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Number of entries (Data is updated on a monthly basis): 47268
GB/T 6879-1995
2048kbit/s 30路脉码调制复用设备技术要求和测试方法
Performance andtest methods of the 30 channels pulse code modulation multiplex equipment at 2048 kbit/s
GB/T 5443-1985
The test methods for the technical specifications of ringing and tone for automatic telephone switchingnetwork
Number of entries (Data is updated on a monthly basis): 47268