Interface between data terminal equipment(DTE) and data circuit-terminating equipment(DCE) for start-stop transmission services on public data networks
IDT ITU-T X.20:1988
中国通信标准化协会
本标准规定了在ITU-T X.1中定义的使用起/止传输用户业务类别的DTE和DCE间的通用接口的物理特性和呼叫控制过程，包括选择、呼叫进行和DCE提供的信息的格式和规程，包含有双向操作的条款。
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