| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YD 523-1992 | English | 199 |
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Days<=2
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Technical requirement for interface equipment of (6+2) 64kbit/S data multiplex
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YD 523-1992
| Obsolete |
YD 523-1992
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