If you have an analog modem, you can use it to connect to the referral service to establish service.
如果有模拟调制解调器，则可以通过该调制解调器连接到参考服务，以建立服务。
The modem of the receiving computer demodulates the analog sound signal back into a digital form that the computer can understand.
接收端的计算机的调制解调器将模拟语音信号解调还原为计算机能理解的数字形式。
Modem enables the mutual conversion of analog signals and digital signals. Dial up connection is impossible without medom.
调制解调器是实现模拟信号和数字信号互相转变的设备，通过它用户的电脑才可连接因特网。
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