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[TZ 010-1988] 大、中、小城市数、模混合电信网技术体[废止]
发布时间：1988-01-01
实施时间：2003-05-01
主题内容：规定了电话自动交换网中引入数字设备后的相关要求。适用范围：主要用于本地网，但又能与长途网相..
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[GB 7437-1987] 公用模拟长途电话自动交换网传输性能指标[已作废]
发布时间：1987-03-16
实施时间：1987-11-01
本标准是公用模拟长途电话自动交换网的传输性能指标。它规定了在全国范围内任何两个本地端局用户之间的最低..
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[GB 7283-1987] 城市公共交通通信系统GB7283-87[已作废]
发布时间：1987-01-26
实施时间：1987-11-01
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