使用零调制解调器连接时，发送线和接收线要交叉连接。
With a null modem connection, the transmit and receive lines are cross-linked.
与其他的USB调制解调器不同，250U集成了天线以获得更好的接收效果。
Unlike most other USB modems, the 250U has jacks to connect an external antenna for better reception.
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。
The modem of the receiving computer demodulates the analog sound signal back into a digital form that the computer can understand.
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