![]() ![]() ![]() However, this speedup is a tradeoff versus cost since multiple wires cost more than a single wire, and as a parallel cable gets longer, the synchronization timing between multiple channels becomes more sensitive to distance. As a result, there is a speedup in parallel transmission bit rate over serial transmission bit rate. Parallel devices have a wider data bus than serial devices and can therefore transfer data in words of one or more bytes at a time. In parallel transmission, multiple bits (usually 8 bits or a byte/character) are sent simultaneously on different channels (wires, frequency channels) within the same cable, or radio path, and synchronized to a clock. The type of transmission mode used may also depend upon distance and required data rate. Consequently, it is necessary to make a parallel-to-serial conversion at a computer interface when sending data from a computer system into a network and a serial-to-parallel conversion at a computer interface when receiving information from a network. Data between computer systems is usually transmitted in bit serial mode. ![]() With the width of the parallel bus matched to the word size of the computer system. Data within a computer system is transmitted via parallel mode on buses Digital data transmission can occur in two basic modes: serial or parallel. ![]()
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