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.