Modems and Dialers
Over the last two decades there has been a dramatic increase in the amount of data transmitted between computers and remote terminals. Although in some cases digital channels are specially constructed to carry data, it is generally much simpler and more economical to use the existing telephone plant. The “telco” is familiar and reliable, and connects the vast majority of locations where computers and terminals might be located. Consequently, both the volume and the percentage of digital telecommunications traffic is steadily increasing and will soon overshadow the voice traffic. This is one of the main reasons that telephone companies worldwide are converting to digital transmission as fast as is economically feasible.
KeywordsFederal Communication Commission Quadrature Amplitude Modulation Gray Code Telephone Line Differential Phase
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