1、STD-ITU-T RECMN X-2Lb AMD 2-ENGL 1997 m 48b259L 0650849 TO9 m INTERNATIONAL TELECOMMUNICATION UN ION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU X.216 Amendment 2 (1 2/97) SERIES X: DATA NETWORKS AND OPEN SYSTEM CO M M U N I CAT I O N Open System Interconnection - Service definitions infor
2、mation technology - Open Systems interconnection - Presentation service definition Amendment 2: Nested connections functional unit ITU-T Recommendation X.216 - Amendment 2 (Previously CCITT Recommendation) STDmITU-T RECMN X.21b AND 2-ENGL 1993 4862593 Ob50850 720 W ITU-T X-SERIES RECOMMENDATIONS DAT
3、A NETWORKS AND OPEN SYSTEM COMMUNICATION UBLIC DATA NETWORKS Services and facilities Interfaces Transmission, signalling and switching Network aspects Maintenance Administrative arrangements )PEN SYSTEM INTERCONNECTION Model and notation Connection-mode protocol specifications Connectionless-mode pr
4、otocol specifications PICS profomas Protocol Identification Security Protocols Layer Managed Objects Conformance testing INTERWORKING BETWEEN NETWORKS General Satellite data transmission systems MESSAGE HANDLING SYSTEMS DIRECTORY OS1 NETWORKING AND SYSTEM ASPECTS Networking Efficiency Quality of ser
5、vice Naming, Addressing and Registration Abstract Syntax Notation One (ASN. I) OS1 MANAGEMENT Systems Management framework and architecture Management Communication Service and Protocol Structure of Management Information Management functions and ODMA functions SECURITY OS1 APPLICATIONS Commitment,
6、Concurrency and Recovery Transaction processing Remote operations OPEN DISTRIBUTED PROCESSING 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.349 X.350-X.399 X.400-
7、X.499 X.500-X.599 X .600-X . 629 X.630-X.639 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.999 Forhrther details, please refer to ITU-T List of Recommendations. INTERNATIONAL STANDARD 8822 ITU-T RECOMME
8、NDATION X.216 INFORMATION TECHNOLOGY - OPEN SYSTEMS INTERCONNECTION - PRESENTATION SERVICE DEFINITION AMENDMENT 2 Nested connections functional unit Summary The Presentation service definition defined in ITU-T Rec. X.216 I ISOAEC 8822 is enhanced to define an optional functional unit which permits a
9、dditional, independent, nested presentation connections within an existing presentation connection. This enhancement will support the reusability of existing application layer standards (each making full, and possibly incompatible, use of the presentation synchronization services) as components of n
10、ew application layer standards. Source The IW-T Recommendation X.216, Amendment 2 was approved on the 12th of December 1997. The identical text is also published as ISOIEC International Standard 8822, Amendment 2. ITU-T Rec. X.216 (1994)/Amd. 2 (1997 E) 1 STDmITU-T RECMN X.21b AND 2-ENGL 1997 m 4862
11、591 Ob50852 5T3 m FOREWORD ITU (International Telecommunication 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 a
12、nd tariff questions and issuing Recommendations on them with 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,
13、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 Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis
14、 with IS0 and IEC. NOTE In this Recommendation, the expression “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 o
15、f 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 ITU members or others outside of the Recommendation development process. As of
16、 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 represent the latest information and are therefore strongly urge
17、d to consult the TSB patent database. O ITU 1998 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 ITU. 11 ITU-T Rec. X.216 (1994)IAmd. 2 (
18、1997 E) STDmITU-T RECMN X-2Lb AND 2-ENGL 1997 VBb259L Ob50853 V3T CONTENTS Subclause 2.1 . New subclause 3.4.20 . New subclause 6.2.7 . Subclause 6.3 . Subclause 7.1 . Subclause 8.2 . Clause 10 Subclause 10.2 . Subclause 10.2.1 Subclauses 10.2.1 . 1 through 10.2.1.3 . Clause 1 1 ITU-T Rec . X.216 (1
19、994)lAmd . 2 (1997 E) Page 1 1 1 1 2 2 2 2 2 2 2 . 111 - STD-ITU-T RECMN X=2Lb AND 2-ENGL 1997 48b2591 Ob5085Y 376 ISO/IEC 8822 : 1994/Amd.2 : 1998 (E) INTERNATIONAL STANDARD ITU-T RECOMMENDATION INFORMATION TECHNOLOGY - OPEN SYSTEMS INTERCONNECTION - PRESENTATION SERVICE DEFINITION AMENDMENT 2 Nest
20、ed connections functional unit 1) Subclause 2.1 Add the following reference in numerical order: - ITU-T Recommendation X.215 (1995)/Amd.2 (1997) I ISOAEC 8326:1996/Amd.2:1988, Information technology - pen Systems Interconnection - Session service definition - Amendment 2: Nested connectionsfirnciion
21、al unit. 2) New subclause 3.4.20 Add a new subclause 3.4.20 as follows: 3.4.20 presentation connection. nested presentation connection: A presentation connection which is logically embedded within an existing 3) New subclause 6.2.7 Add a new subclause 6.2.7 as follows: 6.2.7 An application entity sp
22、ecification requiring a presentation connection may require the establishment of a new presentation connection end-point for a new presentation connection, or may require the establishment of a nested presentation connection end-point within the connection end-point for an existing (outer-level or n
23、ested) presentation connection. The issuing of a P-CONNECT request at a nested presentation connection end-point establishes a nested presentation connection. Nested presentation connections are entirely independent in relation to services provided directly by the presentation layer, but have some d
24、ependencies (specified in ITU-T Rec. X.215 1 ISO/IEC 8326) in relation to services passed through from the session layer. Nested presentation connections can only be established if the immediately enclosing presentation connection has agreed the use of the nested connections functional unit. 4) Subc
25、lause 6.3 Add a new paragraph at the end of this subclause: There is a one-to-one correspondence between presentation connection end-points and session connection end-points, and the nesting structure (if any) within an outer-level session connection end-point is identical to the nesting structure w
26、ithin the corresponding presentation connection end-point. ITU-T Rec. X.216 (1994)/Amd. 2 (1997 E) 1 - STD-ITU-T RECMN X*23b AMD Z-ENGL 3997 4862593 Ob50855 202 ISOfiEC 8822 : 1994/Amd.2 : 1998 (E) 5) Subclause 7.1 Add a new paragraph at the end of this subclause as follows: This service may be invo
27、ked at an outer-level presentation connection end-point to establish a new outer-level presentation connection, or may be invoked at a nested presentation connection end-point to establish a nested presentation connection. 6) Subclause 8.2 In this subclause in both the introductory sentence of item
28、a), and in the sentence after the list, add and IT-T Rec. X.21YAmd.2 1 ISOflEC 8326/Amd.2, after reference to ITU-T Rec. X.215 1 ISOflEC 8326. Add at the end of the list in a) a new item: - the nested connection functional unit. 7) Clause 10 Change Table 2 by adding User Summary at the end of the li
29、st of parameters for P-CONNECT request, P-CONNECT indication and P-CONNECT responsekonfirrn. 8) Subclause 10.2 Add to the end of the first sentence of this subclause: . or to establish a nested presentation connection between them. 9) Subclause 10.2.1 Change Table 3 to replace all M entries with C e
30、ntries for the Calling-presentation-address, Called-presentation-address, and Responding-presentation-address. 10) Subclauses 10.2.1.1 through 10.2.1.3 Add a new secondparagraph to 10.2.1.1 through 10.2.1.3 asfollows: This parameter shall be present when an outer-level presentation connection is bei
31、ng established, and shall be absent when a nested presentation connection is being established. 11) Clause 11 Add new items c) and d) to the thirdparagraph of this clause: c) d) Services invoked on any presentation connection within the same outer-level connection are sequenced with respect to each
32、other and with respect to services on that outer-level connection. Services on presentation connections within a nested set do not disrupt services on other presentation connections within the set, except that services on a nested presentation connection may by disrupted by any of the services liste
33、d in 1 1 S.4 which are invoked on any of the enclosing presentation connections. ITU-T Rec. X.216 (1994)Amd. 2 (1997 E) STD=ITU-T RECMN X.216 AMD 2-ENGL 1997 48b2591 Ob50856 LU9 eries A ieries B ;cries C ienes D ieries E Series F Series G Series H Series I Series 1 Series K Series L Series M Series
34、N Series O Series P Series Q Series R Series S Series T Series U Series V Series X Series Y Series Z ITU-T RECOMMENDATIONS SERIES Organization of the work of the ITU-T Means of expression: definitions, symbols, classification General telecommunication statistics General tariff principles Overall net
35、work 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 television, sound programme and other mu
36、ltimedia 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 circuits Maintenance: international sound pro
37、gramme 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 Global information infiastructure Programming languages Printed in Switzerland Geneva, 1998
