Firewire is also known as I-link or IEEE1394 and is high speed (400Mbps). Almost standard on all Digital Video Cameras and offers a standardised easy to use plug and play method of connecting peripherals to your PC. Slightly slower than USBv2 (480Mbps) but often more reliable which comes from the internationally recognised standard (IEEE). IEEE1394b is available which is twice as fast (800Mbps). The 4 connector on Firewire is the small connector 4 to 4 usually connects the DV-out on a video camera to most laptops with built in Firewire and some DVD recorders and other video editing devices. It can also be used for connecting Playstation 2 s together or to a PS2 hub.