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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 7625-1987 |
2400/1200 bits per second modem standardized for use in the general switched telephone network 在电话自动交换网上使用的标准化 2400/1200比特/秒调制解调器 |
China National Standards 1200 bits per |
 English PDF |
| GB/T 7621-1987 |
1200 bits per second duplex modem standardized for use in the general switched telephone network and on point-to-point 2-wire leased telephonecircuits 在电话自动交换网和点对点二线租用电话型电路上使用的标准化的1200比特/秒双工调制解调器 |
China National Standards 1200 bits per |
English PDF |
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