零调制解调器电缆是一种允许在两个串行端口之间发送数据的串行电缆。
A null modem cable is a serial cable that allows data to be sent between two serial ports.
GPRS设备类似于拥有扩展AT命令集的调制解调器，在进入数据模式之前必须使用AT命令定义一个上下文。
A GPRS device, which resembles a modem with an extended at command set, must define a context using an at command before it enters data mode.
智能网上，明确地指定了服务用于语音，所有其他数据类型需要专线接入，或者烦人的调制解调器。
The Intelligent Network is tightly specified for voice. All other data types require special leased access lines, or awful kludges like modems.
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