There are two versions of the FireWire interface in use ? the first or original version of FireWire, sometimes referred to as FireWire 400 (or IEEE 1394a) and FireWire 800..

http://www.engineersedge.com/computer_technology/firewire_cables.htm

USB Cables / Interface Overview - USB Cables / Interface overview - USB 2.0, occasionally referred to as Hi-Speed USB, is the next generation Universal Serial Bus interface technology (used in computer and consumer electronics industries and applications) that allows for the connection ..

http://www.engineersedge.com/computer_technology/usb_cables.htm