CONTENTS

1 Scope
2 References
3 Definitions
4 Operational requirements
5 Connecting in text telephone mode including procedures for interworking with the installed base of existing text telephones
5.1 Automoding originating
5.2 Automoding answering
5.3 Automoding monitor mode
6 Multi-mode text telephony
6.1 Simultaneous Voice and Text telephony (SVT)
Annex A 5-bit operational mode
A.1 Mode of operation
A.2 Modulation
A.3 Probe
A.4 Character conversion
Annex B DTMF operational mode
B.1 Mode of operation
B.2 Character conversion
Annex C EDT operational mode
C.1 Mode of operation
C.2 Modulation
C.3 Characters in the EDT mode
Annex D Bell 103 mode
D.1 Mode of operation
D.2 Modulation
Annex E V.23 Videotex terminals
E.1 Minitel terminals
E.1.1 Mode of operation
E.1.2 Minitel "Dialogue" terminal
E.1.3 Minitel "Normal" terminal
E.2 Prestel terminals
Annex F V.21 text telephone mode
F.1 Mode of operation
F.2 Modulation
F.3 Channel selection
F.4 Character code and framing
F.5 Presentation control
F.6 Usage conventions
Annex G V.18 text telephone mode
G.1 Mode of operation
G.2 Presentation protocol for V.18 mode
G.3 Framing and transmission
Appendix I Representative ordering of automoding
Appendix II Recommended common procedures for terminals using the V.18 DCE
II.1 Line status display
II.2 Connect mode
Appendix III Connection procedures for terminals including V.18 functionality
III.1 V.18 connection procedures without V.8 bis
III.2 V.8 bis connection procedures