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1、INTERNATIONAL STANDARDIZED PROFILE ISO/IEC ISP 11187-6 First edition 1996-06-I 5 Information technology - International Standardized Profiles AVTln, AVT2n - Virtual Terminal Basic Class - Application Profiles - Part 6: AVTI 5 - A-mode Transparent Application Profile Technologies de /information - Pr
2、ofils normalis - European Workshop for Open Systems (EWOS); - Open Systems Environment Implementors Workshop (OIW). ISO/IEC ISP 11187 consists of the following parts, under the general title Information technology - International Standardized Profiles A VTln, A VT2n - Virtual Terminal Basic Class -
3、Application Profiles: - Part l:Common VT Protocol Requirements List - Part 2:Common Supporting Layers Requirements List - Part 3:AVT22 - S-mode Forms Application Projle - Part 4:AVT23 - S-mode Paged Application Profile - Part 5:A VT1 6 - A-mode Generalized Telnet Application Projle - Part 6:AVTl5 -
4、A-mode Transparent Application Projile Annexes A and B form an integral part of this part of ISO/IEC ISP 11187. . . . 111 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 21:27:55
5、 MDTNo reproduction or networking permitted without license from IHS -,-,- ISODEC ISP 111876: 1996(E) 0 ISOiIEC Introduction ISO/IEC ISP 11187 is defined within the context of Functional Standardization, in accordance with the principles specified in ISO/IEC TR 10000, “Framework and Taxonomy of Inte
6、rnational Standardized Profiles”. The context of Functional Standardization is one part of the overall field of Information Technology (IT) standardization activities, covering base standards, profiles and registration mechanisms. This International Standardized Profile contains Open Systems Interco
7、nnection (OSI) Application Profiles (A-profiles) defined within the framework of ISO/IEC TR 10000 for the Virtual Terminal Basic Class Service and Protocol that is specified in IS0 9040 and IS0 904 1. This part of ISO/IEC ISP 11187 was developed in close cooperation between the three Regional OS1 Wo
8、rkshops, namely the OSE Implementors Workshop (OIW) of the United States, the European Workshop for Open Systems (EWOS) and the Asia-Oceania Workshop (AOW). It was developed under the editorship of OIW from a functional standard specified in the OIW Stable Implementation Agreements Version 5. The te
9、xt is harmonized between these three Workshops and it has been ratified by the plenary assemblies of each Workshop. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 21:27:55 MDTNo
10、 reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARDIZED PROFILE 0 ISO/IEC ISO/IEC ISP 11187-6:1996(E) Information technology - International Standardized Profiles AVTln, AVT2n - Virtual Terminal Basic Class - Application Profiles - Part 6: AVT 15 - A-mode Tran
11、sparent Application Profile 1 Scope 1.1 General The concept of Profiles for OSI, and the structure of the International Standardized Profiles that document them, are defined in ISO/IEC TR lOOOO- 1. Such Profiles are divided into a number of different classes and sub-classes. Two of these classes con
12、tain sub-classes comprising functions of the Virtual Terminal Basic Class Service and Protocol specified in the base standards IS0 9040 and IS0 9041. These are the Application Profiles (A-Profiles) and the Interchange Format and Representation Profiles (F-Profiles). The relationship between A-Profil
13、es and F- Profiles is described in 7.3.2 of ISO/IEC TR 10000-l and is as follows. Application Layer base standards require, implicitly or explicitly, the structure of information carried or referenced by them to be specified for each instance of communication. It is the purpose of F-Profiles to spec
14、ify such information structures. Particular functional requirements may then be met by the combination of an A-Profile with one or more F- Profiles. Establishment of a VT-association involves the selection by negotiation of a particular Virtual Terminal Environment profile (VTE-profile), and of part
15、icular values for any arguments of that VTE-profile. The VTE-profile specification, and possibly also the values of certain VTE-profile arguments, may in turn reference the definitions of VT control object types and assignment types. These VTE-profiles, control object types and assignment types are
16、therefore Information Objects that require explicit reference within the VT protocol. Particular instances of these Information Objects are fully defined within the base standards, but the base standards also provide for further instances to be defined by registration. Each registered instance const
17、itutes an F-Profile within the framework of ISO/IEC TR 10000. The Virtual Terminal Basic Class Service and Protocol may be used to realize a wide range of distinct functions. Particular functions may be realized through the selection of appropriate VT functional units, F-Profiles and other VTE-profi
18、le argument values. The specification of the selection required to realize a particular function and to promote interoperability constitutes a Virtual Terminal A-Profile within the framework of ISO/IEC TR 10000. The three International Registers of VT information structures and the specifications of
19、 VT Application Profiles are each published as a separate multi-part ISP as follows: - ISO/IEC ISP 11184 is the Register of VTE- profiles; - ISO/IEC ISP 11185 is the Register of control object type definitions; 1 Copyright International Organization for Standardization Provided by IHS under license
20、with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 21:27:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC ISP 111874 1996(E) 0 ISO/IEC - ISO/IEC ISP 11186 is the Register of assignment-type definitions; - ISO/IEC ISP 11187 contains
21、the specifications of VT Application Profiles. This part of ISO/IEC ISP 11187 is applicable to environments in which a terminal population requires access to application packages running on a variety of computers. It may be used where the connection between the terminal and the computer that hosts t
22、he application package is local, is made across a Local or Wide Area Network, or is made across a concatenation of such networks. This part of ISO/IEC ISP 11187 contains the definitions of the A-mode Transparent Profile that may be used to provide a transparent mode of operation which allows VT-user
23、s to exchange transparently uninterpreted sequences of characters with the added benefit of delivery control to enable the VT-users to determine when the character sequences are to be delivered. This A-profile specifies a mode of operation of, and a selection of options for use with, the A-mode Tran
24、sparent VTE-profile FVTl14. These are together designed to provide versatility and to promote interoperability between Virtual Terminal implementations which support that VTE-profile. This part of ISO/IEC ISP 11187 also specifies a Profile ICS proforma for the A-mode Transparent Application Profile
25、specified herein in compliance with the relevant requirements, and in accordance with the relevant guidance, given in ISO/IEC 9646-7. The supplier of an implementation which is claimed to conform to ISO/IEC ISP 11187-6 is required to complete a copy of the Profile ICS proforma as specified in 5.2 an
26、d is required to provide the information necessary to identify both the supplier and the implementation. 1.2 Position within the taxonomy The taxonomy of International Standardized Profiles for OS1 is laid down in ISO/IEC TR 10000-2. Within the classification scheme of this taxonomy, the OS1 Profile
27、s specified in this International Standardized Profile are in the Virtual Terminal sub-class of the class of Application Profiles. A Profile within this subclass has a Profile identifier of the form AVTab, where ab is a structured numerical identifier that identifies the position of the Profile with
28、in two levels of subdivision of the subclass. The value of a is a single digit but b is an integer that is not necessarily a single digit. In principle the IS0 Virtual Terminal model allows for multiple classes of operation, although at the time of publication of this International Standardized Prof
29、ile only the Basic Class has been defined. The value of the identifier component a distinguishes between the permitted modes of operation of the Virtual Terminal Service as follows: - a = 1 for Basic Class A-mode ( asynchronous mode ); - a = 2 for Basic Class S-mode (synchronous mode ). Values great
30、er than 2 are reserved for future developments. ISO/IEC ISP 11187 contains the specifications of the Profiles with identifiers of the form AVTlb and AVT2b. The component b distinguishes between different Application Profiles that make use of the same mode of operation. This part of ISO/IEC ISP 11187
31、 contains the specification of the Application Profile with the Profile identifier AVT 15 - A-mode Transparent Application Profile. 1.3 Scenario The VT Basic Class Service is defined in IS0 9040. It operates within the OS1 Reference Model defined in ISO/IEC 7498-l to provide facilities for interacti
32、ve terminal-oriented communication between two application- processes. The aspects of an application-process that make use of these facilities constitute a VT- user as defined in IS0 9040. Figure 1 illustrates the elements of the OS1 model that are concerned with communication between two VT-users i
33、n accordance with a VT Application Profile. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 21:27:55 MDTNo reproduction or networking permitted without license from IHS -,-,- 0
34、 ISOAEC ISO/IEC ISP 11187-6: 1996(E) AP-Invocation 1 VT-user A 1 Service (qS0 8822) Prewhtion- entity-lavoention ACSF ASEI I I CO TSession I I Service (T-Profile) Figure 1 - Interactive VT communication between two end systems The VT-user component of an application- process (AP) communicates by inv
35、oking an application-entity (AE) to establish a VT- association with an application-entity of a peer application-process. In order to provide the VT Basic Class Service to their VT-users, two AE- invocations (AEIs) exchange information by means of both the VT Basic Class Protocol specified in IS0 90
36、41-l and the ACSE Protocol specified in IS0 8650. The VT Basic Class Service enables the VT-users to exchange data that may include control information related to virtual terminal functions and to real devices. In the model of the OS1 Application Layer given in ISO/IEC 9545 the AE is a composition o
37、f two application-service-elements (ASEs)and a Control Function (CF). It is the CF that provides the VT Service to the VT-user. The ASEs are the VT ASE and the ACSE. In an AEI the CF provides the functions of the VT Service by making coordinated use of the services provided to it by invocations of e
38、ach of the two ASEs. Each ASE- invocation (ASEI) in turn provides its services by an exchange of APDUs with its peer, for which it requires the use of the Connection-oriented Presentation Service. These requirements of the two ASEIs are passed to the CF, which coordinates them and makes the actual u
39、se of the Presentation Service. An AEI operates in accordance with rules determined by an application-context. The definition of the application-context for a VT- association is provided by clause 11 of IS0 9041-l. A VT Application Profile specifies constraints on the operation of an AEI within the
40、application- context defined in IS0 9041- 1. It also specifies constraints on the use of the Presentation Layer by such an AEI and on the consequent use of the Session Layer by the Presentation Layer. A VT Application Profile is intended to be used in conjunction with any Transport Profile (T-Profil
41、e) of ISO/IEC TR 10000-2 that provides a 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/18/2007 21:27:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/
42、JEC ISP 11187-6: 1996(E) 0 ISO/IEC connection-mode Transport Service for use by the Session Layer. A VT Application Profile may also specify constraints on the exchange of control information between the VT-users and on the behavior of a VT-user in response to information exchanged. An AP-invocation
43、 may make concurrent or consecutive use of more than one AE-invocation. An AE-invocation may be a partner in one or more application-associations, either concurrently or consecutively. A VT-association is an application-association capable of supporting communication between two VT ASEs. The VT Appl
44、ication Profiles specified in ISO/IEC ISP 11187 are concerned solely with the operation of a VT- association. They place no constraint on any other application-associations of the AE-invocation concerned or on any other AE-invocation belonging to the AP-invocation concerned. The VT Application Profi
45、le specified in this part of ISO/IEC ISP 11187 assumes a relationship between the two communicating end systems described below. One end system ( the keyboard side ) assumes an initiator fimction and the other side assumes the responder l?mction ( the application side ). These two devices form part
46、of the VT-user component of that end system and are modelled within the data structures of the VT Service. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this part of ISO/IEC ISP 11187. At the time of publication, the
47、 editions indicated were valid. All documents are subject to revision, and parties to agreements based on this part of ISO/IEC ISP 11187 are warned against automatically applying any more recent editions of the documents listed below, since the nature of references made by ISPs to such documents is
48、that they may be specific to a particular edition. Members of IEC and IS0 maintain registers of currently valid International Standards and ISPs, and ITU-T maintains published editions of its current Recommendations. IS0 2375:1985, Data processing,j- Procedure for registration of escape sequences. I
49、SO/IEC 7498- 1: 1994, Information technology - Open Systems Interconnection - Basic Reference Model: The Basic Model. (See also ITU-T Recommendation X.200.) IS0 8326: 1987*, Information processing systems - Open Systems Interconnection - Basic connection onented session service dejnition. (See also CCITT Recommendation X.21 5.) IS0 8327: 1987*), Information processing syst