TB 1474-1983 铁路长途电话人工交换设备制式系列.pdf

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GB 11055-1989 长途电话全自动对端设备技术要求和测试方法.pdf

YD 335-1988 长途电话交换局间数字型线路信号.pdf

GB T 7437-1987 公用模拟长途电话自动交换网传输性能指标.pdf

GB T 11055-1989 长途电话全自动对端设备技术要求和测试方法.pdf

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ITU-T G 169-1999 Automatic Level Control Devices《自动电平控制装置 G系列 传输系统媒介 数字系统和网络 国际电话连接和电路 长途电话电路相关设备》.pdf

GOST R 53725-2009 Quality of service Long-distance telephone communication Quality indices《服务质量 长途电话通讯 质量指标》.pdf

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