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Keyword:
| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| YD/T 928-1997 |
Technical specification for ISDN PABXs n-isdn第二类网络终端（nt2型）设备isdn用户交换机技术规范 |
China Telecommunication
Standards PABXs |
 English PDF |
| YD 344-1990 |
Requirements for PABXs access to public telephone switching network 自动用户交换机进网要求 |
China Telecommunication
Standards PABXs |
English PDF |
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