What is the difference between a CSU/DSU and a modem?
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.
【正确答案】
D
【答案解析】
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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