China Inband pulsing singl GB Standards Search Result |
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GB/T 5442-1985 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 - 英文版 |
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GB 3376-1982 Inband pulsing single frequencyline signalling 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 - 英文版 |
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