1 Scope
This CCITT Recommendation | International Standard is applicable to the environments where the X.25 packet layer protocol, as standardized in (PLP) ISO/IEC 8208, is operated over a telephone network connection to provide the OSI Connection-mode Network Service (CONS). These environments include
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a) telephone network leased circuit connection between two DTEs;
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b) telephone network switched connection between two DTEs;
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c) DTE access to a PSDN via a telephone network leased circuit connection; and
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d) DTE access to a PSDN via a telephone network switched connection.
This provision is achieved by specifying the mapping of the CONS primitives and parameters to and from the elements of the protocols used.