GB/T 5442-1985
China national
standard english version:
GB
中华人民共和国国家标准
NATIONAL
STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
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
Issued Date:1985-10-30
Implemented Date:1986-06-01
Issued by:
The Standardization Administration of the People's Republic of China