Chinese Standard: GB/T 11589-2011

International user classes of service in,and categories of access to,public data networks and integrated services digital networks(ISDNs)

IDT  ITU-T X.1:2000

中国通信标准化协会

许多国家为数据传输而建立的公用网和为综合业务而建立的综合业务数字网,需要制定用户业务类别和接入种类的标准。

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