Penguin
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FireWire is the consumer name for the IEEE1394 protocol. Sony call it i.Link.

It is a serial bus protocol, with a capacity of up to 400Mbps, or 800Mbps in the IEEE1394-b standard (known as !FireWire800). FireWire can support up to 63 chained devices.

FireWire is typically used for digital video systems (DV) to connect the camera to a computer. It's high speed allows rapid download of DV to a host system. It's also used for external harddisks, scanners, and can be used to connect two computers together.