The concept of Profiles for OSI, and the structure of the
International Standardized Profiles that document them, are defined in ISO/IEC TR 10000-l. 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-l. These are the Application Profiles (A-Profiles) and the Interchange Format and Representation Profiles (F-Profiles).
It is a requirement of ISO/IEC 9646-7 that the specification of a Profile shall provide a Profile Requirements List (Profile RL)
which modifies the ICS proformas of the referenced base standards. A Profile specification may in addition provide a
Profile Specific ICS proforma.
This part of ISO/IEC ISP 11187 specifies a Common RL for the
supporting layer protocols that shall be incorporated by reference into each VT Application Profile specified in other parts of ISO/IEC ISP 11187.
1.2 Position in 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 Profile are in the Virtual Terminal
sub-class of the class of Application Profiles.
A Profile within this subclass has a Profile Identifier of the form AVTab, where ab is a structured numerical identifier that
identifies the position of the Profile within two levels of the
subdivision of the subclass. The value of a is a single digit but b is an integer that is not necessarily a single digit.
In principle, the ISO Virtual Terminal model allows for multiple
classes of operation, although at the time of publication of this International Standardized Profile, only the Basic Class has been defined. The value of the identifier component a distinguishes between the permitted modes of operation of the Virtual Terminal Service as follows:
- a = 1 for A-mode (asynchronous mode) operation;
- a = 2 for S-mode (synchronous mode) operation.
Values of a greater than 2 are reserved for future developments.
This International Standardized Profile ISO/ISP 11187 contains
the specifications of the Profiles with identifiers of the form
AVT1b and AVT2b. The component b distinguishes between different Application Profiles that make use of the same mode of
This part of ISO/IEC ISP 11187 may be incorporated by reference into the Profile RL for any profile with an identifier of the form AVT1b or AVT2b.
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Information Technology - International Standardized Profiles
AVT1n, AVT2n - Virtual Terminal Basic Class - Application Profiles - Part 2: Common Supporting Layers Requirements (Adopted ISO/IEC ISP 11187-2:1996, first edition, 1996-09-01)