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电话自动交换网铃流和信号音技术指标测试方法
The test methods for the technical specifications of ringing and tone for automatic telephone switching network
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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
The test methods for the technical specifications of inband pulsing single frequency line signalling system for automatic telephone switching network
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电信网中脉冲编码调制音频通路传输特性常用测试方法
General test method for transmission performance of PCM voice channel in telecommunication network
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长途通信网频分制系统频率比较导频系列
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模拟通信网中实际电路噪声与模拟系统负荷的电路噪声测试方法
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模拟通信网中相对功率电平的测试方法
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电话自动交换网多频记发器信号技术指标测试方法
The test methods for the technical specifications of multi-frequency register signaling for telephone automatic switching network
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ISDN用户-网络接口第三层基本呼叫控制技术规范及测试方法 第2部分;第三层基本呼叫控制协议测试方法
ISDN user-network interface layer 3 specification and testing method for basic call control procedure. Part 2: Testing method for layer 3 basic call control protocol
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ISDN用户-网络接口第三层基本呼叫控制技术规范及测试方法 第1部分;第三层基本呼叫控制技术规范
ISDN user-network interface layer 3 specification and testing method for basic call control. Part 1: Layer 3 specification for basic call control
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电信线路磁感应纵电动势和对地电压,电感应电流及杂音计电压的测量方法
Measuring methods of the magnetic induced longitudinal EMF,magnetic induced voltage with respect to earth,electric induced current and psophometric voltage on telecommunication lines
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