China 'GB/T 13137-1991
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 13137-1991
Specification for 12-channel telephone carrier terminal equipment used on the symmetric pains of 2.6/9.5 mm coaxial cable 2.6/9.5 mm综合中同轴电缆高频四芯组或高频线对12路载波电话终端设备技术条件
Issued Date:1991-08-15
Implemented Date:1992-04-01
Issued by:
The Standardization Administration of the People's Republic of China