Ultra SCSI – Terms & Terminology

Ultra SCSI

Data transfers 20 megabytes per second, first defined in Fast-20, below defines how it is used in the different generations of the SCSI standards. The different entries in the table are for the number of devices supported with the cable length.

SCSI Fast-20 (SCSI Parallel Interface)

8 bit SCSI asynchronous commands with Synchronous data transfer rates up to 20 megabytes per second. CMOS technology with active negation single ended bus transceivers, active termination, and Differential (Now called HVD – High Voltage differential) bus transceivers based on EIA 485 allowed in SCSI Fast-20.

CSI SPI-2 (SCSI Parallel Interface)

8 bit SCSI asynchronous commands with Synchronous data transfer rates up to 20 megabytes per second. CMOS technology with active negation single ended bus transceivers, active termination, LVD (Low Voltage Differential) and Differential (HVD – High Voltage differential) bus transceivers based on EIA 485 allowed in SCSI SPI-2.