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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| YD/T 727-1994 |
Electrical characteristics for unbalanced double-current interchange circuits 非平衡双流接口电路的电特性 |
China Telecommunication
Standards Electrical characteristics unbalanced |
 English PDF |
| TB 2179.4-1991 |
(Railway telephone network data communication interface. In the field of data communications usually Electrical characteristics for unbalanced double interface integrated circuit devices used in conjunction with) |
China Railway & Train
Standards Electrical characteristics unbalanced |
English PDF |
| TB 2179.3-1991 |
(Railway telephone network data communication interface. Electrical characteristics for unbalanced double interface circuit) |
China Railway & Train
Standards Electrical characteristics unbalanced |
English PDF |
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