It is conceivable that future exchange system would not only voice transmission system, but included a voice,text,picture high broadband transmission systems, and household word.

• 可以想象,今后的交换机系统,将不仅仅是语音传输系统,而是一个包含声音、文字、图像的高比特宽带传输系统,并深入千家万户。