1 Scope1
2 Normative references1
3 Overall structure of protocols in
various environments2
3.1 Data Syntaxes Applicable to
Videotex Terminals3
3.2 ISDN circuit mode3
3.3 ISDN packet mode3
3.4 PSTN packet mode3
4 Syntax-based Videotex Application
layer protocol3
5 Existing protocols of SPTN
circuit switched mode3