6-pin to 6-pin firewire cable. Firewire is also referred to as IEEE-1394 and is capable of high speed data transfers up to 400Mpbs!
The length limitation of Firewire is about 15 feet.
6-pin firewire connectors include the ability to carry power on two of the six pins but 4-pin connectors cannot (so 4-pin devices must be self powering and cannot draw power from a 6-pin device).