YDN 121-1999
Technical specifications for SDH network synchronous state information (internal standard) (English Version)
- Standard No.
- YDN 121-1999
- Language
- Chinese, Available in English version
- Release Date
- 1999
- Published By
- Professional Standard - Post and Telecommunication
- Latest
- YDN 121-1999
YDN 121-1999 history
- 1999 YDN 121-1999 Technical specifications for SDH network synchronous state information (internal standard)
