Use on public data networks of data terminal equipment (DTE)which is designed for interfacing to synchronous V-series MODEMs
IDT ITU-T X.21bis:1988
中国通信标准化协会
本标准规定了数据电路与V系列调制解调器的数据终端设备互连时的操作方法和可选的性能要求。
本标准适用于V系列调制解调器同步接口设备的选型与设计。
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