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A parallel cable carries multiple signals while a co-axial cable typically carries a single signal, but that signal can be modulated to carry more than one channel of information.

A parallel cable typically carried 8, 16 or even 32 data lines as well as clock and control lines.

In the early days of computing parallel interfaces could transfer whole bytes or words simultaneously, so they were frequently faster than the equivalent serial interfaces which were available at that time. Early PCs, data storage devices and digital television equipment made use of high speed parallel connections to offer fast data rates whilst requiring a lot less processing power compared to serial connections.

In recent years, local and wide area networking - using wireless links and telephone based connections - have seen major developments in serial interfacing technology to increase overall data throughput, so that today's serial cables and interfaces are much faster than most parallel cable solutions. Furthermore parallel solutions are not compatible with the serial format of wireless and wired Ethernet, so offer little benefit compared to using either co-ax or twisted pair serial cables.

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