Voici quelques suggestions qui pourraient vous intéresser;
The Gefen Firewire Repeater 400 works by repeating the Firewire signal and doubling the distance of any Firewire 400 cable. It enables Firewire devices to be placed far from the computer for those who prefer to work in a quiet, non-intrusive environment. The Firewire Repeater 400 is placed at the end of each 33 foot Firewire 400 cable, you can use any combination of Firewire extension cables to extend up to 250 feet.
Extends Firewire devices up to 250 feet (76 meters) by daisy chainingTransfer rates of 100/200/400 MbpsCompliant with IEEE 1394.aCompact sizeShielded plastic caseWorks with Apple and PC computersFirewire powered off of 6 pin busInstalls in minutes
Data rates: S100(122.44 Mbps), S200(245.76 Mbps), S400(491.52 Mbps)Dimensions: 2.25"D x 0.75"H x 2.2"DShipping Weight: 1 lb.External Power Supply: 12-30V*