| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD 5021-1996 | English | 2059 |
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Provisional Standards of SDH Engineering Design for Long-Distance Optical Fibre Cable Transmission Project
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YD 5021-1996
| Obsolete |
YD 5021-1996
|