Introduction to Data Communications
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14. Physical Connection

The physical connection determines how many bits (1's or 0's) can be transmitted at a single instance of time. If only 1 bit of information can be transmitted over the data transmission medium at a time then it is considered a Serial Communication.

If more than 1 bit of information is transmitted over the data transmission medium at a time then it is considered a Parallel Communication.

Communications Advantages Disadvantages
Parallel Fast Transfer Rates Short distances only
Serial Long Distances Slow transfer rates

Introduction to Data Communications
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