The Power Mac G4 computer includes two external FireWire IEEE 1394a ports on the rear panel of the enclosure and one inside the computer. The FireWire ports
support serial I/O at 100, 200, and 400 Mbps (megabits per second)
provide 15 watts of power when the computer system is on
accept external power input on the bus when the computer is off
The FireWire hardware and software provided with the Power Mac G4 computer are capable of all asynchronous and isochronous transfers defined by IEEE standard 1394a. Developers of FireWire peripherals are required to provide device drivers.
It is possible to connect two computers to each other using a FireWire cable, but no software is provided to make use of such a connection.