BS ISO/IEC ISP 11185-16:1995 Information technology. International standardized profiles FVT2nn. Virtual terminal basic class. Register of control object type definitions - Part 16. FVT2114. Terminal signal titles control object
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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 10000-1. Such Profiles are divided into a number of different classes and sub-classes. Two of these classes contain sub-classes comprising functions of the Virtual Terminal Basic Class Service and Protocol specified in the base Standards ISO 9040 and ISO 9041. These are the Application Profiles (A-Profiles) and the Interchange Format and Representation Profiles (F-Profiles).
The relationship between A-Profiles and F-Profiles is described in 7.3.2 of ISO/IEC TR 10000-1 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. lt is the purpose of F-Profiles to specify such information sindures. Particular functional requirements may then be met by the combination of an A-Profile with one or more F-Profiles.
Establishment of a Wassociation involves the seleclion by negotiation of a particular Virtual Terminal Environment Profile (VTE-profile), and of particular values for any arguments of that VTEProfile. The VTE-Profile specification, and possibly also the values of certain VTE-Profile arguments, may in turn reference ihe definitions of VT control Object types and assignment types. These VTE-profiles, control Object types and assignment types are thus information structures that require expllcit reference within the VT protocol. Particular instances of these structures are fully defined within the base Standards, but the base Standards also provide for further instances to be defined by registration. Each registered instance constitutes an F-Profile within the frarnework of ISO/IEC TR 10000.
The Virtual Terminal Basic Class Service and Protocol may be used to realise a wide range of distinct functions. Particular functions may be realised through the selection of appropriate VT functional units, F-Profiles and other VTE-Profile argument values. The specification of the selection required to realise a parkular funclion 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 VT Application Profiles are each published as a separate multi-part ISP as follows:
- ISO/IEC ISP 11184 is the Register of VTEprofiles:
- ISO/IEC ISP 11185 is the Register of control Object type definitions;
- lSO/lEC ISP 11186 is the Register of assignment-type definitions:
- ISO/IEC ISP 11187 contains the specifications of VT Application Profiles.
This part of ISO/IEC ISP 11185 contains the definition of a control Object type that may be used by an Application WUser to associate Mies, intended to be meaningful to a human user at an end-terminal system, with any of the terminal Signals supported by the Sequenced and Unsequenced Terminal CO types (taxonomy identifiers M’213 and fW214) defined in part 2 of lSO/IEC ISP 11185.
1.2 Position within the taxonomy
The taxonomy of International Standardized Profiles for OSI is laid down in ISO/IEC TR 10000-2. Wrthin the classification scheme of this taxonomy, the OSI Profiles specified in this International Standardized Profile 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 ihe Profile within 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 dlgit,
In principle the ISO Viktual Terminal model allows for multiple classes of Operation, although at the time of publicatlon of this International Standardized Profile only the Basic Class has been defined. The value of the identifier component a distinguishes between distinct iypes of information Object as follows:
- a= 1 for Basic Class VTE-profiles;
- u= 2 for Basic Class Control Objects;
- u = 3 for Basic Class Assignment Types.
Values of u greater than 3 are reserved for future developments.
This International Standardtzed Profile ISO/IEC ISP 11185 contains the specifications of the Profiles with ldentifiers of the forrn FVT2bc. For lhis form of ldentifier, the component b distinguishes between the five major classifications of Basic Class Control Objects as follows:
- b = 1 for Mlscellaneous Control Objects:
- b = 2 for Fleld Entry lnstruction Control Objects;
- b = 3 for Fjeld Entry Pilot Control Objects:
- b = 4 for Reference Information Objects:
- b = 5 for Termination Condiiions Control Objects.
Each of these classifications corresponds to a subregister 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 classificaiions of Basic Clcrss Control Objects that may be defined in future amendments to ISO 9040.
This part of ISO/IEC ISP 11185 contains the definitlon of the Miscellaneous Control Object type with the Profile identifier
FVT2114 - Terminal Signal Titles Control Object.
1.3 Scenario
The specification of ihe Vlrtual Terminal Service is given in ISO 9040. lt is based on a model in which two Wusers communicate by means of a shared Conceptual Communication Area (CCA) that is a conceptual part of the VT service-provider, Information exchange ls modelled by one Wuser updating the content of the CCA and the changed state of the CCA then being made accessible to the peer VT-user.
Control objects (COS) form one of the types of informalion Object that may be present in the CCA. This ls illustrated in figure 1, in which CO-l, CO-2. . . . CO-n represent a nurnber of different control objects present in the CCA The negotfation during establishment of a Wassociation will determine wheiher or not these will include conirol objects of either or both of the types whose definitions are given in this part of ISO/IEC ISP 11185.
The CCA Is structured by the Virtual Terminal Service into a number of components. For a control Object the Data Structure Definition (DSD) component of ihe CCA contains the syntax of its infonnation content, 2 including the fange of possible values and the permitted update operations, The current value of its informatfon content is contained in the Contiol, Signal and Status store (CSS) component. Updates to the current value take place through the issue of VT Service primitives by one Wuser to the serviceprovider. 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.
Computer applications; Application layer (OSI); Computer-computer communications; Communication procedures; Open systems interconnection; Information exchange; Data transfer; Computer software; Syntax
BS ISO/IEC ISP 11185-16:1995 Information technology. International standardized profiles FVT2nn. Virtual terminal basic class. Register of control object type definitions - Part 16. FVT2114. Terminal signal titles control object
