CAN/CSA-ISO/IEC-7498-1-95 (R2013)
The international community has decided to make this standard available only in
the English language version. It has been adopted as a National Standard of
Canada on this basis.
This National Standard of Canada is equivalent to International Standard
ISO/IEC 7498-1:1994.
1. Scope
1.1 The purpose of this Reference Model of Open Systems Interconnection is to
provide a common basis for the coordination of standards development for the
purpose of systems interconnection, while allowing existing standards to be
placed into perspective within the overall Reference Model.
1.2 The term Open Systems Interconnection (OSI) qualifies standards for the
exchange of information among systems that are "open" to one another for this
purpose by virtue of their mutual use of the applicable standards.
1.3 The fact that a system is open does not imply any particular systems
implementation, technology or means of interconnection, but refers to the
mutual recognition and support of the applicable standards.
1.4 It is also the purpose of this Reference Model to identify areas for
developing or improving standards, and to provide a common reference for
maintaining consistency of all related standards. It is not the intent of this
Reference Model either to serve as an implementation specification, or to be a
basis for appraising the conformance of actual implementations, or to provide a
sufficient level of detail to define precisely the services and protocols of
the interconnection architecture. Rather, this Reference Model provides a
conceptual and functional framework which allows international teams of experts
to work productively and independently on the development of standards for each
layer of the Reference Model for OSI.
1.5 The Reference Model has sufficient flexibility to accommodate advances in
technology and expansion in user demands. This flexibility is also intended to
allow the phased transition from existing implementations to OSI standards.
1.6 While the scope of the general architectural principles required for OSI is
very broad, this Reference Model is primarily concerned with systems comprising
terminals, computers, and associated devices and the means for transferring
information between such systems. Other aspects of OSI requiring attention are
described briefly (see 4.2).
1.7 The description of the Basic Reference Model of OSI is developed in stages:
1.8 Clause 4 establishes the reasons for Open Systems Interconnection, defines
what is being connected, the scope of the interconnection, and describes the
modelling principles used in OSI.
1.9 Clause 5 describes the general nature of the architecture of the Reference
Model; namely that it is layered, what layering means, and the principles used
to describe layers.
1.10 Clause 6 names, and introduces the specific layers of the architecture,
and
1.11 Clause 7 provides the description of the specific layers.
1.12 Clause 8 provides the description of Management Aspects of OSI.
1.13 Clause 9 specifies compliance and consistency with the OSI Reference
Model.
1.14 An indication of how the layers were chosen is given in Annex A to this
Basic Reference Model.
1.15 Additional aspects of this Reference Model beyond the basic aspects are
described in several parts. The first part describes the Basic Reference
Model. The second part describes the architectire for OSI Security. The third
part describes OSI Naming and Addressing. The fourth describes OSI System
Management.
1.16 The Basic Reference Model serves as a framework for the definition of
services and protocols which fit within the boundaries established by the
Reference Model.
1.17 In those few cases where a feature is explicitly marked (optional) in the
Basic Reference Model it should remain optional in the corresponding service or
protocol (even if at a given instant the two cases of the option are not yet
documented).
1.18 This Reference Model does not specify services and protocols for OSI. It
is neither an implementation specification for systems, nor a basis for
appraising the conformance of impl
OEN:
CSA
Langue:
English
Code(s) de l'ICS:
35.100
Statut:
Norme
Date de Publication:
1995-05-30
Numéro Standard:
CAN/CSA-ISO/IEC-7498-1-95 (R2013)