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the DSU converts the binary data pulses it receives from the DTE to the line encoding format required by the network, withing the computer the one bits are positive voltages, and zero bits are not voltages or low level voltages.
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Any method of electrical or electronic digital communication.
I would define data communication as the transfer of information between two points, either via an analogue (sine wave) electrical signal. or digital (binary ) signal via electrical pulses or optically via light pulses
Andrew Marc Weiner has written: 'Ultrafast optics' -- subject(s): Industrial applications, Laser pulses, Ultrashort, Mode-locked lasers, Nonlinear optical spectroscopy, Nonlinear optics, Ultrashort Laser pulses
Different types of information are transmitted from one place to another by signals of light pulses through optical fibers.
Optical fibers transmit signals over long distances by a process called total internal reflection. In this process, optical fibers bend light by bouncing pulses of light along their inner walls, which enables the pulses of light to travel quickly over long distances. For more information, refer to the related link below.
To the naked eye - usually not much. To an oscilloscope (and some gadgets) it'll look like a series of pulses. To the appropriate equipment, those pulses can be anything. TV, music, a voice conversation, financial transactions.
Taximeters are an electronic piece of equipment that counts the pulses coming from a sensor on the transmission. The signal from the transmission is in the form of a pulse which the meter counts and then determines how far the vehicle has traveled.
We usually use some form of coherent light wave in fiber optic conduits to move data. That means a laser and the emission of light somewhere at or about optical wavelengths.
S. Mukamel has written: 'Principles of nonlinear optical spectroscopy' -- subject(s): Spectrum analysis, Density matrices, Picosecond pulses, Nonlinear optics