单选题csu/dsu和modem的不同点是什么（）A一个CSU/ DSU转换成模拟信号，从路由器到租用线路；一个调制解调器从一个路由器到一个租用线路转换的模拟信号。B一个CSU/ DSU转换成模拟信号，从路由器到电话线；一个调制解调器从一个路由器到一个租用线路将数字信号转换。C一个CSU/ DSU转换从路由器到电话线的数字信号；一个调制解调器从一个路由器到一个电话线路转换的模拟信号。D一个CSU/ DSU转换从路由器到租用线路的数字信号；一个调制解调器从一个路由器到一个电话线路将数字信号转换。
单选题
csu/dsu和modem的不同点是什么（）
A
一个CSU/ DSU转换成模拟信号，从路由器到租用线路；一个调制解调器从一个路由器到一个租用线路转换的模拟信号。
B
一个CSU/ DSU转换成模拟信号，从路由器到电话线；一个调制解调器从一个路由器到一个租用线路将数字信号转换。
C
一个CSU/ DSU转换从路由器到电话线的数字信号；一个调制解调器从一个路由器到一个电话线路转换的模拟信号。
D
一个CSU/ DSU转换从路由器到租用线路的数字信号；一个调制解调器从一个路由器到一个电话线路将数字信号转换。
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