January 30, 2012
University of Phoenix
Technology is constantly changing in communications. The analog signal was used for several years and was limited in number and did not have the ability to handle the amount of data interchange used today, because of the size requirements. Analog signals are still used today, but are more complex and are in most circumstances converted to a digital signal. This paper will compare the different types of analog and digital technology we used and are currently using today.
Telecommunication: Analog/Digital Conversions
In the data communication world, there are two basic types of signals that are used in transmitting media: analog and digital. One form of data is captured is referred to as analog signal that can vary in amplitude (strength) and frequency (distance between wave-like peaks). The distance can be measure between the peaks in cycles per seconds, referred to as Hertz (Hz).
Additionally, with digital signals, there are two states: ‘off’ or ‘on’ that occur when there is a change in light levels. These signals are sent in a continuous flow and are measured in megahertz per second. This is similar in concept of the two hands of a clock that are constant in motion and represent time. 1 Both frequency and amplitude can be used to encode data.2
An example of analog to digital is the process of faxing. The user starts with a piece of paper (analog), and inserts it into a fax machine. The fax machine converts the text on the paper to a digital form. The modem in turn, converts it to analog. The Class 5 switch at the local exchange converts it to analog. At the other end, his friend via the receiving Class 4 switch converts it to digital. The Class 5 switch at the receiving end local exchange, converts it to analog. . The friend’s modem converts it to digital, and finally the receiving friend’s fax machine prints it out onto paper which is... [continues]
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