The transmission speed can reach up to 400 Mbps at maximum length of 90 meters (~ 300 ft).
CAT5 Repeater-400? is using the new TSB41BA3B 1394b PHY from Texas Instruments and EqCologic 1394b to UTP cabling equalizer. It is optimized to create long-haul IEEE 1394b-2002 connections over CAT-5 or CAT-6 at the S400 data rate, but it can also be used at S200 and S100.

Specifications:
• Two 1394a (Firewire 400) 6 pin ports operating at 100/200/400 Megabits per Second (Mbits/s)
• One UTP RJ45 port.
• DC Power connector.
• Full Duplex Data Rate at 100/200/400 Mbps.