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[GF 008.8-1994] 电信网维护技术指标体系（第八卷）光纤通信和PCM复用、数字复用设备维护技术指标[已废止]
发布时间：1994-01-01
实施时间：1994-12-01
主题内容：它规定了光纤数字线路系统、数字有线链路（通道）、数字四线音频电路、PCM复用设备、光端机、..
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[GB/T 11591-1989] 公用数据网中的分组装/拆设施[已作废]
发布时间：1989-08-01
实施时间：1989-08-01
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[GB/T 7554-1987] 电报用五单位数字保护码[现行]
发布时间：1987-03-26
实施时间：1987-01-01
本标准适用于我国国内公众电报通信和其它通信。本标准规定58个字符(包括控制字符)以及这些字符的五单位..
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发布时间：1982-01-01
实施时间：1982-01-01
本标准主要适用于检查一、二类真迹传真设备的性能及其传输质量。根据接收机复制出的各个图型的失真程度，可..
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