General characteristics complying with the network performance objectives for 300 channel carrier telephone systems on standardized 1.2/4.4mm coaxial cable pairs
基本信息
标准号:
GB/T 7557-1987
名称:
1.2/4.4mm标准同轴电缆300路载波系统进网特性要求
英文名称:
General characteristics complying with the network performance objectives for 300 channel carrier telephone systems on standardized 1.2/4.4mm coaxial cable pairs