China 'YD/T 521-1992
' standard english version summary:
YD
中华人民共和国行业标准
INDUSTRY STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
YD/T 521-1992
Test method of digital exchange analog interfaces and test method of transmission characteristics between (2-wire or 4-wire) analog interfaces 数字交换机模拟接口测试方法及模拟接口(二线或四线)间传输特性的测试方法
Issued Date:
Implemented Date:
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The Standardization Administration of the People's Republic of China
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"YD/T 521-1992" standard !
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Test method of digital exchange analog interfaces and test method of transmission characteristics between (2-wire or 4-wire) analog interfaces
GB Standard Chinese Title
数字交换机模拟接口测试方法及模拟接口(二线或四线)间传输特性的测试方法
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