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1、INTERNATIONAL STANDARDIZED PROFILE ISO/IEC ISP 11185-13 First edition 1995-06-I 5 Information technology - International Standardized Profiles FVT2nn - Virtual Terminal Basic Class - Register of control object type definitions - Part 13: FVT2111 - Waiting Time Control Object Technologies de /informa
2、tion - Profils normalis - European Workshop for Open Systems (EWOS); - Open Systems Environment Implementors Workshop (OIW). This International Standardized Profile ISO/IEC ISP 11185 forms an International Register of information objects in accordance with the procedures for the operation of OSI Reg
3、istration Authorities laid down in ISO/IEC 9834. It is issued in parts, with additional parts being issued as further entries are added to the register. Each part is prepared in accordance with an approval and maintenance process laid down by the Special Group on Functional Standardization of ISOilE
4、C JTC 1, information technology. ISO/IEC ISP 11185 is issued under the general title lnfofmation technology - lnternational Standardized Profiles M2nn - Virtual Terminal Basic Class - Register of control object type definitions. At present the following pans are published or are in the course of pre
5、paration: - Part 1: FVT211, M212 - Sequenced and - ISO/IEC ISP 11185 is the Register of control object type definitions; - ISO/IEC ISP 11186 is the Register of assignment-type definitions; - ISO/IEC ISP 11187 contains the specifications of VT Application Profiles. This part of lSO/lEC ISP 11185 cont
6、ains the definition of a control object type that may be used to set a time limit associated with data entry into the display object during S-mode operation of a VT-association. The significance of the expiry of this time limit does not form part of this definition and should be specified by any VI-
7、E-profile that references a control object of this type. 1.2 Position within the taxonomy The taxonomy of International Standardized Profiles for OSI is laid down in ISO/IEC TR 10000-2. Within the classification scheme of this taxonomy, the OSI Profiles specified in this International Standardized P
8、rofile are in the Virtual Terminal Registered Object sub-class of the class of Interchange Format and Representation Profiles. A Profile within this subclass has a Profile identifier of the form FVTabc, where abc is a structured numerical identifier that identifies the position of the Profile within
9、 each of the three levels of subdivision of the subclass. The values of a and b are single digits but c 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 Internationa
10、l Standardized Profile only the Basic Class has been defined. The value of the identifier component a distinguishes between distinct types of information object as follows: - a = 1 for Basic Class VTE-profiles; Copyright International Organization for Standardization Provided by IHS under license wi
11、th ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:01:14 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC ISP 11185-I 3: 1995(E) 0 ISO/IEC - a = 2 for Basic Class Control Objects; - a = 3 for Basic Class Assignment Types. Values of a greater
12、than 3 are reserved for future developments. This international Standardized Profile ISO/IEC ISP 11185 contains the specifications of the Profiles with identifiers of the form FVT26c. For this form of identifier, the component b distinguishes between the five major classifications of Basic Class Con
13、trol Objects as follows: - b = 1 for Miscellaneous Control Objects; - b = 2 for Field Entry instruction Control Objects; - b = 3 for Field Entry Pilot Control Objects; - b = 4 for Reference Information Objects; - b = 5 for Termination Conditions Control Objects. Each of these classifications corresp
14、onds to a sub-register under the procedures of ISO/IEC 9834-5. The identifier component c is the serial number of the control object type in the appropriate sub-register. Values of b greater than 5 are reserved for new classifications of Basic Class Control Objects that may be defined in future amen
15、dments to IS0 9040. This part of ISO/IEC ISP 11185 contains the definition of the Miscellaneous Control Object type with the Profile identifier FVT2111 - Waiting Time Control Object. 1.3 Scenario The specification of the Virtual Terminal Service is given in IS0 9040. It is based on a model in which
16、two VT-users communicate by means of a shared Conceptual Communication Area (CCA) that is a conceptual part of the VT service-provider. Information exchange is modelled by one VT-user updating the content of the CCA and the changed state of the CCA then being made accessible to the peer VT-user. VT-
17、user A VT service prlmltives VT-user B VT service-provlder Figure 1 - Control objects in the VT Service model Control objects (COs) form one of the types of information object that may be present in the CCA. This is illustrated in figure 1, in which CO-l, CO-2, . . . CO-n represent a number of diffe
18、rent control objects present in the CCA. The negotiation during establishment of a VT-association will determine whether or not these will include a control object of the type whose specification is given in this part of ISO/IEC ISP 11185. The CCA is structured by the Virtual Terminal Service into a
19、 number of components. For a control object the Data Structure Definition (DSD) component of the CCA contains the syntax of its information content, including the range of possible values and the permitted update operations. The current value of its information content is contained in the Control, S
20、ignal and Status store (CSS) component. Updates to the current value take place through the issue of VT service primitives by one VT-user to the service-provider. Changes of state of the CCA are made accessible through the issue of VT service primitives by the service-provider to the peer VT-user. B
21、y clause 14 of IS0 9040, COs enable VT-users to handle control information related to virtual terminal functions and to real devices. This control is exercised by the VT-users through semantics associated with the information content and with the update operations of the CO. Definition of the semant
22、ics, or specification of the source of the semantics if the semantic details are not fully prescribed, forms part of the registered definition of the CO. These semantics are not however of concern to the VT service-provider itself. The DSD will contain an ASN.l object identifier that identifies the
23、registered definition, but the VT service-provider merely acts as a repository of this value. It is only the VT-user that requires knowledge of the registered definition. NOTE 1 - The VTE-parameter values that determine the syntax of the information content may not be negotiated explicitly during as
24、sociation establishment. Moreover, in the case of non-parametric COs these values do not determine the details of the syntax. Such values and details form part of the registered definition of the CO. Since the VT service-provider is not required to have knowledge of this registered definition, in pr
25、inciple the VT-users provide the VT service-provider with such information through local management procedures. Whether or not this is necessary in practice depends on the configuration of the implementations concerned. Figure 2 - Control objects in the VT Protocol model The Virtual Terminal Protoco
26、l specification given in IS0 9041-l models the VT service-provider in terms of protocol exchange between two Virtual Terminal Protocol Machines (VTPMs), each with its own CCA. The CCA of each VTPM is updated both by service primitives received from its own VT- user and by protocol elements received
27、from the peer VTPM. Corresponding service primitives and protocol elements are issued by the VTPM to provide notification of changes to the content of its CCA. This is illustrated in figure 2. The control object type definition given in this part of ISO/IEC ISP 11185 is expressed in terms of this mo
28、del. For certain types of control object the abstract syntax of IS0 9041-l does not provide a complete specification for the 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:01:14 MD
29、TNo reproduction or networking permitted without license from IHS -,-,- 0 ISO/IEC ISO/IEC ISP 11185-l 3: 1995(E) representation of CO update operations. This arises where the abstract syntax of IS0 9041-I makes use of an ASN.l any type, or where symbolic values have to be encoded in terms of an ASN.
30、l integer type. Control object type definitions are required by ISO/IEC 9834-5 to provide the necessary refinement of the abstract syntax. NOTE 2 - Since an abstract syntax is made available for use through its inclusion in a presentation context, and since the Presentation service-provider has no k
31、nowledge of control object type definitions, in principle the VT-users provide the Presentation service-provider with these refinements to the abstract syntax through local management procedures. Whether or not this is necessary in practice depends on the configuration of the implementations concern
32、ed. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions of this part of ISO/IEC ISP 11185. At the time of publication, the editions indicated were valid. All documents are subject to revision, and parties to agreements based
33、on this International Standardized Profile 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 that they may be specific to a particular edition. Members of IEC and IS0 maintain registers o
34、f currently valid International Standards and ISPs, and ITU-T maintains published editions of its current Recommendations. ISO/IEC 8822:1994, Information technology - Open Systems Interconnection - Presentation service definition (second edition). (See also ITU-T Recommendation X.216.) ISO/IEC TR lO
35、OOO-2:1994, Information technology - Framework and taxonomy of international Standardized Profiles - Part 2: Principles and Taxonomy for OSI Profiles (third edition). ISO/IEC 10731:1994, information technology - Open Systems Interconnection - Basic Reference Model - Conventions for the definition of
36、 OSI services. (See also ITU-T Recommendation X.21 0.) 3 Definitions For the purposes of this part of ISO/IEC ISP 11185 the following definitions apply. 3.1 General OSI terminology 3.1.1 This pan of ISO/IEC ISP 11185 makes use of the following terms defined in ISO/IEC 10731: a) service primitive; b)
37、 service-provider. 3.1.2 This part of ISO/IEC ISP 11185 makes use of the following terms defined in ISO/IEC 8822: a) abstract syntax; b) presentation context. 3.1.3 This part of ISO/IEC ISP 11185 makes use of the following terms defined in ISO/IEC 8824: a) any type; b) object descriptor type; ISO/IE
38、C 8824: 1990, Information technology - Open Systems Interconnection - Specification of Abstract Svntax Notation c) object identifier. One (ASN.7) (second edition). Recommendation X.208.) (See also CCllT 3.1.4 This pan of ISO/IEC ISP 11185 makes use of the following terms defined in ISO/IEC 9834-l: I
39、S0 9040:1990, Information technology - Open Systems Interconnection - Virtual Terminal Basic Class Service. a) registration; IS0 9041-I : 1990, Information technology - Open Systems Interconnection - Virtual Terminal Basic Class Protocol - Part 1: Specification. ISO/IEC 9041-2: 1993, Information tec
40、hnology - Open Systems Interconnection - Virtual Terminal Basic Class Protocol - Part 2: Protocol Implementation Conformance Statement (PICS) Proforma. ISO/IEC 9834-l : 1993, Information technology - Open Systems Interconnection - Procedures for the Operation of OSI Registration Authorities - Part 1
41、: General Procedures. (See also CCllT Recommendation X.660.) b) registration-hierarchical-name. 3.2 Terminology of VT base standards 3.2.1 This pan of ISO/IEC ISP 11185 makes use of the following terms defined in IS0 9040: a) control object; b) device object; c) display object; d) object updating de
42、vice; ISO/IEC 9834-5:1991, Information technology - Open Systems Interconnection - Procedures for the Operation of OSI Registration Authorities - Part 5: Register of VT Control Object Definitions. ISO/IEC TR 10000-l :1992, information technology - Framework and taxonomy of International Standardized
43、 Profiles - Part 1: Framework (second edition). e) VT-user; 9 VTE-parameter; g) VTE-profile. 3.2.2 This part of ISO/IEC ISP 11185 makes use of the following term defined in IS0 9041-I: a) protocol element. 3 Copyright International Organization for Standardization Provided by IHS under license with
44、ISO Licensee=Defense Supply Ctr/9960866100 Not for Resale, 04/24/2007 10:01:14 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO/IEC ISP 11185-l 3: 1995(E) 0 ISO/IEC 4 Abbreviations 8 Date For the purposes of this International Standardized Profile the following abbreviat
45、ions apply. AOW OSI Asia-Oceania Workshop; EWOS European Workshop for Open Systems; OIW OSE Implementors Workshop; OSE Open Systems Environment. All other abbreviations used are defined in ISO/IEC TR 10000-l or IS0 9040. 5 Principles of conformance to VT Profiles An implementation of the Virtual Ter
46、minal Protocol conforms to an FVT2nn Profile that defines a control object type if the protocol implementation is capable of sending and -receiving PDUs corresponding to all update operations permitted for that CO type. Conformance of a protocol implementation to an FVT2rrn Profile does not place re
47、quirements on the ability of the implementation to negotiate the presence in the CCA of an instance of this CO type. Such requirements fall within the scope of conformance to an FVTlnn Profile that specifies a VTE-profile. The date of submission of this proposal was 1993-09-08. 9 Identifier The name
48、 assigned to an information object by an International Register is required by ISO/IEC 9834-l to be a registration-hierarchical-name. A registration-hierarchical- name may have more than one form. The permitted forms include an ASN.l object identifier as defined in ISO/IEC 8824 and a distinguished n
49、ame as defined in ISO/IEC 9594-2. In accordance with A.4 of ISO/IEC 9834-5, this register assigns the following object identifier form for the name of this register entry: iso(1) standard(O) 9834 vt-co-def(5) misco(0) 11 . In accordance with 20.1.1 of IS0 9040, this object identifier shall be used as the value of the CO-type-identifier VTE- parameter for a control object in order to identify this register entry as the source of the information structure and semantic conte