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YD-5076-98
- 国家邮电部程控交换标准之--程控电话交换设备安装工程设计规定YD 5076-98-Ministry of Posts program - control standards -- program - controlled telephone switching equipment installation engineering design requirements YD 5076-98
YD-5006-2003
- 国家邮电部程控交换标准之--本地电话网用户线路工程设计规范YD 5006-2003 -Ministry of Posts program - control standards -- the local telephone network subscriber line engineering design specifications YD 5006-2003