"Fibre channel" a 100 MB/Sec plus serial SCSI is being designed in parallel with Ultra-SCSI but is not part of the SCSI-3 effort per se.
SCSI-3 doubles the data transfer rate. The changes primarily affect the I/O subsystem, not disk drive internals and mechanics. One limitation of Ultra-SCSI is that cable length is limited to 1.5 meters -- a bit less than 5 feet. Where longer cables must be used, there is an option to use differential signals which supports 25 meter cables at substantially higher cost. The SCSI-3 standard also includes provisions for Bus Extenders which allow a 6 meter extension to the cable.
Return To Index Copyright 1994-2002 by Donald Kenney.