| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| YDN 030.1-1997 | English | 1879 |
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Implications and process of universal personal telecommunication, wide area Centrex switch (WAC), vote of telephone (VOT) and mass calling (MAS) services (internal standard)
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YDN 030.1-1997
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YDN 030.1-1997
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