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INTERNATIONAL TELECOMMUNICATION UNION
ITU-T RECOMMENDATION SUMMARY
Rec. No. : X.290
Title : OSI conformance testing methodology and framework for protocol
recommendations for CCITT applications -general concepts
Study Group : VII - Data Communications Networks
Version : Revised
Date of adoption : 1992
Notes : Also published as ISO/IEC 9646-1: 1991
The objective of OSI will not be completely achieved until systems can
be tested to determine whether they conform to the relevant protocol
specification(s). The relevant ones can be OSI CCITT Recommendations
or International Standards.
Standardized abstract test suites should be developed for each CCITT
Recommendation or International Standard which specifies an OSI
protocol, for use by suppliers or implementors in self-testing, by
users of OSI products, by telecommunications Administrations and
recognized private operating agencies, or by other third party
testing organizations. This should lead to comparability and wide
acceptance of test results produced by different test laboratories,
and thereby minimize the need for repeated conformance testing of the
same system.
The standardization of test suites requires international definition
and acceptance of a common testing methodology, together with
appropriate testing methods and procedures. It is the purpose of
Recommendations X.290 to X.294 to define the methodology, to provide
a framework for specifying conformance test suites, and to define
the procedures to be followed during testing.
Conformance testing involves testing both the capabilities and
behaviour of an implementation, and checking what is observed against
both the conformance requirements in the relevant CCITT
Recommendations or International Standards and what the implementor
states the implementationÆs capabilities are.
The purpose of conformance testing is to increase the probability that
different OSI implementations are able to interwork. However it should
be borne in mind that the complexity of most protocols makes
exhaustive testing impractical on both technical and economic grounds.
Also, testing cannot guarantee conformance to a specification since it
detects errors rather than their absence. Thus conformance to a test
suite alone cannot guarantee interworking. What it does do is give
confidence that an implementation has the required capabilities and
that its behaviour conforms consistently in representative instances
of communication.
To order the complete text of this Recommendation, please use the
Order Form for ITU-T Recommendations. An electronic version of this
form is available on ITUDOC (Winword 2.0: UPI=ITU-5265; ASCII: UPI=ITU-2488).