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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| YDN 034.4-1997 |
ISDN subscribers - specification for network interfaces. Part 4 Technical specifications for supplementary services (internal standard) isdn用户--网络接口规范 第4部分:补充业务技术规范 |
China Telecommunication
Standards ISDN subscribers specification |
 English PDF |
| YDN 034.3-1997 |
ISDN subscribers - specification for network interfaces Part 3: Technical specifications for third-layer basic call control (internal standard) isdn用户--网络接口规范 第3部分:第三层基本呼叫控制技术规范 |
China Telecommunication
Standards ISDN subscribers specification |
English PDF |
| YDN 034.2-1997 |
ISDN subscribers - specification for network interfaces Part 2: Technical specifications for data link layers (internal standard) isdn用户--网络接口规范 第2部分:数据链路层技术规范 |
China Telecommunication
Standards ISDN subscribers specification |
English PDF |
| YDN 034.1-1997 |
ISDN subscribers - specification for network interfaces Part 1: Technical specification for physical layers isdn用户?网络接口规范 第1部分：物理层技术规范 |
China Telecommunication
Standards ISDN subscribers specification |
English PDF |
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