• Title: ISO/IEC 9040:1997, Information technology - Open Systems Interconnection - Virtual Terminal Basic Class Service
  • Author: ISO/IEC JTC 1
  • Released: 2007-08-23
  • Language: English
  • Pages: 94
  • ASIN: B000Y2TVU4
This International Standard defines, in an abstract way, the externally visible Basic Class Virtual Terminal Service within the OSI Application Layer in terms ofa model defining the interaction between users of the service; the primitive actions and events of the service; the parameter data associated with each primitive action and event; the relationship between, and the valid sequences of, these actions and events. The service defined in this International Standard is that which is provided by the OSI Basic Class Virtual Terminal Protocol (in conjunction with the Association Control Service Element and the Presentation Service) and which may be used by any user including other Application Service Elements. The relationship between the standards for Virtual Terminal Service, Virtual Terminal Protocol, ACSE, Presentation Layer Service and the user of the Virtual Terminal Service is shown in figure 1.This International Standard also defines two standard default virtual terminal environment profiles and describes the form of registered virtual terminal environment profiles and control objects. Virtual terminal environment profiles define sets of virtual terminal environment parameters for use in the establishment of virtual terminal associations and subsequent negotiation. This International Standard also defines a structure of ASN.1 Object Identifiers for the objects defined in this International Standard and for use in a register of virtual terminal objects.This International Standard does not specify individual implementations or products, nor does it constrain the implementation of entities and interfaces within a computer system. There is, therefore, no requirement for conformance to this International Standard.This International Standard applies to interactive applications requiring terminal oriinted communication expressed in terms of the transmission and manipulation of graphical images having the following characteristics:the images are composed of character-box graphic elements organised into a one, two or three dimensional structure; attributes may be associated with any graphic element to qualify its mode of display. Control information for the communication can be modelled using virtual terminal control objects, and multiple devices can be modelled using virtual terminal device objects linked to the other virtual terminal objects.

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