The CCITT considering a) that there is a need to check the answerback of the called telex number [e.g. delivery from a telex-Teletex conversion facility (CF)/ or store and forward unit (SFU)]; b) that Recommendation F.60 defines a preferred structure for the telex answerback; c) that different forms of answerback exist; d) that Recommendation F.74 defines a structure for an answerback associated with an intermediate storage device.
ITU-T U.75 SPANISH-1993由国际电信联盟 IX-ITU 发布于 1993-03-01。
ITU-T U.75 SPANISH-1993 在中国标准分类中归属于: M39 传真电报设备。
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