IEEE 1394 firewire cable includes two independent shielded twisted lines which achieve bi-directional transmission signal and reception and the two power wires (8V ~ 40V, 1.5A) and a shield line. Compared to the provided 6 wire cable of IEEE 1394 firewire cable a, or as to the format for the 6-pin fireWire, Sony has developed a power supply model of 4-wire which is known as the 4-pin fireWire format. IEEE 1394 firewirecable is mainly used for connecting audio and video equipment. The 4-pin firewire format is defined as 1394.1, sometimes referred to as i.link. Without the use of repeater cases, the length between two firewire cable devices come up to 4.5m which is to be called a jump distance, IEEE 1394 firewire cable can come up to 16 at most. So the distance between devices can be expand to 72m in the case of using a standard cable.
IEEE 1394 firewire cable standard also defines three data rates, respectively 98.304Mbs, 196.608Mbs, 393.216Mbs, and often used by their approximate numerical value: 100Mbs, 200Mbs, 400Mbs known as the S100, S200 and S400 ( format of the proposed number 1394b rate of 800Mbs ~ 3.2Gbs at present).
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