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• CCITT Rec. U.201(11/1988) – INTERWORKING BETWEEN THE TELETEX SERVICE AND THE TELEX SERVICE
• 1 Introduction
• 2 Basic interworking service
  • 2.1 Types of interworking
  • 2.2 Methods of interworking
• 3 Telex access to a conversion facility (CF)
  • 3.1 One-stage selection
  • 3.2 Two-stage selection
• 4 Delivery procedure to Teletex from a CF
  • 4.1 Service principles
  • 4.2 Text delivery
• ANNEX A – Reactions to abnormal conditions during the telex input
• A.1 Telex connection clearing without the end of input signal
• A.2 Telex subscriber pausing during input of address information
• A.3 Telex subscriber stopping transmission without sending the end of input signal
• A.4 Telex subscriber sending a WRU to the conversion facility during text input
• A.5 Telex subscriber sending a text after the end of input signal
• A.6 Telex subscriber clearing after the end of input signal and before the input message acknowledgement signal
• A.7 Telex subscriber sending national variants of ITA2 characters (figure shift characters of F, G and H)
• A.8 The conversion facility detecting signal distorsion during text input
• A.9 Telex subscriber sending a bell signal
• A.10 CFs storage capacity overflow during telex message input
• A.11 Request of optional facilities, when not provided by the CF