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This data cable type sends data only one bit at a time, however the sending speed is extremely high. What type of cable is this?

A Serial.

Data could either be transmitted parallelly, which means multiple bits are transmitted at the same time; or they can be transmitted serially which means a single bit is transmitted at a time. Strange as it may seems, serial transmission offer a better sending speed. In fact, modern peripheral and hard drive cables all send data in series.

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