Data transmission also data communication or digital communications is the transfer of data a digital bitstream or a digitized analog signal. over a point-to-point or point-to-multipoint communication channel. Examples of such channels are copper wires, optical fibers, wireless communication channels, storage media and computer buses.
The Network Voice Protocol was a pioneering computer network protocol for transporting human speech over packetized communications networks. It was an early example of Voice over Internet Protocol technology.