| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD/T 990-1998 | English | 639 |
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Days<=5
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Technical condition for specific optical transmission equipment between exchanger and remote module
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YD/T 990-1998
| Obsolete |
YD/T 990-1998
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