中国人民共和国国家标准 GB/T17801-1999 eqv ITU-TX.32:1996 经公用交换电话网或综合业务数字网或电路交换公用数据网接入分组数据网的分组是数据终端设备（DTE)和数据电路终接设备（DCE）之间的接口

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