GB/T 7557-1987 1.2/4.4mm标准同轴电缆300路载波系统进网特性要求

标准编号：GB/T 7557-1987

标准名称：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