1
Introduction
2
Basic interworking service
2.1 General
2.2 Access methods for interworking
3
Telex-to-Videotex direction
3.1 One-stage selection
3.2 Two-stage selection
4
Interworking in the Videotex-to-telex direction
4.1 Delivery procedure to telex from a one-stage Telex/Videotex
Conversion Facility (VTXCF)
4.2 Delivery procedure to telex from a two stage Telex/Videotex
conversion facility (VTXCF)
4.3 Notifications to
the Videotex user
Annex A – Reactions to abnormal
conditions during text input from telex
A.1 The telex subscriber pauses during input of address
information (applicable for two-stage access only)
A.2 The telex subscriber pauses during or before input of his
message
A.3 The telex subscriber sends a WRU signal to the VTXCF during
text input
A.4 The telex subscriber sends text after an End Of Transaction
(EOT) signal (applicable for two-stage access only)
A.5 The telex subscriber clears after an End Of Transaction (EOT)
signal before he receives the Input
Message Acknowledgement (IMA) signal
(applicable for two-stage access only)
A.6 The telex subscriber sends combinations 6, 7 or 8 in figure
case
A.7 The telex subscriber sends combination 10 in figure case
(“BELL”)
A.8 Storage capacity overflow in the VTXCF