In between two transmission of information must have a transmission channel, according to the different transmission media, cable and wireless data communications data communications breakdown.
要在两地间传输信息必须有传输信道，根据传输媒体的不同，有有线数据通信与无线数据通信之分。
In between two transmission of information must have a transmission channel, according to the different transmission media, cable and wireless data communications data communications breakdown.
要在两地间传输信息必须有传输信道，根据传输媒体的不同，有有线数据通信与无线数据通信之分。
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