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.
SCSI 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.
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