调制解调器功能不正常，或连接已断开。

Modem is not functioning or line has been dropped.

youdao

一种对信号进行调制与解调的功能部件，调制解调器的功能之一就是使数字数据经由模拟传输设施进行传送。

A functional unit that modulates and demodulates signals. One of the functions of a modem is to enable digital data to be transmitted over analog transmission facilities.

youdao

文中提出了一种CD MA调制解调器射频电路和数字基带处理电路框图，分析了它们的组成及工作过程，设计了扩展功能用的系统连接器。

A new design of RF block diagram, digital baseband block diagram of CDMA modem, the form and working-process are analysised, in order to expand function, a system connector is designed.

youdao