LL：Leased line，专线指示。此讯号显示调制解调器连线型态。此灯亮起，表示调制解调器是通过（）连线。..

第1题

[] What is the difference between a CSU/DSU and a modem?（）

A、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、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、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、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

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第2题

[单选题] 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.

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第3题

[单选题] 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.