MODEM(俗称“猫”)即调制解调器,有外置和内置两种基本类型。内置式MODEM是一块单独的、直接插入PC扩展槽内的电路板,由扩展总线提供电源,价格比较便宜,并且不占用空间。外置MODEM有单独电源,并且有一排指示用LED灯,通过观察这些红绿灯,可以迅速判断通信的进程或通信出错的原因。内置猫 MODEM (commonly known as “cat”) that is modems, there are two basic types of external and built-in. The built-in MODEM is a single, directly inserted circuit board in a PC expansion slot, powered by an expansion bus, which is cheaper and does not consume space. External MODEM has a separate power supply, and a row of instructions with LED lights, by observing these traffic lights, you can quickly determine the communication process or communication error reasons. Built-in cat