China National Standards

China SDB Industry Standards English PDF List

  •  China "SDB" Industry Standards English PDF List:
    • Standard  Code Standard Title Standard Class Order
    YD/T 2020-2009 Technical requirement for subscriber database (SDB) of PSTN
    公用交换电话网（pstn）网络用户数据库设备技术要求    		 China Telecommunication Standards
    SDB
    English PDF

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