BS ISO/IEC ISP 11185-15:1995 Information technology. International standardized profiles FVT2nn. Virtual terminal basic class. Register of control object type definitions - Part 15. FVT2113. Field definition management control object
Withdrawn
Printed version of this is available at library. To request, please e-mail to referencepk@usm.my and include a copy of this record in your e-mail.
1.1 General
The concept of Profiies for OSI, and the structure of the international Standardized Profiies Hat document ttiem, are defined in iSO/iEC TR 10000-1. Such Profiies are divided into a number of different ciasses and subciasses. Two of these ciasses contain subciasses comprising functions of the Virtuai Terminal Basic Ciass Service and Protocoi specified in i-he base Standards ISO 9040 and ISO 9041. These are the Appiication Profiies (A-Profiles) and the interchange Format and Representation Profiies (F-Profiles).
The relationship between A-Profiies and F-Profiies is described in 7.3.2 of iSO/iEC TR lCXlOO-1 and is as foiiows. Appiication 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 specify such information structures. Particuiar functionai requirements may then be met by the combination of an A-Profile with one or more F-Profiles.
Establishment of a Wassociation invoives the seiection by negotiation of a particuiar Virtuai Terminal Environment Profile (WE-profiie), and of particular vaiues for any arguments of that VTEProfile. The VTE-profile specification, and possibiy also the vaiues of certain VTE-Profile arguments, may in turn reference the definitions of VT controi Object types and assignment types. These VTE-profiles, controi Object types and assignment types are thus information structures that require expiicit reference within the VT protocoi. Particuiar instances of these structures are fufly defined within the base Standards, but the base standards also provide for furlher instances to be defined by registration. Esch registered instance constitutes an F-Profile within the frameyork of iSO/iEC TR 10000.
The Virtual Terminal Basic Ciass Service and Protocoi may be used to reaiise a wide fange of distinct functions. Pariicular functions may be reaiised through the seiection of appropriate VT functionai units, F-Profiies and other VTE-Profile argurnent vaiues. The specification of the seiection required to reaiise a parkuiar function and to promote interoperabiiity constitutes a Viiai Terminal A-Profile within the framework of iSO/iEC TR 10000.
The three international Registers of VT information structures and the specifications of VT Appiication Profiies are each pubiished as a separate multi-part ISP as foiiows:
- ISO/iEC iSP 11184 is the Register of VTEprofiles;
- 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 Appiication Profiles.
This part of iSO/iEC ISP 11185 contains the definition of a controi Object type that may be used to enhance the fieid definition capabiiities defined in the ISO 9040 and ISO 9041 VT standards in Order to provide a flexible mechanism for using and updating fieid definition records.
1.2 Position within the taxonomy
The taxonomy of international Standardized Profiles for OS1 is iaid down in iSO/IEC TR lOOOO=2. Within 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 Representatlon Profiles.
A Profile within this subclass has a Profile identifier of the form Mabc, where abc is a structured numerical identifier that identifies the positlon of the Profile within each of the three ieveis of subdivision of the subclass. The values of a and b are single dlgits but c is an integer that is not necessarily a single dlgit. in principle the ISO Virtual Terminal model allows for multiple classes of operation. aithough at the time of publication of this international Standardized Profile only the Basic Ciass has been defined. The value of the identifler component a distlnguishes between distinct types of information Object as foilows:
- a= 1 for Basic Ciass VTE-profiles;
- u= 2 for Basic Ciass Control Objects;
- a= 3 for Basic Ciass Assignment Types.
Values of a greater than 3 are reserved for future developments.
This international Standardized Profile iSO/IEC ISP 11185 contains the specificatlons of the Profiles with identifiers of the ferm fW2k. For this ferm of identifier, the component b dislinguishes between the five major classifications of Basic Class Control Objects as follows:
- b = 1 for Miscellaneous Control Objects;
- b = 2 for Fieid Entry instructlon Control Objects:
- b = 3 for Fieid Entry Pilot Control Objects;
- b = 4 for Reference Information Objects:
- b = 5 for Termination Conditlons 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 subregister. Vaiues of b greater than 5 are reserved for new classifications of Basic Class Control Objects that may be defined in future amendments to ISO 9040.
This part of ISO/IEC ISP 11185 contains the definitfon of the Mlsceilaneous Controi Object type with the Profile identifier
FVT2113 - Field Definition Management Control Object.
1.3 Scenario T
The specification of the Virtual Terminal Service is given in ISO 9040. it ls based on a model in which two VT-users communicate by means of a shared Conceptual Communicaiion Area (CCA) that is a concepiuaj part of the VT service-provider, Information exchange is modelled by one VTuser updatlng the content of the CCA and the changed state of the CCA then being made accessible to the peer VT-user.
Control objects (COS) ferm one of the types of information object that may be present in the CCA. lhis is illustrated in figure 1, in which CO-l, CO-2, . . . CO-n represent a number of different control objects present in the CCA. The negotiatlon during estabiishment of a VTassociation will determine whether or not these will inciude control objects of either or both of live types whose definitions are given in this part of iSO/IEC ISP 11185.
BS ISO/IEC ISP 11185-15:1995 Information technology. International standardized profiles FVT2nn. Virtual terminal basic class. Register of control object type definitions - Part 15. FVT2113. Field definition management control object
