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What is the difference between a CSU/DSU and a modem?

admin2019-04-08  17
问题 What is the difference between a CSU/DSU and a modem?
选项 A、        A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line．
B、        A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line．
C、        A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line．
D、        A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line．
答案D
解析 csu/dsu和modem的不同点是什么？
考点分析：这道题考的是CSU/DSU和modem的基本作用。CSU/DSU是把数字信号从路由转换到租用线路上，modem是进行数模转换的设备。CSU/DSU一般是专线，MODEN是将模拟信号与数字信号转换。
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