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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 5444-1985 |
The test methods for the technical specifications of Subscriber line signalling for automatic telephone switching network 电话自动交换网用户信号技术指标测试方法 |
China National Standards Subscriber line signalling |
 English PDF |
| GB 3378-1982 |
Subscriber line signalling system for telephone automatic switching network 电话自动交换网用户信号方式 |
China National Standards Subscriber line signalling |
English PDF |
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