Fibre Channel Protocol (FCP) is a transport protocol (similar to TCP used in IP networks) which predominantly transports SCSI commands over Fibre Channel networks.[1][2]

via Fibre Channel – Wikipedia, the free encyclopedia.

Despite its name, Fibre Channel signaling can run on both twisted paircopperwire and fiber-opticcables.^[1][2]

I still need to know how this is done over fibre.