(292417)JDSU 863x高密度E1卡用120欧姆平衡缆，接头为RJ48/RJ45，当被测设备是75欧姆接口(国内的 DDF架，一般都配置75ohm接口)时，须加装()。阻抗匹配器。(1.0分)
A.75/100ohm
B.75/110ohm
C.75/120ohm
D.75/130ohm
正确答案是C
(292417)JDSU 863x高密度E1卡用120欧姆平衡缆，接头为RJ48/RJ45，当被测设备是75欧姆接口(国内的 DDF架，一般都配置75ohm接口)时，须加装()。阻抗匹配器。(1.0分)
A.75/100ohm
B.75/110ohm
C.75/120ohm
D.75/130ohm
正确答案是C