| 1. | Digital line signalling for intertoll exchange
长途电话交换局间数字型线路信号 |
| 2. | Subscriber line signaling system for telephone automatic switching network
电话自动交换网用户信号方式 |
| 3. | Digital line signalling for manual toll exchange to local exchange
人工长途电话局至市话局局间中继数字型线路信号 |
| 4. | Lead - out line signal
引出线信号 |
| 5. | Interoffice junction digital line signalling system for telephone automatic switching network
电话自动交换网局间中继数字型线路信号方式 |
| 6. | Inband pulsing single frequency line signaling system for telephone automatic switching network
电话自动交换网带内单频脉冲线路信号方式 |
| 7. | 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 |
| 8. | The fsk is used in the modulation for audio signals and the data signals . and the fdm is used to merge three lines signals
频移键控用于音频和数据信号的调制，三路信号的混合采用了频分复用技术。 |
| 9. | The test methods for the technical specifications of inband pulsing single frequency line signalling system for automatic telephone switching network
电话自动交换网带内单频脉冲线路信号技术指标测试方法 |
