Firewire Repeater 400 The Firewire Repeater 400 works by repeating the Firewire signal and doubling the distance of any Firewire 400 cable. Enables Firewire devices to be placed far from the computer for those who prefer to work in a quiet, non-intrusive environment. When daisy-chained every 33 feet between cables, Firewire Repeaters can extend FireWire 400 up to 250 feet away from sources.