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普通市内电话是地道的有线电话，属于有线电通信的范畴，因为每台电话机始终有一对电话线栓着。 无绳电话虽然是有线电通信与无线电通信结缘的产物，但只是局部无线化。即将手机与座机之间的连接绳线改用靠无线电波维系，而座机仍然要受到电话线的束缚。 “大哥大”是典型的无
Ordinary local calls are authentic landline telephones and fall into the category of wireline telecommunications because there is always a pair of phone lines tied to each phone. Although cordless phones are the product of the close relationship between wireline and radio communications, they are only partially wireless. Is about to use mobile phones and landline connection cable to rely on the maintenance of radio waves, while the plane is still subject to the shackles of the phone line. “Big Brother” is typical of nothing