Exchange of Information Regarding Signals Destined to Be Used over International Circuits Concerned with Switched Teleprinter Networks - Telegraph Switching (Study Group IX) 1 pp
国外标准现行
标准号:ITU-T U.4-1989
标准名称: 关于在电传机交换网的国际电路上使用信号的信息交换-电报交换.第IX研究组.第1页
英文名称:Exchange of Information Regarding Signals Destined to Be Used over International Circuits Concerned with Switched Teleprinter Networks - Telegraph Switching (Study Group IX) 1 pp