Summary

This Recommendation defines the rules applicable to the international interworking between videotex services. Two classes of interworking are specified:

–           interworking between gateways (see Recommendations T.504, T.523, T.541 and T.564);

–           interworking between a terminal and a host (X.29 based protocols).

Moreover the different Data Syntaxes are defined in the following annexes:

–           Interworking Data Syntax (Annex A);

–           Data Syntax I (CAPTAIN) (Annex B);

–           Data Syntax II (former CEPT data syntax) (Annex C);

–           Data Syntax III (NAPLPS) (Annex D).

In addition, common extensions to the various data syntaxes are defined:

–           Audio Data Syntax (Annex E);

–           Photographic Data Syntax (Annex F),

as well as the ISO 9281 based switching mechanism between all syntaxes.

–           Annex A – Interworking Data Syntax (IDS);

–           Annex B – Data Syntax I (CAPTAIN);

–           Annex C – Data Syntax II (former CEPT data syntax);

–           Annex D – Data Syntax III (NAPLPS);

–           Annex E – Audio Data Syntax;

–           Annex F – Photographic Data Syntax.