The data will be exported one by one bit. Between the sending and receiving of data transmission is slower than parallel. Serial data transfer for intermediary needs a single communication line or just a single pair. The cost is cheaper in parallel for the transmission, the distance to the distance, especially when we have a telephone communication system to be used and will be saving more than that will make the individual 8-channel communications for parallel data transfer. Serial data transfer is initiated by the data from the point, the signal will be turned into serial first and then gradually one bit to the point, and that point is there must be a mechanism to change the information that is sent one by one bit. As parallel signals which fits like a 1 bit data bus lines down as shown in Figure 1.
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