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Why are some FireWire cables 4-pin and others 6-pin?

April 26, 2017cables FireWire

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Why are some FireWire cables 4-pin and others 6-pin?

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The 6-pin cable carries data and draws power from the FireWire bus. The 4-pin cable is used to carry data only, it does not draw power from the FireWire bus, most often seen in self-powered devices like digital video cameras.