BS ISO/IEC 9040:1997

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Information technology. Open systems interconnection. Virtual terminal basic class service

Published By	Publication Date	Number of Pages
BSI	1997	98

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Categories: 35.100.60 - Presentation layer, BSI

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Description

This International Standard defines, in an abstract way, the externally visible Basic Class Virtual Terminal Service within the OSI Application Layer in terms of

a 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.

Figure 1 Relationship of this International Standardto other OSI Application Layer Standards

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 oriented 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 devicescan be modelled using virtual terminal device objects linked to the other virtual terminal objects.

Additional information

Status	Definitive
Pages	98
Publication Date	1997-10-15
ISBN	0 580 28588 X
Standard Number	BS ISO/IEC 9040:1997
Title	Information technology. Open systems interconnection. Virtual terminal basic class service
Identical National Standard Of	ISO/IEC 9040:1997
Replaces	BS ISO 9040:1990
Descriptors	Data processing, Information exchange, Application layer (OSI), Data transfer, Computer technology, Computer graphics, Data transmission, Communication procedures, Data transmission control procedures, Open systems interconnection
Publisher	BSI
Committee	ICT/1
ICS Codes	35.100.60 - Presentation layer

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BS ISO/IEC 9040:1997

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