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