ITU-T T.390-1989 Teletex Requirements for Interworking with the Telex Service - Terminal Equipment and Protocols for Telematic Services (Study Group VIII) 15 pp
Recommendation F.200 lays down the provisions for the operation of the automatic international Teletex service. In particular, Recommendation E200 defines the basic service requirements and principles for interworking between Teletex and telex services vi
ITU-T T.390-1989 history
1989ITU-T T.390-1989 Teletex Requirements for Interworking with the Telex Service - Terminal Equipment and Protocols for Telematic Services (Study Group VIII) 15 pp