The CCITT, considering Recommendations F.60 [4] and F.21 [5] concerning the telex and gentex services respectively; that start-stop equipment is capable of receiving communications without the help of an operator; that this advantage is useful to users of the international Telegraph Alphabet No.2 (ITA2).
ITU-T S.6 SPANISH-1988 Referenced Document
ITU-T F.130 MARITIME ANSWER - BACK CODES*, 1993-01-01 Update
ITU-T F.60 Operational Provisions for the International Telex Service (Study Group I) 34 pp*, 1992-01-01 Update