PRETS 300 218-1992 Integrated Services Digital Network (ISDN); Syntax-Based Videotex Lower Layers Protocols for ISDN Packet Mode (CCITT Recommendation X.31 Case A and Case B)
ETSI - European Telecommunications Standards Institute
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PRETS 300 218-1992
Scope
This ETS specifies the usage of all protocols and supplementary services up to and including layer 3 for Syntax-based Videotex (SBV) terminal equipment in the Integrated Services Digital Network (ISDN). The scope of this ETS is limited to virtual circuits using the three different DTE/DCE modes of connection@ i.e.: a) the DTE/DCE connection to Public Switched Packet Data Network (PSPDN) services (CCITT Recommendation X.31 [4]@ Case A); b) the ISDN virtual circuit service through the B-channel (CCITT Recommendation X.31 [4]@ Case B); c) the ISDN virtual circuit service through the D-channel (CCITT Recommendation X.31 [4]@ Case B). This ETS is applicable to terminal equipment supporting the Syntax-based Videotex using either basic access or primary rate access to the ISDN. In this context@ a terminal equipment is either a Videotex Terminal@ a Videotex Service Centre@ a Videotex Access Point or a Videotex Host (cf. subclause 3.1). This ETS is based on other ETSs@ International Standards or CCITT Recommendations and@ where necessary@ it adds new or other requirements as application rules. Conformance testing will be specified by reference to the individual Protocol Implementation Conformance Statement (PICS) proformas and the Abstract Test Suites (ATS).
PRETS 300 218-1992 history
1992PRETS 300 218-1992 Integrated Services Digital Network (ISDN); Syntax-Based Videotex Lower Layers Protocols for ISDN Packet Mode (CCITT Recommendation X.31 Case A and Case B)