layers . 6.3 Efficiency concerns regarding current OS1 upper layer protocol 6.4 Efficient upper layer protocol options . 6.4.1 Connection-mo
19、de protocols 6.4.2 Connectionless-mode upper layer protocols . 6.5 Matching efficiency needs to vanous upper layer protocol options . Efficient lower layer protocol operations . 7.1 Introduction . 7.2 Functions provided by the OS1 Lower Layers 7.2.1 Data Link Layer 7.2.2 Network Layer . 7.2.3 Transp
20、ort Layer . Requirements and principles governing efficient OS1 protocol operations Interworking requirements for efficient OS1 protocol operations . 6 7 7.3 Lower layer protocol options 7.3.1 Data Link Efficiency Option . 7.3.2 Fast byte for the Network and Transport layers 7.3.3 Efficient use of t
21、he connectionless mode Matching efficiency needs to various lower layer protocol options . 7.4.1 Single subnetworks . 7.4 7.4.2 Multiple subnetworks Integration of efficiency options across the layers . Possible combinations of upper and lower layer efficiency options . 8.2 Relaying issues 8 8.1 Rec
22、ommendation X.630 (0998) Page 1 1 1 3 4 4 4 4 4 5 5 5 6 6 6 6 6 7 7 9 10 11 11 11 12 13 13 20 21 22 22 22 22 22 22 23 23 23 23 25 25 25 26 26 26 . 111 Recommendation X.630 EFFICIENT OPEN SYSTEMS INTERCONNECTION (OSI) OPERATIONS Geneva, 1998) 1 Scope This Recommendation provides an overview of effici
23、ent protocol operations at the various layers identified by the Reference Model for Open Systems Interconnection specified in ITU-T Rec. X.200 I ISOAEC 7498-1. It provides an overview to the set of Recommendations and International Standards that have been produced to facilitate the interconnection
24、of information processing systems in an open environment where efficiency of communications is paramount. Such efficiencies include: a) reduction in the overhead needed to encode control information for use in bandwidth-limited environments (such as radio links) or processing-limited systems (such a
25、s switching systems); b) reduction in the delay to set up the association between the communicating applications so that data transfer can begin expeditiously; and c) reduction in the support of unneeded functionality in certain environments where the communications requirements of the applications
26、are limited. This Recommendation should be useful to designers of OS1 applications and implementors of OS1 protocols for a variety of purposes which include serving as a refinement of the understanding of OSI, and extending the usefulness and applicability of these efficient OS1 protocols to other a
27、pplication domains (e.g., real-time, and/or low bandwidth andor long-delay environments). 2 Normative references The following ITU-T Recommendations and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication
28、, the editions indicated were valid. Ail 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
29、currently valid ITU-T Recommendations is regularly published. 2.1 Identical Recommendations I International Standards - ITU-T Recommendation X.200 (1994) I ISOLEC 7498-1: 1994, Information technology - Open Systems Interconnection - Basic reference model: The basic model. - ITU-T Recommendation X.20
30、7 (1993) I ISOAEC 9545:1994, Information technology - Open Systems Interconnection - Application layer structure. - ITU-T Recommendation X.2 1 O (1 993) I ISOLEC 1073 1 : 1994, Information technology -Open Systems Interconnection - Basic Reference Model: Conventions for the definition of OSI service
31、s. - ITU-T Recommendation X.212 (1995) 1 ISOAEC 8886:1996, Information technology - Open Systems Interconnection - Data link service dejnition. - ITU-T Recommendation X.213 (1995) I ISOAEC 8348: Interconnection - Network service definition. - ITU-T Recommendation X.214 (1995) I ISOAEC 8072: Intercon
32、nection - Transport service dejinition. 996, Information technology - Open Systems 996, Information technology - Open Systems Recommendation X.630 (09/98) 1 STD-ITU-T RECMN Xeb30-ENGL 1998 9 48b2591 Ob55781 T7T ITU-T Recommendation X.215 (1995) I ISOAEC 8326:1996, Information technology - Open Syste
33、ms Interconnection - Session service definition. ITU-T Recommendation X.215 (1995)/Amd.l (1997) I ISOIIEC 8326:1996/Amd.1:1998, Information technology - Open Systems Interconnection - Session service definition - Amendment 1: Eficiency enhancements. ITU-T Recommendation X.215 (1995)/Amd.2 (1997) 1 I
34、SOAEC 8326: 1996/Amd.2: 1998, Information technology - Open Systems Interconnection - Session service definition - Amendment 2: Nested connections functional unit. ITU-T Recommendation X.216 (1994) 1 ISOiEC 8822: 1994, Information technology - Open Systems Interconnection - Presentation service defi
35、nition. ITU-T Recommendation X.216 (1994)/Amd. 1 (1997) I ISOAEC 8822:1994/Amd. 1:1998, Information technology - Open Systems Interconnection - Presentation service de$nition - Amendment i: Eficiency enhancements. ITU-T Recommendation X.216 (1994)/Amd.2 (1997) I ISOIIEC 8822:1994/Amd.2:1998, Informa
36、tion technology - Open Systems Interconnection - Presentation service definition - Amendment 2: Nested connections functional unit. ITU-T Recommendation X.217 (1995) I ISOAEC 8649:1996, Information technology - Open Systems Interconnection - Service definition for the association control service ele
37、ment. IT-T Recommendation X.217 (1995)/Amd.2 (1997) I ISO/IEC 8649:1996/Amd.2:1998, Information technology - Open Systems Interconnection - Service definition for the association control service element - Amendment 2: Fast-associate mechanism. IT-T Recommendation X.225 (1995) I ISOAEC 8327-1: 1996,
38、Information technology - Open Systems Interconnection - Connection-oriented session protocol: Protocol specijication. ITU-T Recommendation X.225 (1995yAmd. 1 (1997) I ISOAEC 8327-1: 1996/Amd. 1: 1997, Information technology - Open Systems Interconnection - Connection-oriented session protocol: Proto
39、col specification - Amendment 1: Eficiency enhancements. IT-T Recommendation X.225 (1995)/Amd.2 (1997) I ISOAEC 8327-1:1996/Amd.2: 1998, Information technology - Open Systems Interconnection - Connection-oriented session protocol: Protocol specification - Amendment 2: Nested connectionsfunctional un
40、it. ITU-T Recommendation X.226 (1994) I ISOAEC 8823-1: 1994, Information technology - Open Systems Interconnection - Connection-oriented presentation protocol: Protocol specification. ITU-T Recommendation X.226 (1 994)/Amd. 1 (1 997) I ISOAEC 8823- 1 : 1994/Amd. 1 : 1997, Information technology - Op
41、en Systems Interconnection - Connection-oriented presentation protoco I: Protocol specijcation - Amendment 1: EfJiciency enhancements. ITU-T Recommendation X.226 (1994yAmd.2 (1997) I ISOAEC 8823-1 :1994/Amd.2: 1998, Information technology - Open Systems Interconnection - Connection-oriented presenta
42、tion protocol: Protocol speciJication - Amendment 2: Nested connectionsfunctional unit. IT-T Recommendation X.227 (1995) I ISOAEC 8650-1 :1996, Information technology - Open Systems Interconnection - Connection-oriented protocol for the association control service element: Protocol specif cation. IT
43、U-T Recommendation X.227 (1995)/Amd.2 (1997) I ISOIIEC 8650-1:1996/Amd.2: 1998, Information technology - Open Systems Interconnection - Connection-oriented protocol for the association control service element: Protocol speci$cation - Amendment 2: Fast-associate mechanisms. ITU-T Recommendation X.233
44、 (1997) I ISOAEC 8473-1: 1998, Informution technology - Protocol for providing the connectionless-mode network service: Protocol speccation. IT-T Recommendation X.234 (1994) I ISO/IEC 8602:1995, Information technology - Protocol for providing the OSI connectionless-mode transport service. ITU-T Reco
45、mmendation X.235 (1995) I ISOAEC 9548-1: 1996, Information technology - Open Systems Interconnection - Connectionless Session protocol: Protocol speczjcation. ITU-T Recommendation X.236 (1995) I ISOAEC 9576-1 : 1995, Information technology - Open Systems Interconnection - Connectionless presentation
46、 protocol: Protocol specification. 2 Recommendation X630 (09/98) - ITU-T Recommendation X.237 (1995) I ISOIEC 10035-1:1995, Information technology - Open Systems Interconnection - Connectionless protocol for the association control service element: Protocol specification. - ITU-T Recommendation X.63
47、3 (1996) I ISOAEC 14700:1996, Information technology - Open Systems Interconnection - Network fast byte protocol. - ITU-T Recommendation X.634 (1996) I ISO/IEC 14699:1997, Information technology - Open Systems Interconnection - Transport fast byte protocol. - ITU-T Recommendation X.650 (1996) I ISOD
48、EC 7498-3:1997, Information technology - Open Systems Interconnection - Basic reference model: Naming and addressing. - ITU-T Recommendation X.680 (1997) I ISOAEC 8824-1:1998, Information technology -Abstract Syntax Notation One (ASN, 1): SpeciJcation of basic notation. - ITU-T Recommendation X.681
49、(1997) I ISOAEC 8824-2:1998, Information technology -Abstract Syntax Notation One (ASN. 1): Information object specification. - ITU-T Recommendation X.682 (1997) I ISO/IEC 8824-3:1998, Information technology - Abstract Syntax Notation One (ASN. I): Constraint specification. - ITU-T Recommendation X.683 (1997) I ISOIEC 8824-4:1998, Information technology -Abstract Syntax Notation One (ASN.1): Parameterization of ASN. 1 specifications. - ITU-T Recommendation X.690 (1997) I ISOAEC 8825-1 : 1998, Information technology - ASN. I encoding rules: Specifcation of Basic Encoding Rule
