1、 ITU-T RECMN*X*23b 95 m 4862591 Ob03202 753 m INTERNATIONAL TELECOMMUNICATION UNION ITU-T TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS OPEN SYSTEMS INTERCONNECTION - CONNECTIONLESS-MODE PROTOCOL SPECIFICATIONS X.236 (04195) INFORMATION TECHNOLOGY - OPE
2、N SYSTEMS INTERCONNECTION - CONNECTIONLESS PRESENTATION PROTOCOL: PROTOCOL SPECIFICATION ITU-T Recornmendation X.236 (Previously “CCITT Recommendation”) ITU-T RECMN*Xm23b 95 4862571 Ob03203 b7T FOREWORD ITU (International Telecommunication Union) is the United Nations Specialized Agency in the field
3、 of telecommunications. The IT Telecornmunication Standardization Sector (ITU-T) is a permanent organ of the IZZT. Some 179 member countries, 84 telecom operating entities, 145 scientific and industrial organizations and 38 international organizations participate in IT-T which is the body which sets
4、 world telecommunications standards (Recommendations). The approval of Recommendations by the Members of IT-T is covered by the procedure laid down in WTSC Resolution No. 1 (Helsinki, 1993). In addition, the World Telecommunication Standardization Conference (WTSC), which meets every four years, app
5、roves Recommendations submitted to it and establishes the study programme for the following period. 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. The text of ITU-T Recommendation X.236 was app
6、roved on 10th of April 1995. The identical text is also published as ISO/IEC International Standard 9576-1. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. O ITU 1995 All right
7、s 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. ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS AND OPEN SYSTEM COMMUNICATIONS (February 1994) O
8、RGANIZATION OF X-SERIES RECOMMENDATIONS Subject area PUBLIC DATA NETWORKS Recommendation Series Services and Facilities Interfaces X.1-X. 19 X.20-X.49 I Maintenance I X. 150-X. 179 I Transmission, Signalling and Switching Network AsDects X.50-X.89 X.90-X. 149 Administrative Arrangements OPEN SYSTEMS
9、 INTERCONNECTION I Connection-mode Protocol Specifications I X.220-X.229 I _ _ X. 180-X. 199 Model and Notation Service Definitions x.200-x.209 X.2 10-X.2 19 Connectioiess-mode Protocol Specifications PICS Proformas _ _ - X.230-X.239 X.240-X.259 Protocol Identification Security Protocols X.260-X.269
10、 X.270-X.279 Layer Managed Objects Conformance Testing INTERWORKING BETWEEN NETWORKS I Naming, Addressing and Registration I X.650-X.679 I X.280-X.289 X.290-X.299 General Mobile Data Transmission Svstems X.300-X.349 X.350-X.369 I Commitment, Concurrency and Recovery I X.850-X.859 I Management MESSAG
11、E HANDLING SYSTEMS X.370-X.399 X.400-X.499 I OPEN DISTRIBUTED PROCESSING I X .900-X. 999 I DIRECTORY X.500-X.599 OS1 NETWORKING AND SYSTEM ASPECTS Networking X.600-X. 649 Abstract Syntax Notation One (ASN. 1) OS1 MANAGEMENT X.680-X.699 X.700-X.799 SECURITY OS1 APPLICATIONS X. 800-X. 849 Transaction
12、Processing Remote ODerations X.860-X.879 X.880-X.899 1 2 3 4 5 6 7 8 9 10 CONTENTS Scope Normative references . 2.1 Identical Recommendations I International Standards 2.2 Paired Recommendations I International Standards equivalent in technical content Definitions 3.1 Reference Model definitions . 3
13、.2 Naming and addressing definitions . 3.3 Service conventions definitions 3.4 Presentation Service definitions Abbreviations . 4.1 Data Units . 4.2 Types of presentation-protocol-data-units 4.3 Other abbreviations . 5.1 Service provided by the Presentation Layer . 5.2 Service assumed from the Sessi
14、on Layer 5.3 Functions of the Presentation Layer 5.4 Model of the Presentation Layer . Elements of Procedure . 6.1 PPDU transfer . 6.2 Procedure Overview of the connectionless presentation protocol . Mapping of PPDUs onto the session-service . Structure and encoding of UD PPDU 8.1 General 8.2 Struct
15、ure of SS-user data parameter values 8.3 8.4 Encoding of values of type User-data . Conformance 9.1 Dynamic Conformance . 9.2 Static Conformance . 9.3 Precedence Encoding of SS-user data parameter values Protocol implementation conformance statement . Annex A A.l General A.2 Convention for entries i
16、n the state table ITU-T Rec . X.236 (1995 E) Page 1 1 1 2 2 2 3 3 3 3 3 3 3 4 4 4 4 4 5 5 6 7 7 7 7 9 9 10 10 10 10 10 11 11 11 1 ITU-T RECNN*X.236 95 YB62591 Ob03206 3T9 Summary This Recommendation provides the protocol for the OS1 connectionless-mode Presentation service which is defined in ITU-T
17、Recommendation X.216. ITU-T Rec. X.236 (1995 E) - ITU-T RECMN*Xm23b 95 48b2593 Ob03207 235 Introduction This Recommendation I International Standard is one of a set of Recommendations I International Standards produced to facilitate the interconnection of information technology. The set of Recommend
18、ations I International Standards covers the services and protocols required to achieve such interconnection. This Recommendation I International Standard is positioned with respect to other related Recommendations I International Standards in the set by the layers defined in the Reference Model for
19、Open Systems Interconnection (see IW-T Rec. X.200 I ISOIEC 7498-1). In particular, it is protocol of the presentation layer. It is most closely related to the Presentation Service Definition (see ITU-T Rec. X.216 I ISO/IEC 8822) and the Session Service Definition (see IT-T Rec. X.215 I ISOIEC 8326).
20、 The interrelationships of these Recommendations I International Standards are depicted below: Presentation Service Definition Connectionless Presentatiion Protocol Specification session Service Definition TIC03030-94/601 The structure of this Recommendation I International Standard is similar to th
21、e structure of the connection-oriented Presentation Protocol specification in order to facilitate cross reference between the two Recommendations I International Standards. ITU-T Rec. X.236 (1995 E) . 111 ITU-T RECMNxX.23b 95 = 4862571 Ob03208 171 ISO/IEC 9576-1 : 1995 (E) INTERNATIONAL STANDARD ITU
22、-T RECOMMENDATION INFORMATION TECHNOLOGY - OPEN SYSTEMS INTERCONNECTION - CONNECTIONLESS PRESENTATION PROTOCOL: PROTOCOL SPECIFICATION 1 Scope This Recommendation I International Standard) specifies a) b) procedures for the transfer of data and control information from one presentation-entity to a p
23、eer presentation-entity ; the structure and encoding of the presentation-protocol-data-units used for the transfer of data and control information. The procedures are defined in terms of c) d) e) the interactions between peer presentation-entities through the exchange of esentation-protocol-data-uni
24、ts; the interactions between a presentation-entity and the presentation-service-user in the same system through the exchange of presentation-service primitives; the interactions between a presentation-entity and the session-service-provider through the exchange of session-service primitives. These p
25、rocedures are defined in the main text of this Recommendation I International Standard supplemented by state tables in Annex A. These procedures are applicable to instances of communication between systems which support the Presentation Layer of the OS1 Reference Model and which wish to transfer pre
26、sentation service data units using connectioniess-mode presentation service primitives. This Recommendation I International Standard also specifies conformance criteria for systems implementing these procedures. It does not contain tests which can be used to demonstrate this conformance. 2 Normative
27、 references The following Recommendations and International Standards contain provisions which, through reference in this text, constitute provisions of this Recommendation I International Standard. At the time of publication, the editions indicated were valid. All Recommendations and Standards are
28、subject to revision, and parties to agreements based on this Recommendation I International Standard are encouraged to investigate the possibility of applying the most recent edition of the Recommendations and Standards listed below. Members of IEC and IS0 maintain registers of currently valid Inter
29、national Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently valid ITU-T Recommendations. 2.1 Identical Recommendations I International Standards - ITU-T Recommendation X.200 (1994) I ISOAEC 7498-1: 1994, Information technology - Open Systems Interconnect
30、ion - Basic Reference Model: The Basic Model. ITU-T Recommendation X.210 (1993) I ISOAEC 10731:1994, Information technology - Open Systems Interconnection - Basic Reference Model - Conventions for the definition of OS1 services. - ) The implementation and use of this Recommendation I International S
31、tandard requires the public assignment of values of ASN.1 type OBJECT IDENTIFIER to specifications of abstract syntaxes and transfer syntaxes. Procedures for the naming of abstract syntaxes are contained in IIZT-T Rec. X.216 I ISO/IEC 8822. Procedures for the naming of transfer syntaxes are containe
32、d in ITU-T Rec. X.226 I ISO/IEC 8823-1. ITU-T Rec. X.236 (1995 E) 1 ITU-T RECMN*X=236 95 = YBb2591 Ob03209 008 ISOAEC 9576-1 : 1995 (E) - ITU-T Recommendation X.215 (1994) I ISO/IEC 8326:.2), Information technology - Open Systems Interconnection - Session service definition. ITU-T Recommendation X.2
33、16 (1994) I ISO/IEC 8822: 1994, Information technology - Open Systems Interconnection - P resenfation service definition. ITU-T Recommendation X.226 (1994) I ISO/IEC 8823-1: 1994, Information technology - Open Systems Interconnection - Connection-oriented presentation protocol: Protocol specificatio
34、n. ITU-T Recommendation X.256 (1995) I ISOAEC 9576-2:1995, Information technology - Open Systems Interconnection - Connectionless presentation protocol: Protocol Implementation Conformance Statement (PICS) proforma. CCITT Recommendation X.660 (1992) I ISO/IEC 9834-1:1993, Information technology - Op
35、en Systems Interconnection - Procedures for the operation of OSI Registration Authorities: General procedures. ITU-T Recommendation X.680 (1994) I ISOAEC 8824-1:1995, Information technology -Abstract Syntax Notation One (ASN. I): Specijcation of the basic notation. ITU-T Recommendation X.681 (1994)
36、I ISO/IEC 8824-2: 1995, Information technology -Abstract Syntax Notation One (ASN. I): Information object spec$cation. ITU-T Recommendation X.682 (1994) I ISO/IEC 8824-3: 1995, Information technology - Abstract Syntax Notation One (ASN. I): Constraint specification. IT-T Recommendation X.683 (1994)
37、I ISOAEC 8824-4:1995, Information technology - Abstract Syntax Notation One (ASN. 1 ): Parameterization of ASN. I specifications. IT-T Recommendation X.690 (1 994) I ISO/IEC 8825- 1 : 1995, Information technology - ASN. I encoding rules: Specifzcation of Basic Encoding Rules (BER), Canonical Encodin
38、g Rules (CER) and Distinguished Encoding Rules (DER). - - - - - - - - - 2.2 Paired Recommendations I International Standards equivalent in technical content - CCITT Recommendation X.650 (1992), Open Systems Interconnectkm (OSI) - Reference Model for naming and addressing. IS0 7498-3: 1989, Informati
39、on processing systems - Open System Interconnection - Basic Reference Model - Part 3: Naming and addressing. 3 Definitions 3.1 Reference Model definitions This Recommendation I International Standard is based on the concepts developed in ITU-T Rec. X.200 I ISO/IEC 7498-1 and makes use of the followi
40、ng terms derived from it: a) Presentation Layer; b) presentation-protocol-data-unit; c) presentation-service; d) presentation-service-access-point; e) presentation-service-data-unit; f) presentation-protocol-control-information; g) Session Layer; h) session-service-data-unit; i) session-service-acce
41、ss-point; j) transfer syntax; k) (N)-connectionless-mode-transmission. *) To be published. 2 ITU-T Rec. X.236 (1995 E) ITU-T RECMN*X=23b 95 4862571 Ob03210 82T = ISO/IEC 9576-1 : 1995 (E) 3.2 Naming and addressing definitions This Recommendation I International Standard makes use of the following te
42、rms defined in CCITT Recommendation X.650 I IS0 7498-3: a) session-address; b) presentation-address; c) presentation-selector. 3.3 Service conventions definitions This Recommendation I International Standard makes use of the following terms defined in ITU-T Rec. X.210 I ISO/IEC 10731 as they apply i
43、n the hesentation Layer: service-user; service-provider; service primitive; request; indication; non-confirmed-service. 3.4 Presentation Service definitions This Recommendation I International Standard is also based on concepts developed in ITU-T Rec. X.216 I ISO/IEC 8822 and makes use of the follow
44、ing terms defined therein: a) abstract syntax; b) abstract syntax name; c) transfer syntax name; d) presentation data value; e) presentation context; f) default context. 4 4.1 4.2 4.3 Abbreviations Data Units PPDU Presentation Protocol Data Unit PSDU Presentation Service Data Unit SSDU Session Servi
45、ce Data Unit Types of presentation-protocol-data-units UD PPDU Unit Data PPDU Other abbreviations ASN. 1 PPCI presentation-protocol-control-information PPM presentation protocol machine PS presentation-service PSAP presentation-service-access-point PS-user presentation-service-user ss session-servic
46、e SSAP session-service-access-point Abstract Syntax Notation One (see ITU-T Rec. X.680 I ISO/IEC 8824-1, ITU-T Rec. X.681 I ISOAEC 8824-2, IT-T Rec. X.682 I ISO/IEC 8824-3, ITU-T Rec. X.683 I ISO/IEC 8824-4) ITU-T Rec. X.236 (1995 E) 3 ISOLEC 9576-1 : 1995 (E) Primitive S-UNIT-DATA request 5 Overvie
47、w of the connectionless presentation protocol Parameters Calling-session-address Called-session-address Quality of Service SS-user data 5.1 The protocol specified in this Recommendation I International Standard supports the connectionless-mode presentation- service. The connectionless-mode presentat
48、ion-service is defined in ITU-T Rec. X.216 I ISO/IEC 8822. The connectionless-mode presentation-service primitives are summarized in Table 1. Service provided by the Presentation Layer Table 1 - Presentation Service Primitives Primitive I P-UNIT-DATA request P-UNIT-DATA indication Parameters Caliing
49、-presentation-address Called-presentation-address Presentation context definition list Quality of Service User data Calling-presentation-address Called-presentation-address Presentation context definition list User data I I 5.2 The protocol specified in this Recommendation I International Standard can operate only over the connectionless-mode session-service indicated in Table 2 and defined in IW-T Rec. X.215 I ISO/IEC 8326. Service assumed from the Session Layer Table 2 - Session Service Primitives I I S-UNIT
