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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 17789-1999 |
Procedures for simultaneous transmission of data and digitally encoded voice signals over the PSTN or over 2-wire leased point-to-point telephone type circuits 在PSTN或二线点对点租用电话型电路上同时传送数据和数字化编码语音信号的规程 |
China National Standards Procedures simultaneous transmission |
 English PDF |
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